Posts Tagged EM

Current Issue of “Exploration Geophysics” – Airborne Electromagnetics AEM 2013

Posted by on Monday, 30 March, 2015

Exploration Geophysics
Volume 46 Number 1 2015
6th International Conference in Airborne Electromagnetics (AEM 2013)

This special issue of Exploration Geophysics comprises papers from the 6th International Conference in Airborne Electromagnetics (AEM 2013) held in South Africa, and showcases the latest ideas and advancements in the discipline of airborne electromagnetic geophysics.

Developing an efficient modelling and data presentation strategy for ATDEM system comparison and survey design
blank image
Magdel Combrinck
pp. 3-11

A proposal to simplify the display of ATDEM responses through the concept of a three-dimensional signal:noise nomo-volume is presented. It contains the signal:noise values of all system time channels and components for various target depths and conductances integrated into a single interactive three-dimensional image.

3D-spectral CDIs: a fast alternative to 3D inversion?
blank image
James Macnae
pp. 12-18

Spectral 3D approximations of the EM response can efficiently model vortex induction and current gathering for simple geological target geometries. This paper presents results of a spectral model fitting algorithm to automatically pick, locate and define a sulphide target from VTEM data at the Forrestania test range, Western Australia.

The analysis of ZTEM data across the Humble magnetic anomaly, Alaska
blank image
Daniel Sattel and Ken Witherly
pp. 19-26

ZTEM data acquired across a magnetic anomaly of almost 30 000 nT were analysed for the presence of a magnetic gradient response and the effects from elevated magnetic susceptibilities. Modelling results indicate distortions in the conductivity structure recovered by 3D inversion when elevated magnetic susceptibility values are ignored during the inversion.

Regional TEMPEST survey in north-east Namibia
blank image
Geoffrey Peters , Gregory Street , Ivor Kahimise and David Hutchins
pp. 27-35

A regional scale low-cost TEMPEST208 survey in north-east Namibia has provided a geo-electric map of the area, including an indication of Kalahari cover thickness. While there are limitations in terms of detail and depth penetration, the results will assist explorers in selecting areas of shallow cover to reduce costs.

Helicopter EM (ZTEM–VTEM) survey results over the Nuqrah copper–lead–zinc–gold SEDEX massive sulphide deposit in the Western Arabian Shield, Kingdom of Saudi Arabia
blank image
Jean M. Legault , Carlos Izarra , Alexander Prikhodko , Shengkai Zhao and Emad M. Saadawi
pp. 36-48

Magnetic and electromagnetic (EM) results from both time-domain (VTEM and AFMAG (ZTEM) helicopter EM surveys are compared over the Nuqrah sedimentary exhalative (SEDEX) massive sulphide deposit in Saudi Arabia. The magnetic and EM data map major controlling structures but only the EM surveys are able to define the Nuqrah deposits.

MULTIPULSE – high resolution and high power in one TDEM system
blank image
Tianyou Chen , Greg Hodges and Philip Miles
pp. 49-57

The MULTIPULSE technology airborne TEM system transmits a high power pulse and low power pulse(s) (trapezoid or square) within a half-cycle. The high power pulse ensures good depth of exploration and the low power pulse allows higher near-surface resolution and better sensitivity to weak conductors as confirmed by field results.

Geobandwidth: comparing time domain electromagnetic waveforms with a wire loop model
blank image
Greg Hodges and Tianyou Chen
pp. 58-63

The effect of time domain EM waveform, power and receiver sampling times are effectively compared for a wide range of time constants using a wire loop conductor model. Peak time constant and equivalent frequency can be determined analytically or numerically. Arbitrary waveforms can be modelled as a sum of simple short ramps.

Not extinct yet: innovations in frequency domain HEM triggered by sea ice studies
blank image
Andreas A. Pfaffhuber and Stefan Hendricks
pp. 64-73

Operational use of frequency domain HEM for sea ice thickness mapping was the driving force for developing new purpose-designed systems. We present improvements in decreasing noise levels by one to two orders of magnitude, and implemented control signals to eliminate system drift. Ground tests and airborne field data confirmed the achievement of these goals.

Airborne electromagnetic modelling options and their consequences in target definition
blank image
Alan Yusen Ley-Cooper , Andrea Viezzoli , Julien Guillemoteau , Giulio Vignoli , James Macnae , Leif Cox and Tim Munday
pp. 74-84

Given the range of geological conditions under which airborne EM surveys are conducted, there is an expectation that 2D and 3D methods used to extract models of geological significance would be favoured over 1D inversion and transforms. We analyse data from the Musgrave province, South Australia, used for mineral and for hydro-geological prospecting.

Modelling an arbitrarily oriented magnetic dipole over a homogeneous half-space for a rapid topographic correction of airborne EM data
blank image
Julien Guillemoteau , Pascal Sailhac and Mickael Behaegel
pp. 85-96

In mountainous areas, the airborne electromagnetic system can be at an angle with regard to the ground. We analyse how the data and the eddy current are affected in such a context. We also suggest a simple correction for the data and for the sensitivity function that reduces topography effects.

New developments in AEM discrete conductor modelling and inversion
blank image
Marc A. Vallée
pp. 97-111

In the last 20 years, sphere and plate models have been integrated in parametric inversion programs which are used today for interactive interpretation of airborne electromagnetic surveys on powerful workstations. Different problems encountered in the implementation and application of these models are discussed and a case history from Abitibi, Canada, is presented.

Rapid approximate inversion of airborne TEM
blank image
Peter K. Fullagar , Glenn A. Pears , James E. Reid and Ralf Schaa
pp. 112-117

Two algorithms have been developed to perform rapid approximate 3D inversion of airborne TEM. VPem1D performs 1D inversion at each data location above a 3D model. Interpretation of cover thickness is a natural application. VPem3D performs 3D inversion of resistive limit data. Conversion to resistive limits delivers a massive increase in speed. Both programs can operate on geological models to foster integrated interpretation.

Modelling the superparamagnetic response of AEM data
blank image
Daniel Sattel and Paul Mutton
pp. 118-129

VTEM data flown at different system elevations across a known sulphide body and surface cover with elevated superparamagnetic (SPM) properties were analysed. The results indicate that SPM responses can be distinguished from deep conductor responses if the vertical AEM gradient is measured, with EM sensors being offset vertically by 2–40 m.

Using the in-line component for fixed-wing EM 1D inversion
blank image
Adam Smiarowski
pp. 130-135

In conductive areas, the in-line component of an offset transmitter–receiver EM system can be more sensitive to the near-surface than the vertical component. Using estimated noise levels, this paper calculates the expected uncertainty on the inverted parameters of a bathymetry model and compares this to inversion results from field data.

Extending the range of time constants recorded by the SPECTREM AEM system
blank image
Peter B. Leggatt
pp. 136-139

The Spectrem AEM transmitter has no off-time; secondary signals are recorded at the same time as the transmitter primary. By assuming the secondaries have decayed away by the last window, the signal value is used as an estimate of the primary. The result is underestimation of the secondary amplitudes if the target is highly conductive. This paper describes a method to compute a better estimate of the primary amplitude.

