Posts Tagged Fugro

Coincident Geochemical and Geophysical Data Pinpoints Drill Targets, Greyhound, Nunavut

Posted by on Saturday, 1 March, 2014
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Aura Silver Resources Inc. announces the results of a comprehensive report completed by L.E Reed Geophysical Consultant Inc. (“Reed”) which supports, from a geophysical standpoint, drill targets established geochemically by Activation Laboratories Ltd. (Actlabs) Spatiotemporal Geochemical Hydrocarbon (“SGH”) technology for the Aura Lake area as well as the Dingo prospect north-west of Aura Lake, both part of the Greyhound Project, NU.

As reported by Reed, “Correlations between the geochemistry and various geophysical data suggest support for the possible identification of gold and silver deposits at Aura Lake and a gold and copper deposit at Dingo”. This report may be accessed at the Company’s web-site (http://www.aurasilver.com/s/Home.asp) under the section Projects / Canada.

The potential sources of high-grade gold boulders (up to 28 g/t) and high-grade silver (up to 5,300 g/t) have been identified in close proximity to Aura Lake. The gold and copper targets at the Dingo prospect area north-west of Aura Lake are surface showings. New interpretation of geophysical data and SGH has refined the drill targets. This geophysical analysis has identified multiple structures/contacts with the use of three-dimensional inversion imagery of airborne VTEM EM and magnetic responses and ground Induced Polarization and Resistivity data. These structures/contacts at Aura Lake may have provided a pathway for fluids carrying mineralization and are interpreted to support the drill targets originally defined by geochemical analysis.

Robert Boaz CEO and President of Aura Silver states that, “The detailed geophysics analysis undertaken by Reed gives us further comfort that we are zeroing in on the source of high-grade surface gold, silver and copper mineralization. Despite the difficult market for all junior exploration companies we continue to enhance the value of our properties.”

During the fall of 2006, an airborne MEGATEM® geophysical survey was flown on the initial property by Fugro Airborne Surveys Corp. In 2007, further prospecting of MEGATEM anomalies took place. Samples collected in 2007 contained up to 2.4% zinc (Zn), 1.02% copper (Cu), 8.1% lead (Pb), 10g/t gold (Au) and 51 g/t silver (Ag) highlighting the potential for discovery of VMS (volcanogenic massive sulphide) ores.

During 2008, Fugro completed the flying of a GEOTEM® survey over the new Greyhound claim group. Results from this survey were utilized in an on-the-ground field program to complete geological mapping and sampling. Samples prospected during 2008 contained up to 4.1% Cu, 13.4% Zn, 8% Pb, 2,700 g/t Ag and 28g/t Au and to the northeast of Aura Lake a series of boulders contained up to 18.5% Zn and 9.2% Cu.

In late 2009, a high precision VTEM® helicopter borne electro-magnetic survey was completed.


The EM Test Range in Australia

Posted by on Friday, 12 October, 2012

Southern Geoscience Consultants have released the results of the BH, ground and Airborne EM over the two, discrete and varying bedrock conductors.

The Forrestania EM Test Range is situated approximately 85km by road/track east of Hyden and ~155km by road/track SSE of Southern Cross . The test range is well positioned and provides easy access if traveling from Perth or Kalgoorlie (~4-5hrs).

The Forrestania EM Test Range has been designed to allow testing/trialling of various electromagnetic methods (surface, airborne and downhole techniques) over two, discrete and varying bedrock conductors defined during previous geophysical exploration completed on behalf of Image Resources NL. The two bedrock conductors defined and drilled by Image Resources successfully tested these targets, intersecting barren, semi-massive to massive sulphides (po-rich).
The western conductor (IR2) is of limited areal size (<75x75m), shallow depth <100m, high conductance >7000S and dips northward ~30-40 degrees. This conductor is strongly defined by surface and downhole TEM and makes for an interesting airborne TEM target.

The eastern conductor (IR4) is extensive in strike/plunge extent (~500-600m+) and reasonably well constrained in depth extent (~100-150m). The conductive source is situated at considerable depth ~300-325m (western side) to ~400m+ (eastern side), is highly conductive ~5000-10000S and dips northward ~30-40 degrees. IR4 is a more challenging conductive target for surface TEM methods with smaller transmitter loops.

The local electrical environment is characterized by the presence of a conductive overburden (~10-20S), highly resistive bedrock units and lack of any other bedrock conductors in the immediate area other than the IR2 and IR4.

  • Work Completed at the EM Test Range
    • FLTEM dB/dt and B-Field HT-SQUID coverage over the IR4 bedrock conductor with large and small transmitter loops. FLTEM dB/dt coverage over the IR2 bedrock conductor with large and small transmitter loops. Figure 1 highlights some of these results. Completed as a standard survey by Outer Rim Exploration Services.
    • MLTEM dB/dt and B-Field fluxgate coverage over the IR4 bedrock conductor (200m transmitter loops, Figure 2). – Courtesy of GEM Geophysical Surveys.
    • DHTEM dB/dt – Crone PEM surveys, holes FRC1 and FRCD3 (Figure 3). Completed as a standard survey by Outer Rim Exploration Services.
    • Fixed Loop Total Field (SAMSON) surveying – Figure 4 – courtesy of Khumsup Ltd
    • Helicopter EM surveys – HELITEM (Fugro Airborne Surveys, 2011), VTEM-max (Geotech Airborne Ltd, 2011). An example of the HELITEM and VTEM-max is shown in Figures 56 respectively. Both datasets are available through the contractors only.
    • ZTEM survey by Geotech Airborne Ltd
    • 200m modern aeromagnetic/radiometric data coverage.
  • Proposed Work to be Completed at the EM Test Range
    • MLTEM using SQUID
    • DHTEM B-Field surveying of holes FRC1 and FRCD3 (FRCD3 is now blocked).
  • Download: Figure4_Forrestania-SAMSON.pdf (222.3kb)

    Geophysical Investigations on the Bathurst Mining Camp, New Brunswick

    Posted by on Wednesday, 25 April, 2012

    El Niño Ventures Inc. provides an update of the exploration work performed during the period July 1 to December 31, 2011 for its Bathurst Mining Camp (BMC) Base Metals Tri-Party agreement between El Nino, Votorantim Canada (VMC) and Xstrata Zinc Joint venture project in Bathurst, New Brunswick.

