Posts Tagged gold

Geology Films

Posted by on Tuesday, 21 January, 2014
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During mineral exploration programs using geophysical methods it is highly important to know exploration models and mineralization controlling factors for proper choice of geophysical interpretation methods and approaches.

Clive Willman, geologist and film-maker, has created a series of short films covering Orogenic Gold Deposits, their formation, fluids and faults, illustrating with examples such as the Morning Star and Stawell Gold Mines in Victoria (Australia); The Metamorphic Gold Model; Gold, Faults and Fluids.

Clive presents his subject by way of interviews with leading workers in the field. Clive has worked as a geologist in both Industry and for the Geological Survey of Victoria, and brings a degree of authority to his film-making in this discipline.

Geology Films youtube.com


Airborne EM for VMS on ARMSTRONG BROOK PROJECT, NEW BRUNSWICK

Posted by on Friday, 31 May, 2013
The 2013 exploration program on the Armstrong Brook project commenced in early May. Highlights include the discovery of additional clusters of high-grade massive sulphide boulders in multiple locations (namely VMS Valley 4 & 5) and the completion of an airborne geophysical survey (VTEM) that identified intriguing anomalies in the vicinity of the primary boulder clusters.
The Armstrong Brook project comprises a number of high-grade polymetallic volcanogenic massive sulphide (VMS) prospects located in the Bathurst Mining Camp of northeastern New Brunswick, situated approximately 15 kilometres northwest of the Brunswick No. 12 Zn-Pb-Ag-Au deposit. Brunswick No. 12 is one of the world’s premier VMS deposits, having produced zinc, lead, silver and gold over a mine life of some 60 years.
VMS Valley 4:
The new discoveries at VMS Valley 4 occur as 2 boulder clusters located approximately 300 metres apart. Samples from the first cluster (AR13-0007-1 and 2) and the second cluster (AR13-0008-1 through 6), have returned high-grade mineralization with combined zinc+lead average assays of 13.68% and 10.33%, respectively, with impressive precious-metals as high as 459 grams per tonne silver and 1.07 grams per tonne gold. Complete assay results from the new boulder discoveries .
VMS Valley 5:
Additional prospecting has been completed in the vicinity of a recently discovered cluster of boulders located in the northwestern portion of the property. This work resulted in the discovery of 5 massive sulphide boulders in the vicinity of a discovery reported earlier in 2013, that yielded high-grade results with assays of up to 13.07% Zn, 6.07% Pb, 0.76% Cu, 251 g/t Ag and 0.66 g/t Au (see Wolfden news release dated March 20, 2013). These discoveries occur over an intermittent strike length of close to 700 metres and occur coincident to a significant geophysical anomaly that was identified in the recently completed VTEM airborne geophysical survey.
Assays remain pending for the new massive boulders from VMS Valley 5.
Preliminary results obtained from the VTEM survey indicate that the massive sulphide boulders are intimately associated with the eastern margin of a strong electromagnetic anomaly (EM conductor). This hook-shaped conductor attains a strike length of approximately 2 kilometres (see Image 1). Additionally, the cluster of massive sulphide boulders at VMS Valley 5 is centred within a broad circular-shaped magnetic high (total magnetic intensity) that has a radius of approximately 2.5 kilometres (see Image 2). Clearly, this anomaly requires detailed follow-up in the way of ground geophysical surveys prior to diamond drilling.

The 2013 exploration program on the Armstrong Brook project commenced in early May. Highlights include the discovery of additional clusters of high-grade massive sulphide boulders in multiple locations (namely VMS Valley 4 & 5) and the completion of an airborne geophysical survey (VTEM) that identified intriguing anomalies in the vicinity of the primary boulder clusters.The Armstrong Brook project comprises a number of high-grade polymetallic volcanogenic massive sulphide (VMS) prospects located in the Bathurst Mining Camp of northeastern New Brunswick, situated approximately 15 kilometres northwest of the Brunswick No. 12 Zn-Pb-Ag-Au deposit. Brunswick No. 12 is one of the world’s premier VMS deposits, having produced zinc, lead, silver and gold over a mine life of some 60 years.


The results of the EM/Magnetic airborne survey over the Borden Lake Extension

Posted by on Wednesday, 29 May, 2013

Nikos Explorations Ltd. announces the results of the high-resolution VTEM (Versatile Time-Domain Electromagnetic System) and magnetic airborne survey recently completed over the Borden Lake Extension by Geotech Ltd. A total of 391 line kilometers were flown to cover the Property. The VTEM and magnetic surveys were completed in order to identify electromagnetic and magnetic anomalies that may be associated with gold mineralization and to help in the geological interpretation of this underexplored area.

Results of the surveys indicate electromagnetic and/or magnetic anomalies in four areas of interest (see map at http://nikosexplorations.com/projects/borden_lake/) described below in order of priority for follow up:

1. Several magnetic lineaments, one of which is interpreted to be a fault, intersect near the boundaries of claims 4260529 and 4260530. Such lineaments can reflect structures that are known to be important in the transport of gold-rich fluids. A north-east south-west lineament, apparent on a shaded relief map of the region, also crosses the Nikos claims in this area giving further reason for follow up.