Drilling Results of Anomalous Radioactivity and Conductors (Athabasca basin)

Posted by on Thursday, 25 September, 2014

 FISSION URANIUM CORP. announces the results of 21 of its 22 regional drill hole program at its PLS (Patterson Lake South) property in Canada’s Athabasca Basin. Four new holes have discovered anomalous radioactivity on three new conductors in the PL Corridor and Far East target areas of PLS. This follows exploration hole, PLS14-255 (see NR August 11, 2014), also drilled on the Far East target area, which hit radioactivity 17km from the main PLS discovery where high-grade mineralization has been outlined along a 2.24km strike length. The remaining 17 regional holes encountered encouraging geological features but did not intersect significant radioactivity.

Another Three Holes Encounter Anomalous Results on Far East of PLS Property

  • Significant anomalous radioactivity intersected by:
    • Hole PLS14-260 (104A EM conductor)
    • Holes PLS14-262 and PLS14-284 (105A EM conductor)
  • PLS14-262 and PLS14-284 are approximately 14m and 25m respectively from hole PLS14-255 (105A EM Conductor), which recently intersected anomalous radioactivity of up to 2532 cps.
  • Holes are located near the Fission 3.0/Brades Clearwater West project, approximately 17km south east of the main PLS discovery

One Exploration Hole Hits on PL Corridor of PLS Property

  • Anomalous radioactivity intersected by:
    • Hole PLS14-252 (1B EM Conductor) has intersected anomalous radioactivity on the PL Corridor,
  • Hole is located approximately 750m east from the main discovery

Ross McElroy, President, COO, and Chief Geologist for Fission, commented,

“The regional exploration program has been a great success and we have three very clear target areas prioritized for aggressive follow up: The PL Corridor, the Far East where we recently hit anomalous radioactivity in hole PLS14-255 and the Forrest Lake Areas. With over 105 separate conductors, we have felt for some time that the prospectively of PLS goes beyond the incredible discovery we have already made. These regional drill results confirm that belief.”


PLS is one of the most exciting uranium discoveries made to date in Canada’s prolific Athabasca Basin, which hosts the richest producing uranium mines in the world. The discovery is driven by a highly skilled technical team and successful entrepreneurial management. After a series of corporate transactions, Fission Uranium consolidated 100% ownership of the PLS Property, which comprises 17 claims totaling 31,039 ha located on the southwest margin of the Athabasca Basin. The property is accessible by all-weather Highway 955 which continues north through the area of the UEX-AREVA Shea Creek discoveries to the past producing Cluff Lake uranium mine.

The PLS discovery is a basement hosted unconformity uranium deposit, characterized by shallow, high-grade mineralization in five separate zones trending for approximately 2.24 km in length. From west to east, these zones are; R600W, R00E, R780E, R1155E and R1620E. Up to and including the drilling from the winter 2014 program, 163 delineation holes have defined mineralization over a strike length of 1155m in the R00E and R780E zones, with 158 holes intersecting mineralization, for a 97% success hit ratio. Mineralization has exhibited high grades over exceptionally wide thicknesses, which remain wide open.


A set of geophysics for Iron Oxide Copper Gold deposit in Quebec

Posted by on Thursday, 17 July, 2014

Honey Badger Exploration Inc.  has completed the interpretation of the geophysical data over the Delhi Pacific copper showing on its Sagar Property. The coincident gravity, magnetic, electromagnetic (“EM”) and induced polarization (“IP”) anomaly associated with the Delhi showing are typical of those expected from an Iron Oxide Copper Gold (“IOCG”) deposit.

The IOCG model is further supported by the presence of a favourable structural setting for an IOCG deposit, namely the abundance of polymetallic showings (copper-gold-silver-cobalt) and the presence of diagnostically verified IOCG hydrothermal alteration.

At the Delhi Pacific showing, historical significant drilling intersections include 45.81 metres @ 0.51% copper and 10.7 metres @ 0.78% copper. While these intersections were not tested for silver, gold or cobalt, historic and recent grab samples* contain up to 1.8 grams per ton (“g/t”) gold, and up to 35 g/t silver.

*Grab samples are selective by nature and are unlikely to represent average grades of the deposit(s).

The selection of new drill targets is based on an interpretation of the IP/Resistivity, airborne magnetics, ground gravity and airborne EM data. In the winter of 2014 ClearView Geophysics Inc. completed a Surface Spectral IP survey over part of and extending east of the Delhi Pacific showing (Figure 1).

To view ‘Figure 1 – Surface Spectral Induced Polarization survey location lines’, please visit the following link:

The interpretation indicates an anomaly associated with the historic drilling at Delhi that increases both in intensity and size east of these drill holes for more than 1.5 kilometres. The apparent resistivity data is presented in Figure 2 (red-purple indicates low resistivity and represents the target area):

Figure 2 – Resistivity Data at Delhi Pacific

The gravity data indicates that the southwest side of the magnetic high zone at Delhi Pacific coincides with a gravity low feature, whereas to the north is a gravity high. This indicates that the resistivity low/chargeability/electromagnetic target is located along a major structure that represents a favourable event for IOCG mineralization. The target area at Delhi covers more than 3 square kilometres: approximately 1.5 kilometres in strike length multiplied by an average width of 200 metres (Figure 3).

‘Figure 4 – Magnetic Inversion over Delhi Pacific’

Linking Porphyry Deposit Geology to Geophysics via Physical Properties

Posted by on Tuesday, 7 January, 2014

Geoscience BC Releases the Report:

Linking Porphyry Deposit Geology to Geophysics via Physical Properties: Adding Value to Geoscience BC Geophysical Data
by Dianne Mitchinson, MDRU; R.J. Enkin, GSC; and C.J.R. Hart, MDRU.

Regional geophysical surveys were flown in 2007 and 2008 as part of the QUEST and QUEST-West projects to improve geological understanding in Quaternary sediment-covered areas and thereby encourage mineral exploration. As part of the ongoing process of adding value to Geoscience BC datasets, Project 2009-001, “Integrated Geological & Geophysical Porphyry Models: Adding Value to Geoscience BC Geophysical Data (NTS 93E, 93K, 93L, 93M, 93N)” was undertaken to define relationships between geophysical datasets collected as part of these QUEST surveys and porphyry deposit geology at six known porphyry deposits. The deposits chosen for investigation include: Mount Milligan, Endako, Huckleberry, Bell, Granisle and Morrison. 
Geoscience BC Report 2013-14 presents physical rock property data from the six above-listed BC porphyry deposits, and discusses observed trends within the detailed QUEST and QUEST-West geophysical datasets and mapped geology. The resulting physical rock property data compilation has implications for improving interpretations of geophysical data from porphyry deposits. A synopsis of physical property criteria defining hydrothermally altered or mineralized rocks in BC porphyry settings is provided, which can ultimately be used for ranking similar mineral exploration targets throughout BC, thereby minimizing exploration risk.