    VMC’s work on the Xstrata-El Nino-Votorantim lands during this period included diamond drilling and ground EM surveys. A Time Domain EM survey was completed by Eastern Geophysics Ltd. on two third party optioned properties; and a combined borehole and surface TDEM survey was performed southeast of the BM&S No.6. The following table summarizes the work completed during the period July 1 to December 31, 2011.

    Table-1 Exploration Activities Performed from July to December 31, 2011

    Diamond Drilling:

    As of December 31, 2011 a total of 16 holes, totaling 5,011 metres, have been completed on the Bathurst Mining Camp project (Figure 1). This Phase of exploration drilling campaign focused on geophysical and geochemical targets in the Brunswick Belt, two third party optioned properties in the Brunswick Belt and two optioned properties in the southwestern part of the BMC. The only hole drilled in the Camel Back project intersected widespread alteration with common traces of sphalerite.

    Ground Geophysics- Large Loop Pulse EM:

    A large grid was cut over the two third party optioned properties in Brunswick Belt and adjoining parts of Xstrata’s claims. Four loops were laid out and readings were measured in-loop and out-of-loop. Only a few weak areas of low resistivity were detected. Deep drilling, which subsequently tested the at depth extent of a narrow zone of subeconomic base metal mineralization, did not intersect any significant sulphide or base-metal mineralization.

    Borehole Geophysics:

    Borehole and surface Pulse EM surveys were performed southeast of Nepisiguit Dam in and around two drill holes completed in 2010 that intersected stockwork style copper-iron. Only a small off-hole response was found from the Pulse EM survey at Nepisiguit Dam and no further work is planned.

    Figure1 –Drill Holes Location Map


    Airborne Geophysics — Airborne Gravity Gradiometry (AGG):

    Fugro Airborne Surveys completed the Phase 1 AGG survey over two large areas in the Bathurst Mining Camp in May 2011. This was the first ever commercial survey using the ‘Falcon’ Gravity Gradiometer in a helicopter platform. Figure 2 shows the outlines of the surveyed areas. A decision to proceed with Phase 2 and 3 will be contingent upon results obtained in Phase 1. Final results have now been received and are being interpreted in conjunction with Votorantim’s HeliTEM magnetic and EM data and other historical data, with the objective of identifying targets for drill testing in 2012.

    Figure 2 –Airborne Gravity Gradiometry Survey


    2012-2013 Exploration Plans

    2012-Q1: Three drill holes were completed on third party options, in the Brunswick Belt, for a total of 1975 metres to test for base metal mineralization at depth. No significant mineralization was intersected. These three drill holes as well as three holes completed in Q4 2011 were tested by borehole pulse EM, however no anomalies were detected.

    2012-Q2 to Q4 and 2013 Q1: It is planned to drill-test airborne gravity gradiometer targets throughout the remainder of 2012. Ground geophysical surveys will be performed if necessary to refine some gravity targets.

    Figure 3 – Land tenure map showing the location of optioned properties in the Bathurst Mining Camp


    An unidentified flying object?

    Posted by on Tuesday, 27 March, 2012

    Helicopter surveying for company, but no one knows who

    Buchans (Newfoundland, Canada) residents have been witnessing strange flying objects over their town this past month.

    Last week, helicopters were seen hovering over the town, with objects suspended below – one horizontal in shape, the other a circle.

    One might think it had something to do with mineral exploration, and they would be right.

    But which company? Buchans Mayor Derm Corbett, who is regularly updated on mining activities in the region, said he had no idea who the mystery company or companies could be.

    “The only company that I know that was doing geophysics in the Buchans area is the Buchans Minerals Corporation,” he said. “That’s the only group I’m aware of.”

    But Paul Moore, the vice-president of exploration for Buchans Minerals, said it wasn’t his company, or SG Spirit Gold, the firm that it is engaging with.

    He said people with Buchans Minerals have seen a surveying helicopter, but he did not know what company it was.

    Another exploration firm, Messina Minerals, is active in the central region 48 kilometres southwest of Teck’s Duck Pond mine. Results the company announced on March 13, from its Main Zone project featured an estimate which includes indicated resources of 70 million pounds of zinc, 14 million pounds of lead, 8.7 million pounds of copper, 640,000 ounces silver and 7,500 ounces gold.

    “I don’t know who the company could be in Buchans,” said Messina President Peter Tallman. “Messina isn’t doing geophysics.”

    According to Merv Stacey, owner/operator of Red Ochre Inn in Buchans, two surveying companies are in town with the machines, including Geotech Ltd. of Aurora, Ontario, and Fugro Airborne Surveys.

    Anyone familiar with geophysical surveying would guess that the objects were used for collecting data, and they would be right. They are magnetic gradiometers for taking readings where the presence of specific elements can be identified.

