Posts Tagged VLF

Magnetic/VLF survey in the Chibougamau area in Quebec

Posted by on Tuesday, 6 May, 2014

 Stellar AfricaGold Inc. announces that an airborne Magnetic/VLF survey has been completed over the Opawica and Philibert I properties in the Chibougamau area in Quebec. An exhaustive interpretation done by MB Geosolutions inc., has outlined (8) gold and (3) Cu-rich polymetallic exploration targets. The interpretation was done by analysing current survey data in association to existing INPUT EM combined with Cu till anomalies from public data sources. Two of the copper targets are located in the Opawica South Block and one in the Philibert I Block. Four (4) gold targets are located in the Opawica North Block, three (3) in Opawica South Block and one (1) target in Philibert I Block.

The Company is now planning the spring/summer reconnaissance over Opawica and Philibert I property with an emphasis on the evaluation and sampling of the targeted area. A ground IP survey should be recommended to better outline the targets that are not outcropping. Trenching and drilling should follow during summer program over selected targets.

About OPAWICA and Philibert I Property:

The Opawica and Philibert 1 properties are located in the Chibougamau-Chapais mining camp within the Tomagold/Iamgold-Vanstar-SOQUEM working area which is to date the most active exploration camp in Quebec. Among the most important gold occurrences reported in the area, we note SOQUEM Meston Lake deposit (1.2 MT @ 6.25 g/t Au), SOQUEM Philibert deposit (1.3 MT @ 5.32 g/t Au), as well as numerous high grade drill and channel sampling reported by Tomagold, Vanstar, Murgor and SOQUEM as well as the former Joe Mann gold mine that produced over 1.0 million ounces of gold.

The OPAWICA Property consists of three blocks totalling 80 mining cells recently acquired by Stellar in the area of the new Liam gold discovery of the Nelligan Project of Vanstar. The Philibert 1 property is composed of one block of four mining cells and is part of the same area.

The Philibert-I showing was discovered in 1983 by prospection, and consists of a gold mineralization associated with quartz-tourmaline-sulphides veins. Historical exploration reported grades of 31.6 g/t Au and 2.54 g/t Ag in channel sampling across exposed quartz veins, and of 18.66 g/t Au over 0.6-metre cuts in a drill hole.


Geophysical Survey at Las Morras Project (Spain)

Posted by on Friday, 20 December, 2013

Emerita Gold Corp.  announces the completion of geophysical exploration programs at its 100% owned Las Morras Property in the Extremadura Region of western Spain. The geophysical surveys consisted of Very Low Frequency (VLF), Induced Polarization (IP) and Electrical Resistivity Tomagraphy (ERT) surveys over the Central and Northwest target areas. The surveys identified several anomalies that are interpreted to represent shear zone structures coincident with the previously identified gold geochemical anomalies (see news releases dated August 29 and April 8, 2013). These interpreted structures will be evaluated as potential bedrock sources for the gold identified in the soils over the geophysical features by trenching and, if appropriate, drilling.

Background

As previously reported, geochemical surveys have identified two areas with strong gold anomalies referred to as the Central and the Northwestern areas . In the Central area two gold geochemical anomalies have been identified, both approximately 300 meters wide and extending in an east-west direction 500 meters and 800 meters, respectively. These anomalies extend beyond the survey limits to the east and also to the west (see press release dated April 8, 2013).

The Northwestern area is characterized by a single gold anomaly (Figure 3) that extends approximately 700 meters long and over 100 meters wide in an east-west direction. This anomaly also extends beyond the limits of the survey area to the west and to the east (see press release dated August 29, 2013).

Geological mapping indicates that these gold anomalies are underlain by zones of strong shearing in bedrock. The shear zones are developed within the Precambrian Schist-Greywacke Complex (SGC) and are characterized by a zone of high strain and local quartz-gold veining, with predominantly a east-west direction. Outcrop is limited and the geophysical surveys are designed to improve the targeting of the follow up program.

Geophysical Surveys

Geophysical surveys (VLF, IP and ERT) were carried out during October and November 2013, with interpretation completed in mid December, to identify geophysical anomalies representative of bedrock structures potentially related to mineral occurrences. The surveying was performed in both, the Northwestern area and the Central area.

Survey Results

The VLF survey consisted of 27 linear kilometres in both the Northwestern and Central areas, where measurements were performed every 10 meters. As shown in Figure 4, in the Northwestern area 8.9 linear kilometres were surveyed on 14 lines oriented north-south, with lines ranging from 350 to 1,100 meters each. In the Central area 18.1 linear kilometres were surveyed on 20 lines with north-south orientation and lines ranging from 550 to 1,100 meters each (Figure 6). The spacing between lines was determined according to the results of the geochemical campaign (see press release dated August 29, 2013), ranging from 50 to 100 meters.

