Posts Tagged TEM

Airborne EM and down-hole gravity for gold intersection in NW Ontario

Posted by AP on Thursday, 16 May, 2013

Northern Shield Resources Inc. announces the intersection of significant visible gold during the first phase of a 3,000 metre drilling program being carried out this spring at the Wabassi VMS (volcanogenic massive sulphide) project located in northwestern Ontario. The Wabassi project is being explored under a 49/51 JV with Discovery Harbor Resource Corp.

In the process of drill testing Anomaly “N” (a high priority VTEM conductor defining a massive sulfide target), a quartz-carbonate alteration zone with a veinlet of visible gold was intersected from 98.8 to 98.95 metres in drill-hole 13WA-33. The 0.15 metre sample assayed 2,530 g/t Au (73.8 ounces/ton). A second interval assayed 5.86 g/t Au over 1.1 metre from 100 to 101.1 meters. The auriferous zone appears to be related to an intermediate intrusive dike or sill and occurs at the contact of this intrusive and the altered mafic volcanic rocks. Photos of the core containing the gold veinlet can be seen on Northern Shield’s website at www.northern-shield.com.

This intersection of gold is the fourth gold discovery that has been made to date within the Wabassi-Tempest properties and the second to contain visible gold. Globally, gold mineralization is present in a majority of VMS districts.

In total, four drill holes were completed in the first phase of the program, which was aiming at testing three VTEM targets (K, M and N). No other significant mineralization was identified nor was anything intersected to explain the VTEM anomalies.

A down-hole gravity survey (Gravilog) was also recently completed by Abitibi Geophysics at Anomaly E. The results from the survey show dense masses in the subsurface that are coincident with and ‘off hole’ from drill intercepts where strong zinc-copper-silver mineralization is present. The upcoming drill program will include the testing of these newly defined targets at Anomaly E, including tests to determine whether the modeled shallow mineralization is present as well as the mineralization modeled at depth. Sketches representing 3D models of the gravity survey results are posted on Northern Shield’s website.

The second phase of drilling is planned to resume immediately after the spring breakup period, likely at the end of May, 2013. Much of the second phase will be focused on continuing to define the copper-zinc-silver-gold mineralization at “E.” This includes several gravity anomalies, which support previous geophysical interpretation that the mineralization extends at depth. Additional drilling will also be planned to test this exciting new gold discovery at “N”.

The Wabassi project is being overseen by Christine Vaillancourt, Chief Geologist for Northern Shield and a Qualified Person under National Instrument 43-101. The drilling was conducted by Vital Drilling Ltd. of Sudbury, Ontario. Samples were analyzed by ALS Minerals laboratories in Vancouver, BC for Au by fire assay with ICP-AES finish and base metals by four acid digestion and ICP-AES. Ore grade gold was analyzed with ALS’s Au-GRA21 method, a fire assay with gravimetric finish. Down-hole gravity was completed by Abitibi Geophysics Ltd. of Val d’Or, Quebec.

Northern Shield is an innovative, results-driven Canadian company focused on Platinum Group Element (PGE) and nickel-copper-(PGE) exploration in Canada and Greenland and copper-zinc-silver exploration on its Wabassi and Storm properties in northern Ontario. Its mission is to create a successful mineral exploration company through technical excellence and efficient management, where success is measured by the identification and development of high-quality mineral exploration projects, which may ultimately be optioned, sold or developed for maximum return on investment.


Graphite discoveries in Northeastern Ontario

Posted by AP on Thursday, 16 May, 2013

Zenyatta Ventures Ltd. announced a drilling update on the 100% owned Albany (Hydrothermal) Graphite Deposit, located in northeastern Ontario, Canada.

The first drill hole (Z13-4F10) intersected 363 metres (‘m’) of graphite mineralization from 47.0 m to 410.0 m.  This represents the widest zone of graphite material intersected to date on the Albany deposit.  The hole, which was drilled at a 180 azimuth and -65 dip, was designed to test between previously drilled holes 5 and 9.  From surface to 41.0 m hole 10 intersected overburden and from 41.0m to 47.0 m intersected Paleozoic limestone.  Graphitic overprinting was encountered from 47.0 m to 87.0 m, while the strongest graphitic mineralization was intersected from 87.0 m to 410.0 m. Drilling shows different types of graphite mineralization consisting of clasts of graphite vein material, disseminated graphite matrix and discrete graphite veins / veinlets as part of a large breccia pipe.  Geometry and true width of the graphite breccia pipe is difficult to determine at this point and will require much more drilling.

The Company will continue to define the size and grade of this rare, ‘vein-type’ or hydrothermal-style graphite deposit.  The goal of the current program will be to expand on a 2012 drilling campaign that intersected a large mineralized zone of graphitic breccia and veining from widely spaced drill holes.  This previous nine (9) hole drill program succeeded in establishing widespread graphite mineralization laterally for several hundred metres and to a vertical depth of 400m, where it remains open. The current drilling will consist of a minimum of 10,000m and will further test the extent of the Geotech VTEM airborne conductor. The program will require 40 holes and is expected to continue until August, after which a NI 43-101 resource estimate will be calculated. The Company anticipates a steady flow of information from drilling activities and continued metallurgical work from this fully funded $4 million exploration program for the balance of 2013.