2. Cross cutting NNW-SSE and NE-SW trending positive magnetic anomalies in claim 4259808 may represent major structures. There are also coincident weak electromagnetic anomalies that could indicate the presence of sulphide.

3. Similar cross-cutting magnetic anomalies and electromagnetic anomalies seven to eight hundred metres east of 2, but not as strong.

4. This area in the east of the property is characterised by a small positive magnetic anomaly with a coincident electromagnetic anomaly.

Nikos is planning a follow up program of mapping, sampling and prospecting to investigate the cause of the anomalies.

The Borden Lake Extension Project is located near the town of Chapleau, Ontario in an area of good infrastructure including road, rail and power. It covers an area of 1,598 hectares immediately east of Probe Mine’s Borden Lake gold property where recent exploration has defined pit constrained indicated resources of 3,686,000 ounces of gold (112.8 M tonnes grading 1.02g/t gold) and inferred resources of 625,000 ounces of gold (18.04 M tonnes grading 1.08g/t gold) at a 0.5g/t cutoff grade. This is the first discovery of significant gold in the Kapuskasing Structural Zone.

The Borden Lake Extension property covers Archean aged metamorphic rocks in an underexplored portion of the Kapuskasing Structural Zone.

Nikos is planning an airbourne geophysical survey using VTEM (versatile time domain electromagnetics) and magnetics to explore for Borden Lake type gold mineralization. Gold at Borden Lake is associated with a continuous zone of disseminated sulphide (pyrite and pyrrhotite) mineralization that gives rise to electromagnetic anomalies. The airbourne survey is expected to be completed during the first quarter of 2013.


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

Posted by 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 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.


Induced Polarization Survey in Ghana

Posted by on Saturday, 8 December, 2012

Castle Peak Mining Ltd. announces Promising Surface Sampling Results at the Dansuom Target on the Pow Concession at the Company’s Akorade Project in the Southern Ashanti Belt in Ghana, West Africa. the Reported Results Represent Approximately 25% of the Road Samples Collected to Date. Concurrently a Gradient Induced Polarization Survey and Subsequent Pole-Dipole Induced Polarization Survey was Completed in Order to Better Refine Drill Targets in the Area.

Highlights of the Sampling Include:

  • Channel POWCS008: 70.0m of 1.01 g/t Au including 26.0m of 1.76 g/t Au;
  • Channel POWCS007: 12.0m of 0.54 g/t Au;
  • Channel POWCS005: 2.0m of 2.38 g/t Au.

Highlights of the geophysical survey include several kilometer scale coincident resistivity and chargeability anomalies. Two of these significant anomalies are spatially associated with the large, 1,500m by 250m, Dansuom gold in soil anomaly defined by soil values greater than 0.2 g/t gold. (To see Figure 1: Anomalies in Dansuom Target Area, please visit the following link: http://media3.marketwire.com/docs/cap1205i.pdf)


Commenting on the results Darren Lindsay stated, “Although dealing with a less than predictable rainy season this year, we have been able to forge ahead with geophysical surveying, mapping and sampling to better determine the resource potential in the Dansuom target area. Strong geophysical anomalies coincident with our existing geochemical anomalies and new road cuts exposing vein stock works, alteration zones and contact zones are showing the promise of this exceptional target.”

Update on Regional Exploration

A total of 690 samples for multi-element analysis have been collected across the Akorade project area, with approximately 300 samples remaining to be collected across the mineral licenses at 400m by 400m spacing. To date all samples from Enyinase, Bonsaso, Kedadwen and Dompem have been collected, while mapping and sampling still continues across the POW and Great Yorkshire licenses. Mapping from these efforts is being compiled to refine our existing base map.

Geology & Mineralization

The properties are underlain by NNE-SSW Birimian Age metavolcanics and Tarkwaian metasediments of the Ashanti Belt of southwestern Ghana. These rocks are intruded by two (2) chemically distinct granitic suites which consist of: 1) Belt associated Dixcove intrusive and 2) Basin associated Cape Coast intrusions.

Deformation and metamorphism of Birimian metavolcanics and Tarkwaian metasediments (conglomerates, arkose, sandstones, siltstones and shales) are related to the Eburnean II orogeny with five (5) distinct successive deformation phases, (D1 to D5) with D2 faults and D5 reactivation for major deformation events such as strike slip, dilatants breccias, quartz veins and lens networks with pinch and swells (boudinage) hosted within faults and shear zones.

Shear zones on the property are developed within the metavolcanics. The granitoid intrusions have been accompanied by hydrothermal activity evidenced by the numerous lenses of quartz veins and veinlets within the metavolcanics. The most prominent quartz structure, in a shear zone and within the metavolcanics on the Apankrah hills, has a NE-SW orientation and dips steeply to the southeast. The quartz vein, more than 1 metre in width and strike length of more than 100 metres is shattered and pyritized in few places.

The most favourable areas of gold mineralization in the Birimian and the Tarkwaian are found:

  1. In a major shear system in early Proterozoic rocks, e.g., Prestea and Obuasi
  2. In intermediate and mafic intrusions, mainly within the “greenstone” belts
  3. In mafic volcanics in some areas, especially in the Ashanti belt, e.g., Konongo
  4. In transitional zones between the belts and the basins
  5. The banket conglomerates of the Tarkwa district
  6. Oxide and laterite occurrences

The Bonsaso concession is dominated by well-foliated Birimian metasedimentary units. Detailed geological mapping of the concession is ongoing, but is hindered by the presence of a significant weathering profile. The geology is currently thought to be similar to that of the Iduapriem mine.

