Posts Tagged VLF

The Magnetic/VLF survey in Newfoundland

Posted by on Thursday, 18 October, 2012
FacebookTwitterGoogle+Share
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).


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).


Mineral DIAGNOSe with CARDS

Posted by on Friday, 12 November, 2010
November 12th, 2010 – DIAGNOS inc.,  a leader in the use of artificial intelligence and advanced knowledge-extraction techniques, announced today it has signed a contract with Creso Exploration Inc. (“CRESO”) for the analysis of a large geophysical survey in the Shining Tree region based in Ontario. The Corporation will use its CARDS system (Computer Aided Resources Detection System) which is used to identify areas with high similarities to known mineral deposits, in order to identify lateral extensions of the Minto property as well as to define the signatures of other gold mineralization within the survey area. CRESO has 35 distinct gold occurrences, as reported by the Ministry of Northern Development, within its 280 square kilometers claim position and is using the Helicopter survey, the surface IP survey, the down-hole geophysical data, as well as the DIAGNOS CARDS system to prioritize prospective deep drill targets In a press release dated November 11, 2010, CRESO announced that it has received the final High Resolution Magnetic, Radiometric & XDS VLF-EM Helicopter Survey (the “Survey”) representing a total of 4,938 linekilometers. The Survey covers an area of 84 square kilometers surrounding the Minto property, 11.4 kilometers in a North-South direction and 7.4 kilometers in an East-West direction. The Survey was flown at 15 meter line spacing intervals.
In addition, the Survey covers an area of 11.65 square kilometers in Morel Township where two historical shafts are located 2 kilometers apart with historical values ranging up to 5.5 grams per tonne of gold, 14% Copper, 600 grams per tonne of Silver and 0.89% per tonne of Cobalt. As part of its mandate, DIAGNOS will help establish exploration priorities within the Morel property as well.

CARDS

CARDS is a vertical application developed by DIAGNOS to assist scientists and professionals of natural resources exploration companies in their search for profitable sites. CARDS uses MCubiX-KE’s, the latest artificial intelligence and pattern recognition algorithms to learn the “signatures” or “finger prints” of resources areas with a high economic potential and to automatically detect similar sites across unexploited regions. The result? A powerful tool that allows prospectors to spend more time exploring high potential areas.

CARDS’ use is simple. CARDS requires two types of data sets: a training set, used to discover the signature or fingerprints of highly profitable regions (compared to unprofitable ones), and one or many surveys describing the territory that is prospected. The final output is a map or layer that indicates the regions where economical resources are likely to be found.

CARDS can be applied to prospecting for diamonds, gold, copper, zinc, copper, oil and gas, etc. Each resource requires a special methodology supported by CARDS.


Mag, VLF and IP in Colombia

Posted by on Friday, 12 November, 2010

Mercer Gold Corporation announces that it has entered into an arrangement with KTTM Geophysics of Medellin, Colombia to perform 20 line kilometers of magnetometry and VLF-R surveys on Mercer’s Guayabales Gold Project in the Caldas Department of Colombia near Marmato. An additional quantity of IP- Resistivity studies are contemplated shortly thereafter.

The geophysics will investigate several target areas identified in earlier mapping and geochemical programs. The Guayabales Project exhibits several different target styles; some of which are deep seated. Ongoing drilling is expected to generate lithologic and structural information to aid in the interpretation of the geophysics data. The original 20 line kilometers are expected to take two weeks to complete with completion expected in December 2010. Subsequent IP- Resistivity studies should begin in late December.

Rahim Jivraj,

Mercer Gold’s CEO and President stated, “We’re committed to ongoing exploration at Guayabales and this type of work gives us more insight to further develop interpretations and targets for drill programs.”

In a district scale exploration context, the Guayabales Property is located immediately adjacent to, and on trend with, the mineralized structures of the Marmato mining complex. The Marmato complex contains three mining areas termed the Zona Alta, the Zona Baja, and Echandia.  In March of 2010, Medoro Resources Ltd. released a NI 43-101 compliant Marmato resource estimate reported at a 0.3 g/t gold cutoff of: a) 245 million tonnes of measured and indicated material averaging 0.95 g/t and yielding 7.490 million gold ounces, and b) 75.8 million tonnes of inferred material averaging 0.92 g/t and yielding 2.232 million gold ounces.  The resource also includes a significant silver credit. The mineralized trend hosting the Marmato resource projects directly northwest into the gold-silver mineralized zones hosted at Guayabales.


VLF-EM and magnetic anomalies under testing

Posted by on Monday, 8 November, 2010

Newmac Resources Inc. has received results from its trenching program and a second VLF-EM and magnetic survey recently completed on the Company’s Raft Property (previously referred to as the Ready Mix property) located approximately 35 km northeast of Clearwater, British Columbia.