14 May 2013

Zenyatta Ventures Ltd. announced the following significant assay results from the first hole (#10) of the current campaign on the 100% owned Albany (Hydrothermal) Graphite Deposit, located in northeastern Ontario, Canada.   Drill hole 10 intersected 360.8 metres (‘m’) of graphite mineralization from 49.0 m to 409.8 m yielding an average grade of 5.1% Carbon (‘C’).  This represents the widest zone of graphite material intersected to date on the Albany deposit.  The hole, which was drilled at a 180° azimuth and -65° dip, was designed to test between previously drilled holes 4, 5 and 9.  Five more holes have since been completed, all of which yielded broad intervals of graphite mineralization from visual observations of drill core as described below.  Holes 11 through 15 have been designed to start outside the limit of the indicated anomaly and were angled to help define and confirm the overall geometry of the pipe-like body.  Drill hole data from all 15 holes is shown in a table at the end of this press release.

• Drill hole 11 intersected 202.0 m of graphite mineralization from 393.0 m to 595.0 m.

• Drill hole 12 intersected 195.0 m of graphite mineralization from   90.0 m to 285.0 m.

• Drill hole 13 intersected 219.0 m of graphite mineralization from   96.0 m to 315.0 m.

• Drill hole 14 intersected 286.9 m of graphite mineralization from 108.8 m to 395.7 m and a second zone of 127.3 m of graphite mineralization from 431.3 m to 558.0 m

• Drill hole 15 intersected 301.9 m of graphite mineralization from   63.3 m to 365.2 m.   (All lengths reported are drill intersected core lengths and do not represent true widths)

Aubrey Eveleigh, President and CEO stated “These latest results confirm the exceptional size potential of the Albany graphite deposit and along with the previously announced ultra-high purity (>99.99% C) values, underpins Zenyatta’s extraordinary graphite project. Hole 10 represents the best grade drill intersection obtained to date and the more recent drill holes are confirming both the internal continuity and the extent of the deposit.”   Graphite mineralization appears to consist of graphitic breccia pipes which are typically surrounded by a zone of graphite overprinted syenite. Carbon analyses for drill holes 11 through 15 will be released once received.  Drill hole 16 has commenced, and the current campaign will continue until sufficient drill holes have been completed, following which a NI 43-101 compliant resource estimate will be prepared.  A plan map, section and drill hole table will be placed on the website today.

The Company has also completed a ground geophysical survey to better define the geometry of the Albany graphite breccia pipes and expects the full data to be released in the next few days once a final report has been completed by Crone Geophysics and Exploration Ltd. The survey has defined two adjacent, strongly conductive, geophysical (EM) anomalies that are roughly circular in shape.  Holes 10 through 15 were drilled on the eastern most anomaly (Eastern breccia pipe), and are suggesting an oval shaped body approximately 200 metres in a NW-SE long axis by approximately 125 metres NE-SW.  Additionally, hole 11 intersected mineralization at approximately 500 metres vertical depth.  Drill intercepts appear to be correlating well with the shape of the ground geophysical anomaly with additional drilling required to confirm this model. The western anomaly (Western breccia pipe), which appears to be larger, will also be fully tested during the current drill campaign.


Drilling in the Snow Lake greenstone belt

Posted by AP on Thursday, 2 May, 2013

MS Ventures Inc. updates shareholders on the progress of its winter drill programs.

The Company has completed drill testing its 100%-owned base metal massive sulphide-type targets in the Snow Lake greenstone belt of Manitoba and several targets in the North Range of the Sudbury Basin, Ontario. All targets in Manitoba have been selected for drill testing subsequent to the integration of airborne VTEM or ground EM-magnetic geophysical surveys and Mobile Metal Ions (“MMI”) soil geochemistry coupled with a review of historic exploration databases. The Company completed 13 holes with two holes abandoned due to low water supply for a total of 3,259.9 metres. In Sudbury, the Company completed three skid mounted drill holes following up TDEM, VLF-EM and MMI anomalies on the Terra Incognita project for a total of 440.6 metres.

Drill testing of Manitoba targets began on the Reed East project and finished on our Copper project. All targets were confirmed as uneconomic iron sulphide mineralization, generally associated with graphitic argillite within basaltic host rocks.

Neil Richardson, COO states: “The cold winter and spring have been exceptionally good for skid mounted drilling with frozen ground providing good access to many of our planned targets. The cold weather created some problems with small ponds frozen solid, providing an inadequate water source for drilling of two targets. We continue to see excellent correspondence between our geophysical targets and the drill results in explaining the anomalies.”

The drilling for this season was completed on April 17, 2013. The final assay results for the last few holes are outstanding at the time of writing.


USGS: Iowa Meteorite Crater Confirmed

Posted by AP on Wednesday, 13 March, 2013

Recent airborne geophysical surveys near Decorah, Iowa are providing an unprecedented look at a 470- million-year-old meteorite crater concealed beneath bedrock and sediments.

The aerial surveys, a collaboration of the U.S. Geological Survey with the Iowa and Minnesota Geological Surveys, were conducted in the last 60 days to map geologic structures and assess the mineral and water resources of the region.