The IP and ERT surveys consisted of 10.4 linear kilometres in both the Northwestern and Central areas. Both the IP and ERT surveys were measured simultaneously with the same device. The spacing between electrodes was 10 meters, which allows detection of features up to 120 meters depth. Figure 5 shows the distribution of the 11 lines of the IP and ERT surveys for the Central area, where 6.93 linear kilometres were surveyed. All lines were 630 meters in length oriented in north-south direction excepting one line with an east-northeast orientation. In the Northwestern area 5 lines were measured by IP and ERT, for 3.47 linear kilometres. The lines varied in length, from 630 to 950 meters. The spacing between lines was determined based on the results of the geochemical campaign (see press release dated August 29, 2013), ranging from 100 to 450 meters.

VLF and ERT-IP images/profiles clearly indicate several subvertical anomalous geophysical zones, characterized by resistivity-chargeability highs (i.e. 300-5,000 Ωm, and >150 ms) (Figure 6).

Geophysical Survey Interpretation

The VLF survey showed conductive anomalies in both the Northwestern and Central areas which have a predominantly east-west orientation. However, some alignments of northwest- southeast direction have also been identified. These VLF anomalies correspond to fault orientations seen in mapping and with the geochemical data.

The IP and ERT surveys allowed the identification of bodies and zones with high chargeability values in the case of IP and high/low resistivity values in the case of ERT. The survey identified bodies with a broad east-west orientation in both the Northwestern and Central areas, which are coincident with the VLF results.

The geophysical data, together with geologic information and geochemical data from the two target areas, identified features having characteristics that would be expected from a shear zone system. This shear zone system is interpreted to represent a possible source of the gold found in the area and will be the focus for follow up trenching and, if merited, drilling. The geophysical anomalies are coincident with geochemical anomalies found in the central and northwest areas. Furthermore, both the geochemical and geophysical anomalies are open along their strike, particularly to the east. The extent of the anomalous body in the Central target area, based on the geochemical and geophysical results, is 1,200 meters long, 90 meters wide with an extension to a depth of at least 120 meters based on the IP/IRT, corresponding to the bottom of the geophysical profiles. In the Northwestern target area the anomalous body is 600 meters long, 80 meters wide and continues to a depth of 100 meters, corresponding to the bottom of the geophysical profiles.

The identification of geophysical anomalous areas (i.e., faults zones and bodies of high resistivity and high chargeability) represent the prospective targets for trenching and drilling.

Survey Methods

Both electromagnetic (EM) and DC-geoelectrical methods were selected to perform the survey. These methods are well-known to be suitable for cost-effectively identifying geophysical characteristics for geological features such as shear zones with low sulphide mineral concentrations. The selected techniques were Very Low Frequency (VLF) (Klein and Lajoie, 1980), Electrical Resistivity Imaging (ERI) (Griffiths and Barker, 1993) and Induced Polarization (IP) (Keller and Frischknecht, 1966).

The VLF measuring was carried out with an ENVI system (Scintrex) equipped with a VLF sensor module. The VLF sensor consists of three orthogonal coils designed to make it an omni- directional system.

The acquiring system for the ERT-IP was a Terrameter LS resistivimeter (ABEM SE) with 12 channels and 250 W Tx ouput. The array was implemented by 4 multicore reels of 16 take-outs each, steel electrodes and connections, up to 64 electrode configuration system.

Details and Figures


IP&VLF surveys for gold in Central Yukon

Posted by on Tuesday, 24 September, 2013
BCGold Corp. announces that exploration work has commenced on its 100%-owned WS Property  in central Yukon. The Property is situated adjacent and along strike with Copper North Mining Corp.’s Carmacks Copper Project (the “Carmacks Project”), which has Proven and Probable Reserves of 11.5 million tonnes grading 0.98% total copper, 0.44 g/t gold and 4.3 g/t silver and is in the final stages of mine permitting.
The WS exploration program, partly funded by a $25,000 Yukon Mining Incentives Program (YMIP) grant, is designed to enhance current drill targets on the Property, which are interpreted to be the strike extents of Zones 12 and 14 of the Carmacks Project. Previous drill testing by BCGold intersected two near-surface copper sulphide horizons averaging 0.17% Cu over 63.1 metres (see January 13, 2009 news release). The 2013 exploration program will consist of the following:
  • detailed high-resolution IP geophysics near the claim boundary of the Carmacks Project and the Property;
  • a limited program of VLF geophysics and biogeochemical sampling, as alternative techniques to delineate further the strike extent of Zones 12, 14 and the ICE showing;
  • geological mapping and prospecting over a 2.5 km2 prospective area with IP and magnetic signatures and elevated copper-in-soil anomalies that are suggestive of near-surface, Minto-style mineralization.
BCGold’s 2013 exploration program will take approximately four weeks to complete. The IP geophysics program is being conducted by GroundTruth Exploration based in Dawson, Yukon. The concurrent VLF geophysics and biochemical sampling programs are being conducted by Dumas Consulting and Core Assets Consulting, both independent contractors to the Company. Biogeochemical samples will be submitted to Activation Laboratories Ltd. in Kamloops, British Columbia, an ISO 9001:2008 accredited laboratory.

