Posts Tagged spectrometry

Integrated airborne geophysics and geologic data interpretation for new Eskay-Creek style deposits

Posted by on Wednesday, 9 April, 2014
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Dolly Varden Silver Corporation announces that through recent geoscience modeling and ongoing interpretation, the Company has focused its primary advanced exploration target areas on three corridors within the Dolly Varden property. Work is now being done to prioritize the most prospective drill-ready targets within these corridors. The corridors and targets were chosen for their potential to best expand areas of known high-grade silver mineralization and to identify new Eskay-Creek style precious metals deposits.

 

 The three targeted corridors are the 1) Torbrit-Red Point Corridor – following known silver mineralization underneath Red Point, an Eskay-Creek style target; 2) Musketeer Corridor – which runs along the east side of the Kitsault river with numerous Ag-rich epithermal vein-type showings with strong potassic radiometric signatures; and 3) Wolf-Surprise Corridor where an Eskay-Creek style host formation containing silver-rich VMS mineralization was identified by the Company’s 2011 drill program.

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Through recent modeling and ongoing interpretation, the Company has now moved from kilometer scale targeting to meter scale targeting within these defined corridors. The Company’s technical team is working to delineate specific drill ready targets within these corridors. An aggressive 40 to 50 hole (13,500 meter drill program) is being finalized, subject to financing.
The combination of airborne MAG, VTEM, ZTEM radiometric, and geochemical data, along with geological and structural mapping, was used to define priority target zones. These helped define steep linear features, syngenetic faults, lithologic contacts related to basin formation, and key fluid controlling structures. In addition, key rock units, contact zones and alteration zones most likely to be associated with mineralization, were identified.
This compilation has demonstrated that the known deposits, showings, and related alteration zones are all located within a rift setting. The key rock units that infill the rift have also been identified, and these represent viable targets for Eskay Creek style VMS mineralization. Drilling will be conducted within corridors where mineralized occurrences and coincident alteration haloes point to extensive hydrothermal fluid flow. The key target areas for 2014 drilling include syngenetic VMS-style mineralization and associated feeder structures.

High Resolution Airborne Geophysical Survey in Tanzania

Posted by on Sunday, 19 January, 2014

Geological Survey of Tanzania (GST) and Ministry of Energy and Minerals of Tanzania have organized the Workshop “Launching High Resolution Airborne Geophysical Data at Julius Nyerera Convention Center (17 January, 2014, Dar es Salaam, Tanzania). Around 150 delegates have attended the workshop from government and private sectors.

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Geotech Ltd. and Sander Geophysics have finished the airborne magnetic, gravity, electromagnetic (VTEM), radiometric surveys in 31 districts and presented some results of the surveys.

Permanent Secretary (PS) of Ministry of Energy and Minerals Mr.Eliakim Maswi said – the surveys were carried out under the Sustainable Management of Mineral Resources Project, saying the purpose of the survey was to identify potential zones of mineralization. “The main objective of the project is to improve the socioeconomic impacts of mining for Tanzania and Tanzanians and therefore enhance local and foreign investments”, said PS.

GST Chief Executive Officer , Prof. Abdulkarim Mruma said: “geophysical data acquired through the high resolution airborne geophysical surveys allow fast and accurate delineation of mineralised targets and when augmented with geological and geochemical datasets are highly effective in attracting new exploration ventures.” Prof. Mruma noted that the availability of the modern geo-scientific  data will stimulate investments into mineral and other sectors and will improve the effectiveness of exploration programs.

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Photo: A.Prikhodko


The Results of a Three Methods Airborne Geophysical Survey Over the Kirkham Property in BC

Posted by on Friday, 20 December, 2013

Metallis Resources Inc. announces the receipt of a report summarizing the results of an airborne geophysical survey over its Kirkham Property (the “Property”), situated in the prolific Golden Triangle area of northern British Columbia. The helicopter-borne versatile time domain electromagnetic (VTEM), magnetometer and gamma-ray spectrometry geophysical survey covered 57 km2 of the Property at 250-metre line spacing.