Porphyry deposits surveyed during the QUEST and QUEST-West projects include Mount Milligan, Endako, Huckleberry, Bell, Granisle, and Morrison. Airborne magnetic and electromagnetic surveys (VTEM or AeroTEM) were conducted over each of these deposits. Additionally, a ZTEM (Z-axis tipper electromagnetic) survey was completed over the Mount Milligan deposit as a joint initiative between Geoscience BC and Terrane Metals Corp.

2009 : AeroTem Survey Results from the Equity Silver Mine
- Mineral Exploration Roundup Poster (pdf, 3.96MB)

Technical Article: 2009: “QUEST-West Geophysics in Central British Columbia (NTS 093E, F, G, K, L, M, N, 103I): New Regional Gravity and Helicopter-Borne Time-Domain Electromagnetic Data”
- Summary of Activities 2008, Report 2009-1 p.1-6 (pdf, 4.64MB)






Geophysical Surveys



Technical Article: 2007 : “Airborne electromagnetics and airborne gravity in the QUEST Project area, Williams Lake to Mackenzie, British Columbia (parts of NTS 093A, B, G, H, J, K, N, O; 094C, D)”
- Summary of Activities 2007, Report 2008-1 p.1-6 (pdf, 6.81MB)

Suggested Reference: Mitchinson, D.E., Enkin, R.J., and Hart, C.J.R. (2013): Linking Porphyry Deposit Geology to Geophysics via Physical Properties: Adding Value to Geoscience BC Geophysical Data; Geoscience BC, Report 2013-14, 116 p.

Report Components

Several EM Conductors Confirmed at Mulloy Graphite Project, Ontario

Posted by on Tuesday, 17 December, 2013

CARIBOU KING RESOURCES LTD. reports that several significant electromagnetic (EM) conductors have been confirmed on its Mulloy graphite project, located roughly ten kilometers west of the Zenyatta Ventures Ltd. Albany graphite project in Ontario. Four electromagnetic (EM) conductors are confirmed, three of which have a strike length over 700 meters, with the fourth striking over 600 meters in length, and all conductors remain open along strike. Each of the conductors corresponds in part with magnetic lows that are believed to indicate graphite mineralization, and one conductor is supported in part by historical drilling that encountered several intervals of graphite mineralization as described in detail below.

Michael England, CEO & Director states, “Our Mulloy property continues to demonstrate a great potential for significant graphite mineralization. Just as we expected from our earlier reconnaissance geophysics, the EM conductors are much larger than initially indicated, with a good correlation between conductivity and non-magnetic character expected for graphite mineralization. Our drill permits are expected shortly, we have a drill ready, and most importantly, we have road access directly to our drill targets.”

A total of seventeen line-kilometers of geophysics were completed at a line spacing of 100 meters, and both horizontal loop electromagnetic (HLEM) and magnetic data were collected. The survey focused on an area where reconnaissance HLEM and magnetics identified several anomalies that defined a possible northeast-southwest conductive trend (see news release, September 25, 2013). The new results confirm the previous data, extending four of the individual anomalies into southwest-striking linear conductors up to 800 meters in length that remain open along strike. The southernmost conductor ‘A’ is roughly 700 meters long, with an apparent broadening and narrowing that suggests a width of up to 100 meters along portions of the conductive zone. Conductors ‘B’ and ‘C’ are 630 and 885 meters long respectively, and both exhibit breaks along strike that may indicate offset by cross-structures. Anomaly ‘D’ is 875 meters long and exhibits broadening and narrowing up to 100 meters in width, as well as some offset along strike. Conductors C and D have significant strike lengths correlated with strong magnetic lows that are very likely due to graphite mineralization. Conductor B is near a historic drill hole that encountered 90% visual graphite in 18.68 meters of graphitic schist, followed by a second graphitic schist intersected over 19.78 meters for a total of 38.46 meters (Ontario Ministry of Northern Development and Mines, Report 42F15NE8019). An estimate of true thickness cannot be determined from the historic drilling, and the graphite content is a visual historical estimate and should not be relied upon without lab assay confirmation.

There are still several conductive anomalies identified in the original reconnaissance data to the southwest of the present survey that remain to be further delineated, and will be the focus of future ground-based surveys. The EM conductors from the present survey can be seen in plan view with magnetics on the company website at

Multiple EM Conductors Identified at Mulloy Graphite

Posted by on Thursday, 31 October, 2013

CARIBOU KING RESOURCES LTD. announces that ground-based electromagnetics (EM) has identified four significant conductors on its 100%-owned Mulloy graphite project, located ten kilometers west of the Zenyatta Ventures Ltd. Albany graphite project in Ontario. Measurements taken over 325 meters along a claim line identified four horizontal loop EM (HLEM) conductors that are near historic drilling that encountered 90% visual graphite in 18.68 meters of graphitic schist, followed by a second graphitic schist intersected over 19.78 meters for a total of 38.46 meters (see news release, August 15, 2013). Based on these positive results, permitting for line-cutting and drilling has been submitted and geophysics is presently underway to delineate the strike extent of the conductors, which will then be drill-tested.

Mulloy Graphite Maps:

Michael England, CEO and Director states, “The Mulloy graphite property hosts a historic drill hole with substantial graphite intersections that correspond with our recently-identified HLEM conductors. Our detailed work program is now underway and will include a drill program to test these high priority EM targets. This is a very active and exciting time for Caribou King as we explore all of our highly prospective graphite properties, several of which are in close proximity to historic or operating mines.”

The Mulloy Graphite Project (formerly the Pito claims, see news release, August 15, 2013) covers 1,536 hectares and is located 10 kilometers west of the Zenyatta Ventures Ltd. Albany graphite project that recently reported five drill holes including: 146m of 5.2% Cg, 177m of 5.3% Cg, 186m of 4.9% Cg, and 125m of 4.6% Cg, respectively (Zenyatta Ventures news, July 2, 2013). At Mulloy, a single north-directed hole drilled in the late 1970’s by Shell Canada Resources Ltd. intersected graphitic schist from 107.9-126.58 meters, with graphite forming 90% of the schist over the 18.68 meter interval. An additional 19.78 meters of graphitic schist from 130.28-150.0 meters contained several zones of soft graphite (Ontario Ministry of Northern Development and Mines, Report 42F15NE8019). An estimate of true thickness cannot be determined from the historic drilling, and the graphite content is a visual historical estimate and should not be relied upon without lab assay confirmation. The total depth of the drillhole was 182.70 meters.

