Archive for category Case study

Supervised Neural Network Targeting and Classification Analysis for Mineral Exploration

Posted by on Tuesday, 29 April, 2014

Karl Kwan (Geotech LTD) presented at Canadian Exploration Geophysical Society meeting (8 April 2014) methodology and examples of using Neural Network Targeting and Classification at mineral exploration.

“Geophysical survey contractors routinely offer multi-parameter data to clients. For example, a helicopter-borne survey may acquire Time-domain electromagnetic (TDEM), magnetic gradiometer and even gamma-ray spectrometer data (i.e., VTEMplus, Geotech LTD). Exploration geophysicists can certainly take advantage some of the readily available multi-disciplinary (geology, geophysics and remote sensing) and multi-parameter (potential field, EM, gamma-ray spectrometry, and others) datasets for mineral exploration. However, the integration and interpretation of these datasets can be time-consuming and even challenging, especially for large-scale datasets covering large areas with diverse geological conditions. The Supervised Neural Network (NN) Targeting and Classification technique for mineral exploration described and demonstrated by Reford, Lipton and Ugalde, 2004, “Predictive Ore Deposit Targeting Using Neural Network Analysis” (http://www.pgw.on.ca/downloads.html), can be a useful and promising tool for the analysis of multi-disciplinary and multi-parameter data.

In this presentation, the properties or responses of the two feed-forward multilayer Neural Networks, Levenberg-Marquardt (NN with LM training) and Fast Classification (FCNN), as implemented in the current version by PGW, are studied in detail. The supervised NN simulations are performed on specially constructed synthetic data. Intended as a tutorial and the NNs treated as black boxes, the objectives of the exercise are twofold, to demonstrate the targeting as well as classification capabilities of the Neural Networks, and at the same time to show one of the known limitations and to suggest a way to get around it. The utility of the NN tool is demonstrated again with real cases from the Republic of Niger.”

Geosoft is delighted to host the online portion of the Canadian Exploration Geophysical Society meeting with keynote speaker Karl Kwan, Geotech LTD.

YouTube:  


Airborne TEM impels VMS discoveries in Manitoba

Posted by on Thursday, 29 September, 2011

VMS Ventures Inc. announces follow-up results from the new copper zone discovery “Reed North” on its Super Zone property located 1.8 kilometres northeast of the Reed Copper deposit. The Super Zone is part of a parcel of four property packages adjacent to the Reed Copper deposit which are under option to HudBay Minerals Inc.  Reed North was previously referred to as the Super Zone Discovery.

To view “Figure 1. VTEM EM Anomalies” and “Figure 2. VTEM Anomalies with Magnetic Tilt” accompanying this press release, please click on the following link: http://media3.marketwire.com/docs/vms929i.pdf

HIGHLIGHTS

  • Hole RLE021 Intersects 3.95 m of 9.31% Cu, 1.87% Zn, 3.59 g/t Au, and 35.53 g/t Ag
  • Hole RLE022 Intersects 4.15 m of 2.16% Cu, 0.18% Zn, 0.71 g/t Au, and 8.01 g/t Ag

Neil Richardson, VMS’ Chief Operating Officer states: “The drilling results and the follow-up borehole pulse electromagnetic surveys on the Reed North discovery support our interpretation that this is a highly prospective area. The mineralization is at, and around, bimodal volcanism. This is especially encouraging as it is the setting in which the larger deposits tend to be located, in VMS camps around the world.”

The bimodal volcanism and the strong alteration over a large area suggest a large hydrothermal mineralizing system. HudBay has now drilled twelve (12) holes, for a total of 3,591 metres, on this discovery. Two mineralized horizons have been recognized and a possible third, a deeper target, has been identified by deep penetrating geophysical surveys over the area. Drilling will continue to focus on this area where the geophysical anomaly associated with the mineralization has been traced for more than 1 kilometre. The mineralization seen to date is semi-massive to stringer (remobilized) type sulphides. Variable amounts of pyrrhotite and chalcopyrite occur, with lesser amounts of sphalerite and magnetite.

PREVIOUSLY RELEASED SUPERZONE HIGHLIGHTS

  • Hole RLE004 Intersects 0.34 m of 5.41% Cu, 0.27% Zn, 1.58 g/t Au,
    and 7.57 g/t Ag (May 17, 2011)
  • Hole RLE006 Intersects 7.18 m of 7.44% Cu, 0.23% Zn, 0.48 g/t Au, and 7.57 g/t Ag
    and 44.9 m of 0.79% Cu, 0.39% Zn, 0.16 g/t Au and 1.58 g/t Ag (May 17, 2011)
  • Hole RLE007 Intersects 2.23 m of 5.94% Cu, 0.27% Zn, 0.40 g/t Au and 5.50 g/t Ag
    and 24.70 m of 0.21% Cu, 1.18% Zn, 0.08 g/t Au and 0.79 g/t Ag (August 9, 2011)

DRILL SUMMARY FOR THE HUDBAY JV AND OPTIONED PROPERTY PACKAGES: MARCH THROUGH SEPTEMBER, 2011

  • Reed Lake joint venture: two holes were completed for a total of 724 metres,
  • Super Zone option: nine holes were completed for a total of 2,482 metres,
  • Tower Zone option: one hole for a total of 1,082 metres,
  • Northwest option: three holes completed for a total of 820 metres and
  • Northeast option: one hole for a total of 349 metres.

One drill will continue to explore the option properties concentrating on the Reed North discovery zone until winter freeze up.