The Targets

All of the Minto/Carmacks Copper-Gold properties were staked over areas with geological, geochemical and geophysical characteristics known to reflect near surface, high-grade, structurally controlled copper-gold mineralization in the region, such as the Minto and Carmacks copper-gold deposits.

BCGold Corp. is focused on the discovery of stand-alone and/or satellite copper-gold deposits, the latter of which could be used to supplement mill feed for the Minto and future Carmacks mining operations.

Nearby Deposits

Minto

Capstone Mining Corp.’s Minto Mine is a 3,600 tonne per day, conventional crush and flotation, open pit mining operation that produces copper concentrates with significant gold and silver credits. It is one of the highest grade open pit copper-gold mines in the world. Capstone continues to develop its resources and find significant new deposits in the area.

Carmacks

Copper North Mining Corp.’s Carmacks Copper Project has an NI 43-101 compliant Proven and Probable Reserve estimate of 10.6 million tonnes at 1.044% total copper, 0.484 g/t gold and 4.62 g/t silver. Copper North plans to construct an open pit mine with an acid heap leach and solvent extraction/electrowinning (SX/EW) process facility and is in the process of obtaining the final permitting requirement for mine operations, a Water Use License.


Magnetic survey in the Kivalliq and Baffin regions for kimberlites

Posted by on Tuesday, 3 September, 2013

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

photo courtesy of John Charlton

Airplanes and kimberlite trains

North Arrow looking for diamond indicators after acquiring new properties

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

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

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

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

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

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

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

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

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

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


Drilling in the Snow Lake greenstone belt

Posted by on Thursday, 2 May, 2013

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

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

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

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

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


Airborne Magnetic/VLF-EM Survey on the Big Easy Gold/Silver Property, Eastern NL

Posted by on Thursday, 3 January, 2013

Silver Spruce Resources Inc.

Highlights

  • Sinuous magnetic low, possibly tracing the alteration zone, joins the Big Easy and ET zones, 3.5 km apart

Silver Spruce Resources Inc. reports on the final results of the high resolution, magnetic / VLF-EM survey and check sample results for diamond drilling carried out on the road-accessible, Big Easy gold/silver prospect in eastern Newfoundland. The Big Easy (BE) prospect is an extensive, altered (silicified) system that covers an area of approximately 1.7 km by up to 300 m wide which was drilled in 2011 and 2012, giving significant gold (Au) and silver (Ag) values in several holes (news releases August 16, 2012 and June 7, 2011) defining a low sulphidation epithermal Au/Ag system. The less explored ET zone, 3.5 km to the south of BE, was discovered by prospecting in the south central part of the property in June 2011 and has recently been extended to a minimum 400 m strike length.

High Resolution Magnetic/VLF-EM Survey

The 349 line km survey covered the entire property at 70 m terrain clearance and nominal 300 m line spacing, with 200 m line spacing over the known mineralization at the BE and ET zones. The results show magnetic lows, most likely representing the alteration coincident with the mineralized zones at both the BE and ET zones. These two established zones are joined by a sinuous magnetic low, which may represent alteration/mineralization linking the two known zones. The overall sinuous nature of the magnetic low is believed to be related to crosscutting faults, which may offset the alteration system as shown by magnetic highs representing mafic dikes emplaced along ENE and NW trending structures. The VLF-EM survey shows the ENE and NW trends as conductive zones, most likely representing water filled shear systems. The airborne data will be incorporated in the database for the area to plan for further exploration in 2013.

“The significance of the probable continuation of the alteration/mineralization over the 5 km plus strike length from the Big Easy to the ET zone is that the trend is becoming more defined as we continue exploration along the strong, extensive, mineralized alteration zone – which has only been tested by 12 drill holes over 1.2 km at the Big Easy itself, in the northern part of the property,” says Peter Dimmell, President and CEO of Silver Spruce Resources. “The Big Easy-ET trend is intensely altered with strong silicification and the strength of the system, coupled with the results from the early stage drilling at Big Easy, indicates that we have the potential for a large deposit that could be of interest to a major gold/silver producer.”