“Capturing images of an ancient meteorite impact was a huge bonus,” said Dr. Paul Bedrosian, a USGS geophysicist in Denver who is leading the effort to model the recently acquired geophysical data. “These findings highlight the range of applications that these geophysical methods can address.”

In 2008-09, geologists from the Iowa Department of Natural Resources’ (Iowa DNR) Iowa Geological and Water Survey hypothesized what has become known as the Decorah Impact Structure. The scientists examined water well drill-cuttings and recognized a unique shale unit preserved only beneath and near the city of Decorah. The extent of the shale, which was deposited after the impact by an ancient seaway, defines a “nice circular basin” of 5.5 km width, according to Robert McKay, a geologist at the Iowa Geological Survey.

Bevan French, a scientist the Smithsonian’s National Museum of Natural History, subsequently identified shocked quartz – considered strong evidence of an extra-terrestrial impact – in samples of sub-shale breccia from within the crater.

“The recognition of this buried geological structure was possible because of the collaboration of a local geologist, water well drillers, the USGS STATEMAP program, and the support of the Iowa DNR concerning research on fundamental aspects of Iowa geology,” said McKay.

The recent geophysical surveys include an airborne electromagnetic system, which is sensitive to how well rocks conduct electricity, and airborne gravity gradiometry, which measures subtle changes in rock density. The surveys both confirm the earlier work and provide a new view of the Decorah Impact Structure. Models of the electromagnetic data show a crater filled with electrically conductive shale and the underlying breccia, which is rock composed of broken fragments of rock cemented together by a fine-grained matrix.

“The shale is an ideal target and provides the electrical contrast that allows us to clearly image the geometry and internal structure of the crater,” Bedrosian said.

More analysis of the data will provide additional detail. These data show the impact as a nearly circular region distinct from the surrounding area to a depth of several hundred meters.

“These data, when coupled with physical property measurements on drill core samples, will form the basis for modeling efforts to constrain the impact geometry and energy of the meteorite,” said Dr. Andy Kass, a USGS geophysicist working on the effort.

The Iowa and Minnesota airborne geophysical surveys are targeting an igneous intrusion, known as the Northeast Iowa Igneous Intrusive complex, that may be similar to the Duluth layered igneous complex exposed in the Lake Superior region of northern Minnesota. Known copper, nickel, and platinum group metal resources were deposited during the formation of the Duluth complex. Both of these complexes are associated with a large structural feature known as the Midcontinent Rift, which is exposed in the Lake Superior Region but is covered by younger rocks as it extends to the south through Iowa, Nebraska, Kansas, and Missouri.

This geophysical survey is part of a larger USGS effort to evaluate the concealed mineral resource potential of the greater Midcontinent Rift region that formed about 1.1 billion years ago.

U.S. Department of the Interior, U.S. Geological Survey
Office of Communications and Publishing
12201 Sunrise Valley Dr, MS 119
Reston, VA 20192
Heidi  Koontz 1-click interview

Robert McKay


EMIT Maxwell Configuration File for VTEM system

Posted by AP on Sunday, 10 March, 2013

PDF file


New Airborne and Ground Geophysical Surveys on Detour Gold Trend Properties

Posted by AP on Friday, 1 March, 2013

Adventure Gold Inc. announces the commencement of a significant exploration program on its 100%-owned Detour Quebec project along the Detour Gold Trend (“DGT”) in Abitibi, Quebec. The exploration program will consist of airborne and ground geophysical surveys on the best targets identified last year following a comprehensive geological modeling of the DGT. A helicopter-borne electromagnetic VTEM-type survey (VTEM) totalling 575 km, 400 km of detailed ground magnetic surveys and 30 km of Induced Polarization (IP) surveys are currently underway or will start soon.

Since last year, the Company has been actively exploring its Detour Quebec properties by completing 103 kilometres of IP surveys, 365 kilometres of detailed ground magnetic surveys, and 912 kilometres of high-definition helicopter-borne magnetic surveys. This work has highlighted new and very promising drilling targets by identifying IP anomalies close to strong gold anomalies in till, along strike from positive gold results intersected by historical drill holes. Geological modeling outlined nine possible distinct bedrock source areas along the Sunday Lake, Massicotte, and Lower Detour/Grasset gold deformation zones on our properties. Three possible bedrock source areas were covered by geophysical surveys (IP and Mag) in 2012 and nine new ground geophysical surveys will be completed over the other areas this year (see Figure 1 and press release dated November 14, 2012).

On the two northernmost claim blocks (Manthet and Martigny) respectively located 15 and 25 kilometres from the Detour Lake mine, adjacent and close to the Ontario border, two VTEM surveys totalling 575 km will be completed. Historically, very little exploration work has been completed on these claims and limited drilling in one area outlined VMS-style gold, zinc and copper mineralization. This geological environment shows some similarities with the Martiniere project located further east, where Balmoral Resources Ltd is actively exploring the Martiniere West, Bug Lake, and Martiniere East zones. In this emerging gold play, very high-grade drill intersections were recently reported, namely 273.0 g/t Au over 3.9 metres and 11.7 g/t Au over 8.9 metres (see Balmoral Resources Ltd press releases dated August 16, 2012 and January 28, 2013). The VTEM-type survey is known for its exceptional depth penetration and provides a more accurate definition of electromagnetic anomalies than conventional systems. At the Detour Lake mine, the original discovery of the main zone is directly credited to the presence of an airborne electromagnetic anomaly detected during an Input-type survey in 1974. On the Manthet and Martigny claim blocks, new east-west and northwest trends outlined last year and interpreted as subsidiary faults of the Sunday Lake deformation zone will be covered by the VTEM survey.