DARNLEY BAY – summer results and discoveries

Posted by on Tuesday, 14 September, 2010
Base Metal Targets
The exploration and drill targets for base metals, shown in Figure 1, were prepared from analysis and modelling of the recently completed gravity, electromagnetic and magnetic surveys flown over a large portion of its properties near Paulatuk, NT. The analysis was prepared in conjunction with mapped geology, topography, satellite imagery and previously acquired airborne and ground geophysical data.
The following provides a summary of the 41 separate base metal exploration targets selected as a result of the analysis and modelling:
Gravity (22 targets) 76 km2; Magnetic (7 targets) 108 km2; Electromagnetic (12 targets) 54 km2.
The methods indicate the data type where the target is most evident, although many targets incorporate coincident or complementary geophysical responses from at least two data types. The base metals targets are broken into several categories, depending on the nature of their responses and their estimated depths. Nine of these targets are designated for assessment by geological prospecting and sampling as they may outcrop.
Location map showing the 41 base metals targets on the 100%-owned properties of Darnley Bay Resources Limited. The red dashed outlines indicate the two areas of highest priority for follow-up.
3D Gravity Modelling
Geoscientists study the earth’s gravity field to determine the density of the rocks in the subsurface. Changes in density from surface to tens of kilometers in depth affect the gravity field that we measure. The more basic (mafic) classes of igneous and metamorphic rocks, and most metallic minerals, have higher densities and produce stronger gravity responses. The 132 mGal Darnley Bay gravity anomaly is perhaps the strongest of its kind in the world, reflecting an isolated intrusion.
In 2007, Darnley Bay contracted Mira Geoscience, through its Vancouver office, to apply 3D modelling to the ground gravity and airborne magnetic data available over the Darnley Bay anomaly and surrounding region. A 3D model of a large, deep-seated mafic/ultramafic intrusion was developed to explain the anomaly on a regional scale. The effect of this model was subtracted from the gravity and a more detailed model of the upper 10 km of the earth’s crust was prepared from the residual gravity field, to ascertain the shape of the anomaly source at depths of economic interest. The modelling in 2007 resulted in the reassessment of the geological models to explain the anomaly source and its mineral potential. Darnley Bay realized that it required gravity data in much greater detail before embarking on a drill program.
Northtech Drilling Ltd. commenced drilling Darnley Bay’s first 2010 base metals target on August 28.
Target EM-8 is currently being drilled, an electromagnetic anomaly with coincident magnetic response interpreted from the 2010 VTEM survey (see target map on the home page at www.darnleybay.com). It will be followed by target M-7, a magnetic anomaly with coincident electromagnetic response. Both drill holes are at 65° from the horizontal with a length of 300 m. Concurrently, other targets are being followed up on the ground with gravity and magnetic surveys, and geological prospecting, to prioritize targets for the continuing drill program.
The airborne gravity survey (Sander Geophysics) completed in April 2010 confirmed the size, shape and amplitude of the Darnley Bay anomaly and greatly improved the resolution and detail. Mira Geoscience was once again contracted to prepare a 3D model. Mira utilized the same regional model for the intrusive body and prepared a new model of the upper 10 km of the earth’s crust from the airborne survey’s residual gravity field. It utilized the free-air gravity field and incorporated a correction for the surface topography. Since the surface rocks incorporate a range of gravels and sediments with different densities, their effects cannot be fully corrected for and as a result, some topography is visible in the model.
The software used to prepare the new 3D model is Mira’s implementation of the GRAV3D module developed by the Geophysical Inversion Facility at the University of British Columbia.  The 3D inversion was constructed as follows:
1. Preparing a representation of the earth as a volume measuring 63.5 km E-W by 66.0 km N-S by 10.25 km vertically. The cells within the volume measure 500 m x 500 m x 250 m.
2. Implementing geological constraints, incorporating the sediments mapped on surface and their densities, and the log of Darnley Bay’s 2000 drillhole.
3. Applying the GRAV3D inversion, which determines a geologically reasonable density to each cell in the model while best-fitting the observed gravity data. This process takes several days of continuous iteration on a massively parallel computer.
The result is a 3D volume model where the density varies between each cell. For display purposes, a series of density surfaces are extracted from the model to better appreciate the geometry and concentrations of higher density material.
DISCOVERY OF THREE KIMBERLITE PIPES
Darnley Bay Resources Limited and Diadem Resources Ltd. announce that they have completed the first phase of 2010 drilling on their 50/50 joint venture package of 33 claims on the Parry Peninsula, Northwest Territories. Of the four targets drilled, three have resulted in the discovery of new kimberlite pipes. These are in addition to the ten kimberlite pipes discovered in 2000, of which six have proven diamondiferous. The kimberlite material intersected in the 2010 drilling is being prepared for shipping to CF Mineral Research Ltd. in Kelowna BC for analysis.
Darnley Bay and Diadem are quite encouraged by the initial success of the drill program. Numerous high priority targets remain untested. The results of this first phase are being incorporated in planning for the second phase of 2010 drilling, as well as determining the targets that are better suited for drilling from frozen lakes in February-April 2011. Diadem is funding the 2010 program.
Hole MT112-01
This hole targeted a 1.7 ha ground magnetic low of 10 nT amplitude, partially covered by a lake. It intersected 15.35 m of kimberlite, hosted in dolomite. The kimberlite intersection is described as “Dark green to black, fine grained matrix consisting of dark green ferro-magnesian minerals and 10 to 35% green partially altered olivine and peridotite fragments, some being completely talc altered. Contains numerous greenish, subrounded possible mantle derived fragments to 100 mm.”
Hole MT102-01
This hole targeted a 3.6 ha ground magnetic low of 325 nT amplitude, partially covered by a lake. It intersected 7.6 m of kimberlite, hosted in dolomite. The kimberlite intersection is described as “Dark gray to blackish-green, massive, fine to medium grained kimberlite (micro breccia). The mass of the kimberlite comprises dark green 1-5 mm mafics in a white clay – calcite matrix.”
Hole MT10-03
This hole targeted a 10.2 ha ground magnetic low of 105 nT amplitude, partially covered by a lake. It intersected 0.6 m of kimberlite, hosted in dolomite. The kimberlite intersection is described as “Dark gray to black, loose packed, sub-rounded to sub-angular wall rock and some mantle derived fragments in a fine to medium grained matrix. Fragments consist of 1 to 25 mm black mudstone and chert, gray dolomite and some greenish-gray, rarely apple green, serpentinised mantle-derived xenoliths.”

ZTEM – Copper porphyry mineralization under the cover

Posted by on Monday, 13 September, 2010

Millrock Resources Inc. released results of exploration work carried out at its Galiuro porphyry copper-gold project in southeastern Arizona.

Recent drilling by Millrock resulted in the discovery of porphyry copper mineralization and alteration in Cretaceous – aged rocks hidden beneath Tertiary volcanic cover rocks. While no ore grade intersections were obtained, Millrock geologists are strongly encouraged by the results.

Philip St George, Millrock VP of Exploration stated: “The drilling results are very exciting. We’ve intercepted copper porphyry alteration and mineralization. As we suspected from our mapping, Tertiary volcanic cover is quite thin. The rocks we have drilled are indicative of higher levels and/or proximal alteration assemblages in a porphyry system. Further drilling to depth, and in interpreted upthrown fault blocks to locate the ore shell of this porphyry system is warranted and will be carried out as soon as possible.”

The drilling and other exploration work done by Millrock and VEC allows the companies to conclude that:

  • The ZTEM airborne geophysical system has been successful in identifying areas of increased conductivity in Laramide-aged rocks below Tertiary cover due to disseminated sulfides, clay alteration and structures.
  • As indicated by diatreme breccia-style mineralization, silicification and advanced argillic alteration, the level of paleo-exposure in the sub-Tertiary cover rocks is shallow, probably within 500 m of the paleosurface.
  • A porphyry environment with favourable host rocks and potential for high grade deposits is indicated by the presence of bornite mineralization and diabase host rock.

Hole GAL_1001, drilled to 1,591 ft intersected hematite and goethite rich leach cap and phyllic altered (quartz-sericite-pyrite) rocks with pyrite content of 1% to 2%. Copper oxides and fine disseminated chalcocite replacing pyrite was observed. The intersection from 1,314.5 ft to 1,338.8 ft graded 0.2% Cu over 24.3 ft. Diatreme breccia was also intersected in the hole.