    According to the website of Fugro Airborne Surveys, which carries out the process for a variety of mining and exploration companies, an element such as gold, which despite being highly conductive (in relation to electricity), vein type gold does not occur in sufficient concentration to be detected directly with airborne geophysics. However, the effects of the geological processes which result in gold deposition are often detectable.

    Geotech Ltd of Aurora, Ontario is currently carrying out a geophysical survey over the Buchans area, said Buchans correspondent for the Advertiser, Pauline Dean.

    “The magnetic gradiometer which hangs from the helicopter is approximately 1,000 lb and the largest part measures 26 metres in diameter and can take readings to a depth of 700 meters,” she said.

    However, the person she spoke to from Geotech would not identify their client. Stacey said that was the same thing with the Fugro employees, who would not say the name of the company that contracted them to conduct the survey in Buchans.

    Peter Tallman, the Messina president, speculated that a company may be interested in a property, but isn’t allowed to start work until the Exchange (whatever stock market they are listed on) regulation services grants regulatory approval.

    Published on March 26, 2012
    Sue Hickey & Terry Roberts

    Airborne Mag-EM results for BC Homestake Ridge Property

    Posted by on Wednesday, 22 February, 2012

    Bravo Gold Corp. has received final results from the 2011 airborne DIGHEM geophysical survey on its 596 square-kilometre Kinskuch project located adjacent to, and southeast of its own Homestake Ridge project in northwest British Columbia.

    The survey, which used Fugro’s DighemV-DSP electromagnetic system, totaled 3,821 line-kilometres flown at a nominal 100 metre spacing, which included 364 line-kilometres of tie lines at 1,000 metre spacing, and was completed from August 1st to September 14th, 2011.

    The survey coverd about 60 percent of the total project area, was completed from the company’s base of operations at Alice Arm at the southern margin of the survey block.

    The goals of the survey were met, the company said, with the data allowing for the mapping and delineation of controlling gold structures, as well as the identification of areas with anomalous conductivity, which suggest the presence of sulphide mineralization.

    Bravo said several zones of anomalous conductivity have been identified within key target areas throughout the project.

    The Illiance River trend, which was a target of the company’s 2011 exploration efforts, showed up in the survey as both a broad magnetic low and an electro-magnetic high (conductive zone suggesting the presence of sulphides) extending over a five kilometre strike length of strongly altered volcanic stratigraphy – an important host at the nearby Homestake Ridge project.

    The target in this area is high-grade silver-enriched polymetallic mineralization within a series of sub-vertical structures occurring along the altered trend. Only a 2.5 kilometre strike length of this geophysical trend was mapped and sampled by Bravo during 2011, it said.

    Bravo also completed four drill holes within the Illiance River trend in 2011, three of which returned what it called “encouraging” assay results including a 2.8 metre interval averaging 318 grams per tonne (g/t) silver, 0.4g/t gold, 2.2% lead and 6.5% zinc from drill hole KN11-02; and a 3.9 metre interval averaging 268 g/t silver, 0.2g/t gold, 3.4% lead and 6.5% zinc from drill hole KN11-03.

    The holes were drilled from two set-ups, 500 metres apart. Mineralization remains open at depth and to the north and south, Bravo added.

    The company also said that a program of geological prospecting, sampling and ground geophysics is being recommended to further delineate the conductive zones and to identify disseminated sulphides, which could indicate anomalous silver and gold mineralization.

    Follow-up exploration will be carried out within an expanded 2012 exploration program on the project, which is planned to include an “aggressive surface exploration program” and up to 10,000 metres of diamond drilling on the Illiance River trend, as well as other targets throughout the property.


    Butler Project – Exploration Overview with Geophysics

    Posted by on Tuesday, 14 February, 2012

    MacDonald Mines Exploration Ltd. provides an exploration update in the mineral-rich Ring of Fire region of the James Bay Lowlands.

    MacDonald began exploring in the Ring of Fire starting in 2003, shortly after the first volcanogenic massive sulphide (VMS) discovery at McFaulds Lake by Spider Resources and KWG Resources. The McFaulds VMS discovery is characterized by very high-grade intersections of VMS mineralization (McF-04-57 intersected 18.8 meters of 8.02% Copper (Cu), Mc-03-18 averaged 4.83% Zinc (Zn) over 25.75 meters) and at 250 meter-plus depths.

    Exploration in the James Bay Lowlands is challenging due to the area being almost entirely a wetland. As a result, there is minimal outcrop, helicopter support is required and exploration time lines are longer. Over $18 million dollars has been spent to date on the Butler property and we have discovered six zones of multi-element mineralization with copper-zinc VMS systems, vandiferous titano-magnetite and magmatic nickel sulphide. This was accomplished through comprehensive exploration programs including geophysics, diamond drill holes and geochemistry.

    Magnetic map (TF) of the Butler Property showing the location of identified multi-element, mineralized zones.

    The lack of outcrop requires that a significant amount of attention and detail has to be paid to the geophysical techniques used in the area. Historically the programs focused on shallow targets; however down-hole surveys, ground magnetic and gravity surveys have indicated that the potential deposit(s) of interest lies deeper in the structural sequence.

    A comprehensive suite of geophysical tools has applied at Butler:

    Airborne EM, Magnetics & Gravity

    • 2004 VTEM – 2138.9 line kilometers of data were collected
    • 2008 VTEM – 1325.6 line kilometers of data were collected
    • 2010 AeroTEM IV – 261 line kilometers of data were collected
    • 2011 HeliGeoTEM – 261 line kilometers of data were collected
    • OGS/GSC Airborne Gravity Gradiometer

    Surface EM

    • Butler 1 – 13 line kilometers of data were collected
    • Butler 3 – 39.3 line kilometers of data were collected
    • Butler 5 – 12.5 line kilometers of data were collected
    • Butler 3, 5, 6, and 7 – 30.17 line kilometers of data were collected

    Surface Magnetics

    • 7 Ground Magnetic surveys completed in 2011 covering 81.1 line kilometers

    Down hole EM

    • 64 diamond drill holes probed and modeled

    The Company is currently enhancing the geophysical model to include the geochemistry data results. Collectively, all of the above geophysical results have consistently shown that an electrically conductive unit with magnetic properties and high density lies below those prospective zones.  These are the characteristics expected from a sulphide rich zone.