Gold mineralization in the area has been observed in shallow dipping quartz stockworks and veins. Quartz veins occur as a series of shallow dipping, thin, en-echelon quartz veins up to and greater than 10 centimetres wide. The veining is also associated with a quartz-pyrite alteration halo that extended several metres into the hanging wall and foot wall of the veins. This is thought to represent the type of deposit that typically forms along regional fault and fracture systems within Ghana, whereby fractures act as pathways for Au-bearing hydrothermal fluids. Precipitation of gold and quartz then results from changes in pressure, temperature and/or wall rock interaction. Mineralization is also associated with Tarkwaian conglomerates, probably of the Banket series and representative of placer mineralization, which is analogous to that at the Iduapriem mine. 


Airborne EM in Colombian Porphyry Gold Copper Project

Posted by on Saturday, 8 December, 2012

Bellhaven Copper & Gold Inc. reports the commencement of the previously announced ZTEM (airborne electro-magnetics) survey over the entire La Mina property (1,800 Ha). The survey is also being extended to include an adjacent concession, which the Company is currently in discussions to acquire. The work is contracted to Geotech Ltd., a Canadian geophysical survey company specializing in leading edge airborne technology. The survey is designed to help refine the targets at La Mina, with a particular emphasis on the Garrucha and Cristalina target areas.

The helicopter-borne geophysical survey will result in approximately 132 line kilometres of data along east-west lines, spaced at 200 metres. The Z-TEM Electromagnetic (EM) system is an innovative technique making use of naturally occurring or passive EM fields from worldwide thunderstorm activity as the source of transmitted energy. The passive source combined with a proprietary receiver design, advanced digital electronics, and signal processing results in low noise levels, exceptional resolution, and unparalleled depth penetration. It has been used successfully to identify and map porphyry style mineral systems from Alaska to Chile.

Patrick Highsmith, Bellhaven’s CEO, commented on the program: “We are pleased to bring the ZTEM technology to the Middle Cauca Belt for the first time. It is a proven technique for porphyries in the Americas. This will enable us to prioritize existing geochemical and magnetics anomalies, including on concessions that we are in negotiations to acquire. This is a very cost effective tool that adds immediate value in an emerging mineral district such as La Mina. By sharing the mobilization and some of the administrative costs with neighboring explorers, we have made it even more cost effective.”

Discussion of ZTEM Survey

The survey is expected to identify conductive and resistive features that are associated with large mineral systems such as gold-copper porphyries from surface to considerable depth. The electromagnetic data is sensitive to sulfide minerals, as well as silicification and clay alteration; all of which are associated with the porphyry and epithermal deposits in the Middle Cauca Belt. This will be an important addition to the magnetics data that drove the initial discoveries. The EM data will advance the geologists’ knowledge of the known resource areas, particularly at depth, but it will also upgrade the targeting arsenal elsewhere on the property. This work will also enhance understanding of large structures in the district. Many of these structures have previously been mapped from both surface exposures and drill intercepts; and the Bellhaven team is focused on their importance in controlling mineralization.

The survey crew arrived on site November 17, and began conducting reconnaissance flights a few days later. They are currently flying the survey as cloud cover permits. It is expected that a total of 6 to 8 days of favorable conditions is needed to complete data collection, so the survey should be completed before the end of December.

La Mina Porphyry Gold Copper Project

La Mina is a resource stage porphyry gold-copper project located in the Middle Cauca volcano-plutonic belt in the Department of Antioquia about 45 km southwest of Medellin. The Middle Cauca belt is known to host large porphyry gold deposits such as AngloGold’s La Colosa Deposit (24 Moz Au) and Sunward Resources’ Titiribi Project (11 Moz Au).

Exploration Targets

The La Mina concession includes almost 2,000 hectares. A number of anomalous features are evident from the initial airborne magnetic survey, completed by AngloGold. As surface sampling and drilling progressed, a number of multi-faceted targets emerged. Through the first half of 2012, a total of four known mineralized porphyry systems have been identified; two of these deposits are host to NI 43-101 compliant inferred mineral resources. The two remaining known porphyries will be the focus of future drilling, meant to advance these prospects to the resource stage as well. The exploration pipeline at La Mina includes a number of other targets that, based on geology, geochemistry and geophysics, have characteristics similar to porphyry or porphyry related deposits. There are at least 7 of these discrete targets undergoing additional work, but they have not yet been drilled. The figure below shows total magnetic intensity (reduced to pole) from an airborne magnetics survey. Many of the targets are identified on this map; and more detailed information is available below.


Targets Identified By Heliborne TEM Survey in Nevada

Posted by on Tuesday, 23 October, 2012

Spruce Ridge Resources Limited reports that the Company has received results of an airborne VTEM(R) time-domain electromagnetic survey over the Fletcher Junction property in the Walker Lake mining area of Nevada. Interpretation of the survey results has defined a series of targets, and diamond drilling to test selected targets is planned to start in October. The company is currently evaluating bids from drill contractors.