The HLEM survey at Mulloy followed a north-south claim line located ten meters east of the historic drillhole collar, with stations spaced at 25 meters along a north-directed transect. Four HLEM conductors with coincident magnetic highs were detected over the 325 meter length and are believed to indicate additional graphitic zones in the metamorphic stratigraphy. Geophysical compilations available from government sources were also reviewed and show that the historic drillhole at Mulloy is positioned between a magnetic high and low, with a similar situation observed for the graphite breccia pipe presently being explored by Zenyatta Ventures at Albany (data from Maps of the Mulloy graphite project that includes historical magnetic data can be viewed on the company website at

Airborne Geophysics on Auden Graphite Property

Posted by on Thursday, 3 October, 2013

GTA Resources and Mining Inc. announces that it has commenced an airborne EM (Electro-Magnetics) and Magnetics survey on the Auden Project located adjacent to Zenyatta’s Albany graphite project in Northern Ontario. GTA is the largest land holder in this emerging graphite district with a total of 1748 claim units (approximately 28,000 hectares). Several conductive zone targets had previously been identified on its central claims from an earlier airborne survey flown in 2008. The new airborne survey will be composed of an east block and a west block which will complete the EM and magnetic coverage on the entire claim holdings.

The Auden Property is located adjacent to the south of the Albany Property of Zenyatta Ventures Ltd. who recently discovered vein-type graphite (hydrothermal) mineralization while testing electromagnetic (EM) targets. The mineralization has been described as occurring in breccia pipes (diatremes) having dimensions in the order of 200 m by 400 m. ( The deposits are further described as containing the largest and only high purity “hydrothermal” graphite mineralization being developed in the world. GTA has owned the Auden claims since 2010 and is the single largest land holder in the area. Furthermore, GTA’s management and geological consultants believe that the graphite breccia pipes that exist on Zenyatta’s Albany project are similar to kimberlite pipes (diatremes) and are likely to occur in clusters along structural corridors. Future exploration on the GTA claims will focus on identifying similar targets.

GTA owns a 100% interest in the Auden claims. An interpretation of the previously flown central claim block (EM and Magnetic) survey has identified 12 priority targets for follow-up. All of these targets are highly conductive and could be due to the presence of graphite (graphite has highly conducive properties). None of these conductive targets have been previously drill tested. It is anticipated that the new airborne survey will generate additional new targets for evaluation. GTA have been negotiating an exploration agreement with the “Constance Lake First Nation” prior to carrying out a follow-up program of ground geophysics and drilling, in respect of which GTA has submitted an application for a work permit from the Ministry of Northern Development and Mines.

New Exploration Potential at Aurea Norte, Guerrero, Mexico

Posted by on Monday, 23 September, 2013

Newstrike Capital Inc. reports that a recently completed ZTEM airborne geophysical survey flown over the Company’s Aurea Norte property has successfully identified several high priority anomalies on a parallel trend with its flagship gold deposit at Ana Paula. The survey covered an area known as the San Luis Trend, an important structural corridor over ten kilometres in length that has returned anomalous assays from widespread near-surface gold mineralization.

“Preliminary ZTEM results have identified several ‘blind’ exploration targets that coincide with favourable GGB (“Guerrero Gold Belt”) style surface alteration in outcrop that includes iron oxide alteration, jasperoid breccia, silicified intrusion and skarn with associated anomalous gold values. The survey results will be used to focus exploratory drilling along this prospective trend. In addition, several new targets were identified outside this trend that will continue to be investigated as exploration advances,” said Gillian Kearvell, V.P Exploration.

A 5,000 metre exploratory drill program is expected to commence shortly that will complement the exploration activity at Aurea Norte over the past year.

Geotech Ltd of Aurora, Ontario, Canada was contracted to survey approximately 250 square kilometres encompassing 1,298 flight line kilometres flown at a line spacing of 200m. The ZTEM survey is recognized for its ability to map resistivity contrasts associated with the structure and alteration typically associated with porphyry-skarn deposits or with structurally controlled epithermal deposits. ZTEM is capable of penetrating to depths from one to two kilometres and is useful in identifying “blind” exploration targets (a buried target that does not outcrop at surface).

The objective of the Aurea Norte survey was to locate potentially buried intrusive bodies associated with the GGB mineralization model and to confirm controlling structures along the mineralized San Luis Trend. The new anomalies identified by the ZTEM survey include resistivity contrasts typical of buried silicified intrusions and with alteration commonly associated with porphyry-skarn and epithermal style deposits. See the company website for maps from this survey.

Exploration activities are currently focused on advancing the project pipeline around the Company’s flagship Ana Paula project, The Ana Paula project is located internal to and surrounded by the 59,587 hectare Aurea Norte property.

The Ana Paula project is host to a structurally controlled epithermal style gold deposit with a pit constrained resource* of 44.8 million tonnes that includes 2.25 million ounces of contained gold and 10.8 million ounces of contained silver in all categories at a weighted average grade of 1.56 grams per tonne gold and 7.5 grams per tonne silver (NI-43-101 technical report filed May 8th, 2013, available on the company website or at *(applying cutoff grade of 0.45 grams per tonne gold equivalent (AuEq) defined by the price, cost and recovery assumptions).

The mineralization at Ana Paula follows a north trending structural corridor that lies to the west of and is parallel to the San Luis Trend. The deposit at Ana Paula was included in the ZTEM survey area to provide a case study and model for ongoing exploration.

The GGB is an established gold mining district that hosts to skarn and epithermal gold deposits located in a mining friendly jurisdiction that offers ample infrastructure, including roads, power, water and ports of access.

Geophysics for kimberlites on Baffin Island

Posted by on Monday, 9 September, 2013

Peregrine Diamonds Ltd.  provides an update on activities at its 100 percent-owned Chidliak project , located on Baffin Island, 120 kilometres from Iqaluit, the capital of Nunavut, Canada. The Chidliak summer exploration program operated by De Beers Canada Inc. (“De Beers”) was completed on August 19. Highlights from this program include the discovery by De Beers of two new kimberlites and the discovery of a kimberlite dyke by government geologists. In addition, possible kimberlite float, which is undergoing final petrographic confirmation by De Beers, was found in numerous other locations.
The De Beers summer exploration program at Chidliak included the evaluation of priority geophysical anomalies by prospecting, orientation geophysical surveys, and bedrock and surficial mapping. During the course of the program, De Beers field teams discovered two new kimberlite occurrences and numerous occurrences of possible kimberlite float requiring additional work before being confirmed. The first confirmed discovery is a kimberlite dyke approximately one metre wide associated with a circular magnetic anomaly with an estimated surface expression from ground magnetics of approximately 0.5 hectares. At the second site, kimberlite float was found associated with a circular geophysical anomaly that has an estimated surface expression from airborne magnetics of approximately 0.5 hectares. Concurrent with the De Beers Chidliak exploration program, the Canada Nunavut Geoscience Office (“CNGO”) conducted a bedrock and surficial mapping program over a portion of the Hall Peninsula of Baffin Island. During the course of their fieldwork, the CNGO reported the discovery of a new kimberlite dyke on the Project. In total three new confirmed kimberlites have been discovered in 2013 bringing the total number of kimberlites at Chidliak to 64.