These data indicate a number of anomalous electromagnetic zones (conductors) are present across the survey block. Refer to the attached map for reference. Several of the isolated VTEM anomalies are coincident with conductors that were identified by earlier airborne surveys. In general, electromagnetic (EM) anomalies follow magnetic trends, are commonly associated with local magnetic anomalies and show good correlation with thorium/potassium ratio gamma-ray anomalies.

The isolated anomalies could correspond to the volcanogenic massive sulphide (Eskay Creek -type) or the shear/vein (Snip Mine-type) exploration models. The large anomalies could be related to porphyry copper/gold systems (i.e. Red-Chris, Galore Creek, and Mt. Milligan).

A 2 km diameter area of magnetic high (>100nT) with coincident low resistivity occurs in the north-central part of the survey area. The area’s low resistivity character is interpreted to be caused by alteration and possibly sulphide mineralization. The elevated magnetism is interpreted to be the expression of an intrusive body which could be the source for the mineralization discovered to date. A weak thorium/potassium ratio high coincides with this area consistent with a dioritic composition intrusion. According to apparent resistivity depth imaging over selected lines, the estimated depth to the top of this target is roughly from 50 to 100 meters. This anomaly corresponds to a large gold-in-soil anomaly where numerous mineralized veins were discovered in the 1980s by trenching through the deep overburden. A channel sample of a vein from one of these trenches returned 16.2 g/t (grams per tonne) gold over 0.4m. Another channel sample assayed 1.72 g/t gold over 6m. The whole area of the anomalous mag/EM response is deemed prospective for discovery of new mineralized zones.

One of the major coincident VTEM/magnetic/radiometric anomalies is correlated with the known distribution of the Hawlison monzonite which belongs to a suite of Jurassic alkali feldspar-plagioclase-hornblende-porphyries. Compositional similarities would suggest that the Hawlison monzonite be grouped with the Eskay Porphyry of the Texas Creek Plutonic suite. At the south end of the above mentioned quartz monzonitic intrusive, a zone of increased EM response, again associated with a magnetic low, occurs on the west side of the mapped intrusive, and in the vicinity of mineralized showings. In particular, a strong conductor occurs at the west end of one of the survey lines. A limited amount of drilling and trenching has identified copper and gold mineralization occurring over a 3.5 kilometer-long section of this intrusion. In 2010, Paget discovered a zone of higher grade copper-gold mineralization of up to 1.3 g/t gold and 0.57% copper extending up to 1.5 kilometers south of existing drilling. Fourteen rock chip samples of quartz-sericite-pyrite altered porphyry with quartz-chalcopyrite veins and stockworks averaged 0.4 g/t gold and 0.22% copper, including values up to 1.3 g/t gold and 0.57% copper. Twenty-two rock samples, including eight historical sample assays, from the 190 metre wide zone average 0.7 g/t gold and 0.35% copper.

Directly west of the 2 kilometre sized magnetic/resistivity anomaly mentioned above, a localized EM and magnetic response occurs on two lines near the base of a steep north facing slope. This response is particularly interesting since regional geochemical silt sampling downslope generated highly anomalous Cu/Zn/Au/As values. The directly associated negative 300nT response suggests remanence magnetism from a body emplaced at a time when the earth’s field was reversed. Modeling of the VTEM electromagnetic response suggests a 15 Siemen, west dipping, approximately 300 metre long target at a shallow depth of about 40 metres. The combined strong geochemical and geophysical response is interpreted as a possible gold bearing massive sulphide target. It occurs about 200 metres west of the Hawlison monzonite. This target is about 20 kilometres southwest of Eskay Creek mine.

The isolated conductors have not been tested to date and represent very attractive targets suitable for follow-up. In several cases, these conductors are related to silt and soil geochemical anomalies or prospective rock-types such as rhyolites.

All of the airborne geophysical information is being interpreted by a senior geophysical consultant in order to outline and define the significant anomalies that were identified.

These anomalies should be evaluated by mapping, soil geochemistry, ground geophysics and trenching in order to define a prioritized set of drill targets.