The Fletcher Junction property covers the northern extension of a mineralized trend that produced over 1.9 million ounces of gold in the Aurora mining district. However, bedrock on the property is covered with gravel, which is in turn covered with basaltic lavas that were erupted about 250,000 years ago from the Aurora Crater. Nevada Exploration Inc., the optionee of the property, from which Spruce Ridge can earn up to 85% interest by making $300,000 in payments, funding $2,600,000 in exploration over a 4-year period, and completing a feasibility report, recognized the potential of the property due to highly anomalous gold contents of water in natural springs seeping out from under the lava cover. Nevada Exploration Inc. has developed sophisticated sampling and analytical techniques to analyse natural waters for gold, and has used this technology to assemble a portfolio of properties on the basis of gold-in-water anomalies. In addition to the gold anomalies in water the Fletcher Junction property, mineralized, angular quartz float was found on the gravel terrace along the western edge of the lavas, which yielded assays of up to 90.5 grams per tonne (g/t) of gold and 324 g/t silver. A limited amount of reverse-circulation drilling by Nevada Exploration has intersected bedrock and confirmed the presence of alteration and anomalous gold, silver and pathfinder element values.

The first target to be drill tested is an interpreted paleo-hill, or bedrock high that appears to rise above the gravel layer, although it is still covered by lava. It has clearly been resistant to erosion, possibly due to silicification, which may be related to mineralizing processes. A 600 metre (2,000 feet) deep inclined diamond drill hole will test this intriguing target.

Another result of interpreting the VTEM(R) survey that was unexpected is that there is a continuous resistivity low in the bedrock running in a northerly direction from the Aurora mining district all the way through the Fletcher Junction property. It was initially anticipated that Fletcher Junction might be host to a mineralized cluster similar to that at the Aurora mining district. However, it now appears, on the basis of the geophysics, that there may be one continuous alteration system extending over 11 kilometres from the Aurora mining area to the north end of the Fletcher Junction property. Drill testing will of course be necessary to determine if this interpreted alteration system is associated with mineralization.


The Magnetic/VLF survey in Newfoundland

Posted by on Thursday, 18 October, 2012
Silver Spruce Completes Airborne Survey and Receives Check Assays for the Big Easy Gold/Silver Property, Eastern Newfoundland


Silver Spruce Resources Inc. announces that the high resolution magnetic / VLF-EM airborne survey has been completed and preliminary results received on the road-accessible, Big Easy gold/silver property in eastern Newfoundland. The Big Easy prospect is a large, altered (silicified) system that covers an area of approximately 1.7 kilometres by up to 300 metres wide.   The prospect was drilled in 2011 and 2012 — a total of 12 holes over a 1.2 km strike length, giving significant gold (Au) and silver (Ag) values in a number of the drill holes (news releases September 18, 2012, August 16, 2012 and June 7, 2011).

Airborne Survey
The airborne, high resolution magnetic / VLF-EM survey was carried out in late September by Terraquest Ltd. of Mississauga, ON.    The aim of the survey was to improve the understanding of the geological setting of the area by a lithological/structural interpretation based on the survey results, drilling and surface geology.

The preliminary magnetic data shows a broad, NNE (025 degrees) magnetic high trending through the main portion of the claim group with narrow linear, NNE trending magnetic lows within the overall magnetic high.   The magnetic  lows are offset by linear zones and possible dikes / faults, trending NNW (340 degrees). A sinuous magnetic  low joins the BE and ET zones, continuing to the south of the ET zone.    The preliminary VLF-EM data shows NNE and NNW trending, as well as a number of E-W to ENE-WSW trending conductive zones cutting through the property.

“We are pleased with the resolution of both the magnetic and VLF-EM data.    Based on what we are able to tie into our existing geological and structural compilation, the final results should enable us to better target continued exploration, including drilling,” states Peter Dimmell, President and CEO of Silver Spruce Resources.

Line spacing was 200 m in the known mineralized areas (Big Easy and ET) and 300 m over the rest of the property, at a mean terrain clearance of approximately 70 m. The survey was flown using E-W lines and N-S tie lines for a total of 349 line km. The VLF-EM used two orthogonal receivers, with the main transmitter Cutler, ME.

Read more..


Drilling results after the Airborne EM-Mag in Northern Ireland

Posted by on Tuesday, 9 October, 2012

Dalradian Resources Inc. has received final assays from hole 12-CT-162, which was drilled to test a geochemical anomaly from a recently released survey. The hole is located approximately 1700 metres along trend from the Company’s wholly owned Curraghinalt deposit in Northern Ireland.

From previous news about the property:

The recently-completed 1,034.3 line kilometre VTEM and magnetics survey that was flown along 10 km of the Curraghinalt Trend, which is both over and along strike from the Curraghinalt gold deposit. The tightly spaced survey (50m line spacing) will assist with targeting further drilling based on an improved three dimensional understanding of the geology, structure and alteration zones associated with mineralization.

The Curraghinalt Deposit is a mesothermal gold system consisting of a series of approximately east-west trending gold bearing high grade narrow veins in meta-sedimentary host rocks.