Diamond Drill Hole Check Analyses

Results have been received for the area of questionable results in Au only, noted in the first check sample analyses received (news release October 18, 2012). This “gold anomalous” area had been flagged in the original results as an outlier, as it gave only low Ag values in comparison to most of the other significant Au/Ag zones which were duplicated, although with “nugget-type” effects in the check sampling. Two check samples from section 101 to 112.25 m in DDH BE-12-10 gave values of 28 and 64 ppb Au, in comparison to the two original samples which gave values >1 g/T and the overall section from 101 to 112.25 m (11.3 m), giving 0.8 g/T Au and 3.8 g/T Ag. Subsequently, the rest of the rejected samples from this section were re-analyzed as check samples at a second laboratory, with similar results as the first set of check samples. The pulps from these re-analyses were then re-assayed at the original laboratory, where they found similar results indicating only background Au values throughout the section in question. None of the high Au values were duplicated and assays generally gave near background values (<70 ppb Au), indicating a problem in the Au analysis at the original laboratory. Interestingly, the highest check sample Au value was 150 ppb Au in the sample from 111.5-112.25 m, which gave 2279 ppb in the original analyses. The Ag values were 7.4 and 8 ppm respectively in this sample interval, the highest Ag values in this section and generally reflective of Au/Ag association throughout the Big Easy core sampling. The originating laboratory is still trying to determine how the spurious results occurred; however, to date no explanation has been brought forward.


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..


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).


IP Survey Results over the Lucas Gold Target

Posted by on Sunday, 8 April, 2012
Noble Mineral Exploration Inc. announces the IP Survey Results and preliminary geological interpretation over part of the Lucas Gold Target, Project 81, Lucas Township, Timmins, Ontario, Canada.
Location: Northern Ontario, Smooth Rock Fall, Iroquois Falls & Timmins Area
Target Commodity: Nickel (Ni), Gold (Au), Chromium (Cr), Copper (Cu), Zinc (An), Silver (Ag)
Noble completed a 45km IP survey over a 1500m by 3000m grid at 100m line spacing using a pole –dipole array, at 25m electrode spacing with N=6 over the central part of the Lucas Gold Target. The Lucas Gold Target has an interpreted strike length of over 2500m, based on the historical drilling and preliminary airborne geophysical interpretation. Noble completed an Airborne Gradiometer Magnetic, VLF, Radiometric, and TEM surveys over the Lucas Gold Target in December 2011 and final results and interpretation are still pending. The Lucas Township Gold Target was the focus of earlier drilling dating back to 1960-1980’s by Canico, McIntyre Porcupine Mines Ltd, and Abitibi Price Resources – historical non 43-101 compliant results have been previously released by the company in earlier releases dated Dec., 01, 2011 and Dec., 05, 2011.
IP Interpretation:
The IP Survey outlined a number of high priority anomalies with Zone “A” and its closely related Zone “HD” in particular seems to partially explain the drill results of previous drilling campaigns in terms of holes that intersected Gold mineralization and those that did not intersect Gold mineralization.
Zone A represents the strongest horizon on the property and it relates to a good strong IP anomaly that strikes across the entire grid and continues off of the grid in both directions. It lies between 1100MN and 1050MN and it is a very conductive zone that lies along and within the strong magnetic high unit that also strikes across the grid. This zone appears to have been crosscut by a northeast-southwest striking fault that has offset the IP anomaly between lines 400MW and 300MW. This horizon corresponds to a series of northwest-southeast striking airborne targets.
Zone HD lies just to the northeast of Zone A and it either emanates from Zone A as it sits quite tight to Zone A on line 1400MW but appears to swing away to the northeast as it strikes to the southeast. The zone is well defined on line 1000MW at 1200MN. This zone lies along the southwest edge of the stronger portion of the magnetic high that is host to Zone A.
Zone B represents a good conductive horizon that parallels Zone A and it lies between 850MN and 800MN as it strikes across the grid area. The zone is associated with a narrow resistivity low situated between two highs. The zone also correlates to the southern flank of the magnetic high unit that is host to Zone A. This horizon may represent a sulphide rich contact zone lying at the southern edge of the magnetic high unit. This zone is also crosscut by a fault striking northeast to southwest.
Zone C represents a moderate to strong zone associated with a resistivity high. The northwest tip of this zone appears to correlate to the southeast edges of a magnetic high centered just to the northwest of line 1400MW. This horizon lies between 700MN and 600MN as it strikes across the grid area. The central and southeast section of the zone correlates to a modest magnetic low with the southeast tip lying along the southern flank of a modest magnetic high. This zone is cross cut by a fault structure striking northeast-southwest.
Zone D represents a moderate conductive horizon that lies between 500MN on 400MW and 300MN on 1400MW. This zone may emanate from the southeast portion of Zone C possibly due to the cross fault and it then strikes parallel to Zone C. This horizon appears to be deeper than the above mentioned zones and it is associated with a moderate and deep resistivity high. The southeast section of the zone correlates to a modest magnetic low unit.
Zone E represents a moderate to weak horizon that is associated with a modest resistivity low and it generally lies along the northeast flan of a broad magnetic high that covers the southwest section of the grid.