De Beers completed ground geophysical orientation surveys over twelve known kimberlites using the following methods: gravity, electromagnetics, ground penetrating radar and magnetics. The results from these surveys will be used to determine the most effective geophysical technique for discovering additional kimberlites in future exploration programs. To date initial results from the gravity surveys have been reviewed by Peregrine and indicate that most of the known kimberlites that were surveyed have a strong gravity response. Prior to this year, no gravity surveys had been executed on the Project. Peregrine believes that gravity could play a key role in future kimberlite discoveries at Chidliak. A complete summary of the summer exploration program, including confirmation of additional kimberlite discoveries, and results from the other geophysical surveys will be provided after all information from the program has been evaluated by Peregrine.

Magnetic survey in the Kivalliq and Baffin regions for kimberlites

Posted by on Tuesday, 3 September, 2013

North Arrow began exploring kimberlite trains on new properties acquired in the Kivalliq and Baffin regions using an airborne magnetic survey. Flown by contractor Tundra Airborne Surveys in Ontario, the Diamond DA-42 Twin Star is a state-of-the-art, composite aircraft outfitted with wing tip pods for the magnetometers and a nose stinger for a VLF-EM receiver.

photo courtesy of John Charlton

Airplanes and kimberlite trains

North Arrow looking for diamond indicators after acquiring new properties

Daron Letts
Northern News Services
Published Monday, August 12, 2013

North Arrow Minerals Inc. has had a plane in the air for the past several weeks near Chesterfield Inlet and Hall Beach in search of kimberlite trains.

The British Columbia-based junior exploration company acquired two kimberlite projects in the Baffin and Kivalliq regions last month as part of its new focus on hunting for Northern diamonds.

“The North is an area where there’s been a real history of successful diamond exploration in Canada and it’s a good place to be exploring,” said Ken Armstrong, North Arrow president and CEO. “With the general lack of diamond exploration activity – exploration activity in general, but diamond exploration activity, as well – we’re just looking to take advantage of the fact that there are public data sets and information out there that indicate there are unexplained targets and areas that we think are quite prospective in the North.”

North Arrow’s new properties include the Mel project, which consists of approximately 74,057 hectares on the Melville Peninsula, located 140 kilometres south of Hall Beach, and the Luxx project, which consists of approximately 40,468 hectares on tidewater 60 km from Chesterfield Inlet.

Unexplained kimberlite indicator mineral trains have been documented by past exploration activity in each region, according to public data filed with the federal government in accordance with the Nunavut and Northwest Territories Mining Regulations.

Stornoway Diamond Corporation filed results of work done in the Mel area as part of its Aviat project on the Melville Peninsula. Shear Minerals Ltd. filed results of work done in the Luxx area as part of a large exploration program in the region associated with its Churchill Diamond Project to the south.

“There could still very well be some undiscovered kimberlite in those localities,” Armstrong said. “So, it’s taking advantage of that public information to identify areas that we believe still are prospective for the discovery of new kimberlites and, ideally, diamondiferous kimberlites.”

Mel, which is 210 kilometres northeast of North Arrow’s Qilalugaq diamond project near Repulse Bay, is located within 10 km of tidewater and contains two kimberlite trains defined from more than 500 till samples recorded in Stornoway’s public assessment files, according to Armstrong. Luxx contains at least one kimberlite train, defined from more than 350 till samples in public assessment records filed by Shear, located within 20 km of the Churchill kimberlite cluster.

North Arrow began exploring both properties last month using an airborne magnetic survey, flown by contractor Tundra Airborne Surveys out of Ontario. The collection and preliminary analysis of the data should be complete soon, Armstrong said, adding the company will follow up with till sampling to confirm and better define the composition of kimberlite indicator minerals.

Success of two seasons of airborne and borehole TEM surveys in Greenland

Posted by on Wednesday, 28 August, 2013



North American Nickel Inc. has announced that diamond drill hole MQ-13-026 intersected an 18.62 metre core length of sulphide mineralization averaging approximately 40 – 45% total sulphides, including numerous sections containing 65% to 80% sulphides, within noritic host rocks at the Imiak Hill nickel-copper-cobalt zone on the Maniitsoq project.(see MQ-13-026 table). This is the deepest of three sulphide intersections, all described in this release, that have been drilled at Imiak Hill in 2013. Drill core has been logged, samples sawed in half and shipped to ALS Chemex in Sweden for analysis. Assay results for all three holes are pending and further drilling is planned.

Figure 1 is a high-resolution photograph that documents the entire 18.62 m long intersection in MQ-13-026, which includes inclusion-bearing near solid and solid sulphides

NAN COO, Neil Richardson, states: “We are pleased to report that drill hole MQ 13-026 is the best intersection we have seen to date with intense sulphides clearly present and our BHEM surveys indicate that Imiak Hill is still open down plunge. It is also important to note is that the intensity of the sulphide mineralization, as shown in the three holes referenced in this release, is increasing with depth. It is common knowledge that most nickel deposits occur at, or near the base of, mafic intrusions, so we will continue to follow the high grade mineralization down towards the base of the Imiak Hill mafic norite intrusion with additional drilling and borehole geophysics.”

Drill hole MQ-13-026 intersected near solid to solid sulphides with numerous sections containing 65-80% total sulphides. A description of the intersection is given in the table below:

MQ-13-026 Sulphide intersection

From (m) To (m) Length (m) Description
156.70 157.16 0.46 Norite, well mineralized, 25% sulphide
157.16 161.17 4.01 Norite, near solid sulphide, 75% sulphide
161.17 162.10 0.93 Norite, well mineralized, 20% sulphide
162.10 162.53 0.43 Norite, near solid sulphide, 75% sulphide
162.53 164.00 1.47 Norite
164.00 164.42 0.42 Norite, near solid sulphide, 85% sulphide
164.42 165.20 0.78 Norite, well mineralized, 30% sulphide
165.20 165.94 0.74 Norite, near solid sulphide, 85% sulphide
165.94 166.97 1.03 Norite, 2-3% sulphide
166.97 167.62 0.65 Norite, near solid sulphide, 70% sulphide
167.62 168.00 0.38 Norite
168.00 168.20 0.20 Norite, near solid sulphide, 70% sulphide
168.20 168.77 0.57 Norite, well mineralized, 40% sulphide
168.77 172.07 3.30 Norite, near solid sulphide, 75% sulphide
172.07 172.61 0.54 Norite
172.61 175.32 2.71 Norite, near solid sulphide, 70% sulphide

Note: the visual percent sulphide estimates and descriptions in this news release are not intended to suggest grades of contained metals, which will require assaying to determine. Mineral percentages are volume not weight.

The MQ-13-026 intersection occurs 142 to 159 m vertically below surface and is currently the deepest at Imiak, which suggests that the intensity of sulphide mineralization in the noritic host rock is increasing with depth. The hole was surveyed with a 3 component bore hole EM (BHEM) system and the mineralization produced an extremely strong “step response” type of anomaly. Interpretation by Crone Geophysics and Exploration Ltd.indicates that the mineralization continues down plunge.

North American Nickel has now delineated three, closely spaced, north-trending, near vertically dipping, steeply south-plunging mineralized zones at Imiak Hill. From east to west the zones have been provisionally named 10, 20 and 30 as shown on the attached plan map (Figure 2). The mineralization in MQ-13-026 correlates with Zone 30. A composite longitudinal section through Imiak Hill with all the intersections to date is included (Figure 3).