Geoscience Program in Colorado

Posted by on Wednesday, 18 September, 2013
NEOS GeoSolutions, Inc. announced that it has secured underwriting for a multi-client, integrated geological and geophysical program in Colorado, the second project NEOS has undertaken in the state this year. This newly announced neoBASIN™ project covers 3,000 square miles over the Denver-Julesburg (D-J) Basin, a sedimentary basin that reaches its deepest point near Denver and then extends northward into southeastern Wyoming and the western parts of Kansas and Nebraska. NEOS’s Denver-Julesburg geoscience program has been designed to provide a regional view into the subsurface from the basement through the target reservoir intervals, including the liquids-rich Niobrara shale. By applying an advanced geostatistical technique known as predictive analytics, NEOS will be working on behalf of the project’s underwriters to identify the geological and geophysical measurements and attributes that correspond to the best producing wells in the area of investigation and to determine where similar areas occur in less developed parts of the survey area.
Lance Moreland, Director of Rockies Programs for NEOS, commented, “We’ll be acquiring new airborne geophysical datasets – magnetic, electromagnetic, radiometric, and gravity –and integrating these with existing seismic and well information. We’ll analyze all of the acquired datasets individually, but also interpret them simultaneously to determine the measurements, attributes, and derivatives that correspond with the best wells in the basin. Our predictive analytics methodology will then ‘pattern search’ for these same measurements in less developed parts of the area being studied. This is our standard neoBASIN workflow, though we’ll tailor it slightly to test some of the specific hypotheses operators have about the drivers of Niobrara productivity, including basement topography, basement faulting, and regional intrusive activity.”
The neoBASIN survey is being exec ted under a multi-client commercial model. The window for late underwriters will close on January 15, 2014. Final results should be available to the project underwriters in the first half of 2014. To learn more about NEOS’s multi-measurement methodology for oil & gas exploration and development, read the white paper at: tinyurl.com/MMI-WhitePaper. To learn more about NEOS’s regional imaging programs in the D-J, Piceance, and Sand Wash basins of Colorado, visit: tinyurl.com/neos-Colorado.


Airborne Geophysical Survey Underway at Brahma/Austral Project

Posted by on Wednesday, 18 September, 2013

Condor Resources Inc.announces that MMG Chile Exploration SPA (“MMG”), a subsidiary of MMG Limited, has commenced an airborne geophysical survey over Condor’s Brahma/Austral porphyry copper project in southern Chile.

The survey is being conducted by New-Sense Geophysics Limited and includes airborne radiometrics and magnetometer surveys utilizing a Eurocopter AS350 B3. Approximately 3000 line-kilometres will be flown at 150m line-spacings, and it is anticipated that the survey will be completed before the end of September.

Condor recently signed an agreement giving MMG a 270 day exclusivity period to conduct a mandatory due diligence program at Brahma/Austral, which due diligence includes the airborne survey, and follow up mapping and sampling. If MMG decide to proceed with an option agreement, they will be required to complete cumulative exploration expenditures of US$7 million, and complete a Preliminary Economic Assessment, both within 6 years of execution of the option agreement, in order to earn a 70% interest in Brahma/Austral.

The Brahma/Austral concessions cover some 186 sq km situated southeast of the city of Talca in southern Chile. The project is located on the southern extension of the West Fissure fault system, the continental scale structure which controls most of the large world class copper deposits located within the central Andes of Chile, including the El Teniente mine located 200 km to the north.

Geology/Mineralization:

In 2006, Dr. Richard Culbert discovered a highly anomalous stream sediment sample at a location called Los Boldos Creek. In 2007 Condor geologists, attempting to locate the source of the copper anomaly within the creek, identified and traced float boulders containing finely-disseminated chalcopyrite and covellite in a pervasive quartz-sericite (“phyllic”) altered quartz feldspar porphyry intrusive (QFP) to a tributary of the main creek and then to an outcrop where copper sulphides occur as disseminations, localized stockwork veinlets and fracture coatings. Subsequent prospecting approximately 300 m vertically above this outcrop located additional pervasive-altered and leached QFP in bedrock, with hematite and lesser jarosite occurring as disseminations, in stockwork veinlets and on fracture surfaces within the intrusive. This type of alteration closely resembles the leached capping commonly occurring above most Chilean porphyry copper deposits. Abundant finely disseminated chalcopyrite, covellite and pyrite occur at the base of the intensely-altered system.