In Hole GAL_1002, a hole drilled to 2,229 ft, a porphyry system was indicated by acid leached diorite porphyry intersected below Tertiary volcanics at 786 ft. Near the bottom of the hole phyllic alteration (quartz-sericite-pyrite) with 3-4% pyrite and minor chalcopyrite and chalcocite was intersected, as was intrusive breccia with bornite. The sulfides in these two holes explain the ZTEM conductive zones. Two anomalous intersections were obtained in GAL_1002. The first intersection is form 919.0 ft to 929.5′ for 10.5 ft grading 0.12% Cu. The second intersection is from 1,924.5 ft to 1,979 ft for 54.5 ft grading 0.06% Cu. The presence of bornite is quite encouraging, as it typically occurs only in unusually high grade porphyry systems such as at the Resolution deposit located 80 km to the northeast of the Galiuro project.

Hole GAL_1003 was drilled to a depth of 1,979.0 ft in a porphyry system after cutting below late, post-mineral Tertiary basalt from the collar down to 720 ft. Pre-mineral rocks to the bottom of the hole include a mix of Laramide diorite and andesite with Precambrian sediments and diabase. The presence of diabase is encouraging as it can create a chemical trap for high grade mineralization. The higher-grade portions of the nearby Resolution and Ray deposits are hosted by diabase, The diabase is cut by numerous magnetite veinlets that may be related to potassic alteration. No significant copper results were obtained from laboratory analysis of the drill core.


The new Matagami-type VMS Camp

Posted by on Monday, 31 May, 2010
MacDonald Mines Exploration  has announced today that the 2010 exploration drilling program on its McNugget Property has discovered new volcanogenic massive sulphide (VMS) mineralization of substance. Preliminary assays are reported below with follow-up full assays pending and will be reported when received. An analysis of technical data completed in February 2010 found magnetic and electromagnetic (“EM”) targets that were not previously explained. During the May portion of the 2010 drilling campaign, a Crone Geophysicsdown-hole EM system was used for drill target control – it has been established that McNugget VMS horizons show strongest conductivity where copper (Cu) content is highest.
A new VMS camp with characteristics similar to those seen at Matagami or Noranda in Quebec is now conceivable (i.e., larger VMS deposits with satellite deposits along strike).”
Massive sulphides were intersected in all May 2010 drill locations with widths varying from 2m to greater then 30m. One of the drill sites (two holes) on the McNugget Property intersected massive magnetite as well as associated ultra mafic materials. This location is characterized by a long magnetic high (magnetite) with an associated electromagnetic conductor (VTEM). These characteristics are very similar to those of the Freewest/Cliffs chromite discovery. The core from these two intersections is currently being tested for chromite. Additonal geophysics will be planned along this long trend (1.5 kilometres) to aid in interpreting the potential of this zone to host chromite.
Big Mac Property
MacDonald’s February 2010 re-interpretation created an initial program of 5 high-priority high-resolution ground gravity survey transects for both chromium (Cr) and nickel-copper (Ni-Cu) mineralization. Transect models were based directly on known mineralization signatures discovered within the “Ring of Fire”. The Company’s claim block contains both discrete and strike-extensive coincident airborne magnetic-VTEM and gravity anomalies within stratigraphically favorable geological packages with geophysical signatures similar to the significant Cr discoveries of Freewest and KWG-Spider near McFaulds Lake. Three gravity drill targets all exhibited anomalous densities coincident with local magnetic trends and have been interpreted to be steeply plunging dense bodies. Drilling was completed on one these targets in April 2010. Assays are pending. One of the gravity transects identified a density anomaly coincident with a discrete conductivity (VTEM) anomaly and offset magnetic feature that will be drill investigated for nickel.
Hulbert-Salo Property Exhibits Voisey’s Bay-type Targets
MacDonald is designing an exploration program for its highly prospective Hulbert-Salo Property which appears to host an intact intrusive complex with potential for Voisey’s Bay-type targets, as interpreted by Dr. Larry Hulbert. The Company’s airborne geophysical survey (VTEM) outlined very conductive, discrete targets within a layered magnetic structure. The high conductivities observed are typical of magmatic massive sulphides containing nickel. To optimize the Company’s chances of success, a surface time domain geophysical survey is being designed that will focus on the potential nickel targets. A Crone Geophysics‘ system will be used in the event that other more conductive (superconductors) and/or deeper targets were not detected by the airborne survey.
Exploration to Recommence June 2010
The next phase of exploration will commence in late June 2010. MacDonald believes that there is potential for its James Bay properties to host both Nickel and Chrome on the McNugget, Big Mac and Hulbert/Salo Properties.
As the assays become available, 3D target modeling will be based on assays, geology, magnetic susceptibility, conductance and so forth. Further drilling will provide greater detail on three selected VMS targets as well as the strongest potential Ni-Cu targets. It is anticipated that deeper drilling will be required to test the high conductance targets mapped by the geophysical programs used during May.

Magnus Copper-Gold project update

Posted by on Tuesday, 25 May, 2010
Alchemy Resources Limited advises that the first round of exploration drilling at its Magnus Copper‐Gold Project in Western Australia has produced promising results which highlight the potential for the area to host repeats of Sandfire Resources Ltd’s neighbouring DeGrussa discovery.
The drilling program at Magnus, which is located 130km north‐east of Meekatharra, comprised seven reverse circulation (RC) holes on seven high priority targets that were identified by a VTEM survey completed in December 2009 (http://explorationgeophysics.info/?p=607). The first seven RC holes were selected across the width of the Magnus project to conduct initial testing of the high priority conductors identified by the VTEM survey and to assist with targeting the drilling of the remaining 26 priority conductor targets.
The initial drilling at Magnus has:
successfully identified extensive stratigraphic horizons within the prospective Narracoota volcanic formation with the potential to host volcanogenic massive sulfide (VMS) deposits. The Narracoota volcanic formation hosts the rich DeGrussa copper‐gold deposit; and
identified minor disseminated sulfides, which in conjunction with geochemical tests being done on bedrock samples, may help to uncover VMS mineralisation.
Down‐hole electromagnetic (DHEM) surveys were carried out in five of the RC drill holes. DHEM surveys are used to identify the source of any conductors that were not intersected in the hole by drilling.
In four of the RC drill holes, which intersected dominantly mafic volcanic and intrusive rocks with minor interflow shales, the source of the VTEM anomaly remains unexplained and will be followed up with further drilling to determine the source of the conductor. In the other three drill holes, intersections of thick intervals of shale are believed to explain the original VTEM anomaly.
Re‐modelling of the VTEM and DHEM data was carried out to better determine the geometry and conductivity of the sources of anomalies. These results, in conjunction with ground electromagnetic surveys, will refine the location of modelled conductors prior to further drill testing.
Forward Program
Ongoing drilling at Magnus will test up to another 26 bedrock conductors identified by the VTEM survey.  Other activities will include targeted ground‐based EM surveys to complement the VTEM survey and identify exploration targets at depth.
“These results are very encouraging and provide Alchemy with more strong evidence that Magnus hosts the geology associated with world‐class VMS deposits such as the DeGrussa discovery,” Alchemy Managing Director Michael Hannington said. “We will now push full‐steam ahead with the next phase of drilling at Magnus to test this enormous exploration potential.”