    Magnetic map (TF) of the Butler 3 area showing the location of the EM target and magnetic susceptibility anomaly

    MacDonald’s upcoming drill program will focus on the Butler property: Prior to drilling, the targets will first be refined using a deep penetrating geophysical method, similar to that used to detect the HudBay – Lalor deposit at Snow Lake, Manitoba.


    Exploration at Limão Gold Project in Brazil

    Posted by on Tuesday, 17 January, 2012
    Amerix Precious Metals Corporation reports that incoming results from its 2011 exploration program have outlined anomalous gold targets defined from geochemical surveys  that have been conducted across several grids established on the Company’s 10,000 hectare Limão Gold Property, located in the Tapajós District, Pará State, Brazil.
    Amerix contracted Fugro Aviation of Brazil for an airborne magnetic and radiometric survey over its property as reported in News Release NR 2011 – 09. TerraNotes Ltd Geophysics of Toronto provided additional interpretive consultation of the airborne data.  New grids, existing grid extensions and infill lines have been completed as a continuation of Amerix’s 2009 and 2010 geochemical surveys, as well as over new, prospective areas identified from the airborne geophysical data. The geochemical grids cover an area of approximately 7.7 square kilometres of the approximate 100 square kilometre Limão property.  Grids were primarily sampled using a manual auger to take 1 metre deep samples at 20 metre spacing along the grid lines. Secondary, closer spaced grid lines and sampling was done over areas with anomalous geochemical results. Each grid line was mapped and every sample was geologically logged and then prepared for shipping and analysis. All samples were prepared at Acme Labs preparation facility in Itaituba, Brazil and samples were shipped to Acme’s Santiago, Chile Laboratory for fire assay gold analysis. The Company utilizes a QA/QC chain of custody program overseen by its geologists concerning its samples. Over 3,700 samples were taken during the 2011 program covering 4 principal grid areas and the geochemical results are presently being received by the Company in batches.
    Complete results have been received for the South Grid geochemical survey and these are presented in the accompanying Figure 2. The South Grid covers 0.6 square kilometres and was established primarily to cover an area of past, small scale, informal mining. Importantly, the 2011 geochemical survey identified a significant soil anomaly at the South Grid. The anomaly is defined by greater than 20 ppb gold traceable for 350 metres along a 290 degree trend that is coincident with the old workings.
    Company geologists have identified quartz veining occurring along easterly to westerly oriented, sheared contacts within predominantly granitic host rocks as exposed in a shaft and a cut face at the – 2 - workings. Rock sampling and geologic mapping in the immediate vicinity of these workings and along the coincident gold geochemical anomaly will continue in the early 2012 exploration program. Amerix anticipates that this target will be developed for drill testing in the upcoming 2012 drill campaign. A second gold in soil anomaly occurs in the east section of this grid area. This anomaly extends for approximately 250 metres in an easterly to westerly direction and is open to the east. Additional geochemical and rock sampling will be undertaken to define the extensions of this target. Several other minor anomalies also occur on the South Grid and may be the subject of further detailed survey work.
    Complete results from geochemical analyses for the  other three grids are expected later in the first quarter. The Company will provide these results as it prepares for drilling that is anticipated to begin after the rainy season and later in the spring. Amerix is well funded to complete its first drill campaign at the Limão project, located in the historically gold rich Tapajós district of Brazil.

    Priority Targets in Blackwater Gold Area, BC

    Posted by on Wednesday, 9 November, 2011

    Greencastle Resources Ltd. provides an update on progress at its Nechako property located in the Blackwater gold camp approximately 100 kilometres southwest of Vanderhoof, central BC. Greencastle has an option agreement to acquire a 100% interest in the property, covering approximately 13,000 ha (28 claims), on the Nechako Plateau.

    The property is located in the same general Blackwater area where, in 2010, Richfield Ventures Corp. discovered a significant bulk tonnage gold deposit. In June 2011, Richfield was acquired by New Gold Inc. (“New Gold”) for approximately $550 million. In a release dated September 16, 2011, New Gold estimated that, from drilling results to date, the discovery contained resources of some 6.6 million ounces of gold. On October 17, 2011, New Gold announced the acquisition of Silver Quest Resources Ltd. and Geo Minerals Ltd., further consolidating its position at Blackwater to the west and northwest. Greencastle’s Nechako property is geologically on trend to the north of New Gold’s Blackwater property.

    A detailed heli-borne magnetic and EM geophysical survey has been completed by Fugro Airborne Surveys Corp. ) to define targets for follow-up exploration on the Company’s property. The airborne survey covered 1,487 line-kilometres, including tie lines. Flight lines were flown east-west with a line separation of 100 metres. The initial Fugro report has identified some 73 ‘high-priority’ AEM anomalies based on favourable structure, magnetic association, conductance, length, width, or depth extent, as well as several more extensive conductive zones. Although some of these could reflect sulphide-type targets, most are considered to be of lesser priority, given the non-conductive nature of the expected auriferous target mineralization at Blackwater.