Sulphide textures, such as inclusion bearing massive and semi-massive sulphide, in MQ-13-026 are similar to those observed in the mineralized 2012 Imiak drill holes (MQ-12-001 and MQ-12-002); however, the volume percentage of sulphide in MQ-13-026 is significantly higher.

Drill hole MQ-13-024 intersected a 14.15 metre long interval of well mineralized to semi massive sulphides with an estimated average of 30-35% total sulphides approximately 36 metres up-plunge of MQ-13-026. This intersection also correlates with Zone 30. The hole was surveyed with a Crone 3D BHEM system and the resulting interpreted conductor plate fits well with Zone 30 as outlined from drilling.

MQ-13-024 Sulphide intersection

From (m) To (m) Length (m) Description
136.75 141.98 5.23 Norite, strongly mineralized 50% sulphide
141.98 145.61 3.63 Norite
145.61 146.53 0.92 Norite strongly mineralized 30-40% sulphide
146.53 148.15 1.62 Norite
148.15 150.90 2.75 Norite, strongly mineralized 50-60% sulphide
150.90 153.31 2.41 Norite 2-3% sulphide

Note: the visual percent sulphide estimates and descriptions in this news release are not intended to suggest grades of contained metals, which will require assaying to determine. Mineral percentages are volume not weight.

Drill hole MQ-13-019, located 30 metres up-plunge of MQ-13-024 and 66 metres up-plunge of MQ-13-026 intersected 10.75 metres of sulphide mineralization that also correlates with Zone 30. This mineralization is more disseminated in nature. The hole was surveyed with the Crone BHEM instrument and a late channel (strong) off-hole anomaly was detected below and south of the hole.

MQ-13-019 Sulphide intersection

From (m) To (m) Length (m) Description
118.09 118.93 0.84 Norite,10-15% sulphide
118.93 120.52 1.59 Norite, 20-25% sulphide
120.52 121.65 1.13 90% sulphide, 10% norite gangue
121.65 128.84 7.19 Norite, 5% sulphide in small massive bands

Note: the visual percent sulphide estimates and descriptions in this news release are not intended to suggest grades of contained metals, which will require assaying to determine. Mineral percentages are volume not weight.

To conclude, the mineralization at Imiak is open at depth and the geological team continues to develop a geological model that currently includes at least three zones of mineralization. The latest drilling indicates that the mineralization is strengthening with depth, producing late channel off-hole BHEM anomalies.

Since commencing the 2013 field program in late June, NAN has drilled 27 holes totaling 3037 meters at Maniitsoq. Drilling continues.

Collar coordinates for all of the Company’s drill holes at Imiak are listed in the table below.

Hole Number East (m) * North (m)* Elevation








MQ-12-001 477455 7257225 546 275 -45 106.07
MQ-12-002 477455 7257225 546 275 -70 173.12
MQ-12-003 477485 7257186 543 275 -73 292
MQ-12-004 477459 7257260 540 275 -45 95.4
MQ-13-019 477484 7257189 546 275 -55 176
MQ-13-020 477490 7257141 532 275 -62 209
MQ-13-023 477484 7257215 547 275 -59 188
MQ-13-024 477497 7257174 547 275 -59 197
MQ-13-025 477475 7257235 545 269 -45 122
MQ-13-026 477490 7257141 532 295 -65 215
*WGS84 UTM Zone 22N
Figures 1 to 3 are available at the following address:

Greenland and the Nickel Market

Posted by on Friday, 23 August, 2013

North American Nickel Talks Greenland and the Nickel Market

This week, Nickel Investing News (NIN) had the chance to speak with Neil Richardson, COO of VMS Ventures (TSXV:VMS) and North American Nickel (TSXV:NAN), a Canada-based mineral exploration and development company.

In the interview below, Richardson discusses recent developments at North American Nickel’s Greenland-based Maniitsoq project, including news from the company’s latest press release. He also touches on the company’s plans for its projects in Ontario and Manitoba and shares his thoughts on where nickel prices are headed in the short and long term.

Image courtesy of North American Nickel.

Maniitsoq 2013 field program

NIN: Can you start off by giving a quick rundown of the key things investors should know about North American Nickel?

Neil Richardson: North American Nickel is a junior exploration company focused on nickel and platinum-group elements (PGE) mineralization in North America, mainly in Sudbury, Canada, as well as the Thompson Nickel Belt area in Manitoba. We have completed some exploration work at those projects, but our main project, which is near the community of Maniitsoq in Greenland, is the focus of our current exploration work.

NIN: What is the relationship between North American Nickel and VMS Ventures?

NR: VMS owns a 27.5-percent interest in North American Nickel. North American Nickel was formed back a few years ago by spinning out the nickel assets that we had in VMS; the team that runs VMS is the same team that runs North American Nickel.

Along with our strategic partner, the Sentient Group, VMS holds a large percentage of the shares. Sentient has upped its share to 30 percent, so the two teams, VMS and Sentient, control over 57 percent of the corporation.

NIN: Earlier this month you acquired additional ground at Maniitsoq. How will that benefit the company?

NR: These exploration licenses were just granted recently by the Bureau of Mines and Petroleum, the BMP. We have the documentation in our office now for signing. That includes about 123 square kilometers of additional ground, putting the total up to 5,106 square kilometers of property.

Where we feel this is beneficial to us — we’re flying this ground as we speak — is that it adds more areas into our norite belt that we felt we were missing. Previous landowners in the area have lapsed their licenses and we have taken on about five different new licenses to complete our land package.

NIN: You also recently began drilling at Maniitsoq. What is the status of that program? I saw you put out an update today [July 30].

NR: Right now at Maniitsoq we’re on a two-week break. We were there for six weeks and completed the first phase of our two-phase program, 10 holes for just over 1,500 meters of drilling.

Today’s update is really on that first phase. During the first six-week phase at Maniitsoq we checked over 100 electromagnetic anomalies that we’ve assembled up over the last two years of flying over the belt. With this drilling, to date we’ve collected 567 core samples. We did an extensive channel sampling on some of these areas and submitted 249 channel and surface grab samples. All that data now has been submitted to ALS Chemex and I anticipate results coming back in five to six weeks.

During the two-week break we’re flying an additional 700 line-kilometers of Geotech versatile time domain EM survey (VTEM), our main EM system that we use over there and in our projects for VMS as well. We’ll be following up these targets as well in the second phase.

We’ll be starting the second phase on August 2 and going for another six or seven weeks, wrapping up the program with another 10 holes, or 1,500 to 1,600 meters of drilling.

Image courtesy of North American Nickel.Maniitsoq 2013 field program.

NIN: How have you found Greenland as an operating environment?

NR: Good. The Greenland government is very open to exploration companies. The BMP has guidelines and all you do is follow those guidelines. We have a very good rapport with a company called Xploration Services Greenland ApS. They take care of all our logistical requirements over there, so camp set up and everything like that, organizing sample shipments, is through them as well. They’re a very good exploration logistics company and they make sure we follow the guidelines that BMP stipulates.