Airborne EM Anomalies Confirmed by Drilling in Western Australia

Posted by on Friday, 7 September, 2012
Rox Resources Limited reports the results from Rotary Air Blast (RAB) and Aircore (AC) drilling completed in July 2012 at the Mt Fisher gold-nickel project, 220km north of Leonora in Western Australia.
The 6,517m drilling program, consisting of 85 RAB and 48 AC holes, was designed to test a combination of regional structural and geophysical targets under cover, as well as some strong geochemical gold anomalies.
Rox Managing Director, Mr Ian Mulholland commented on the results, saying that it was encouraging to extend the Dam and Dirks anomalies further, and to also identify a strong nickel sulphide target where there had been no previous drilling.
AC drilling at Fisher East targeted both gold and nickel mineralisation on the NW-SE trending, east-dipping mafic-ultramafic greenstone belt. This included two 1km and 1.7km traverses of 80m spaced angled drill holes across the entire width of the belt where no drilling had been completed previously.
This drilling successfully confirmed prospective ultramafic margins and located several nickel-copper geochemical anomalies. One of the anomalies corresponds with a VTEM conductor and presents a strong target for nickel sulphide mineralisation at depth to be tested with RC drilling.
“We’ve got a number of strong gold targets still to follow up at Mt Fisher, and our belief that the Mt Fisher Greenstone belt has the potential to host at least a million ounces is still strong. In addition, the nickel sulphide target is intriguing, with the geochemical anomaly lying over the VTEM anomaly in a good geological position”, Mr Mulholland said.
AC drilling at the Dirks Prospect intersected mineralisation in MFAC001 (4m @ 0.54g/t Au from 54m, and 5m @ 0.25g/t from 76m to EOH) and MFAC004 (8m @ 0.40g/t from 48m). This line of infill drilling is located approximately 180m north of mineralisation in MFA254 (2m @ 13.7g/t Au from 54m). The results show that mineralisation at Dirks is continuous along strike, and RC drilling is being designed to test this anomaly at depth.

RAB drilling at Dam South was designed to broadly test a series of VTEM anomalies situated along strike from mineralisation to the north. Significant gold assays returned included 12m @ 0.24g/t Au from 44m in hole MFRB037, and 4m @ 0.27g/t Au from 16m in hole MFRB043. These results confirm the potential source of the VTEM anomaly and warrant further drill testing.

Read more..

Mt Fisher Gold Project (100%)
Rox has acquired a 615 km2 tenement package which dominates the highly prospective Mt Fisher Greenstone Belt, 40km to the east of the prolific Yandal greenstone belt and 100km east of the main Wiluna greenstone belt.
Rox has an Option to acquire a further area of 170 km2, including the Mt Fisher gold mine which has previously produced 30,000 ounces of gold, and shares similar geological characteristics with neighbouring greenstone belts that host several multi-million ounce gold deposits. Much of the Mt Fisher Greenstone Belt remains significantly under-explored and Rox is focusing on a number of options to establish near-term gold production at Mt Fisher.

The New High Grade Epithermal Gold Deposit in British Colombia

Posted by on Wednesday, 5 September, 2012

Seabridge Gold announces that exploration drilling this summer on its 100%-owned KSM Project in northwestern British Columbia has discovered an epithermal style of gold occurrence which contains significant widths of higher gold grades including narrow veins with the highest gold grades found at the project to date. The claim blocks are in the Iskut-Stikine region in British Columbia, approximately 20 kilometres southeast of the Eskay Creek Mine.

Geophysics

Induced polarization surveying was utilized as final confirmation, prior to drilling, that the sulfide or mineralizing system at KSM was of a world class scale and could satisfy Noranda’s minimum exploration criteria.   A pole – dipole IP survey was conducted on 7 widely spaced lines and was designed for the best combination of depth penetration and resolution. It employed an “expander array”, consisting of four 100m receiver dipoles, two 200 m receiver dipoles and finally two 300 m receiver dipoles for a total array length of 1500 m.  The widespread strong chargeability and low resistivity responses detected in rocks beneath the Sulphurets thrust fault satisfactorily demonstrate the extent of sulfide bearing, altered rocks.  However, as is typical of the IP method, it does not differentiate between areas of strong pyrite but weak chalcopyrite (copper sulfide) mineralization or those with both pyrite and chalcopyrite.

On the contiguous with Seabridge’s KSM property Treaty Creek property (American Creek Res.) magnetotelluric survey carried out in the summer of 2011 (Quantec Geoscience). The survey revealed a large conductive body at depth which extends upward to the surface and can be mapped between MT sites 214 and 216.  This area contains gossanous outcrops along with surface mineralization and also includes the previously explored Orpiment zone.  The survey also shows a more prominent feeder extending over 3km from the large conductive body at depth.  This feeder is approximately 750m wide and extends to the location of the Copper Belle zone where another large conductive body (less than 200ohm-m) appears on the survey.  The north east tip of Copper Belle, a bulk-tonnage type gold-copper-molybdenum porphyry, appears to be located at the north east tip of this lowly resistive anomaly. Details..