Complex airborne survey in Suriname

Posted by on Wednesday, 28 September, 2011

Hunter Bay Minerals plc  announces the completion of its airborne geophysical survey at its Sela Creek Project, Suriname. The 4,986 kilometre aeromagnetic, radiometric and XDS VLF-EM survey was conducted by Terraquest Ltd. and indicates that areas of known mineralization are coincident with magnetic and radiometric anomalism. Using this geophysical signature and first pass field work, Hunter Bay has identified three high priority targets for immediate follow up work: Central Ridge, Jons Pit-Texas trend and Eastern Anomaly.

Aeromagnetic data (Figure 1) indicates that the broad area containing the three high priority targets occurs within a regional scale, rhombic dilational structure approximately 20 kilometres long and up to 8 kilometres wide, bounded to the north and south by west-northwest trending shear zones. Preliminary interpretation, combined with field observations from limited outcrop, suggests that the mid-range subdued magnetic response within the rhombic structure is associated with deeply weathered metasedimentary rocks intruded by dioritic, granodioritic and tonalitic intrusions.

Many of the known saprolitic workings occur either at the inferred contacts between metasedimentary rocks and intrusive bodies or cluster along a 5 kilometre, northwest trending structure called the Jons Pit-Texas trend. These observations highlight the importance of intrusion-related targets at Sela Creek and the structural controls on mineralization. In detail mineralization is spatially related to localized magnetic lows and coincident high potassium radiometric anomalies, which are interpreted to represent areas of hydrothermal alteration (Figure 2).

Central Ridge is a 2 kilometre long, east-west trending magnetic low bounded by moderate intensity magnetic highs, located immediately northwest of the Jons Pit-Texas trend. This magnetic anomaly coincides with a 5 kilometre long, east-west trending ridge which forms the watershed between several prominent north and south draining creek systems. These creeks have been extensively mined for alluvial gold. Central Ridge represents a high priority target for follow-up soil sampling and mapping.

Eastern Anomaly is a new high priority target in the eastern part of the licence. Eastern Anomaly comprises a 2 kilometre long, northeast trending magnetic low and coincident potassium high, which is a similar geophysical signature to that observed at the Jons Pit-Texas trend.

In conjunction with the Terraquest airborne survey, Hunter Bay also conducted aerial reconnaissance using a Cessna light aircraft which has provided a better understanding of the spatial extent of mineralization defined by artisenal workings in saprolite. In particular, shear-hosted and structurally-controlled mineralization is more extensive than previously mapped and in some places artisenal workings define up to 3 sub-parallel mineralized zones with a combined surface expression of up to 100 metres wide and over 1 kilometre long (Figure 3). Collectively artisenal workings define a broadly northwest trending corridor approximately 5 kilometres long and 1.5 kilometres wide (Jons Pit-Texas trend). Small areas of artisenal working are also present in the north and west of the licence and represent new showings which had not been previously identified.

Hunter Bay is presently completing additional processing and more detailed interpretation of the geophysical data in order to further identify and prioritize geophysical targets. An extensive soil sampling and follow-up mapping program is to commence in July 2011. Data collected during this stage of the program will be used to plan a reconnaissance drilling program.

To view the three images associated with this release, please click the following link: http://media3.marketwire.com/docs/HBYmaps.pdf.


McFaulds Exploration Program with airborne surveys

Posted by on Monday, 14 March, 2011

UC Resources Ltd. reports results of the drill program from the McFaulds Lake project area of the James Bay Lowlands (JBL) in the “Ring of Fire” and about airborne surveys on the property.

The 950 km airborne survey has been partially completed as equipment breakdown prevented the full survey. So 430 km were completed using the SHA three-axis, helicopter towed, magnetic gradiometer and VLF-EM system at a flight path separation of 100 meters. This is a very low flying close gradient survey and is expected to provide vivid magnetic detail.

The second airborne survey, a Fugro Airborne Survey, conducted a high-sensitivity aeromagnetic and Falcon™ Airborne Gravity Gradiometer (AGG) survey over the East and West claims of UC Resources Ltd. The production flights took place during January 2011 with the first production flight taking place on January 3rd and the final flight taking place on January 6th. The survey completed 5 production flights for a combined total of 1810 line kilometres of data acquired. Final reports of the airborne surveys to the Company are still pending.

ZTEM survey was flown on May, 2009.


Mag, VLF, IP on Golden Porcupine gold property

Posted by on Saturday, 26 February, 2011

Mexivada Mining Corp. reports significant progress on its Golden Porcupine gold property, Deloro Township, in the main Timmins gold camp, Ontario, Canada.

Ground magnetic, VLF-EM, and induced polarization (“IP”) surveys recently were completed on the property and interpreted for Mexivada by Wright Geophysics. Enzyme leach geochemical samples also were taken on the property in 2010. Strong magnetic lows with zones of coincident IP chargeability and soil geochemical anomalies have been found, with ENE-, NW-, and N-S trends. A large footprint, northerly trending chargeability zone has been defined which is interpreted as a major, large-scale open pit disseminated, Pamour Mine style gold target. The chargeability anomaly here is believed to represent disseminated pyritic mineralization in late porphyritic intrusive rocks of the Pamour-Pearl Lake style that were discovered through historic assessment work within this main target area. Possible feeder zones to this chargeability anomaly are exposed at the surface, which carry 1 to 2 ounce per tonne gold mineralization. Banded iron formation targets also are present within the main open pit target area, in a large, 15 by 60 metre trench that was developed on a highly silicified, quartz-veined banded iron formation.