Just like Canada, as long as you follow the rules and regulations, you’ll be fine. We’ve done above and beyond what the regulations require and have hired as many people from Greenland as possible — and of course our air support over there is from Air Greenland.

NIN: You mentioned that you’re focusing on Greenland right now, but you also have projects in Ontario and Manitoba. Could you talk a little about your plans there?

NR: We have two projects in Sudbury, Post Creek and Halcyon, they’re side by side. We’ve completed quite a bit of work such as trenching and surface mapping, diamond drilling and some surface geophysics. The one in Sudbury is on care and hold for now, we’re still looking for a strategic partner for this project.

The projects up in Thompson, Manitoba, we’ve completed the airborne surveys, have the interpretation in. We are looking into possibly drilling these targets this upcoming winter season, which would be the winter of 2014. We have somewhere in the neighborhood of four to six holes outlined to date. So that’s our plan. It’ll be VTEM follow-up diamond drill holes for our North Thompson project this winter. We’re looking forward to getting that work underway.

NIN: Your website notes that you’re open to seeking strategic partnerships to advance your properties. Are you currently doing so?

NR: We do have a strategic partner already in Maniitsoq. Our strategic partner there is the Sentient Group. We’re still looking for a partner for our Sudbury project. We are in talks with a few companies, but so far we’re just in discussions.

Image courtesy of North American Nickel.Maniitsoq 2013 field program.

NIN: The International Nickel Study Group has said nickel could record a 90,000-MT surplus this year. When you start producing, will there be demand for your product?

NR: Obviously demand is a big concern. And you’re correct, although I didn’t see 90,000, I have 70,000 to 80,000, which is not that far off. So short term, there will be a very strong surplus of nickel in the market. A report put out by Wood Mackenzie that looks at nickel supply says that for 2013, 2014, 2015 and even 2016, we’re going to have a surplus in nickel supply, but after there should be a shortcoming in nickel supply.

Now, this is from one group. It’s just like trying to predict the gold price. Some guys were saying $2,000 gold, but we’ve seen the gold price crash before we even got there. I think the supply of nickel is the same. It’s very country dependent, as in who’s consuming it. The big ones are China and Europe. If we are starting to see a rebound in European demand, maybe this will come through. But obviously we do anticipate a little bit of a slowdown in China, although their GDP is still pretty impressive at 7 percent, 8 percent. The next place we’re seeing a strong rebound in the market is Japan, and with auto sales doing well in North America, that might help with nickel consumption, but really it comes down to China playing a large role. It’s a big consumer of a lot of base metals.

NIN: Thank you very much for speaking with me.

The technical program for SAGA-AEM Joint Conferences 2013

Posted by on Friday, 26 July, 2013

SAGA 13th biennial conference – 6th to 9th October 2013
6th International Airborne EM 2013 – 10th to 11th October 2013
Skukuza Rest Camp, Kruger National Park
Mpumalanga South Africa


SAGA 2013 Conference Technical Programme

Click here to view the preliminary version of the SAGA 2013 Conference technical programme. A pdf version of the programme is also available for for viewing or download.

AEM 2013 Conference Technical Programme

Click here to view the preliminary version of the AEM 2013 Conference technical programme.pdf version of the programme is also available for for viewing or download.

Workshops and Short Courses

The workshop/tours list will be finalised end of July. Depending on registration numbers, some workshops will be cancelled and others will go ahead. Please register soon before end of July. Final workshop programme will be updated in August. The following workshops and short courses will be available during the conference. Download Workshops and Short Courses Information Pack.

Initial Drill Program Successfully Extends Blackbird and Black Horse Chromite Zones in Ring of Fire

Posted by on Tuesday, 23 July, 2013

Bold Ventures Inc. and KWG Resources Inc. announce jointly the following drilling results from the initial diamond drill program on their Koper Lake Joint Venture in the Ring of Fire (ROF) Northeastern Ontario, which is under option from Fancamp Exploration Ltd. (FNC) (see Bold’s press release dated January 7 2013). In turn KWG has optioned the property from Bold on terms that are described in a Bold press release dated March 4, 2013.

Drilling with three drills commenced early in March 2013. The drilling was briefly halted in early April 2013 pending the issuance of an Exploration Permit by the Ontario Ministry of Northern Development and Mines pursuant to the revised Ontario Mining Act.

In late May while drilling the last two holes of the program a forest fire, in close proximity, threatened the drill camp which housed the project personnel. All personnel were evacuated from the area until the fire was brought under control. As a result, the program budget was exhausted and the last two holes were stopped short of the target depth. Casing for holes FNCB-13-35 and FNCB-13-37 was left in place and capped for access at a later date.

During the program a total of ten holes (FNCA-13-29 and 29W1, and FNCB-13-30 to 37) totaling 6040.8 metres were drilled.

Drill Results Nickel/Copper Massive Sulphide Potential

Hole FNCA1329 was collared in the northwest corner of the Fancamp property to provide a platform for down hole geophysical surveying in a northerly oriented ultramafic conduit feeding the northeast-southwest striking Ring of Fire (ROF) ultramafic complex. A similar north-south striking conduit further west hosts the Eagle’s Nest copper-nickel base metal deposit previously discovered by Noront Resources Ltd. in 2007. The hole encountered poor ground conditions and had to be halted before reaching its target depth and was wedged off at 1015 metres. This wedge hole, FNCA-13-29W1, was advanced as far as 1051 metres when the hole was stopped and surveyed with a down-hole electro-magnetic system. Results did not warrant any further drilling from this platform.

Drill Results Chromite

Holes FNCB-13-30 to 37 were drilled to further explore the Black Horse chromite mineralization previously discovered by FNC (see Fancamp’s press release dated May 24th, 2011) as well as to test for the eastern extension of the Blackbird chromite mineralization located on the adjoining Noront Resources Ltd. claims (see Noront’s press release dated March 20th, 2012). The holes were drilled to test an approximate 800 metre strike length of the Blackbird – Black Horse horizon on the western most claim of the four-claim Koper Lake Property. The program was successful in confirming that chromite mineralization does exist within the Koper Lake property directly to the east of the adjoining Blackbird deposit owned by Noront Resources and also in extending the Black Horse mineralization outwards from previously drilled (2010) holes FN1025 and FN1026. Further drilling is required in order to understand the spatial relationship of the Blackbird and Black Horse horizons and the continuity and orientation of those mineralized zones.


Holes FNCB1330, 32 and 33 were drilled to test the downplunge continuity of chromite mineralization delineated on the adjacent Noront Resources property.

Hole FNCB1330 intersected 45.76 metres of chromite mineralization from 655.5 to 701.26 metres consisting of disseminated, heavily disseminated, semi-massive and massive chromite. This intercept contains two intervals dominated by massive chromite: from 664.67 to 677.65 metres (12.98 metres) and from 685.67 to 696.32 metres (10.65 metres). The weighted average percentage of Cr2O3 of these two intervals is 26.44% and 31.89% respectively.