    Due to the complexity of interpreting this style of gold mineralization from geophysical data, Greencastle engaged the services of Intrepid Geophysics Ltd. (“Intrepid”) of North Vancouver, BC, to undertake a more detailed analysis of data collected by Fugro. This interpretation was based on an integrated analysis using a combination of GEOSOFT‘s integrated editors (spreadsheet and flight path), advanced Fourier filtering and multi-scale edge detection, ER MAPPER’s image enhancements and MAPINFO’s GIS capability. The Intrepid interpretation attempted to further discriminate these targets into a smaller grouping.


    New geophysical data release for the Iditarod survey area

    Posted by on Wednesday, 2 November, 2011

    The Division of Geological & Geophysical Surveys (DGGS) on Nov. 3 will release airborne geophysical survey data and maps for about 850 square miles of the Innoko and Iditarod mining districts (Alaska) to help geoscientists decipher the complex geology of this highly prospective area. The Iditarod survey area is about 22 miles west of McGrath and 200 miles northwest of Anchorage, Alaska. DGGS believes the data will be useful for resource exploration, planning, and land-use management.

    The Iditarod–Innoko mining districts have produced more than 2.3 million ounces of gold, with only 3,000 ounces of this production from lode sources. The headwaters of most placer-producing creeks in the area are in igneous rocks. The discovery of over 30 million ounces of gold associated with a Late Cretaceous dike swarm at the Donlin Creek deposit has helped keep mining activity high in the region. A minor part of the survey along the southeastern edge lies in the McGrath mining district.

    The Iditarod survey ranges from the Ganes Creek area in the north, southwestward through Beaver Mountains to Camelback Mountain and then westward to just north of Flat. The region has been relatively underexplored. Airborne geophysics is a valuable tool for characterizing bedrock types, projecting geology between sparse outcrops, and identifying anomalous geologic signatures covered by vegetation that might be associated with lode mineralization. Funding for the Iditarod Survey was provided by the Alaska Legislature as part of the division’s Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. Data for the survey were collected and processed in 2010 and 2011 by Fugro Airborne Surveys.

    The electromagnetic and total-field aeromagnetic survey data will be released at 9 a.m. on Thursday, November 3, at the DGGS office in Fairbanks, and they are available in both digital form and as printed map sheets. Data will be downloadable from the division’s website http://www.dggs.alaska.gov at no charge. Electromagnetic-anomaly maps and an interpretive project report will be available at a later date.

    DVDs and the individual map sheets are available for the cost of reproduction. They can be inspected and purchased at the division’s office at 3354 College Road, Fairbanks, Alaska 99709-3707. Call 907-451-5020 to place phone orders. Mail orders should be sent to the Fairbanks DGGS office at the above address or via fax (907-451-5050) or e-mail dggspubs@alaska.gov. The order form, with location map, will be available November 3 on the division’s website at www.dggs.alaska.gov/pubs/project-orderform/750. The digital data and map sheets will be downloadable at no charge through links on the order form beginning at 9:00 a.m. on Thursday, November 3.


    Airborne Magnetic Survey in NWT for iron

    Posted by on Saturday, 1 October, 2011

    Coltstar Ventures Inc. provides an update on its Mackenzie Mountains exploration program. To date, the Company has completed an airborne magnetic survey and a field program over the entire property. Collectively, these exploration activities delineated numerous magnetic anomalies and identified iron formation at the northwestern and southeastern extremities of the property.

    The Mackenzie Mountains Project

    The Mackenzie Mountains Project is contiguous and adjacent to the Snake River (Crest) iron deposit, the 2nd largest undeveloped iron deposit in the world. The Crest iron deposit has been reported to host a historical resource estimate of 5.6 billion tonnes at 47.2% Fe and a reported “regional resource estimate” of 18.6 billion tonnes (Yukon MIN FILE # 106F 008). Coltstar notes that a qualified person has not done sufficient work to classify Chevron’s historical estimate at Crest as current mineral resources or mineral reserves and Coltstar is not treating this historical estimate as current mineral resources or mineral reserves.

    The property covers a 170-kilometre belt underlain by both the Rapitan and Coates Lake Groups.

    Airborne Magnetic Survey

    During the month of July, Fugro Airborne Surveys flew a helicopter-borne magnetic survey over the Mackenzie Mountains property. The Fugro survey coverage consisted of approximately 4400 line kilometres, at 300-metre line spacing. The purpose of the survey was to detect zones of mineralization and acquire information that could be used to map the geology and structure of the survey area.

    The aeromagnetic survey was a complete success. Numerous long magnetic anomalies were delineated. Importantly, the survey outlined two 10 kilometre-long anomalies, extending from drilled iron formation on Chevron’s Snake River (Crest) iron ore deposit immediately onto Coltstar’s ground to the south. From here, an almost continuous magnetic anomaly was delineated over the remaining length of the Mackenzie Mountains property.

    Paterson, Grant and Watson (PGW), a firm of consulting geophysicists out of Toronto, conducted a structural and lithological interpretation of the airborne geophysical data acquired by Fugro. Preliminary analysis of the geophysical data led PGW to identify a number of anomalous areas for follow-up or more detailed exploration. These areas were defined on the basis of their higher magnetization relative to the very low background levels of non-magnetic sedimentary units.

    These areas were divided into three categories, based on their relative magnetic signatures:

    1. 114.6 km2 of iron-rich Rapitan formation, exposed or very close to the surface;

    2. 416.9 km2 of iron-rich Rapitan formation, covered by sedimentary rock; and

    3. 302.7 km2 of deeply buried iron-rich rocks.