Continuing of geophysical investigations at Patterson Lake for uranium

Posted by on Tuesday, 17 September, 2013

Forum Uranium Corp. announces further exploration of its 100% owned Clearwater Project on trend and immediately adjacent to the southwest of the Alpha Minerals/Fission Uranium Patterson Lake South discovery. Forum conducted ground radiometric prospecting, lake sediment geochemical surveys and soil gas radon surveys in late August/early September.

As a result of this program, further prospecting of airborne radiometric anomalies and expansion of the radon survey will take place. The radon survey has outlined a number of anomalous zones on two grids immediately southwest of the Alpha/Fission claim boundary. These results are very encouraging so the grids will be expanded to cover areas with airborne electromagnetic conductors on strike with the Patterson Lake South conductive trend. Upon completion of this follow-up program, Forum will conduct ground electromagnetic surveys this fall and ground gravity in early winter to outline targets for drilling in late January 2014.


The uranium “BOULDER-FINDING” technology and the application results

Posted by on Thursday, 29 August, 2013

FISSION URANIUM CORP. and Special Projects Inc (SPI, Calgary), are pleased to announce the filing of a patent application for an invention entitled “System And Method For Aerial Surveying Or Mapping Of Radioactive Deposits”. The invention relates to an airborne system and method for surveying a geographic area to detect and map the locations of radioactive geological deposits, such as boulders and clusters of rock.

The invention results in a particularly high-resolution survey and is an improvement over known airborne surveying methods for radioactive deposits. The invention led Fission to discover the high-grade uranium boulder field at its Patterson Lake South (PLS) property in Canada’s Athabasca Basin, home to the world’s richest source of high-grade uranium.

Ross McElroy, President, COO and Chief Geologist of Fission Uranium, commented,

Using our patent-pending survey system, enables us to quickly and effectively explore large areas for radiometric anomalies. Our system has proved to be incredibly sensitive and accurate in locating anomalies of interest and provides a “leading-edge” ability to find occurrences of radioactive soil, boulders and outcrop at surface that may represent uranium.”

Radiometric surveys are regularly employed in exploration to detect and map natural radioactive emanations (from uranium, thorium and potassium), from rocks and soils. Meteorological conditions, the topography of the survey area, the influence of the Earth’s cosmic environment, the height of the sensor above ground and the speed of the aircraft are some of the variables which affect radiometric measurements. The invention resulting from the collaboration between Fission’s technical team and SPI is particularly sensitive to addressing these variables.

Prior to the Fission/SPI invention, airborne prospecting for radioactive minerals has been generally carried out by flying a fixed wing aircraft equipped with large detectors relatively high altitudes and high speeds over a geographical region to be surveyed. However, data collected in such a manner often does not allow for detection of localized geological deposits such as boulders and clusters of rock due to the large footprint of the measurement and the resulting background-to-boulder signature ratio. Additionally, many legacy systems, which used a combination of towed magnetometer sensors and large detector systems, lacked the electronic navigation and data acquisition tools required to collect and compile the information in a manner required to detect localized geological deposits.

The Fission/SPI invention utilizes a fixed wing aircraft using at least one radiation detector element to fly at an ideal height and speed over a geographic area and store the radioactive signal data. Furthermore utilizing advanced processing technology to map the radiation signal data to accurately identify and flag high priority points, which in the case for PLS resulted in the discovery of the high-grade uranium boulders.

FISSION URANIUM CORP. announces the discovery of two significant and strongly radioactive uranium source anomalous regions on its 100% owned North Shore property in the Athabasca Basin, Alberta. The Northern and Southern anomalies occur within the south-central part of the project area near the southern boundary. The discovery was made using Fission and Special Project Inc’s (‘SPI’) high resolution magnetic and radiometric airborne survey technology which is currently patent-pending (see news release July 16, 2013).