Drilling

KSM has proven and probable reserves totaling 38.2 million ounces of gold and 10 billion pounds of copper in four very large deposits which have an average grade of 0.55 grams per tonne of gold, 0.21% copper and 2.74 grams per tonne of silver. The new discovery has intercepts of gold and silver grades that are substantially higher. Drill hole C-12-01 encountered epithermal style mineralization in an entirely new zone at shallow depth and low elevation, called the Camp zone. This hole returned two 2 meter intercepts grading above 8 grams of gold per tonne (greater than 0.25 ounces of gold per tonne). A second hole, C-12-02, drilled 400 meters southeast of C-12-01, intersected 22.0 meters averaging 8.94 grams per tonne of gold and 41.6 grams per tonne of silver. This hole returned a 2 meter intercept of 66.7 grams of gold per tonne (more than 2 ounces per tonne) and 287 grams per tonne of silver (nearly 10 ounces per tonne). A third hole into this zone, C-12-03 drilled 900 meters to the northeast of C-12-02, returned 98.7 meters at an average gold grade of 2.11 grams per tonne including 17.7 meters averaging 4.41 grams per tonne of gold and an additional 6.0 meter intercept averaging 6.24 grams of gold per tonne.

Seabridge Gold CEO Rudi Fronk said the new discovery appears to have the potential to make a significant contribution to KSM’s already robust economics. “Obviously, we are at a very early stage in the discovery process. However, the Camp zone is readily accessible and has the highest gold grades found to date. All three holes into this new zone found excellent gold values,” he said.

“This is not the target we were looking for in this year’s program…we were exploring to find a high grade, copper-rich core and that work continues with encouraging results. Our original assumption was that neighboring Pretium Gold had the higher grade, epithermal (top) portion of the very large gold-copper porphyry system we see at KSM and that our property would probably host the high grade copper core of the entire complex at depth. The new Camp zone appears to be part of an epithermal system with chemistry similar to that found nearby at Pretium’s extraordinary Brucejack deposit. We intend to complete another six holes into the Camp zone this drill season to establish the orientation of this new discovery. At the same time, we continue to pursue several promising copper core zone targets. An additional exploration drill rig has been mobilized to site, bringing the total to three,” Fronk said.

read more..


Results of an Airborne Geophysical Survey in Tanzania

Posted by 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.


Ground Geophysics for Brownell Lake Gold Property (Saskatchewan)

Posted by on Thursday, 19 July, 2012

Galaxy Graphite Corp. announces that it has commenced field work on its Brownell Lake gold property, located approximately 100 km E of  La Ronge. The work program will include line cutting, ground geophysics (VLF/Mag), mapping, prospecting and soil sampling.  This work will be managed by Mackevoy Geosciences Ltd of Williams Lake, BC.  This Phase 1 work program is expected to be completed by the end of July, 2012, with a Phase 2 field program in early September 2012 to follow up on the results of the current program.

Brownell Lake Property, Saskatchewan

An NI43-101 Technical Report was prepared for property vendor in October 2009.  This report can be viewed on Sedar (www.sedar.com) under the company’s profile. The report concluded that the Brownell Lake project is at an early exploration stage and additional ground geophysics, ground prospecting, geological mapping and geochemical sampling are warranted. Significant amounts of exploration data are available from the Saskatchewan Government and the digitization and compilation into a GIS database will greatly enhance the framework and help focus further work. Subsequent to compilation and further ground work, additional diamond drilling was recommended to assess continuity of mineralization tested in 2007 and 2008 and to evaluate the other anomalous zones in the area.
The Olsen Lake showing has been the main subject of exploration by 101053292 Sask Ltd. receiving preliminary drilling in 2007. Follow up drilling in 2008 successfully tested lateral and down dip extensions of the first promising drill hole, DDH BL-1. In total, 5 holes totaling 894.5 m have been drilled on the Brownell Lake Property. The drilling results include mineralized zones correlating between drill holes, assay values up to 13 g/t Au over 0.65 m (DDH BL-4), composite continuous assay values of up to 1.52 g/t Au over 11.6 m (DDH BL-4), and discontinuous composite assay values of 0.56 g/t over 17.3 m (DDH BL-2).


Drill Program after Interpretation of Airborne EM Data on Flin-Flon (Manitoba)

Posted by on Friday, 13 July, 2012

Foran Mining Corporation announces the results of a spring 2012 regional drill program (the “Regional Program”) on its  McIlvenna Bay and Bigstone properties.

The Regional Program consisted of a total of eight diamond drill holes (2,387 metres), with four holes drilled on each of the two properties. The Regional Program was designed as an initial test of the numerous electromagnetic conductors identified from the interpretation of a helicopter-borne, versatile time domain magnetic and electromagnetic (“VTEM”) survey completed by Foran in fall 2011 (see Foran news release dated November 23, 2011).

Results for the Regional Program were positive, with sulphide conductors intersected on both properties. Pyrrhotite-dominant volcanogenic massive sulphide (“VMS”) style mineralization and associated alteration was encountered, with minor amounts of base metal sulphides and locally elevated concentrations of zinc, copper, and gold.

Patrick Soares, President and CEO of Foran commented: “Encountering VMS-style mineralization and alteration in this limited initial test of conductors is very encouraging. The Regional Program was both a technical success and an endorsement of these methods towards the discovery of new zones of VMS mineralization in Foran’s large and highly prospective landholdings surrounding our 100% owned McIlvenna Bay VMS deposit.”