The discovery!

Posted by on Thursday, 20 May, 2010

Peregrine Diamonds Ltd.   reports the discovery of the CH-17 kimberlite on the Chidliak project on Baffin Island, Nunavut, Canada. The discovery of CH-17, 35 kilometres north of the nearest known kimberlites, CH-6 and CH-10, is further confirmation that Chidliak is a highly prospective and large Canadian diamond district. Formerly geophysical anomaly 166, CH-17 is the northernmost of two high-priority magnetic anomalies, 165 and 166, that have similar geophysical characteristics and are situated 200 metres apart under the same lake. Each of the anomalies has estimated surface expressions of at least one hectare. With this discovery, Peregrine management is confident that anomaly 165 is likely also a kimberlite.

The CH-17 drill core was described in the field as being macrocrystic olivine-rich kimberlite, containing country rock and mantle xenoliths, and abundant kimberlite indicator minerals. Pyrope garnet and chrome diopside grains up to 30 and 15 mm in size, respectively, were observed.

The CH-17 kimberlite is the first target drilled this year and the seventeenth kimberlite discovered at Chidliak since 2008. The discovery was made by drilling a vertical core hole from lake-ice into the centre of the high-priority magnetic anomaly and kimberlite was intersected underneath 41 metres of water and 2.5 metres of overburden. Three metres of kimberlite drill core was recovered before the hole was terminated due to drilling difficulties. A map showing CH-17 and the adjacent anomaly 165, and photographs of drill core, are available at: http://www.pdiam.com/i/pdf/chidliak613.pdf.

A second hole was not immediately attempted at CH-17 to allow for a thorough review and analysis of the drilling issues by Peregrine and the drilling contractor. While awaiting delivery of drill supplies, a geophysical anomaly 1.6 kilometres north of CH-17 was drilled because of its proximity to a favourable kimberlitic indicator mineral train. No kimberlite was intersected and the anomaly was explained by magnetic gabbro. The indicator mineral train is now interpreted as having likely originated from CH-17 and anomaly 165.

Since the CH-17 discovery hole was terminated on May 3, there have been ten days where weather did not allow access to the drill because of low visibility and/or high winds and blowing snow. In addition, unseasonably warm local weather has led to the formation of slush on the lake hosting CH-17 and anomaly 165. Both CH-17 and anomaly 165 cannot be efficiently drilled from the lake shore. For safety reasons, after a comprehensive analysis by an independent ice engineer, Peregrine has decided to postpone further drilling on the lake-ice at this particular locality until the spring of 2011. The drill is currently being moved to test two additional lake-based targets, anomalies 290 and 291 (see map at link noted above), that have more favourable lake-ice drilling conditions, and drilling is likely to commence in the next few days. Up to 30 land-based kimberlite targets are expected to be drilled this year during the spring and summer programmes at Chidliak.

Discoveries of high concentrations of kimberlitic indicator minerals (“KIMs”) on the 980,000 hectare Chidliak property in 2006 and 2007 encouraged Peregrine to look for new kimberlite deposits in the area due to the excellent potential for further diamond discovery. The property is located 150 km northeast of Iqaluit, capital of Nunavut. Three distinct and well-defined KIM anomalies situated 20 to 30 km apart were identified. Peregrine collected a total of 970 till samples at Chidliak in 2006 and 2007, of which 286 samples, or 29 percent, contained KIMs. The full suite of KIMs have been recovered from the property, including p-type pyrope garnet, eclogitic garnet, chrome diopside, picroilmenite, chromite and forsteritic olivine. A significant number of the KIMs were over 1.00 mm in size. Kimberlite mineral grains larger than 1.00 mm are not common and are often a strong indication of a proximal kimberlite source. Ten percent of the 2,284 p-type pyrope garnets that were analyzed by electron microprobe are classified as high-chrome, low-calcium G10 garnets. G10 garnets are commonly associated with diamond mines throughout the world. Based on the favorable indicator mineral results, a heliborne magnetic/electromagnetic survey commenced in July, 2008, the survey, flown at 100 metre line spacing, was completed in August.

The CH-1 kimberlite was discovered when a kimberlite outcrop within a circular magnetic anomaly selected from an airborne geophysical survey was identified.

More…


Success on Wabassi/Max property

Posted by on Thursday, 13 May, 2010

Northern Shield Resources Inc. The Wabassi and Max properties are located in northwestern Ontario, 60 km south of the Highbank Lake project and 100 km south of the Ring of Fire Ni-Cu-PGE and Chromite deposits. The properties are being explored for reef-hosted PGE and massive sulphide Ni-Cu-PGE deposits.

The Wabassi and Wabassi North properties were staked by Northern Shield Resources Inc. in 2007 based on the geophysical pattern observed on the magnetic survey published by the Ontario Geological Survey (OGS) in the Fort Hope area, which suggests a layered intrusion. Now four mafic-ultramafic intrusions are known to exist within the two properties.

WABASSI LAYERED INTRUSION
This is a layered mafic-ultramafic intrusion composed of olivine-gabbronorites and norites in the upper (northern) portion. To date, very little exploration has been conducted on the southern portion but it is now believed to represent the lower, and most prospective, levels of the intrusion.

WABASSI LAYERED INTRUSION
This is a layered mafic-ultramafic intrusion composed of olivine-gabbronorites and norites in the upper (northern) portion. To date, very little exploration has been conducted on the southern portion but it is now believed to represent the lower, and most prospective, levels of the intrusion.

WABASSI NORTH INTRUSION
Other than one drill hole, no other exploration has been conducted to date on the Wabassi North Property. Drilling intersected a variety of gabbroic rocks which may, or may not be related to the main Wabassi layered intrusion or the Max peridotite intrusion. The geophysics suggest that this body may consist of composite phases of gabbroic and other mafic/ultramafic phases.

MAX PERIDOTITE INTRUSION
Five drill-holes were completed on this target by Northern Shield in 2007 as part of an option agreement to earn a 50% interest in the property. The body is composed mostly of peridotite (harzburgite) and comprises the most primitive rocks intersected to date within the two properties. The body has high background levels of Ni-Cu-PGE. Geophysics suggests a possible feeder conduit between the Max peridotite and Wabassi North gabbro.