    Field Program – Mackenzie Mountains Iron Project

    Aurora Geosciences Ltd. conducted a ground exploration program over the Mackenzie Mountains property consisting of geological mapping, ground magnetic and susceptibility measurements and the collection of chip and rock samples.

    The goal of the field program, which focused primarily on claims in the immediate vicinity of Chevron’s Crest iron deposit, was to investigate the magnetic anomalies detected by the airborne geophysical survey and to confirm the presence of iron formation in areas mapped as Rapitan Group on Coltstar’s claims.

    During the ground exploration program, iron formation was observed in a number of locations on Coltstar’s Mackenzie Mountains property. The field crew observed iron formation outcrops on Coltstar’s property south of Chevron’s Crest property (Zone A). This iron formation unit continues, at a shallow angle, on Coltstar’s property, until it is terminated by a thrust fault several kilometres away. The area of potential iron formation between the outcrop location and the contact with the fault is approximately 9 km2. A Chevron drill hole, located 375 metres north of the iron outcropping on these Coltstar claims, intersected 27.4 metres grading 43.1% soluble iron.

    West of Zone A, iron formation exposed in a riverbed on Chevron’s property, is likely to extend, at a shallow angle, onto several of Coltstar’s claims (Zone B). Zones A and B, each 10 kilometres long, are spatially related to the magnetic anomalies delineated by the aeromagnetic survey. For a map, showing the locations of Zones A and B, please see www.coltstarventures.com .

    Confirmation of Copper Prospectivity

    On the last day of the field program, the geological crew found malachite-stained boulders in a talus field. This observation of malachite, a common oxidation product of copper mineralization, confirms the property’s copper prospectivity. It was not possible to access the likely outcrop source due to the steep terrain. The area where the malachite was observed is coincident with thickening of the Coates Lake Group on the Mackenzie Mountains property. This discovery warrants follow-up given its occurrence in a geological setting, which is similar to that which hosts the Nite, Keele and Coates Lake deposits further to the south.

    Next Steps

    A ground magnetic survey and measurements of magnetic susceptibility were made during the field program in order to characterize the magnetic signature of various rock units. The results of this work will assist in the modeling of the aeromagnetic results. The primary goal of the modeling is to outline the distribution of the iron formation throughout the property.


    Airborne geophysics over the Symphony Property

    Posted by on Thursday, 22 September, 2011

    BonTerra Resources Inc. Fugro Airborne Surveys has commenced an aeroelectromagnetic survey over the entire Symphony Property (the “Property”). The Property is situated in the Omineca mining division approximately 29 kilometres southwest of Houston, British Columbia.  BonTerra recently staked additional claims to consolidate its land position situated in between the Silver Queen Mine to the south and the Silver Streak property to the north.

    Directly bordering the Property to the south is the past producing Silver Queen Mine. Historical ore grades are 8.72 opt (299 grams / tonne) silver, 0.18 opt (6.17 g/t) gold, 6.73% zinc, 1.16% lead, and 0.47% copper.

    The Silver Queen property is currently being advanced by New Nadina Explorations. New Nadina has intersected silver, gold and base metal mineralization on the property. They have completed an aeromagnetic and ZTEM survey, a titan geophysical survey and diamond drilling. Drilling revealed grades of up to 493.5 g/t silver, 5.06 g/t gold, 13.5% zinc, 6% lead and 2.88% copper. The mineralized trend has a general southeast to northwest trend, the direction towards which the Property is situated.

    General Location Map:

    http://www.bonterraresources.com/i/pdf/SymphLocationMap.pdf

    The Silver Streak property is situated to the north of the Property. Trenching on the Silver Streak identified significant mineralization which included 1.99% Cu and 338 g/t Ag over 33 meters. An inclined diamond drill hole was drilled underneath this trench in 1991. A zone grading 8.8 meters of 0.49% copper and 258 g/t silver, within 21.1 meters averaging 0.27% copper and 127 g/t silver was discovered. Another trench excavated in 2002 graded 0.26% copper and 1.91 g/t Ag over 16.7 meters. The mineralized zone is believed to have a NW-SE strike, the general direction of the Property.

    This DIGHEM Electromagnetic survey with optional Radiometrics will total 308 line kilometres of readings. DIGHEM records electromagnetic data which can be interpreted to show changes in bedrock geology to great depth. The system uses multiple frequency electromagnetic fields to measure and map electrical conductivity in three dimensions. The DIGHEM EM system provides the interpretation benefits that can only be realized by a system employing both horizontal coplanar and vertical coaxial transmitter-receiver coil-pairs. BonTerra has selected Fugro’s optional Radiometrics application for an effective geological mapping solution as part of this mineral exploration program. The Company plans on using this survey to identify additional targets of interest on the property in its evaluation for silver and base metal mineralization potential on the Property.


    2D Survey in Northeast Greenland

    Posted by on Tuesday, 6 September, 2011

    TGS has commenced a new 1,000 km multi-client 2D survey in Northeast Greenland in partnership with Fugro.

    This survey will enable customers to prepare for the announced Greenland Licensing Round in 2012/2013 and will significantly add to a data set that TGS has been growing since 2008 in this promising region. After this year’s data acquisition, TGS will be able to offer approximately 4,500 km of new multi-client 2D data, a large volume of reprocessed multi-client 2D data and full coverage of aeromagnetic/gravity data over the basins that are to be included in the planned licensing round.

    The new seismic data is being acquired by the M/V Akademik Shatskiy supported by the ice breaker M/V Fennicia and is scheduled to complete during Q4 2011. Data processing will be performed by TGS and data will be available to clients during Q1 2012.