One magnetic-low anomaly area in the southern part of the Golden Porcupine property contains a large, 15 by 60 metre trench that was developed on a highly silicified, quartz-veined sequence interpreted to be banded iron formation. Two old trenches and a shaft are present in the southeastern portion of the Golden Porcupine property, and the trenches reportedly contained very high-grade silica-rich gold mineralization at the surface, with one trench assaying 2.2 ounces per tonne gold over 26 feet and the other trench assaying 1.1 ounces per tonne gold over 36 feet, in altered Keewatin basalts. Mexivada is starting a program of surface geologic mapping and sampling to evaluate these attractive targets. It appears that no drilling has been conducted previously on these two targets, nor in the areas with the intrusive rocks.


Mag and VLF-EM in BC for copper

Posted by on Saturday, 26 February, 2011

Logan Copper Inc.  has begun detailed field analysis of the mineralization potential of the Dansey, Midway and Bertha Molly Properties near Logan Lake, BC. Extensive ground geophysics followed by diamond drilling of specific anomalies has proven successful and will be continued in the 2011 exploration program.

The Logan Copper technical staff is continuing to conduct a detailed historical review of all previous exploration and production work on the whole Logan Lake property tenures owned by the Company and have now identified 4 key areas of increased potential for success. The geophysical crew is currently on the Bertha Molly prospect beginning the 2011 work program with 60 to 70 line kilometers of proton magnetometer, VLF-EM grids and trench sampling of new and existing showings. Diamond drilling of 8 new deeper holes to test deeper anomalies will commence in the spring, weather permitting.

Logan Copper found encouraging copper assays in the 2010 diamond drilling program. Drill targets were located by coincident MMI soil sampling and ground geophysics. Drill holes 10-LCD-19 and 10-LCD-20 from the 2010 exploration program will be logged and sampled for assay as soon as weather permits. The following drill core assay summaries highlight the copper results from the 2010 drilling that was analyzed.

The significant copper drill intersection appears in 10-LCD-16 which coincides with a ground magnetometer and VLF anomaly outlined by the 2010 geophysical program, which has also identified other anomalies that we intend to drill in 2011.


2011 Quebec North Shore exploration with Helimager+VLF

Posted by on Tuesday, 25 January, 2011

St-Georges Platinum and Base Metals Ltd. announces the start of its 2011 North Shore exploration campaign. The Company plans to conduct a significant amount of drilling in its 2011 Phases 1 and 2 campaigns on the Julie and Isukoustouc projects located, respectively, south of the Outarde IV hydroelectric reservoir and North East of the Manic III electric dam. The properties are approximately 70 miles north of the Quebec North Shore deep-seaport town of Baie-Comeau.

An extensive 6,075 kilometres of Airborne Geophysical survey has been commissioned with GPR Geophysics and is due to start in the next few days. 3,735 km will be conducted on the Julie block and 2,345 km on the Isoukustouc block . The survey will use the Helimager — which is a towed bird system configured as a horizontal magnetic gradiometer with two cesium vapour magnetometers installed at each end of the lateral arm, six meters apart, and a Totem-2A VLF receiver on the lower arm. The radar altimeter and a DGPS system are mounted on the central body of the Helimager system. The property will be surveyed with 100-metre line spacing and 1,000-metre tie-line spacing. Mr. Rejean Paul, Sr. Eng., P. Geo. will be the manager of the project, Mr. Marc Rousseau, Phys. will be the field manager and Mr. Olivier Letourneau, Phys. will be responsible for data processing.

Read more: http://www.digitaljournal.com/pr/206628#ixzz1C6uPcdRB


AIRBORNE GEOPHYSICAL SURVEY ON MOUCHALAGANE PROPERTY

Posted by on Tuesday, 25 January, 2011

Argex Mining Inc. has completed and received the final reports for a recently flown airborne geophysical survey completed on its 100% owned Mouchalagane property. Results from the survey demonstrate a magnetic anomaly of more than 40 km in length that corresponds with iron formations that have previously been mapped and from drilling on the property as well as two outlying magnetic anomalies that also correspond with previous work that demonstrated iron formations running 2 km long and 3 km long.

Argex continues to review the results of the recently completed airborne geophysical survey and will announce its future plans for the property shortly.