The McIlvenna Bay and Bigstone properties are located in east central Saskatchewan. The 20,382 hectare (“ha”) McIlvenna Bay property, which hosts Foran’s McIlvenna Bay deposit, is located 65 kilometres (“km”) west of Flin Flon, Manitoba. The 11,126 ha Bigstone property is located a further 25 km to the west. Past exploration by previous operators on the Bigstone property has outlined zones of both copper- and zinc-rich VMS mineralization, including a 2002 historic mineral resource at the Bigstone deposit.

The Regional Program was conducted between April 9, and May 5, 2012, following the successful completion of a winter 2012 drill program on the McIlvenna Bay deposit (see Foran news release dated June 4, 2012). The Regional Program was helicopter-supported due to unseasonably warm weather though the winter and spring.

McIlvenna Bay Property

Four holes (1,211 metres) were drilled to test VTEM conductors on the McIlvenna Bay property; the holes were collared 1 to 7 km away from Foran’s McIlvenna Bay deposit (Figure 1).

To view Figure 1: Location of Regional Program drill holes, please visit the following link:http://media3.marketwire.com/docs/FOMF1.pdf.

Drill holes MR-12-01 and -02 targeted stratigraphically discordant VTEM conductors up to 2 km east and southeast of the McIlvenna Bay deposit, within interpreted hangingwall stratigraphy. Both holes intersected iron sulphide-bearing iron formation and felsic tuffs with trace amounts of sphalerite and chalcopyrite. No significant assay results were obtained (Table 1).

Drill holes MR-12-03 and -04 targeted north-trending conductors with coincident magnetic highs. The holes were collared 830 metres apart and approximately 7 km southwest of the McIlvenna Bay deposit. Volcanic stratigraphy intersected in both holes appears to be upright, west facing and bimodal-pyroclastic in character. Intervals of iron sulphide-mineralized carbonaceous mudstone, siliceous exhalite and attendant silica-carbonate-amphibole+/-magnetite alteration were intersected in both drill holes. Sulphide mineralization consists principally of banded and brecciated pyrrhotite with local semi-massive (up to 35%) sulphide. These intervals contained lesser amounts of pyrite, with trace amounts of sphalerite and chalcopyrite. Locally elevated gold concentrations in the sulphide zones ranged up to 870 ppb Au (0.87 g/t Au) over 0.73 metres in MR-12-03, within a broader interval averaging 236 ppb Au (0.24 g/t Au) over 8.17 metres.

Bigstone Property

Drilling on the Bigstone property consisted of four holes (1,176 metres) targeting three north-south oriented VTEM conductor trends in the northern part of the property. This target area was previously tested in the 1970’s and 1980’s by predecessor companies and referred to historically as the Freeport Zone.

Regional Program drilling intersected iron sulphide-rich mineralized horizons in three of the four holes drilled, all of which contained traces amounts of sphalerite and chalcopyrite. Sulphide host rocks are felsic volcanic, within intermediate to mafic dominated volcanic stratigraphy.

Drill hole BG-12-01 tested the westernmost conductor trend. No significant base metal sulphide mineralization was noted in this hole, which ended in granite at a downhole depth of 324 metres.

Approximately 170 metres northeast of BG-12-01, drill holes BG-12-02 and BG-12-03 were drilled from a common collar location. These holes intersected several massive pyrrhotite-dominant sulphide horizons, each approximately 1 metre in downhole thickness, within an overall iron sulphide-mineralized felsic volcanic package ranging from 12 to 23 metres true thickness. In holes BG-12-02 and BG-12-03, iron sulphide mineralization began at downhole depths of 158.82 metres and 216.79 metres, respectively, and contained trace to 1% sphalerite-chalcopyrite within massive, semi-massive and finely laminated to disseminated pyrrhotite and lesser pyrite. Massive sulphides occur as a fine- to medium-grained matrix to rounded and sub-rounded felsic volcanic clasts. Footwall alteration to this zone is moderate intensity fracture- and foliation-controlled black chlorite.

Drill hole BG-12-04 intersected approximately 2 metres of semi-massive to massive iron sulphide starting at a downhole depth of 198.9 metres. Rounded felsic volcanic clasts occur in massive pyrrhotite with lesser pyrite and trace to 1% sphalerite-chalcopyrite.

Past exploration by previous operators on the Bigstone property has outlined zones of both copper- and zinc-rich VMS mineralization. In 2002, Aur Resources Inc. outlined a mineral resource at the Bigstone deposit in the southern part of the property, with 1.45 million tonnes grading 2.90% Cu in a copper-rich zone and 308,000 tonnes grading 11.2% Zn in a separate zinc-rich zone. The Bigstone deposit mineral resource is historic and the Company is not treating it as current; Foran has not done sufficient work to classify it as a current resource estimate. A program of drill hole re-surveying, re-logging and drill core QAQC is required to qualify the historic resource and identify areas for expansion through exploration drilling. The Bigstone property is subject to a back-in held by Teck Resources Ltd.


Completion of Geophysical Survey at King Solomon Dome Property (Yukon)

Posted by on Saturday, 30 June, 2012

Kestrel Gold Inc.  announces the completion of a geophysical survey at Kestrel’s King Solomon Dome Property south of Dawson City, in the Yukon Territory (“KSD“).