    Geophysical prospecting in Southwest Greenland

    Posted by on Tuesday, 30 August, 2011

    North American Nickel Inc. (“NAN”) announces that it has commenced a field campaign to evaluate prospective areas within its 4,841 km2 exclusive mineral exploration licence. Electromagnetic anomalies, identified from a recent re-interpretation of a 1995 GeoTEM fixed wing survey, along with other areas of interest derived from compilation of previous work and satellite imagery will be ground checked in order to prioritize areas for helicopter borne time domain electromagnetic (TEM) surveying planned for September and October.

    NAN plans to integrate the results from the field program with its existing database of historical work to optimize the upcoming helicopter borne TEM survey. The helicopter TEM system has much higher signal to noise ratios than the 1995 fixed wing survey and the helicopter can better maintain the required altitude above the ground to maximize the detection of geophysical signals from nickel-copper sulphide mineralization.

    North American Nickel also controls a 4,841 square km Mineral Exploration Licence in southwest Greenland with exclusive mineral exploration rights. The principal target is high-grade nickel-copper occurrences associated with norite and other mafic and ultramafic intrusions.


    Yukon: the successful PGM project

    Posted by on Friday, 15 July, 2011

    Yukon Wellgreen project promises to be one of the largest Platinum Group Metals projects in Canada.

    Geotech Helicopter-borne Versatile Time Domain Electromagnetic (VTEM) and magnetic survey flown in 2007  provided a window to bedrock geology through overburden covered areas of the property while outlining several new areas of exploration interest. A Fugro helicopter-borne Mag and EM survey conducted in 2008 demonstrated that the magnetic signature of the peridotite extends approximately 6 km on Prophecy Platinum’s ground.

    Prophecy Platinum Corp.  announces the receipt of an independent National Instrument (NI) 43-101 compliant report and mineral resource estimate for its Wellgreen PGE-Ni-Cu property located in the Yukon Territory, Canada.  The independent study incorporated drill data from 701 diamond drill holes (182 surface and 519 underground) totalling over 53,222 metres. Using a 0.4% NiEq (nickel equivalent) cut-off grade, the Wellgreen deposit now contains a total inferred resource of 289.2 million tonnes at an average grade of 0.53 g/t platinum, 0.42 g/t palladium, 0.23 g/t gold (1.18g/t PGM+Gold), 0.38% nickel, and 0.35% copper. Separately, the deposit also contains an indicated resource of 14.3 million tonnes at an average grade of 0.99 g/t platinum, 0.74 g/t palladium, 0.52 g/t gold (2.25 g/t PGM+Gold), 0.69% nickel, and 0.69% copper. The resource includes both the East Zone and the West Zone of the Wellgreen project.

    Widespread nickel-copper-PGE mineralization on the property is related to a swarm of Triassic aged mafic-ultramafic sills that extend over a lateral distance of 4.5 km and a stratigraphic interval of at least 1.5 km. The sills are preferentially emplaced along the contact between Pennsylvanian to Permian Station Creek Formation volcanic rocks and Early Permian Hasen Creek Formation sedimentary rocks. The sills are thickest along a northerly trending ridge that bisects the central part of the property and this area may be near the intrusive centre.

    Best grades of mineralization occur in the west part of the property where relatively thin but laterally extensive sills that are elsewhere dominated by peridotite give way to a greater proportion of gabbro. Mineralization consists of disseminated sulphides in gabbro, which to date have received little attention, and banded to massive sulphide mineralization along the sheared contact between gabbro and country rock. The banded to massive sulphides are enriched in the rare PGEs rhodium, osmium, iridium and ruthenium.


    Airborne electromagnetic data and inversion models for two regions in Australia

    Posted by on Sunday, 3 July, 2011

    New airborne electromagnetic (AEM) data and inversion products have been released for the Frome Embayment area in South Australia. The data were acquired using the TEMPESTTM AEM system during 2010 and cover 95 450 square kilometres in 32 317 line kilometres. The survey primarily targeted potential uranium-bearing mineral systems in the Callabonna Sub-basin of the Frome Embayment and the Lake Eyre Basin on the flanks of the northern Flinders Ranges, continuing to Marree and Cameron Corner and included portions of the Curnamona Province and the northwest Murray Basin.

    This data release includes new inversions using the Geoscience Australia layered earth inversion (GA-LEI) algorithm and data products, including point-located ASCII data and geo-located grids, sections and images.

    The Phase 2 Frome Embayment TEMPESTTM AEM survey final inversion data and conductivity models will be available from 7 July 2011 as a free download.

    New airborne electromagnetic (AEM) inversion products have been released for the Kombolgie VTEMTM AEM survey area in the Northern Territory. Data have been inverted using the layered Earth inversion algorithm software developed at Geoscience Australia.

    The Pine Creek AEM Kombolgie survey covered a total of 8800 line kilometres over an area of 32 000 square kilometres and included mapping of subsurface geological features associated with unconformity-related, sandstone-hosted Westmoreland-type and Vein-type uranium mineralisation. The data are capable also of interpretation for other commodities including metals and potable water as well as for landscape evolution studies. The improved understanding of the regional geology to a depth of greater than 1500 metres resulting from the inversion results will be of considerable benefit to mining and mineral exploration companies.

    The Phase 2 Kombolgie VTEM AEM survey final inversion data and conductivity models will be available from 7 July 2011 as a free download.