The Northern anomalous region occurs within a 1.5km x 0.5km area and contains several parallel trends up to 300m.  The Southern anomaly is located approximately 7km to the SW of the northern anomaly and is characterized by being narrow (1 to 10m wide) and can be traced for up to 3km.

Ross McElroy, President, COO, and Chief Geologist for Fission, commented,

We are very encouraged by this strongly radioactive discovery, particularly as we used the same technology to locate the boulder field at Patterson Lake South (PLS). While the expansion of our PLS discovery is our main task, following up these new results at our North Shore property is also a priority.

In August 2013, using a fixed wing aircraft, SPI flew a 12,257 line km high resolution airborne magnetic and radiometric survey at 50m line spacing over the entire North Shore project.  The radiometric system uses a calibrated gamma spectrometer which is able to differentiate between uranium, thorium and potassium and also determine the relative concentration of each element.

The radiometric data was collected and processed and anomalies were picked based on elevated total counts with correlated elevated uranium concentrations.  The width and responses of the peaks indicate that some of the larger anomalies present are likely to be part of the outcrop/sub crop as opposed to boulders.  This is indicated by a generally wider anomaly which is easily seen on multiple lines.


Airborne EM and radiometric surveys for Saskatchewan uranium exploration

Posted by on Thursday, 8 August, 2013

Noka Resources Inc. announces that the members of the Western Athabasca Syndicate; Noka Resources Inc.Skyharbour Resources Ltd., Athabasca Nuclear Corp., & Lucky Strike Resources Ltd.(“the Syndicate”) have completed large-scale VTEM plus and radiometric geophysical surveys on the Western Athabasca Syndicate Project located near Alpha Minerals’ and Fission Uranium’s  Patterson Lake South (“PLS”) uranium discovery. The original airborne coverage was expanded to provide for the infill and extension of conductive anomalies and structural features identified by a preliminary review of the geophysical data. Based on this initial encouraging data, the Syndicate has elected to immediately commence the second phase of its summer program consisting of follow-up field work and ground-truthing of geophysical targets.

Western Athabasca Syndicate Project Claims Map: http://www.nokaresources.com/images/NX-Western-Basin-Syndicate.jpg

Completion of Regional Airborne Geophysical Survey:

A total of 4,840 line kilometres was flown for the VTEM plus time domain survey with an additional 4,400 line kilometres flown for the radiometric survey all of which was on the Syndicate’s Preston Lake Property. The VTEM plus system has been used successfully to locate basement conductors similar to the structures that host the high-grade uranium discoveries at the nearby PLS project. The high resolution radiometric survey was flown to locate uranium boulder trains, in-situ uranium mineralization and alteration associated with uranium mineralization which is what ultimately led to the PLS discovery by Alpha and Fission. Phil Robertshaw (P.Geo., Saskatchewan) is reviewing the collected data and will be providing detailed interpretation of the VTEM plus and radiometric surveys shortly.

Western Athabasca Syndicate Airborne Survey Coverage: http://nokaresources.com/images/NX-Geophysics-coverage.jpg

The areas flown include two blocks in the northern part of the Preston Lake Property. The Preston Lake South block is contiguous with Fission Uranium and NexGen Energy and includes a large area of partially exposed pre-Cambrian shield rocks. The Preston Lake West block claims are contiguous with claims controlled by Aldrin Resources and Forum Uranium. The claims are underlain by Phanerozoic rocks (limestone and sandstone) similar to the PLS discovery area. At Fission and Alpha’s PLS high-grade discovery it is interpreted that the uranium has been mobilized along the fault zones and has been concentrated in the sandstone under the limestone. A review of historic data on the Preston Lake Property has identified a sample collected by the Geological Survey of Canada which returned a value of 5.4 ppm U3O8, considered to be significant in an area with a background uranium value of 1 ppm U3O8. This high U3O8 value may indicate either the down-ice glacial transport of uranium boulders from source or an in-situ source of uranium. For comparison, the highest value down-ice from the PLS discovery is 3.2 ppm U3O8. Management cautions that past results or discoveries on proximate land are not necessarily indicative of the results that may be achieved on the Western Athabasca Syndicate Project.