“Following recent successes in identifying quality drilling targets, firstly by outlining the best areas using our comprehensive geological model and secondly by performing detailed geophysical surveys, we have great expectations for the 2013 geophysical surveys, which will be mainly conducted over new claims acquired in April 2012. Once this work has been completed, we will plan a substantial drilling program scheduled to start next winter”, stated Marco Gagnon, President and CEO of Adventure Gold Inc.

The Detour Quebec project includes nine properties, 100%-owned by the Company, totalling 747 claims and covering a surface area of 40,397 hectares or 404 km2. The Detour Quebec properties are strategically located along the DGT over 80 km strike length and encompass three major proven gold structures, namely the Sunday Lake, Massicotte, and Lower Detour/Grasset deformation zones. The DGT hosts the Detour Lake gold deposit with NI 43-101 proven and probable reserves of 15.6 M ounces of gold (from global measured and indicated resources of 23.3 M ounces and inferred resources of 5.8 M ounces: see Detour Gold Corporation press release dated January 25, 2012). Adventure Gold’s Detour Quebec properties are adjacent to Detour Gold Corporation properties located on the Ontario border.

For more information on the Detour Quebec properties, please see Figure 1 and visit our website at www.adventure-gold.com:

http://www.adventure-gold.com/common/documents/Detour_Figure1_Travaux2013_26fevrier2013.pdf

Jules Riopel, P.Geo., Vice-President Exploration and Acquisitions, acting as the Company’s “Qualified Person” as defined by NI 43-101, has reviewed this press release and supervised the exploration program on the Detour Quebec properties.


Down Hole Geophysics Confirms Significant Conductor at New Morning in Western Australia

Posted by AP on Saturday, 2 February, 2013

Western Areas Ltd provides an update from ongoing exploration activities at the new high grade discovery at New Morning, within the company’s

flagship Forrestania Nickel Operation.

Highlights

  • Assays have confirmed and extended the high grade discovery increasing the initial Niton estimate of 2.7m at 5.5% nickel to 3.0m at 6.3% nickel, including 2.4m at 7.6% nickel;
  • A down hole electro-magnetics survey (DHEM) has confirmed the company’s initial expectation that the high grade discovery hole has only intersected the edge of the mineralised zone with initial modelling indicating a plate approximately 150m x 250m wide; and
  • Forward work program being rapidly defined – initial steps to expand the discovery will see an immediate second drill hole commenced from the parent hole, targeted towards the centre of the modelled DHEM plate, followed by further DHEM tests to further refine targeting.

Western Areas Managing Director, Dan Lougher, said the Company was eager to follow up the recent geophysics and high grade assays with a sustained drilling program.

“We have previously stated that we believe the 6km between our two high grade mines of Spotted Quoll and Flying Fox are the most prospective for identifying a new high grade nickel deposit. Whilst drilling is still at an early stage, it is pleasing for the entire team to see the strategy starting to deliver results,” said Mr Lougher.

“The Forrestania Nickel Operation is a fully developed brownfields site, with power, water, roads and associated infrastructure all located along the prospective 6km belt meaning that any new deposit can be turned into an operating mine quicker and cheaper than any new greenfield discovery.

“We look forward to providing the market with updates as we continue drilling at New Morning,” said Mr Lougher.

Assays

Assays have now been received and have confirmed the high grade nature of the intercept, with improved intersection length and grade from the Niton measurements previously announced. NMD177 now measures 3.0m at 6.3% nickel, including 2.4m at 7.6% nickel. Deleterious elements (principally arsenic) are very low, and similar to the levels seen at Flying Fox.

Down Hole Electro-Magnetics

A DHEM test has been conducted on the lower portion of NMD177 with Newexco implementing the geophysical survey. The initial interpretation of the data by Western Areas’ exploration staff and Newexco indicates that a significant off-hole conductor exists to the south and slightly higher than the intersection announced. Whilst it is difficult to define the extent of the conductor from one hole, modelling of the DHEM data indicates a plate of approximately 150m by 250m. The DHEM data also indicates the current drill hole has not intersected the central portion of the plate, confirming our expectation that we may have only intersected the edge of this discovery.

The New Morning deposit is a medium grade nickel deposit, lying between the high grade Flying Fox and Spotted Quoll deposits.

The company believes that the potential for further Flying Fox or Spotted Quoll style mineralisation in this area is high, and significant exploration resources have been devoted to testing this area.


Airborne EM and Magnetic Gradiometer for Palladium-Platinum-Gold Project in Timmins

Posted by AP on Friday, 14 December, 2012

Gold Dynamics Corp. contracted with Geotech Ltd. to complete a helicopter borne Versatile Time Domain Electromagnetic (VTEM Plus) and Horizontal Magnetic Gradiometer Geophysical Survey on the Hoyle North Palladium-Platinum-Gold Project located in Timmins, Ontario. A total of 84 line kilometers of geophysical data were acquired, flown at 100 meter spacing on the property.