    Completion Of Airborne Geophysical Survey In Northwestern British Columbia

    Posted by on Thursday, 23 June, 2011

    Romios Gold Resources Inc.  announces the completion of a 743 line-kilometre airborne geophysical survey over the Company’s wholly owned Dirk and Andrei properties in the Galore Creek area, Northwestern British Columbia. The geophysical survey employed Fugro Airborne’s “DIGHEM” system, measuring multiple frequency electromagnetic fields to produce high-resolution electromagnetic resistivity and magnetic anomaly maps of the top 150 metres of the earth’s crust. The DIGHEM system, in development and use for over 40 years, is widely used in the mining and exploration industry and has aided mineral exploration at other properties in the area such as Newmont Lake, Trek, Galore Creek, and Copper Canyon.

    Preliminary results of the Fugro survey over the Dirk property suggest a coincidence between a broad, northeasterly striking magnetic anomaly of moderate intensity with a megacrystic syenite porphyry, similar to those found at Galore Creek. Surface mineralization on the Dirk property is reflected as geophysical anomalies exhibiting a high-magnetic, low-resistivity signature within and adjacent to a larger magnetic anomaly outlined in the Fugro Airborne Survey. Together, the broad magnetic anomaly and the anomalies reflecting surface mineralization, cover an area approximately 9.6 km long by 3.0 km wide. A 2010 mapping project from the British Columbia Geological Survey (BCGS) supported Romios’ contention that the Dirk property mineralization is analogous to and may be as large as the Galore Creek Project.

    The Dirk and the recently staked Andrei property are described by the BCGS as holding the potential for VMS (volcanic massive sulphide) – related mineralization. Known silver, zinc, and copper- mineralization within rhyolite ash flows on the Andrei property are manifested in the Fugro surveys as geophysical anomalies which exhibit low to moderate resisivity and moderate magnetic signatures similar to those recorded over the National Instrument 43-101 Inferred Resource of the Northwest Zone on the Newmont Lake property.

    A more comprehensive analysis of the Dirk and Andrei geophysical surveys will be conducted upon receipt of the completed and final results from Fugro Airborne Surveys. Maps of the preliminary results will be posted on Romios’ website.

    The airborne geophysical survey is part of the $6+ million 2011 exploration program which also includes approximately 10,200 metres of diamond drilling on the Trek property, 1,200 metres on the Dirk property, and 400 metres on the Newmont Lake property.

    Drilling commenced on June 2, 2011 on the Tangle and North Zones at the Trek Property. The first hole has been completed on the Tangle Zone and has encountered variable amounts of sulphide mineralization. This mineralization correlates well with the IP (induced polarization) and MT (magnetotelluric) anomalies identified in the 2010 Titan 24 Survey. Drilling on the second hole on the Tangle Zone is in progress.

    Drilling has also commenced on the first hole of the 2011 season in the North Zone targeting the near surface mineralization and the deeper MT anomaly identified by the 2010 Titan Survey. All drilling results will be announced as soon as they are available.


    Completion of Airborne Geophysics Survey at Key Lake for uranium

    Posted by on Tuesday, 24 May, 2011

    Kirrin Resources Inc.  announces the completion of a 1,531 line-kilometre helicopter-borne time-domain electromagnetic geophysical survey of the Key Lake Southwest (‘Key Lake SW’) uranium property located on the southeastern margin of the Athabasca Basin in Saskatchewan, Canada. The survey was flown using Geotech Ltd’s Versatile Time-Domain Electromagnetic (VTEM Plus) geophysical system.

    Kirrin has appointed Savaria Geophysics Inc. of Toronto, Ontario, (‘Savaria’) to undertake integration of the prior Fugro airborne Tempest-magnetic survey completed in early 2010 (news release July 6, 2010) and interpretation of the aggregate data acquired by Kirrin. Savaria anticipates submitting its report by end June, following which Kirrin will commence a program of summer fieldwork with the objective of finalizing the selection of drill sites.
    The eastern margin of the Athabasca Basin is home to the most productive uranium mines in the world with roughly 25% of the world’s uranium production coming from this area. Kirrin’s target at Key Lake SW is basement-hosted unconformity-type uranium deposits, similar to Cameco’s basement-hosted Millennium deposit, located about 50 km to the northeast; the Phoenix discovery, located about 60 km northeast; and the former Key Lake mine, located about 35 km east-northeast.

    Geology

    The Key Lake SW property is at the southwest end of the geologically favourable trend that hosts numerous uranium mines and important deposits. Although the property is believed to be somewhat southwest of the margin of the current Athabasca Basin, regolith encountered in old drill holes indicates the Athabasca Supergroup-Wollaston Group basement unconformity was not far above the present ground surface within the property. Discovery of several ‘Ingress style’ uranium deposits, such as Phoenix (up to 117 m below the unconformity), Millennium (up to 100 m below the unconformity), Eagle Point (up to 450 m below the unconformity) and other deposits within the Athabasca Basin, indicates that important uranium deposits can occur from several tens of metres up to a few hundred metres below the unconformity. Hence, there is potential for important basement-hosted uranium deposits to exist within the Key Lake SW property.

    The Key Lake SW property is underlain by Aphebian amphibole, pelitic-psammitic gneisses, iron formation and leucogranite. The Aphebian rocks lie on Archean felsic gneisses. The boundary between the Mudjatik and Wollaston Domains passes through the eastern part of the property. Most of the property lies west of this line. Although the sandstone does not cover any of the eight claims now, the assumption that it once did is reasonable. The unconformity uranium deposit model or a derivative should apply to all of the claims in the property. Basement hosted uranium mineralization discovered at Millennium, southwest of the McArthur mine and new zones in the Collins Bay Eagle mine emphasize the potential to discover a similar style of uranium mineralization on the property.

    Kirrin explores for rare earth elements and uranium. In addition to its exploration activities, Kirrin seeks to enhance its capitalization and the quality of its portfolio through options and corporate development activity.