GABBROIC INTRUSION
An intrusion in the southern portion of the Max property (see figure above) has been mapped by the OGS as a gabbroic body, but no exploration has taken place to date on this portion of the Property.

WABASSI LAYERED INTRUSION
The Wabassi intrusion is a well-layered mafic-ultramafic complex with similarities to the Stillwater Complex in Montana, where PGEs are mined from the J-M reef. Rock-types so far identified include, olivine gabbronorites, olivine norites and norites; these are all ideal lithologies in nickel and PGE bearing systems. The intrusion is being explored for Ni-Cu-PGE massive sulphides along the contacts and in feeders, and for disseminated mineralization hosted in “reefs”.

Based on geophysical interpretations and surface sampling, the Wabassi layered intrusion appears to be composed of two districts series, the Cyclic Series and the Layered Series.

Ongoing studies and interpretation of the Wabassi intrusion have isolated two layered sequences that will also be prospected for disseminated reef-type PGE mineralization and chromite. Disseminated mineralization and chromite are not usually detected by airborne EM surveys.

A VTEM survey completed over the Wabassi property has detected three distinct clusters of electromagnetic (EM) anomalies (WAbassi A, B & C.) The strength of the conductors range from moderate to very strong and correspond to magnetic highs. One of the clusters of VTEM anomalies can be traced intermittently along a magnetic feature that has strike length of 2000 meters. The location and geometry of this body suggests it may represent a feeder conduit into the main Wabassi Intrusion. Feeder conduits are ideal hosts for Ni-Cu-(PGE) mineralization. Fragments of nickel-bearing pyrrhotite and blebs of primary nickel-copper mineralization were observed in core from a drill-hole completed in 2008 adjacent to one of the VTEM conductors.

One of the VTEM anomalies at Wabassi.

May 2010.

At the A2 anomaly (see Wabassi Target map on Northern Shield’s website), drill-hole 10WA-07 intersected 2.25% zinc (Zn), 31.7 g/t silver (0.92 oz/ton) and 0.17% copper over 49.5 meters, including a higher grade section of 7.07% Zn over 7 meters. Three sample intervals from this drill-hole also contained over 100 g/t silver including a 0.7 meter interval grading
536 g/t silver (15.66 oz/ton) and three other intervals contained over 12% Zn. Drill-holes 10WA-05 and 06, targeting the A1 anomalies, intersected pyrrhotite-dominated massive, semi-massive and disseminated sulphides containing copper, silver, zinc and nickel mineralization. Eighty-five of the one hundred and thirty-four samples assayed from drill-hole 10WA-05 assayed greater than 5g/t silver. Drill-hole 10WA-07 intersected volcanic rocks and volcanogenic massive sulphide (VMS) zinc-silver-copper mineralization adjacent to the contact with the Wabassi Intrusive Complex. Drill-holes 10WA-04 to 10WA-06 intersected rock types predominantly consisting of mafic and ultramafic lithologies belonging to the Wabassi Intrusive Complex. Drill-hole 10WA-05 intersected pyrrhotite-dominated massive, semi-massive and net-textured sulphides with a chemical signature suggesting
that it may be a hybrid mixing of VMS and magmatic (nickel-copper) systems. Drill-hole10WA-06 intersected disseminated copper sulphide mineralization.
Ground and down-hole EM surveys have been running contemporaneously with the drill program to provide better resolution of the conductive bodies discovered from the airborne VTEM magnetic and electromagnetic survey. Preliminary results from the ground and down-hole pulse electromagnetic surveys suggest that drill-hole 10WA-07 (zincrich) apparently has only intersected the edge of the A2 anomaly and that this target may be more extensive than previously thought.
Michael Senn, Executive Vice President of Discovery Harbour comments: “From the instant we saw the compelling geophysical signatures from the Wabassi VTEM survey and the geological interpretation that was compiled by the Northern Shield technical staff during PDAC, Discovery Harbour was convinced of the strong probability of success in the drill testing of these exciting targets.

Oscar magnetite project in progress

Posted by on Thursday, 29 April, 2010

Apollo Minerals (Australia), an iron ore explorer and developer, has reported on exploration progress at its Mt Oscar Magnetite Project in the Pilbara Province of Western Australia, during the quarter.

An exploration target of 350 to 650 million tonnes grading 30% to 37% in situ iron was modelled for Apollo’s Mt Oscar Magnetite Project. Metallurgical tests demonstrated >60% iron concentrate grades are achievable.

In addition to undertaking initial metallurgical testwork and commencing a detailed geological mapping program at Mt Oscar, the volume/tonnage modelled from aeromagnetic data was upgraded in light of the better than expected apparent thicknesses of magnetite-bearing banded iron formation (BIF) encountered in recent drilling.

Exploration Target

Detailed forward and 3D magnetic models, generated in 2009 by independent geophysical consultants Southern Geoscience Consultants (SGC) from airborne magnetic data flown by Apollo over its Mt Oscar project area, have been revised to take account of the results of the company’s recently completed drilling program.

This modelling was undertaken to assist in the ongoing exploration of the project, and to refine estimates1 of volume/tonnage of the highly magnetic BIF.

The combined estimate over portions of Apollo’s licence (E47/1379 – Mt Oscar) and the recently acquired Mt Oscar East (E47/1304) is an exploration target1 of 350 million tonnes (“Mt”) to 650Mt of magnetite-bearing BIF, grading 31% to 37% iron in situ.

This modelling is based on interpretation and modelling of geophysical data, rock-chip sampling and the December 2009 RC drilling information from Mt Oscar, and geophysical data and rock-chip sampling at Mt Oscar East.

Float mapping at the Ibis Prospect confirmed the presence of near-surface magnetite-rich metasediments similar to those observed at Sequoia.
Interpretation of airborne and ground magnetic data acquired by earlier explorers indicates that the Ibis anomaly comprises a number of parallel bands of magnetic material, ranging in thickness from 20 m to 50 m, occurring discontinuously over a total strike length of 4 km.


Quantec Titan results in Nevada

Posted by on Monday, 26 April, 2010
Boxxer Gold Corp.  announces the results of the Quantec TITAN-24 DCIP/MT survey completed over its 100% owned Boss and Crystal Pass projects located in the Goodsprings Mining District, southwest Nevada. The identified targets combined with the previous exploration results suggest huge potential for the district.
Highlights
 Significant number of targets outlined, most targets open in two directions:
– Boss Extension: 15 targets outlined,
– Crystal Pass: 17 targets outlined;
 Diamond drill program planned to test recently identified targets.
Boxxer’s President and CEO, Elmer B. Stewart, explained, “The results from the Quantec Survey are the single most significant set of data generated from our Boss and Crystal Pass projects in the last 18 months. The number of new targets has moved Boxxer a major step closer to proving the porphyry potential for this district. The large TITAN-24 DCIP and MT
targets coincide with previously identified zones that display conductivity at depth, interpreted intrusives and mineralized skarn, all resulting in the generation of numerous very high quality diamond drilling targets at Boss and Crystal Pass. We are encouraged by the dimensions of the chargeability and resistivity responses in the new target areas interpreted to contain
porphyry copper style mineralization as this is consistent with the porphyry copper model being used by Boxxer to explore the Goodsprings Mining District.”
A total of three high priority targets (high chargeability and conductivity), six moderately-high priority targets (high chargeability and moderate conductivity), 15 moderate priority (high chargeability and resistivity), six moderate-low priority targets (shallow or deep conductivity) and two low priority targets were located over the Boss and Crystal Pass areas. Please see press release dated March 16, 2010, for the parameters of the Quantec Survey.