Analysis of the preliminary data from the VTEM Plus indicate mineralized targets exist in the eastern portions and also a mineralized trend from the southeast to the northwest of the property at approximate depths of 200 meters. The survey also identifies a system of dykes which are very common in mineralized zones on this trend and are also common to the known geology of this area.

Further results and analysis are expected in the next few weeks. This information will be evaluated to select targets for ground follow-up in order to help prioritize anomalies for drilling.

Gary Kirk, CEO/President of Gold Dynamics Corp. said, “I am extremely pleased that we were able to contract with Geotech Ltd. who are a leader in their field, utilizing state of the art technology to help us build our base of knowledge on the Hoyle North project. With targets in hand, knowing the depth and location of these targets brings us much closer to finally drilling. The known geology common to the areas where other major international mining companies (Goldcorp, Xstrata Copper, Lakeshore Gold and Brigus Gold), whom are adjacent to our project, are currently producing large quantities of gold and other precious metals out of geologic structure very similar to what the VTEM Plus has identified in ours; is very encouraging for us.”

The Hoyle North property is contiguous to Goldcorp’s Hoyle Pond mine and is within short distances to significant resources such as Owl Creek and Bell Creek. The Hoyle North property remains relatively unexplored near to expansive mining and exploration efforts by significant companies such as, Goldcorp, Xstrata, Lakeshore Gold, San Gold, Osisko Mining and VG Gold and others.


Airborne geophysics results on Mexico’s Guerrero gold belt

Posted by AP on Saturday, 8 December, 2012

Citation Resources Inc. announces preliminary results of its airborne versatile time-domain electromagnetic (“VTEM“) survey completed in October 2012 over a substantial portion of the Biricu Gold Project located within Mexico’s Guerrero gold belt.

The VTEM survey was conducted by Geotech Ltd. and covered approximately 1,400 line kilometres at 150 metre spacing over three specific high-priority areas of the concession within a broader survey coverage at 200 metre spacing. Condor Consulting Inc. experts in the field of airborne electromagnetics, has been retained to perform a detailed interpretation of the results and their final report regarding the significance of the survey is still pending.

The preliminary interpretation by Condor has identified 19 potential target zones as defined by conductivity and magnetic geophysical anomalies on the Biricu Project. Six of these target zones are aligned along a 5 kilometer northeast trending corridor, which to date has only been partially ground tested. A field crew has been mobilized to conduct further mapping and sampling over the geophysical anomalies in order to prioritize areas for possible drill testing. Upon receipt of the final geophysical interpretation, the results will be integrated with the analysis of the field work completed and drill targets will be prioritized. The details of the final results will be presented in a future news release.


Airborne EM Survey over the Blu Starr Flake Graphite Property in BC

Posted by AP on Monday, 22 October, 2012

Anglo Swiss Resources Inc. has announced plans to commence an airborne electromagnetic (EM) survey over its Blu Starr Flake Graphite Property located near Nelson in southeastern BC. The property adjoins Eagle Graphite Corporation’s flake graphite operation which is one of only two natural flake graphite mines in North America. Next to Eagle Graphite, Anglo Swiss holds the largest land package covering 6,473 hectare (~65 sq. km) in the southern part of the favourable Valhalla Metamorphic Complex (see attached maps).

The planned ~550 line-kilometre survey will complete EM geophysical coverage over the entire property expanding on the 2010 survey completed by the Company. The earlier survey outlined a three kilometre long, shallow south-dipping conductor on the north side of Perry Peak which correlates well with numerous outcrops of large flake graphite occurrences known as the Tedesco showing. At this time the total thickness of the graphite bearing units is unknown as this conductor has not been drill tested. The new EM survey will cover the southern half of Perry Peak and central part of the property with the goal of identifying the possible southern extension of Tedesco as well as new large EM conductors. Aeroquest Airborne Limited will be conducting the EM survey utilizing the AeroTEM IV system.

Geology – Property

The varied geology of the property has been extensively mapped. Metamorphic rocks of the Valhalla Complex in the Passmore Dome area belong to the “upper sheet,” lying between the Airy quartz monzonite sheet dated at 62 Ma and the underlying Mulvey granodioritic gneiss sheet dated at 100 Ma. Graphite and minor sulphidebearing carbonate and calc-silicate layers lie at a structurally higher level in the the upper sheet, than that of the cordierite (iolite) and corundum (sapphire) bearing lenses that appear to lie within or near to the Gwillim Creek shear zone.

The Tedesco area geological map units cannot be directly correlated with other areas of the Slocan property. The Tedesco area hosts distinctive graphitic marble layers not known to occur on other areas of the property. During mapping and surveying, five distinct rock unites were observed.

Research –  Geophysical Survey

IP surveys of this property have identified a pronounced anomalous chargeability, possibly attributed to flat-lying marble or calc-silicate horizons containing concentrations of conductive graphite, possibly with other associated sulphide minerals such as pyrrhotite and pyrite.

The total magnetic field survey produced dissimilar but conspicuous magnetic features that might be attributed to either magnetite or pyrrhotite in the host rock.