The survey was completed by Geophysics GPR International Inc. The survey reported magnetic and EM-VLF results. The survey consisted of one large block covering a minimum coverage of 2447 line kilometers. The survey used the Helimager™ which is a towed bird system configured as a horizontal magnetic gradiometer with two caesium vapour magnetometers installed at each end of the lateral arm, 6 metres apart, and a Totem-2A VLF receiver on the lower arm. The radar altimeter and a DGPS system were mounted on the central body of the HelimagerTM system. The property was survey with 100 metre line spacing and 1000 metre tie-line spacing.

The Mouchalagane property is 145 km North-Northwest of Manic Dam 5, just Northwest of Rene-Levasseur Island. The Mouchalagane property is also 185 km Southwest of Consolidated Thompson’s Bloom Lake property, and 275km north of the City of Baie-Comeau. A map showing the location of Mouchalagane is attached in this release as Figure 1 (also available on the companies website at www.argex.ca and www.sedar.com).

The Mouchalagane Property is located in the North Shore region of Quebec, part of the Grenville Geological Province. The Grenville extends from more than 2,000 kilometres in length and skirts the North Shore of the St-Lawrence River. Its width varies from 300 kilometres to 600 kilometres and forms the south east segment of the Canadian Shield. The Archean rocks of the Superior Province and the Proterozoic rocks of the Otish Basin are separated from the Grenville Province by the Grenville Front.

The Grenville consists of gneiss domes and basins with complex and irregular structural patterns, and intrusive rocks of variable composition, from gabbros to alkaline rocks. The circular shaped Manicouagan Structure is located in proximity to the Mouchalagane.

The first map of the region dates from 1955 which shows several iron formation occurrences (Mount South, Mount Barn, Parr North Lake, Crazy Lake and Everett Lake) These iron formations were discovered by the Oliver Iron Mining Company in 1954 following the publication of an aeromagnetic survey completed by Canadian Aero Service in 1952.

In 1957 Consolidated Morrison Exploration undertook geological and magnetic surveys on the Moore Claims. The then named Lake La Roque Property covered four separate zones of iron formation. The iron mineralization was described as being of two types: mineralized quartzite with hematite and magnetite; and iron formation containing magnetite and iron silicates. Gravity and magnetic surveys were performed in 1960 by Sulmac Exploration Services over the same area.

Geological mapping, a magnetic survey and 11 holes were drilled, as well as metallurgical tests were performed in 1957 and 1958 on the Moore Claims. Additional metallurgical tests were completed in 1960 on more than 12 sites in the same area.

The region was mapped by Berard of the MRNFQ in the early 1960′s. Berard describes all the geological units and the iron mineralization styles of the region.

Hanna Mining Co and Matonipi Mines were also very active on the Moore Claims in 1962 and 1963. They completed geological, magnetic and gravimetric surveys and metallurgical testing.

In 1975 Matonipi Mines completed additional metallurgical testing on six difference type samples: The Mount South quartzite-oxide, Mount South magnetite-silicates, Parr Lake quartzite-oxide, Parr Lake magnetite-silicates, Mount Barn magnetite-silicates and Crazu Lake magnetite-silicates.

The property was inactive until 2006 when Fancamp Exploration and Sheridan Platinum Group resumed mineral exploration in the region. A magnetic and radiometric survey were completed over part of the current Mouchalagane property.


Magnetic, VLF and radiometrics for REE

Posted by on Friday, 21 January, 2011

Silver Spruce Resources Inc. announces further results from ground geophysical surveys carried out on the 100% owned Pope’s Hill (PH) REE property located on the Trans Labrador Highway (TLH) in south central Labrador. The 73 line km geophysical survey of magnetics, VLF-EM and limited radiometrics was carried out in December under contract by Abitibi Geophysics of St Johns, Newfoundland. The surveys were focused on the original 62 claim block, which covers a 5 kilometer long trend of rare earth mineralization located in bedrock and angular boulders along and just to the north of the TLH. The surveys included GPS controlled magnetics, with readings taken every 2 seconds, VLF-EM with readings at 12.5 meter spacing and radiometrics, also at 12.5 meter spacing, over selected areas, covering some of the magnetic and electromagnetic anomalies located (see news release dated Dec. 30, 2010). The radiometric survey was limited in extent due to inclimate weather and was further hampered by snow cover which can affect the readings. The survey covered two small areas (4 lines) at 200 m intervals in the area of the bedrock pit and an area further to the east (2 lines) at 200 m intervals, which extended from the highway to the Pinus river to the north. The rare earth mineralization is variably non magnetic to magnetic and is associated with thorium/uranium making the samples radioactive and therefore responsive to radiometric surveys. The REE mineralization also appears to be shear hosted and the shear systems appear to respond to the VLF-EM survey.