Results of the 2D inversion of the IP using Null reference data along line L1 (on the top)

Results of the 2D inversion of the MT data along line L1 Boss area (on the bottom)


Chilean GEODATOS has finished the TEM survey for lithium

Posted by on Saturday, 20 March, 2010

Salares Lithium Inc. reports the results of the first phase of a transient electromagnetic survey (“TEM”) completed on the northern portion of the Salar de la Isla. This salar is part of the Company’s Salares 7 project in Region III, Chile. The TEM survey was carried out by Geodatos SAIC (“Geodatos”) of Santiago, Chile, and was designed to define the size and extent of the brine pool within the salar. The majority of the world’s lithium production comes from salars, or salt lakes, where prospective lithium mineralization is generally hosted in brine horizons.
Salar de la Isla, which encompasses a total of 16,500 hectares, is approximately 15 kilometres (“km”) long and 6 km wide on average. The northern area surveyed and studied comprises approximately 10,750 hectares, which is approximately 65% of the areal extent of the salar. Using the results obtained from the 38.5 line km survey, Geodatos has constructed a three dimensional model of the distribution of the interpreted brine bearing horizon. Using a resistivity cut-off of 1 ohm/metre (interpreted by Geodatos as definite brine), Geodatos has calculated the brine bearing horizon within the northern portion of the salar to have a volume of 2.459 billion kilolitres (kilolitres are equivalent to cubic metres). Using a resistivity cut-off of 2 ohm/metres (interpreted by Geodatos as possible brines) the calculated volume of this horizon increases to 5.393 billion kilolitres.

A gravity survey is being initiated on Salar de la Isla as the TEM survey was unable to penetrate to the base of the salar which indicates that the salar has a depth in excess of 200 metres. There is potential for additional brine bearing horizons beyond where the TEM was able to penetrate to.

“We are excited about the volume calculation identified by Geodatos and the fact that it only accounts for the northern portion of one of the Company’s seven salars. The experience Geodatos represents regarding the TEM survey and the relationship of the correlation of 1 ohm/metre as definite brine with potential of brine up to 2 ohm/metre, is encouraging. The Company will now be required to drill/sample the extensive interpreted brine horizons before a porosity value and a resource calculation can be established”, commented Todd Hilditch, CEO of the Company.

The Company intends to complete an additional 13 kms of TEM survey lines on the southern portion of the salar to enable the entire salar to be modelled in a similar fashion. Further, some of the existing lines will be extended to completely investigate the lateral extent of the interpreted brine bearing horizon. In order to fast track the exploration program on the remaining six salars, the Company has instructed Geodatos to double the size of the geophysical crew.

The TEM survey lines for Las Parinas were extended beyond the boundaries of the salar on to areas covered by alluvial and / or volcanic material. The survey identified a continuous brine bearing horizon that extended up to 2.5 kms from the salar edge and underneath the adjacent rocks. The three survey lines averaged approximately 9 kms long each.

Using the results obtained from the 26.5 line km survey, Geodatos has constructed a three dimensional model of the distribution of the interpreted brine bearing horizon. This horizon extends from surface to a depth of 170 metres.

Using a resistivity cut-off of 1 ohm/metre (interpreted by Geodatos as probable brine), Geodatos has calculated the brine bearing horizon within the surveyed portion of the las Parinas to have a volume of 1.177 billion cubic metres. Using a resistivity cut-off of 2 ohm/metres (interpreted by Geodatos as possible brines) the calculated volume of this horizon increases to 4.009 billion cubic metres.

Management is very encouraged by these initial geophysical results and intends to commence the brine sampling program as soon as the relevant equipment can be secured and moved on-site. Results from additional TEM and gravity surveys will be released as interpreted and received from Geodatos.


Pigeon River – the new geophysically promising area

Posted by on Sunday, 14 March, 2010

In January 2009, Pele Mountain announced the staking of more than 1,000 mining claim units totaling approximately 18,750 hectares in the Pigeon River area of Northwest Ontario, about 80 kilometres west of Thunder Bay. The 100-percent owned property covers very large unexplored magnetic targets with potential to host nickel (“Ni”), copper (“Cu”), and platinum group elements (“PGE”) mineralization.

The property lies in the Proterozoic Superior Mid Continent Rift, a geological setting with proven potential to host mafic-ultramafic igneous systems associated with the rifting of the Archean cratons.  Pele’s exploration target at Pigeon River is a massive sulphide deposit similar to recently discovered magmatic sulphide deposits hosted in an ultramafic body or conduit, such as Kennecott`s Ni/Cu/PGE deposits at Eagle (in Michigan) and Tamarac (in Minnesota) and Magma Metals’ PGE deposit northeast of Thunder Bay.

Pele Mountain Resources Inc. March 5, 2010  announced the completion of a 1,015 line-kilometre Versatile Time-Domain ElectroMagnetic (“VTEM”) airborne survey over its Pigeon River property in the Thunder Bay area of Northern Ontario. Pele has staked more than 500 additional mining claim units since introducing the project in January and its total land package now exceeds 24,000 hectares (240 km2). Pele President and CEO Al Shefsky stated, “Our property is ideally situated in the Mid Continent Rift, near the basal contact of the Duluth Complex. The survey shows magnetic and conductive trends with similarities to known Ni/Cu/PGE deposits in similar geological settings. We are particularly encouraged by the correlation of conductivity with a known, anomalous, Geological Survey of Canada (GSC) Ni/Cu lake sediment sample. These results have increased our confidence in the potential of the Pigeon River property and we will prioritize exploration in this area in the months ahead.”
The VTEM survey was flown over the Pigeon River East Block by Geotech Ltd. of Aurora, Ontario. The survey has defined linear magnetic features with the potential for mafic/ultramafic conduit systems and feeder dykes into larger mafic/ultramafic intrusions. Preliminary analysis by the geophysical contractor indicates the presence of a number of, possible sulphide-related conductors, coincident with conduit-type magnetic features and other, larger, conductive anomalies with similarities to known mineralized layered mafic/ultramafic complexes. Conductive zones, possibly sulphide-related, are also found in the vicinity of a GSC lake sediment anomaly which gave anomalous values of 234 parts per million (ppm) Ni and 298 ppm Cu. Geotech has identified several high-priority, drill-ready, targets from the survey. Other priority targets require further definition through prospecting and follow-up geophysical surveys, which are planned after spring breakup. The targets are generally till or swamp covered and no previous prospecting, mapping, or geophysical surveys, other than an airborne magnetic survey flown by the GSC in 1964, are known.