Geophysical surveys in Colombia for VMS

Posted by AP on Thursday, 18 October, 2012

CuOro Resources Corp. announces that Geotech Ltd. of Aurora, Ontario (“Geotech”) has been engaged to complete a 416 line-kilometre, helicopter-borne versatile time-domain electromagnetic (“VTEM”) survey of the Santa Elena Copper-Gold Project, in Antioquia Department, Colombia.

Geotech’s VTEM system has been shown to be excellent at identifying conductive, massive-sulphide bodies as well as mapping lateral and vertical variations in resistivity. The VTEM system is also equipped with a high sensitivity magnetometer which can aid in mapping geologic structure and lithology.

The survey is expected to be completed during October 2012. The Company will immediately investigate any targets generated by the survey with exploration and drilling.

Santa Elena Overview

Santa Elena is classified as a bimodal-mafic VMS deposit. This type of deposit is similar to that found in many of the major district of the Precambrian Shields of Canada, Western Australia, and Scandinavia, as well as the Urals and in the Cretaceous of Peru. The latter is comprised of the giant Tambo Grande deposits; TG1 and TG3, adjacent deposits comprising a single ore system contain a non 43-101 compliant resource of over 138 MT of 1.3% Cu and 1.1% Zn. The Tambo Grande deposits are in a very similar setting to the Santa Elena occurrence, and given that both are in what appears to be an oceanic back-arc setting, this district may be a model for Santa Elena. It is important to note that VMS deposits almost always occur in districts, and that their sizes are log-normally distributed.

The concessions contain 1,287.5 hectares near the north end of the Antioquia batholith, at the intersection between the San Pablo formation (Cretaceous marine sediments) located to the north, the basaltic volcanic flows located to the west, and the Antioquia batholith quartz-diorite complex to the east.

The infrastructure is excellent and includes paved road access, two hydroelectric plants within 5 km, and abundant water supply.

Geological mapping and sampling has identified 3 VMS areas of outcropping (TEM-1, TEM-2, and TEM-3) all of which coincide with historical geophysical anomalies. Several new mineralized outcrops have been located recently south of the known VMS outcrops.

Recently completed geophysical surveys have validated the historical data, as well as produced many new targets which will be drill tested.

Summary of Geophysics

A surface geophysical TEM survey at 50 m intervals was conducted on a selected area of the property where outcropping mineralization was visible. The survey was conducted by VAL D’OR Geophysics for Noranda Mining and Exploration Inc in 1996-1997.

The historical ground geophysics had identified 4 strong conductors with good vertical extent, 3 of which are coincident with the TEM-1, TEM-2, and TEM-3 outcrops.

An airborne magnetometer and radiometric survey was flown in August 2011. These surveys were followed-up by ground based induced polarization and resistivity surveys. These surveys validated the original survey data, and also generated several new drill targets which are currently being drill tested.

The company plans to initiate down-hole TEM surveys along with additional induced polarization and resistivity surveys in January 2012.


Trenching Results and Surface TDEM Survey on Sudbury Properties

Posted by AP on Wednesday, 19 September, 2012

VMS Ventures Inc. announces the results of a surface time-domain electromagnetic (TDEM) survey on its 100% owned Terra Incognita project and the first phase of trenching on its 100% owned Golden Pine project. Both projects are located north of the Sudbury basin and approximately 40 kilometres northeast of Sudbury, Ontario.

Neil Richardson , COO states: “We are pleased with the TDEM survey over the Terra Incognita project, which has provided at least three significant targets for our planned 2013 winter drilling program. As well, the first phase of our trenching program at Golden Pine shows that the MMI soil geochemistry survey is outlining bedrock-hosted gold mineralization, which we will now follow-up with trenching and channel sampling.”

The surface time-domain electromagnetic survey at Terra Incognita completed late last winter has now been incorporated into the company’s GIS database (Image 1: http://media3.marketwire.com/docs/VMSimage1.pdf). The TDEM survey was completed by Crone Geophysics Ltd. of Mississauga, Ontario on a grid cut by a crew from the Wahnapitae First Nations. The survey covered approximately 20 line kilometres with station readings taken every 25 metres and line spacing of 100 metres. Six TDEM anomalies were outlined from this survey, with three ranked as high priority targets. Two of the high priority targets have coincident Mobile Metal Ion (MMI) geochemical anomalies and VLF geophysical conductor anomalies. Drilling is planned to test these targets in the upcoming 2013 winter drilling program.

The first phase of trenching has been completed on the Golden Pine project where two separate areas were mechanically stripped to expose the bedrock; a total area of 400m2 was excavated. These trenches focused on a coincident Induced Polarization geophysical anomaly and a Mobile Metal Ion geochemical anomaly over an inferred contact between granite and intermediate volcanic rocks. A second trench focused on a MMI anomaly near historical zone B. Results from the first phase of channel sampling yielded assay results of up to 12.00 g/t gold over 0.50 metres. Two continuous samples averaged 11.68 g/t gold over 1.00 metre in an intermediate volcanic rock in the first trench area (Image 2: http://media3.marketwire.com/docs/VMSimage2.pdf).