Trench E has located the high grade bedrock source of gold on the Raft property for the first time in history. Representative grab samples of mineralization in two meter intervals from the central part of Trench E assayed 46.9 g/t Au, 59.9 g/t Ag and 1.56 g/t Au, 3.9 g/t Ag respectively. The actual total width of mineralization remains unknown as deeper than expected overburden only allowed for a portion of the VLF-EM target to be tested. Soil samples taken continuously beside the mineralized bedrock to the northeast of the high grade samples for 30 meters assayed between 3 and 50 ppb gold indicating that the zone could be wider than the 4 meters sampled. The mineralization is epithermal in character from an intrusive gold deposit as shown by the gold to silver ratio with associated base metals, arsenic, trace bismuth and antimony. The mineralized samples are on a 500 meter long VLF-EM conductor which has only been tested by Trench E. Numerous other VLF-EM conductors in a similar orientation remain untested on the property.

A total of 5 trenches (numbered A – E) were completed to test 5 different VLF-EM and magnetic structures located near anomalous gold soil samples. The first three trenches (A-C) did not locate mineralization. Trench D encountered anomalous levels of gold (165 ppb in one representative grab of soil). All 5 trenches were sampled by taking representative grab samples every 2 meters of either rock or soil. Grab samples are selective by nature and are unlikely to represent average grades on the property.

The Company has also completed a second VLF-EM and magnetic survey on an area not covered by the initial survey. A number of the new structures have been outlined in this survey, and the company plans to follow up on them in the future.

The Raft property has now been expanded to 13,881.21 hectares or 138.81 square kilometers.

David Schmidt, President and CFO of Newmac Resources Ltd. Stated “Making a brand new discovery in British Columbia is an exciting way to finish off our Phase One program at Raft. 2011 will be an exciting year as we will further test this VLF-EM structure and several other similar ones located on the property.”

The Company is currently planning a second phase program to follow up on this very successful first phase program.

Historically a stream sediment of 87 ppb gold was obtained from Martin Creek by the property vendor during his initial prospecting of the property. He also in 1999, uncovered a highly oxidized bolder of intrusive breccias which assayed 29.3 g/tonne gold and 202 g/tonne silver.

The Company views the Raft project as an excellent target for intrusion related gold mineralization because of several tungsten skarns in the area, anomalous gold, tungsten, molybdenum, arsenic in stream sediments, and Shuswap metamorphic terrain intruded by Cretaceous granites which have been recognized as causing the mineralization.

The Company has the right to earn a 100% interest in the Ready Mix claims (part of the Raft Property) by making an initial payment of $5,000 and issuing 150,000 common shares. Within two years the company will need to pay an additional $25,000 and issue 500,000 common shares, in two stages. The property will also be subject to a 2% Net Smelter royalty, where the full 2% may be purchased by the Company for $1 million at anytime.


HIGH GRADE INFILL DRILLING RESULTS AT EAGLE’S NEST

Posted by on Thursday, 14 October, 2010

Noront Resources Ltd. reports the remaining assay results from the infill drilling program at the Eagle’s Nest deposit at the Company’s McFaulds Lake Project in the James Bay lowlands, Ontario.

Noront’s President and CEO, Wes Hanson, states: “The Company is pleased with the results. Nickel, copper, platinum and palladium grades were higher than expected in the majority of the holes completed. Most of the holes targeted the inferred resource and the Company believes that a large percentage of the inferred resource has been upgraded as a result of this drilling.”

A little bit history about McFaulds Lake:

Airborne Geophysics:

EM+Mag:  2003 Fugro Airborne Survey -> 2007 Noront AeroTEM III Helicopter Survey -> 2008 VTEM Airborne Survey->2009 Z-Axis tipper Electromagnetic Geophysical Survey (ZTEM);

Gravity: 2009 Gravity Gradiometry Airborne Survey

Magnetic+VLF: 2009 High Resolution Aeromagnetic Gradient (HRAM) and VLF-EM Airborne Surveys

Ground Geophysics:

2004 Ground Magnetic and Horizontal Loop EM Survey -> 2006 Condor Diamond Corp In-fill Ground Magnetic Survey -> 2007 Magnetics, HLEM and Gravity Surveys over Eagle’s Nest Deposit -> 2007 Gravity Survey -> 2008-2009 Magnetic, VLF, HLEM, Gravity and Large Loop TDEM Surveys -> 2009 Gravimeter Survey on the Grid 2 Extension.


Worldwide VLF transmitters list

Posted by on Friday, 13 August, 2010

Several radio transmitters operate throughout the world in the VLF range, 15-30 kHz, and are used mainly for marine navigation, communication with submersed submarines, and other purposes.  The principle of VLF subsurface exploration is simple.  At large distances from the transmitter, the EM field is effectively planar and horizontal.  A conductor that strikes in the direction of the transmitter is cut by the magnetic vector, and these primary magnetic fields cause electric currents to flow in subsurface conductors.  In another, more recent, theory, the subsurface currents flow along interfaces between bodies of differing conductivity.

The Very Low Frequency (VLF) radio spectrum extends from 3 to 30 kHz. Standard communications receivers do not receive signals that low in frequency. Furthermore, most antennas used with standard communications receivers are optimized for higher frequencies and perform poorly in the VLF spectrum. Because of that, few Radio Amateurs or shortwave listeners have ever heard VLF signals and most know very little about the large number of stations in that part of the spectrum, what those stations are used for, or the nature of VLF radio signal propagation.