HudBay Minerals wins award for pushing deep hole geophysics technology that led to discovery

Posted by on Tuesday, 9 March, 2010
HudBay Minerals Inc.’s geophysics team, led by Alan Vowles, and its exploration team, headed by Kelly Gilmore, has presented with the Bill Dennis Award for a Canadian discovery by the Prospectors and Developers Association of Canada (PDAC). The award recognizes the company for its Lalor zinc discovery near Snow Lake, Manitoba, and presented on March 2, during the PDAC’s annual convention in Toronto.

The Lalor deposit was discovered in March 2007. The deposit is located in the Chisel Basin portion of the Flin Flon Greenstone Belt and is believed to be the largest VMS deposit found in this region to date.

Zinc rich base metal zone: Mineralization occurs in six separate stacked lenses of zinc rich polymetallic near solid to solid sulphide mineralization approximately 570 meters to 1,170 meters below surface. In October 2009 an Indicated Resource of 12.3MT 1.6 g/t Au, 24.2 g/t Ag, 0.66% Cu, 8.70% Zn, and an Inferred Resource of 5.0MT 1.4 g/t Au, 25.5 g/t Ag, 0.57% Cu, 9.39% Zn were disclosed.

Gold zone: Low sulphide precious metal intersections associated with chalcopyrite and galena. In January 2009, HudBay reported the discovery of a new gold zone with the potential to have principal credits derived from gold mining and on October 8, 2009 announced a conceptual estimate of a potential gold zone, interpreted as five discrete mineralized lenses that can contact the near solid sulphide zinc rich mineralization.

Copper-Gold zone: Disseminated to near solid chalcopyrite with lesser pyrrhotite and minor pyrite, sphalerite and galena located to the north of Gold zone 27 at approximately 15 to 20 degrees down plunge and at vertical depths of between 1,200 and 1,300 meters.

For more details on the Lalor deposit, including the resource estimate for the zinc-rich base metals zone and the conceptual estimate of the potential Gold zone, please refer to the NI 43-101 compliant technical report for Lalor dated October 8, 2009 and the company’s September 22, 2009, October 8, 2009 and December 17, 2009 news releases, available at www.SEDAR.com.

The Lalor deposit is approximately 15 kilometers from HudBay’s concentrator in Snow Lake, Manitoba, an area that is a significant past producer of gold. The ongoing evaluation, exploration and development of the Lalor deposit is a primary focus for the company, as the Lalor deposit could be of significant financial benefit to HudBay and support substantial long term activity in the Snow Lake area.


EM geophysics on VMS Vetures Inc. projects in Manitoba

Posted by on Monday, 22 February, 2010

The RN-10-05 hole, targeting an airborne geophysical survey (VTEM) anomaly, has been started, with an anticipated hole length of 500 m. These holes are testing targets in the Magoo Lake area, located approximately 1.5 km northwest of the Discovery Zone. Five additional holes ranging in depth between 325 m and 700 m are planned and will target VTEM, DeepEM surface survey and Borehole Pulse EM geophysical survey anomalies. Total drilling anticipated in this program is estimated to be 3,000 m.

Hole RN-10-10 will target a large conductive modeled plate near the recently completed drilling on the Tower Zone, and is planned to be 700 m in length. Company geologists have recognized the potential extension of the Discovery Zone rhyolite in this area. This target will be drilled later in the program, as it can be drilled from ground that is accessible all year round.

Deep penetrating ground geophysical surveys have identified new conductive targets northeast and along strike of the Tower Zone over a strike length of approximately 1 km. These are untested anomalies and deeper than any previously drilled in the northeast Tower area. Three holes, each testing a new anomaly, will be drilled. Anomalies have been modeled below 300 m from surface. Hole RN-10-09 will test the deepest target in the area and has a planned length of 700 m.

drill holes RN-10-07 and RN-10-08 will test geophysical conductors located in the vicinity of an historical drill hole which reported multiple intervals of disseminated, stringer and near solid to solid sulphide, with anomalous copper, zinc and silver values in altered volcanic rock. Reprocessed historical geophysical survey data, including bore hole survey data, has been merged with VMS VTEM airborne survey data and more recent ground deep EM survey results.

These three drill targets, located on mining claim P6805E, are spatially associated with the Company’s recent surface pulse electromagnetic survey that outlined several highly conductive plates directly associated with, or flanking, a magnetic response.

A VTEM anomaly with a coincident magnetic high defined on mining claim P5643E will also be drilled. It is located approximately 2 km east-northeast of the Phase 1 Tower Zone drilling area.  This target has a lateral extent of over 700 m and based on modeling of electromagnetic data is suggestive of stacked conductive zones. Historical drilling results in the area have reported strongly altered volcanic rock and sulphide mineralization with anomalous copper and zinc. The geological setting of these conductors is interpreted to be very favorable for hosting base metal massive sulphide-type deposits of the Flin Flon-Snow Lake belt.

Drilling on mining claim P1019F will target two separate VTEM anomalies near Magoo Lake.  Historical work completed by Noranda Exploration in this region outlined highly anomalous copper and zinc values in a highly chlorite-altered volcanic host rock. This geological setting is also favorable for the formation of base metal massive sulphide mineralization and two holes are planned to test the targets.


CSAMT for gold in Idaho

Posted by on Wednesday, 17 February, 2010

The Controlled-Source Audio-Frequency Magnetotellurics (CSAMT) survey was conducted by Zonge Geosciences Inc. for Otis Gold Corp., between October 19th and October 27th 2009 and consisted of data acquisition from six N45E-oriented survey lines for a total of 8.5 line-kilometers of coverage. Detailed geophysical interpretation of the CSAMT survey data was conducted by James L. Wright of J. L. Wright Geophysics, Spring Creek, Nevada, during the latter half of December 2009.

Otis Gold Corp. announces the results of a recent CSAMT geophysical survey that indicates the presence of numerous sizeable and geologically significant resistivity anomalies underlying the Dog Bone Ridge gold target area located at the Kilgore Gold Project, Clark County, Idaho. The target area, which has only been minimally tested by historic drilling, is located approximately 1,200 meters southwest of the known Kilgore gold deposit and comprises most of the core of the larger epithermal system containing the deposit (see http://www.otisgold.com/news/06-10-2008/ and http://www.otisgold.com/blog/gold-intercepts-at-kilgore/). Of the five CSAMT anomalies detected by the survey, only three have been initially tested by historic drilling, with all drill holes in these three anomalies containing significant intercepts of gold mineralization.