The Survey is intended to map the geophysical properties of resistivity and chargeability of the subsurface down to a depth of 500 metres. SJ Geophysics Ltd. of Delta, British Columbia using their new Volterra-3DIP system in conjunction with a magnetometer survey over a grid approximately 1.6 km by 1.6 km, has been focusing on the area encompassing the Sheba and Mitchell workings which lie within a large gold geochemical soil anomaly. This second phase of deeper geophysical work is envisaged to give a much clearer (3D) picture of the morphology of structures, contrasting lithologies and additional potential drill targets at greater depths. The Survey follows on from the first phase of geophysical work conducted in 2011 which was successful in outlining a large chargeable IP anomaly centred in the area around the Sheba showing and trending towards the Mitchell Shaft to the north over a distance of approximately 1.2 km open along strike and extending to depth.

William Taylor, the Vice President Exploration of Kestrel comments: “We know from work done to date the importance of regional scale NNW trending D4 structures at KSD in relation to Klondike gold mineralization. This survey will help us better understand the other factors that have concentrated the gold and other path finder elements in this particular area where the signatures are so relatively high.”

A number of drill targets have already been outlined at KSD and the results of the Survey are anticipated to be received in advance of the Corporation’s planned 2012 diamond drill program.

King Solomon Dome is a 4050 foot peak in the Yukon Territory of Canada.  It is believed to be the source of the gold fields that sparked the Klondike Gold Rush in the early 1900’s (link to Yukon Gold Mining – Klondike).  Kestrel has an option to earn 100% interest in four individual properties in the King Solomon Dome. The option will require Kestrel to make staged payments totaling $920k over a period of 4 years, issue 150k shares and fund exploration expenses of up to $100k.

Geology

Previous soil sampling within the project area claims had encountered 3 main anomalous zones, each at least 1.0km in length and varying from 25 metres to 400 metres in width, with soil geochemical values of up to 965 ppb Au associated with occasional highly anomalous arsenic, antimony and lead. This metal signature is common to White Gold area mineralized zones such as the Golden Saddle and Arc deposits held by Kinross Gold (formerly Underworld Resources). Recent trenching of these anomalies has encountered mineralization including narrow high-grade zones often containing visible gold with grades ranging up to 14,700 ppb (14.7g/t) Au over 1.9m, 8100 ppb Au over 1.9m and 40,670 ppb Au (40.7 g/t) over 0.7m; as well as broad intervals with grades such as 1622 ppb (1.6 g/t) Au over 8.4m and 2242 ppb (2.2 g/t) Au over 18.2m.


TEM plate modeling for KAN property in the Labrador

Posted by on Thursday, 28 June, 2012

Rio Silver Inc. has published The Results of EMIT Maxwell Plate Modeling and detail Resistivity Depth Imaging of VTEM anomalies for the KAN Gold Extension Project. The VTEM anomalies have been modeled by Geotech Ltd.

http://www.riosilverinc.com/pdfs/11198-KAN%20Expansion-MaxwellModels.pdf

The Results of EMIT Maxwell Plate Modeling of VTEM anomalies for theKAN Gold Extension Project

________________________

The Kan project is located in the Labrador Trough of Northern Quebec, approximately 85km South West of Kuujjuag, Nunavik Territory.

Early exploration on the property was initiated by Cominco Ltd. (Cominco) in 1965 with the discovery of a massive
sulphide showing located under a sphalerite-galena-pyrite, glacial boulder train. Limited drilling by Cominco at the
time failed to define the extensions of this sedimentary exhalative (Sedex) base metal showing. Work resumed in
1993-1996 by Kennecott Canada Inc. (Kennecott) and then in 1999-2000, Noranda Exploration Ltd. (Noranda).
Kennecott discovered two more massive sulphide boulder trains located within 1.5km of the original discovery. The
average grade of 28 of these boulders is 7.7% lead, 9.7% zinc, 276g/t silver and 0.65g/t gold. Dimensions of some of
these boulders reach more than 2 meters across and their angular shapes point to local sources.

While Sedex base metals were the focus of exploration work on the Kan Property, several gold showings were
recorded in the historic assessment reports. The first gold occurrences were located during a Labrador Trough
precious metals reconnaissance campaign done by Noranda in 1987-88. Six grab samples reporting grades from
1.10g/t gold to 9.20 g/t gold were collected from an iron formation ridge located 1.5km east of the Kan showing.
There was no follow-up done on these gold results and this area will be a priority target for Rio Silver.

In 1993, during base metal reconnaissance work, Kennecott discovered a quartz vein cross-cutting iron formations
located 7km NW of the Kan showing. This vein (the Ferricrete showing) reported surface channel assays of up to
280.8g/t gold over 0.30m and 143.4 g/t gold over 0.40m. Four holes were drilled under the showing to test both the
vein and the host iron formations. Results from the drilling are reported below:

K94-11: 4.14g/t Au over 3.8m
K94-12: 6.29g/t Au over 3m and 1.24g/t Au over 2m
K94-21: 5.07g/t Au over 6m and 3.64g/t Au over 4m
K94-22: 4.01g/t Au over 1m and 1.64g/t over 1m.