Commencement of Field Program at Preston Lake Property:

The initial data and results from the airborne surveys have led the Syndicate to expedite the planned summer field program with a number of high-priority targets at the Preston Lake Property being the focus of the work. A sophisticated targeting matrix is being used to further identify and prioritize areas for ground-based follow-up. Field work will include ground-truthing of high-priority geophysical targets using water and soil radon sampling, biogeochemistry, geochemical lake sediment and soil sampling, prospecting, and scintillometer surveying. The Syndicate will employ a systematic, proven and cost-efficient exploration methodology that has led to numerous uranium discoveries in the region and throughout the Athabasca Basin. By the end of this summer’s field program, a total of $1.5 million will be spent in exploration on the project between airborne geophysical surveys and follow-up ground work.

Uranium and the Athabasca Basin:

The Athabasca Basin of northern Saskatchewan hosts the world’s largest and richest high-grade uranium deposits accounting for just under 20% of global primary uranium supply. Athabasca uranium deposits have grades substantially higher than the world average grade of about 0.1% U3O8. The Patterson Lake area has received escalating exploration attention and claim acquisition activity as a result of the new, shallow discoveries made by Alpha and Fission which includes the recently reported drill interval of 6.26% U3O8 over 49.5 metres in drill hole PLS 13-053. This mineralized zone is located approximately 400 metres to the northeast of discovery hole PLS 12-024 which returned 2.49% U3O8 over 12.5 metres. Consistent high grade, near surface U3O8 assays from Alpha and Fission demonstrate the potential for high grade uranium mineralization on the margins of the western side of the Athabasca Basin. There are still areas in the Athabasca region that are highly prospective and underexplored for high grade uranium as illustrated by Alpha’s and Fission’s recent discovery.


Airborne EM and radiometry in Western Athabasca

Posted by on Tuesday, 23 July, 2013

Noka Resources Inc. announces that the members of the Western Athabasca Syndicate; Noka Resources Inc. Skyharbour Resources Ltd. , Athabasca Nuclear Corp., & Lucky Strike Resources Ltd.(“the Syndicate”) have completed an additional 720 line kilometres to the 4120 line kilometre VTEM plus time domain geophysical survey on the Western Athabasca Syndicate Project. The additional coverage consisted of infill and extension of conductive anomalies and structural features identified by a preliminary review of the geophysical data.

The Syndicate is also pleased to announce that the high resolution airborne radiometric survey on the Western Athabasca Syndicate Project has started. The contract was awarded to Goldak Airborne Surveys who will be collecting radiometric data be using a digital acquisition system that is proprietary to Goldak. A total of 4400 line kilometres at 200 metre line spacing will be flown using a 50.4 liter crystal volume detector to locate uranium boulder trains, in-situ uranium mineralization and alteration associated with uranium mineralization systems.

The Syndicate is using Phil Robertshaw (P.Geo., Saskatchewan) to review the VTEM plus and radiometric data and provide detailed interpretation when the surveys are completed.

Western Athabasca Syndicate Project claims map


Geophysical surveys in Colombia for VMS

Posted by on Thursday, 18 October, 2012

CuOro Resources Corp. announces that Geotech Ltd. of Aurora, Ontario (“Geotech”) has been engaged to complete a 416 line-kilometre, helicopter-borne versatile time-domain electromagnetic (“VTEM”) survey of the Santa Elena Copper-Gold Project, in Antioquia Department, Colombia.

Geotech’s VTEM system has been shown to be excellent at identifying conductive, massive-sulphide bodies as well as mapping lateral and vertical variations in resistivity. The VTEM system is also equipped with a high sensitivity magnetometer which can aid in mapping geologic structure and lithology.

The survey is expected to be completed during October 2012. The Company will immediately investigate any targets generated by the survey with exploration and drilling.