The Terra Incognita property is situated in Parkin Township approximately 30 km north of Sudbury and 20 km north of Capreol. The property consists of 28 unpatented mining claims comprising 41 units of 40 acres each. The geology and contained geophysical anomalies defined by historic geophysical surveys is enigmatic owing to thick overburden cover. Airborne geophysical surveys followed by soil geochemical surveys to prioritize geophysical anomalies are planned. This approach has been demonstrated to be very effective in focusing exploration on VMS Ventures’ base metal massive sulphide-type properties in the Flin Flon greenstone belt in Manitoba.


Results of an Airborne Geophysical Survey in Tanzania

Posted by AP on Monday, 27 August, 2012

Continental Nickel Limited reports the identification of twenty-five new high priority VTEM anomalies from the recently completed 2,409 kilometer airborne magnetic and electromagnetic (EM) survey within the regional land holdings comprising the Nachingwea Project located in southeast Tanzania. The project is part of the 75:25 joint venture between CNI and IMX Resources Limited of Australia.

Highlights of the 2012 Airborne Survey

  • Large, high amplitude late time EM anomaly coincident with the Hog gold prospect
  • Twenty-five high priority targets selected for ground follow-up
  • 1,500-2,000 metres of RC drilling planned

Patricia Tirschmann, VP Exploration, commented: “We are pleased to have completed another successful regional VTEM survey and are very encouraged by the number of high quality targets generated. The identification of an EM anomaly coincident with the Hog gold prospect further enhances the exploration potential of this target and we look forward to drill testing it and other high priority targets beginning in September.”

The airborne geophysical survey was carried out by Geotech Limited of South Africa employing the Versatile Time-Domain Electromagnetic (VTEM) geophysical system. The survey ran from July 29th to August 11th and a total of 2,409 kilometers were flown in five flight blocks. The location of the survey is shown in Figure http://media3.marketwire.com/docs/VTEMjpeg.pdf.

The flight blocks comprising the 2012 airborne VTEM survey were selected by prioritizing areas based on results of the 2010 airborne magnetic and radiometric survey in combination with results of geochemical sampling and geological mapping. Preliminary data from the new VTEM survey is currently being evaluated, and targets are being selected for ground follow-up in order to help prioritize anomalies for drill testing later in the year.

Analysis of the preliminary VTEM data indicates that EM anomalies have been detected on each of the five flight blocks and approximately twenty-five of these represent high priority anomalies with late channel responses. Of potential significance is a high amplitude late time EM anomaly detected on three 200 metre spaced flight lines which is coincident with the Hog gold prospect where surface gossan grab samples returned values of up to 4.96 g/t gold and 0.64% copper (May 25, 2012 Press Release). Several other VTEM anomalies are also confirmed to have coincident copper and/or nickel in soil anomalies.

The Company plans to carry out 1,500-2,000 metres of reverse circulation drilling to test selected high priority regional VTEM and geochemical anomalies including the Hog gold prospect. This drilling is currently expected to begin in mid-September.


Airborne TDEM Survey over Graphite Mousseau East property in Quebec

Posted by AP on Thursday, 2 August, 2012

Standard Graphite Corp. announces that the results from an airborne geophysical survey flown over its Mousseau East property coincide with the outline of the known mineralization. The survey has also identified targets in other sectors of the property where no historical work has been reported.

Airborne magnetic (MAG) and time domain electromagnetic (TDEM) surveys were flown by Prospectair Geosurveys over the Mousseau East property during the month of June to precisely locate the conductors associated with the graphite-bearing units in preparation for the field program (see press release 21 July, 2012). Results clearly outline the main Mousseau East zone where a historical resource has previously been outlined and also traces the along-strike extension towards the west. The extension of the main zone will be targeted for resource expansion during the upcoming diamond drilling program scheduled to commence soon.

During the survey, some conductors were also reported outside of the known mineralized area and its direct extension, notably towards the east of Oat Lake. These conductors are currently being investigated for graphite outcropping by Standard’s field team.

To view a map of the TDEM results please click here:

http://www.standardgraphite.com/i/pdf/EM/mousseau.pdf

Chris Bogart, President and CEO comments on the progress at Mousseau East: “The geophysics has proven its efficiency at outlining the known graphite zones at our historic Mousseau deposit. We are excited at the prospect of expanding our current historic resource both along-strike and at depth and potentially discovering new zones as suggested by the TDEM survey.”


Airborne EM Survey over the Oldest Meteor Impact Site

Posted by AP on Tuesday, 24 July, 2012

North American Nickel Inc. reports that fifty zones of conductivity, many with significant strike lengths, have been identified in preliminary data from its recently completed VTEM Plus helicopter time domain electromagnetic survey over its 100% owned Maniitsoq project in Southwest Greenland.

The Geological Survey of Denmark and Greenland (GEUS) had recently announced the discovery of the oldest-known meteorite impact site in the world, rousing the company’s interest in its Maniitsoq project.

More than twelve of the fifty have already been identified as higher priority zones which have the potential to become targets for the company’s upcoming drill program in August. A more detailed analysis of all the VTEM Plus data is underway.

NAN CEO, Rick Mark, states: “We are very pleased that the VTEM Plus system has been successful in delineating fifty new conductors. With this data, we already have a dozen new targets similar in priority to the three drill targets previously identified in last fall’s smaller SkyTEM survey, some with apparent strike lengths in excess of 1 km. Now that we can point conclusively to conductors occurring throughout the 75 km long belt, we are more comfortable than ever in describing this as a camp-scale exploration play.”