However, because VLF receivers and receiving antennas are easy to construct, the VLF spectrum attracts a small number of curious and sometimes very dedicated VLF listeners who want to learn more about this little-known and somewhat secretive part of the radio spectrum.

Signals from powerful VLF stations can be received worldwide. They penetrate deep into the earth and deep into the sea (especially in the lower portion of the VLF spectrum) and therefore can be received by submerged submarines. Though some VLF stations have other purposes, the primary function of most VLF stations is to communicate with submerged military submarines or help them navigate underwater.

http://www.smeter.net/stations/vlf-stations.php


Detail High Resolution Aero-magnetics, Horizontal Gradiometer, Radiometrics and XDS/VLF-EM for Creso

Posted by on Thursday, 1 July, 2010

Creso Exploration Inc. announces the award of a 5000 meter drilling program on the Shining Tree properties that will start this week including deepening by a further 300 m the Minto Hole #2 (18.2 g/t Au over 65.7 meters from 49.3 m to 115 m and 4.61 g/t Au over 79.6 meters from 132.4 m to 212 m – see) in order to do more down-hole geophysics and better delineate the gold bearing zone. Concurrently, Creso will initiate a detailed helicopter survey at 30m line spacing that will focus primarily on the Minto, Matona, Tyranite and Duggan Zones to outline known gold mineralization areas.

Creso has signed two airborne geophysical contracts with Terraquest Ltd both of which will start in July. The helicopter survey which will include Single Sensor High Resolution Aero-magnetics, Radiometrics and XDS/VLF-EM systems is based on 1779 line kilometers to be flown at low altitude with a 30m line spacing. The fix-wing aircraft will survey the entire eastern half of the Shining Tree properties covering large areas of the Tyrrell, Knight and Milner Townships survey and will include High Resolution Aero-magnetics, Horizontal Gradiometer, Radiometrics and XDS/VLF-EM systems over 5853 line kilometers at a 100m line spacing.

The combination of these two surveys is particularly well adapted to the Shining Tree Area where contrasts in hydrothermal alteration, mineralized volcanic and intrusive rocks, and complex structural features are common. Radiometric surveys will aid in delineating potassium enriched alteration zones commonly associated with gold mineralization in the area.


Cresco’s success on the Minto Project

Posted by on Tuesday, 29 June, 2010

Creso Exploration intersects 65.7 meters of 18.2 g/t g and 79.6 meters of 4.61 g/t Gold in Hole #2 on the Minto Project.

The MINTO Project is located half‐way between Timmins and Sudbury in Ontario and approximately 30 kilometers South‐West of NorthGate Minerals Corporation’s
Young‐Davidson gold deposit. The 2009 NQ diamond drilling two‐hole program best results are from Hole #2.

The Minto showing consists of a pod of carbonate sulphide breccias containing an estimated tonnage of 225,000 tons (204,000 t) grading 0.2 oz per t (6.8 g/t) Au to a vertical depth of 225m as determined and reported in 1984.  Gold is related to pyrite and quartz veining trending north south and northeast southwest.

From surface geology the upper zone presents a true width of 30 meters. The bottom zone is new and no true width has been determined yet. According to JVX Ltd, the down‐hole geophysical interpretation completed on the Minto property, indicates that the mineralized body extends in a north‐west/south‐east direction at a depth of 50 to 170 meters and is open at depth. The Corporation will drill a step‐out hole for the purpose of further defining the location of the body using more down‐hole geophysics.

In May 2010, Borehole Induced Polarization (BHIP) surveys were done on the Tyranite and Minto properties. Results from the Tyranite hole are not yet available. 3D conductivity and chargeability models from boreholes gradient IP data have been calculated for holes M‐0901 and M‐0902 on the Minto property.

The Corporation has completed down‐hole geophysical testing on the MacMurchy property and intersected 7.4% nickel and 2 g/t platinum and palladium over one meter in hole D6‐07 confirming the nickel potential of the area. The MacMurchy property is located in the southwest corner of the MacMurchy Township some 10 km SSW of the Minto property.

The Corporation is currently evaluating bids for an agreement for a 200‐kilometer low level airborne (Mag, VLFEM, and radiometric) geophysical survey to cover the Minto, Tyranite and Duggan zone on a 30‐metre spacing in order to define geological structures and mineralized zones. Upon completion of the geophysical survey, the Corporation will undertake a 5000‐meter drill program on the Minto, Tyranite and Duggan properties.

Conductivity Model

The 3D conductivity model represented by an iso-surface value of 0.005 S/m shows three conductive features. The first conductive feature is at shallow depth and is strong in the west direction as well as in the east direction. The second conductive feature is disseminated in the middle while the third conductive feature is at depth and to the southeast. 

Chargeability Model

The 3D chageability model shows three chargeable features. The third chargeable feature (northwest – southeast) at depth is strongest. The second and third inversion shells correlate with the gold mineralization.