Santa Elena Overview

Santa Elena is classified as a bimodal-mafic VMS deposit. This type of deposit is similar to that found in many of the major district of the Precambrian Shields of Canada, Western Australia, and Scandinavia, as well as the Urals and in the Cretaceous of Peru. The latter is comprised of the giant Tambo Grande deposits; TG1 and TG3, adjacent deposits comprising a single ore system contain a non 43-101 compliant resource of over 138 MT of 1.3% Cu and 1.1% Zn. The Tambo Grande deposits are in a very similar setting to the Santa Elena occurrence, and given that both are in what appears to be an oceanic back-arc setting, this district may be a model for Santa Elena. It is important to note that VMS deposits almost always occur in districts, and that their sizes are log-normally distributed.

The concessions contain 1,287.5 hectares near the north end of the Antioquia batholith, at the intersection between the San Pablo formation (Cretaceous marine sediments) located to the north, the basaltic volcanic flows located to the west, and the Antioquia batholith quartz-diorite complex to the east.

The infrastructure is excellent and includes paved road access, two hydroelectric plants within 5 km, and abundant water supply.

Geological mapping and sampling has identified 3 VMS areas of outcropping (TEM-1, TEM-2, and TEM-3) all of which coincide with historical geophysical anomalies. Several new mineralized outcrops have been located recently south of the known VMS outcrops.

Recently completed geophysical surveys have validated the historical data, as well as produced many new targets which will be drill tested.

Summary of Geophysics

A surface geophysical TEM survey at 50 m intervals was conducted on a selected area of the property where outcropping mineralization was visible. The survey was conducted by VAL D’OR Geophysics for Noranda Mining and Exploration Inc in 1996-1997.

The historical ground geophysics had identified 4 strong conductors with good vertical extent, 3 of which are coincident with the TEM-1, TEM-2, and TEM-3 outcrops.

An airborne magnetometer and radiometric survey was flown in August 2011. These surveys were followed-up by ground based induced polarization and resistivity surveys. These surveys validated the original survey data, and also generated several new drill targets which are currently being drill tested.

The company plans to initiate down-hole TEM surveys along with additional induced polarization and resistivity surveys in January 2012.


The New Potential Ni-Cu targets in Tanzania

Posted by on Friday, 7 September, 2012
IMX Resources Limited reports the identification of twenty-five new high priority VTEM anomalies from the recently completed airborne magnetic and versatile time-domain electromagnetic (VTEM) survey over selected areas within the Nachingwea Nickel-Copper JV Project located in southeast Tanzania.
The delineation of multiple late time EM anomalies further enhances the regional prospectivity of the Nachingwea JV property. Of potential significance is the identification of a high amplitude late time EM anomaly coincident with the Hog gold prospect, where surface gossan sampling returned values of up to 4.96 g/t Au and 0.64% Cu (ASX: May 28, 2012).
Patricia Tirschmann, VP Exploration, commented: “We are pleased to have completed another successful regional VTEM survey and are very encouraged by the number of high quality targets generated. The identification of an EM anomaly coincident with the Hog gold prospect further enhances the exploration potential of this target and we look forward to drill testing it and other high priority targets beginning in September.”
The airborne geophysical survey was carried out by Geotech Limited of South Africa employing the Versatile Time-Domain Electromagnetic (VTEM) geophysical system. The survey ran from July 29th to August 11th and a total of 2,409 kilometers were flown in five flight blocks.
The flight blocks comprising the 2012 airborne VTEM survey were selected by prioritizing areas based on results of the 2010 airborne magnetic and radiometric survey in combination with results of geochemical sampling and geological mapping. Preliminary data from the new VTEM survey is currently being evaluated, and targets are being selected for ground follow-up in order to help prioritize anomalies for drill testing later in the year.
Analysis of the preliminary VTEM data indicates that EM anomalies have been detected on each of the five flight blocks and approximately twenty-five of these represent high priority anomalies with late channel responses. Of potential significance is a high amplitude late time EM anomaly detected on three 200 metre spaced flight lines which is coincident with the Hog gold prospect where surface gossan grab samples returned values of up to 4.96 g/t gold and 0.64% copper (May 25, 2012 Press Release). Several other VTEM anomalies are also confirmed to have coincident copper and/or nickel in soil anomalies.
The Company plans to carry out 1,500-2,000 metres of reverse circulation drilling to test selected high priority regional VTEM and geochemical anomalies including the Hog gold prospect. This drilling is currently expected to begin in mid-September.