The Greenland Norite Belt (GNB) is a 75 km long by 15 km wide belt of crustally contaminated noritic intrusions with numerous historical, high-grade nickel sulphide showings (e.g. 9.85 m averaging 2.67% Ni and 0.60% Cu at the Imiak Hill showing). Mineralization within the belt has consistently high nickel tenor (6-8% Ni in 100% sulphide according to work done by Falconbridge in 2000).

Despite its obvious high prospectivity, the GNB has seen little drilling. A total of 119 holes totalling only 6,300 m, for an average hole length of less than 53 m, were drilled in the 1960′s and 70′s. More recent exploration programs stopped short of drilling due to a lack of EM anomalies to guide drilling. NAN’s strategy at Maniitsoq has been to use modern helicopter borne TEM systems to develop drill targets and it has proven successful. This technology was not available to previous explorers.

The VTEM Plus survey, combined with a SkyTEM survey flown by NAN last year, provides the company with high resolution TEM coverage over a total area of 860 square kilometers centred on the Greenland Norite Belt).

Data from the VTEM Plus survey is currently being processed and interpreted. All significant electromagnetic anomalies will be checked in the field and ranked. The highest priority targets will be tested during a drill program that is planned to commence in August.

The survey, which ran from June 20 to July 17 and comprised 3,532 line-km of surveying, was performed by Geotech Ltd. of Toronto, OntarioCondor Consulting Inc. of Lakewood, Colorado provided daily QA/QC analysis of the data.

http://media3.marketwire.com/docs/nan-0724-image1.pdf


“Detecting vanadium and graphite deposits with EM methods”

Posted by AP on Monday, 23 July, 2012

CARMELA BURNS on JULY 19, 2012

“The recent rush to find graphite and vanadium deposits to satisfy potential demand in green energy applications is reigniting airborne electromagnetic (EM) methods as highly effective exploration tools.”

read more..


Geophysical Targets on the Cerro Quema Property

Posted by AP on Tuesday, 29 May, 2012

Pershimco Resources Inc. announces the results of the geophysical survey recently completed over its 15,000 Ha 100% owned Cerro Quema property. These are the first high resolution geophysical surveys completed over the entire extent of the concessions.

These preliminary results and associated interpretations highlight the following:

  • Numerous new geophysical targets with similar magnetic, radiometric and electromagnetic signatures as those over the La Pava and Quema/Quemita gold resources.
  • Induced Polarization (IP) survey results correlate well with drill hole assays that show gold and copper mineralization associated with strong silicic alteration and deeper chargeable sulphide zones.
  • These new geophysical results have generated additional drilling targets along strike of known resources at La Pava and Quema/Quemita.

Induce Polarisation Survey (IP)

The purpose of the IP survey with an effective depth down to 200m, was to define and expand on the known near surface resistive zones associated with silicic alteration which host gold mineralization at the La Pava project. An additional objective was to define and expand on the deeper chargeability and conductive zones known to be associated with the copper/gold mineralization as previous drilling results earlier published by the Corporation have confirmed.

The resistivity map shown below highlights a robust resistivity anomaly with approximate dimensions of 400m x 300m. This resistivity anomaly is coincident with the La Pava project with gold mineralization hosted in the oxide zone of a silicic altered volcanic unit. This IP anomaly has also highlighted a northerly and westerly extension of this resistive unit located outside of the current pit design. These extensions will require drill testing to evaluate their potential.

The chargeability map highlights a chargeability anomaly of approximate dimensions of 600m x 350m. This chargeability anomaly coincides with deeper sulphide mineralization identified by drilling at the La Pava and Chontal projects.

Figures 3 and 4 shown below show selected profiles (A-A’ and B-B’) of resistivity and chargeability results respectively over the La Pava project.

The Corporation is encouraged by these IP results over the La Pava and Chontal projects which clearly outline the mineralized host units present. Combined with the preliminary airborne geophysics interpretations, the Corporation will now complete additional IP geophysical surveys over the Quema/Quemita project and additionally over the newly identified targets identified by the airborne geophysics.

Airborne survey (VTEM-Mag-Rad)

The airborne survey was completed using a total field magnetometer, a gamma-ray spectrometer (U, Th, K) and a time domain vertical axis electromagnetic system (VTEM). This survey entirely covers Pershimco’s 100% owned Cerro Quema project in Panama. The objective of the survey was to define the magnetic and radiometric signatures of the LaPava and Quema/Quemita resources and additionally to identify similar signatures within the property.

Figure 5 shows a reduced to pole of TMI image. This figure highlights the low magnetic susceptibility with coincident low potassium and high Th/K ratio signatures over the La Pava, Quema/Quemita and Chontal projects.

Figure 6 highlights numerous new geophysical targets with similar signatures both within and along strike of known mineralization in La Pava and Quema/Quemita resources.

Alain Bureau, President and CEO, states: “We are very pleased with the recently completed geophysical surveys and the associated interpretations. These results have confirmed our in-house geological and mineralization models. The follow-up of these new targets will now allow us to evaluate the full potential of our Cerro Quema property in Panama.”

http://www.pershimco.ca/NouveauSite/pdf/Communique_de_presse_29_05_2012_ANG.pdf