The magnetics and VLF-EM show a number of linear magnetic anomalies, both positive and negative, crossing the property in an ENE direction. A number of the VLF-EM anomalies are coincident with, or marginal to, the magnetic highs with others in the magnetic low areas. A VLF-EM anomaly, between magnetic high zones, possibly indicating a shear system, occurs coincident with the anomalous REE samples in the bedrock aggregate pit on the side of the TLH and extends along strike to the east and west. The radiometric survey over this area shows a relatively strong, 1,000-1,500 total counts per minute (tcpm) and thorium anomaly coincident with the pit area and coincident VLF-EM anomaly which extends to the east and west along strike, over a 100 m plus strike length, and which is open to the west. Radiometric anomalies of 500 to > 1000 tcpm over background were also located in the central part of the grid, approximately 2 km to the east of the pit. No follow up has been carried out.

The geophysical and coincident prospecting targets will be tested by a diamond drill program planned for late January, 2011. The exploration application for the diamond drill program has been submitted to the Newfoundland government and a drill bid request has been sent to five Newfoundland based diamond drilling companies.

The original PH 62 claim property (1,550 ha) is located in the Pope’s Hill area, approximately 100 km from Goose Bay along the paved portion of the TLH. The claims were acquired to cover thorium and REE mineralization located in 2006 during uranium exploration when values of up to 7.9% total rare earth elements plus yttrium (TREE+Y) were located (see news release dated May 6, 2010). Thirty-one samples were taken in follow up exploration in October (see news release dated Oct. 28, 2010). All samples gave anomalous TREE+Y values with 16 > 5%, and 5 > 10% with a high value of 24% TREE+Y. TREE+Y values varied from a low of 0.07% to a high of 24.07% averaging 5.73% for the 31 samples, which included 7 “host rock” samples, with values < 0.2%. The anomalous trend has been traced over a 7 km strike length extending to the east, approximately 4 km, and to the west, approximately 3 km, from a bedrock aggregate pit on the TLH. The highest REE values are in a dark grey to black sub-metallic mineral in veins which are variably non magnetic to moderately magnetic. All of the REE bearing samples are weakly to moderately radioactive with significant thorium content and minor uranium values generally < 100 ppm.

Rock units on the claims are mapped as granitic to mafic gneisses of late Paleoproterozoic age, with some pegmatites. Linear monzonite bodies, possibly related to a major structure, lie just to the north and south, along strike, of the mineralized area. Syenites and/or granitic units of peralkaline affinity have been noted.

Maps showing the property location, a compilation map for the property, the geophysical results and a picture of the bedrock pit can be viewed below:

A total of 1,297 claims (324 km2), extending 40 km northeast and 40 km southwest of the original showings, were acquired by SSE in late October (news release Oct. 28, 2010) to protect the on-strike extensions of the mineralized zone and strongly anomalous lake sediment values in La and Ce with values up to 690 ppm against a background of 30 ppm. The 100% owned property, with the original 62 claim property included, now totals 1,359 claims (approx. 340 km2).

Analyses on the Pope’s Hill rock samples in 2006 were carried out at the ACME Laboratories facility in Vancouver, BC after sample preparation at Eastern Analytical in Springdale, NL. They were analyzed by a REE package (Group 4B REE), which consists of a 0.2 g sample treated by a LiBO2 fusion followed by an ICPMS finish. All 2010 rock analyses are done at the Activation Laboratories (Actlabs) facility in Ancaster, Ontario after sample preparation at their facility in Goose Bay. The analysis is by their Code 8 REE package which uses a lithium borate fusion and then analysis by either ICP or ICP-MS. Values were checked by Actlabs using internal standards.


MAG/VLF/IP on areas of Northern Ontario

Posted by on Monday, 20 December, 2010

Adroit Resources Inc. reports that a Second Grid Completed and MAG/VLF Survey, totaling 20 kilometers has been completed over Zones B, C and D on the Grassy Lake portion of the property. A MAG and VLF survey is currently being performed on this grid by Larder Geophysics of Larder Lake. The Red Vein 5,936 Ha property is located within the southern part of the Abitibi greenstone belt in the Shining Tree area of northern Ontario and is highly prospective for Copper, Zinc and Gold.

Gradient IP Survey. A gradient IP survey is scheduled to start on selected parts of the two geophysical grids on the Grassy Lake portion of the property on December 28, 2010, to be performed by Larder Geophysics.

The area has long been an area of intense interest, located in the heart of the exploration triangle of the three large Ontario mining camps of Timmins, (80 km due North), Sudbury, (150 km due South), and Kirkland Lake (75 km Northeast). There are 30 VMS deposits over 200,000 tonnes of massive sulphides within 200Km of the Red Vein property including Kidd Creek in Timmins of 147,880,000 tonnes grading at 2.31% copper, 6.18% zinc and 87 g/t silver and the Horne, H&G Orebodies in Noranda of 53,700,000 tonnes grading at 2.2% copper and 6.10 g/t gold. There are numerous historical copper showings on the property and gold showings abound in the surrounding area. The property is located approximately 10 km south-east of the former Tyranite Gold Mine and 8 km south of the Sothman nickel deposit (see News Release of October 6, 2008).