Based on the lack of drilling and the fact that the anomalies are sizeable (upwards of 1,200 meters in length), a 2,000-meter, 6-hole drill program is planned to test the highest priority anomalies and offset some of the known historic drill-hole intercepts during the 2010 field season. This drilling is part of a larger 8,000-meter drill program planned for the Kilgore Gold Project in 2010.

The Dog Bone Ridge gold target comprises an extensive area of 242 hectares mostly overlain by an apron of Pliocene-age hot-spring sinter and explosion breccia that caps lithic tuff, the same rock unit that hosts the Company’s nearby Kilgore gold deposit. Of the three CSAMT anomalies associated with historic and significant drill-hole intercepts, the most northerly (Target C1) coincides with Kilgore Gold Company drill holes KG04-02 containing 51.8 m @ 1.25 grams/tonne (“g/t”) gold (“Au”) and KG06-01 with 12.6 m @ 1.57 g/t Au. Within the hole KG04-02 intercept a higher-grade intercept of 3.1 m @ 15.9 g/t Au was reported that coincides directly with the slightly higher resistive core of the anomaly, possibly reflecting a silicified structure. The second, or central, CSAMT anomaly (Target D3) associated with historic drill-hole intercepts coincides with Echo Bay core hole 96EKC-178 that contains 99.4 m @ 0.428 g/t Au and further contains within this intercept higher grade intercepts of 4.6 m @ 2.57 g/t Au, 10.7 m @ 1.51 g/t Au, and 3.1 m @ 2.57 g/t Au. Gold mineralization in these holes is hosted within silicified lithic tuff.


The survey was conducted using a 50-meter electric-field receiver dipole in spreads consisting of four electric-field dipoles with a magnetic-field antenna located in the center of the spread. The data was acquired in the broadside mode of operation with the electric-field dipoles oriented along the survey line and parallel to the transmitter dipole. The magnetic antenna was oriented perpendicular to the survey line. One CSAMT transmitter of a grounded dipole configuration was used for the survey. The survey was conducted to search for low to moderate resistivity bodies containing higher resistivity cores near or associated with structures that may have acted as conduits for gold mineralization.

A detailed location map of the CSAMT survey grid lines and resultant anomalies, along with the historic drill-hole intercepts associated with these targets, can be found on the Otis website at http://www.otisgold.com/projects/kilgore . Although a few additional and widely scattered historic holes were drilled in the Dog Bone Ridge target area, they either were not drilled deep enough to reach the newly discovered CSAMT anomalies or they were angled away from and/or off the flanks of them, missing them completely.


DC resistivity and IP survey over Tesoro Gold Project in Peru

Posted by on Friday, 12 February, 2010

Everyone can look at the results of Titan-24 survey over the Gold Project.

Maps direct link http://www.steliasmines.com/titan24/images.pdf and interpretation model sections http://steliasmines.com/titan24/titan2d_xsectionFigures.pdf

St. Elias Mines Ltd. is owner of the Tesoro Gold Property located in Peru.  The Property covers approximately 1,700ha and is located in the Acari District within the prolific Nazca-Ocoño gold belt of southwestern Peru.  The Nazca-Ocoño gold belt is a 300km x 30km belt paralleling the Pacific coast of southwestern Peru.  Gold is associated with disseminated sulfides that seeped into quartz veins or rock fractures within the intrusive body.  The continuity of the quartz veins and fractures is very impressive in the Nazca-Ocoño belt since these veins are often hosted within fractures and shears that show continuity along several kilometers.  To date, more than 70 gold deposits have been exploited in this region since as early as the 17th century.
The veins located immediately north of the Property are being mined by Dynacor (TSX-DYN) who published an inferred gold resource of 606,611 ounces at 16.4g/t (on only 3 of 10 veins discovered to date).  The veins located immediately south of the Property have been in continuous production since the 1970’s and have produced over 700,000 ounces to date.  These veins have been mined over a 2,000m strike length to a depth of 1,000m.  Barrick Gold has recently acquired claims that adjoin St. Elias’ Property to the south.

Since the Property acquisition in March 2004, the Company has completed a Phase I exploration program and a Phase II exploration program is ongoing.  Prior to these programs, the Property was primarily unexplored.

The Phase I program consisted of control grid emplacement, reconnaissance geological mapping and prospecting over the entire Property, detailed geological mapping and sampling of all identified veins, trenching and sampling of wider structures that flank the veins and underground sampling of the Canchete 1 vein.

Since the completion of the Phase I program, the Company has assessed and prioritized the five main concentrations of gold mineralization (“zones”), as well as, other gold bearing areas within the Property.

The Phase II exploration program is ongoing with initial exploration efforts focused on the Zona Canchete Vein #1 (“ZCV#1”).  The ZCV#1 is a first priority target and is one of eight gold-bearing quartz veins located at Zona Canchete.

The Phase II program consists of detailed geological mapping, sampling, development of additional underground workings and the collection and processing of an initial 150-200 tonne bulk sample at the ZCV#1.  This work will assist in determining the horizontal and vertical extent of the vein, as well as, the vein’s physical and gold grade characteristics.

Detailed sampling from the existing underground workings confirms that both the gold values and the vein width are getting stronger with depth.  On the 40m-level, the overall grade and continuity of the veins are improving with distance away from the winze both to the east and to the west.  For example, the average grade of the vein between 10.5m east and 22.6m east (a distance of 12.1m) is 3.0 oz/T gold.  The average grade of the vein between 20m west and 24m west is 1.36 oz/T gold over an average vein width of 31.6cm.

St. Elias Mines Ltd.  provides further information following the recently announced results from the Titan 24 Geophysical survey conducted by Quantec GeoScience Limited on the Property.


18 CONDUCTORS IDENTIFIED FROM NARRACOOTA (Australia) VTEM SURVEY

Posted by on Tuesday, 9 February, 2010
Richmond Mining Limited announces that 18 anomalies have been defined from the initial review of the VTEM survey flown to detect for bedrock conductors under cover at the Narracoota project (http://explorationgeophysics.info/?p=509) , 80 kilometres north of Meekatharra Western Australia. Preliminary analysis of the versatile time domain electromagnetic (VTEM) data has initially highlighted 18 VTEM conductors within the Narracoota Volcanics, the same rocks hosting Sandfire Resources’ DeGrussa VMS copper-gold discovery. The initial review has noted that three of the anomalies are near historic drill holes with elevated copper values in weathered rocks.
Figure below shows the electromagnetic response for the dB/dT of Channel 25 of the VTEM data and can be considered to represent conductive responses in the target rocks at 80-100 metres depth. Some initial anomalies have been selected from other VTEM channel responses, which are not represented by the Figure. Some strong responses apparent in Figure have not been selected as anomalies as they are considered to be due to the current Murchison River drainage system and its ancient tributaries or palaeochannels.