Hole FNCB1332 encountered a thin band of massive chromite between 656.13 and 659.0 metres. The intercept assayed 34.48% Cr2O3 over 2.87 metres.

Hole FNCB1333 intercepted two intervals dominated by massive chromite, from 695.48 to 721.07 metres (25.59 metres) and from 753.0 to 813.26 metres (60.26 metres). The weighted average percentage of Cr2O3 of these two intervals was 27.98% and 28.31% respectively. These zones were encountered within a broader low-grade horizon of chromite mineralization.

Diamond drill holes FNCB1334 and 36 from the same collar location were drilled to test a shallow gravity anomaly which was interpreted to possibly represent the updip extension of the Black Horse mineralization.

Hole FNCB1334 drilled at -68 degrees encountered disseminated to layered chromite between 127.44 and 144.14. Assay results included 5.66 metres grading 18.51% Cr2O3 (from 137.58 metres to 143.24 metres).

Hole FNCB1336 drilled at -45 degrees intersected massive to heavily disseminated chromite between 126.44 and 132.84 metres. Assay results included 4.01 metres grading 18.56% Cr2O3 (from 126.44 metres to 1304.5 metres)

Holes FNC1335 and 37 were stopped short of target depth. Future plans will include continuing those holes to their completion.

Practical Inversion for Geoscientists

Posted by on Wednesday, 10 April, 2013

A short course on the why, how, and what of geophysical inversion

Presented by the B.C. Geophysical Society

This is a 2-day workshop consisting of 1 day of lectures (April 24th) followed by a 1 day hands-on workshop (either April 25th or 26th). Delegates can register for just the lectures or both the lectures and workshop.

Registration available until April 15th at:

Date: April 24th – 26th 2013

Address: SFU Downtown Campus; Vancouver BC

Registration: Registration is now open!  Please fill out attached pdf form (link below) and click submit.  Registration will be complete once payment is made via Paypal link.  Delegates are asked to choose one workshop day among April 25th or 26th.

Day 1 – Introduction to inversion
– Introduction to inversion in exploration

Reasons for doing inversion
Range of inversion options: magnetics, gravity, EM, IP-resistivity, seismic
Fitting geology and data

– Background on inversion

Joint and collaborative
The future of inversion

– Before inversion – forward modeling

forward modeling
petrophysics drives the story
complexity vs. adequacy

– Case studies

Potential fields

Day 2 – Workshop with Case studies
Multi-disciplinary teams will use geological, geophysical and geochemical data from two deposits (Babine Lake porphyry Cu-Mo, BC and Minto Cu, YK) to develop exploration targets. Teams will present their evaluations of the data to stimulate group discussion.

Inversion results for the available geophysical surveys will be presented to demonstrate state-of-the-art technology and best practices.
Sponsors for the short course are currently being solicited. Please contact Victoria Sterritt at for details. Proceeds go to the KEGS Foundation.
For those interested in more information about the short course, please email

Electrical Resistivity Tomography for placer gold deposit in Quebec

Posted by on Wednesday, 19 December, 2012

Uragold Bay Resources Inc. announces that the INRS (Institut National de la Recherche Scientifique) will be conducting a Syscal-Pro electrical resistivity tomographic survey and a Promis-10 electromagnetic FDEM survey on the Rang Chaussegros claims of UBR Beauce Gold property located in the municipality of Saint-Simon-les-Mines in the Beauce region of southern Quebec.

The INRS team, led by Dr. Marc Richer-LaFlèche, Ph.D (Geo) will perform a geophysical program that will include geoelectrical tomographic and frequency domain electromagnetic surveys. The geoelectrical tomographic survey will generate high resolution cross section images of the Quaternary overburden and the volcano-sedimentary layering of the bedrock formations of the Beauce Property. The result of the geoelectrical tomography will be correlated with Uragold’s sonic and other historical drilling data, in order to provide a 3D model of the placer gold channel composed of saprolite and brown basal till.

The aim of the program is to enable Uragold to evaluate, in greater detail, the shape, size, potential of the placer gold channel and to measure potential target extensions of the deposit. The program started last week with the cutting and picketing of a total of 7,500 meters of lines in order to form a rectangular grid on the property, between the Rang Chaussegros road to the west and Saint-Gustave road to the east. The grid will be used to perform the geoelectrical tomographic surveying.

Patrick Levasseur, president and COO of Uragold stated. “We are very proud that the special nature of our Beauce Gold project has attracted the scientific interest of the Quebec University INRS research team. This partnership will not only increase the overall understanding of the unique geological phenomenon of the region, but it will also allow us to establish an optimum mining plan for our Beauce Gold property.”

The Beauce Placer property was the site of Canada’s first gold rush in the 1850’s, years before the Klondike gold rush. Two of Canadada’s largest gold nuggets, the Kilgour nugget at 52 ounces and the McDonald nugget at 45 ounces, came from the Gilbert River, which flows through the property.

In the early 1960’s, the property was the site of a major placer gold mining operation. The Beauce Placer Company was the only commercial placer gold mining operation in eastern North America. The placers where mined with a floating Yuba dredge. The Company mined 56,000 oz of gold from an area representing less than 20% of the placer channel near St-Gustave road.

Gold production stopped in 1962 due to two major problems. First, they underestimated the depth of the overburden due to a westward dip of the bedrock. Therefore, the bucket-lined dredge of the Yuba dredge could no longer reach the auriferous pay zone. After modify the dredge by extending the bucket-lined boom, production-changed location to mine from west to east. Secondly, the Yuba dredge was designed to mine placer gold from sand and gravel. The pay zone in the western part of the channel consisted of clay (auriferous basil till). The dredge wasn’t equipment to separate gold from clay.

About the INRS

INRS is a university dedicated to fundamental and applied research, graduate studies and the training of researchers in its four research Centres in Quebec City, Laval, Montreal and Varennes. Part of the Université du Québec network, INRS University ranks first in Canada in terms of research intensity (funding per faculty member). Located in Quebec City, the INRS Eau Terre Environnement Research Centre is a world class research facility that brings together 40 professors, over 200 graduate and postgraduate students, and about 20 postdoctoral researchers.

Induced Polarization geophysical survey at the Idaho Gold Project

Posted by on Saturday, 8 December, 2012

Premium Exploration Inc.  reports that a ground-based Induced Polarization (“IP”) geophysical survey at the Idaho Gold Project (“IGP”) has successfully outlined a new target at the X Zone. This new IP target exhibits coincident highly anomalous gold-in-soil and airborne mag/EM signatures. These characteristics are similar to those associated with the three known deposits along the IGP and suggest potential for the discovery of new gold mineralization at the Idaho Gold Project. Details.

This is the 12th advanced target identified on the project. These twelve targets all exhibit highly anomalous geochemical signatures associated with strong airborne magnetic and electromagnetic and ground IP geophysical anomalies. The majority of the targets are yet to be drill tested.

For maps of the coincident X Zone IP and Soil targets, please click: and