Exploration activity at Nachingwea has identified several zones of nickel sulphide mineralisation, at Ntaka Hill, where a combined Measured and Indicated Resource of 12.79 million tonnes (Mt) grading 1.21% Ni (using a 0.2% Ni cut-off) has been announced. The resource equates to an estimated 154,700 tonnes of contained nickel.

In addition, an Inferred Mineral Resource of 45.04Mt @ 0.3% Ni (using a 0.2% Ni cut-off) has been identified at Ntaka Hill.

A positive scoping study for an open pit mining operation means that the Nachingwea project is now advancing towards a potential production commencement date in 2015.

Read more..


Helicopter Magnetic and Radiometric Survey on Anza Property in Colombia

Posted by on Saturday, 16 June, 2012

Waymar Resources Ltd.  announces the completion of a 2,867 km helicopter magnetic and radiometric survey, covering approximately 260 km2, over their Anzá project in Antioquia, Colombia. Preliminary data images can be found on the Waymar website at the following links:

http://www.waymarresources.com/_resources/maps/RTPAnza_image1.jpg

http://www.waymarresources.com/_resources/maps/RTPAnza_image2.jpg

http://www.waymarresources.com/_resources/maps/RTPAnza_image3.jpg.

The survey was completed by MPX Geophysics Ltd., of Markham Ontario, at a nominal altitude of 70m and 100m traverse line separation. The results will be used to aid geologic mapping, identify structures and alteration associated with hydrothermal mineralization and possible porphyry copper-gold systems within the project area. The survey data is currently being processed by MPX and final products are expected by July 2012.

Waymar has also completed a structural evaluation using Radar images over the entire area of the land package held in the Anzá district. The images were acquired, processed and interpreted by Alto Americas S.A., of Buenos Aires, Argentina, a company that specializes in remote sensing products and services.

“The preliminary geophysical data confirms that the Aragón structure, which controls the gold mineralization at the Anzá deposit, is a continuous, district-wide feature,” commented Pablo Marcet, CEO. “The combination of Magnetics and Radiometrics is giving us a powerful tool to identify and prioritize targets in our extensive land package. Together with the interpreted Radar images, previous geological mapping and geochemistry, we have an excellent technical base to start testing the numerous exploration targets in the district. Meanwhile, we continue to drill at Anzá and aim to release a new batch of drill results before the end of June.”

Peter Diorio, P. Geo., President of GeophysicsOne Inc. is the qualified person related to the helicopter magnetic and radiometric survey and has reviewed and verified the technical disclosure contained herein and accepts responsibility for such disclosure. David Makepeace, M.Eng., P.Eng., senior geologist for Micon International Limited is the qualified person for the Anzá drill program, as defined by National Instrument 43-101.

There has been insufficient exploration to define a mineral resource at the Anzá property to date, and it is uncertain if further exploration will result in targets being delineated as a mineral resource. Any potential quantity and grades are conceptual in nature.


Geophysical Targets on the Cerro Quema Property

Posted by on Tuesday, 29 May, 2012

Pershimco Resources Inc. announces the results of the geophysical survey recently completed over its 15,000 Ha 100% owned Cerro Quema property. These are the first high resolution geophysical surveys completed over the entire extent of the concessions.

These preliminary results and associated interpretations highlight the following:

  • Numerous new geophysical targets with similar magnetic, radiometric and electromagnetic signatures as those over the La Pava and Quema/Quemita gold resources.
  • Induced Polarization (IP) survey results correlate well with drill hole assays that show gold and copper mineralization associated with strong silicic alteration and deeper chargeable sulphide zones.
  • These new geophysical results have generated additional drilling targets along strike of known resources at La Pava and Quema/Quemita.

Induce Polarisation Survey (IP)

The purpose of the IP survey with an effective depth down to 200m, was to define and expand on the known near surface resistive zones associated with silicic alteration which host gold mineralization at the La Pava project. An additional objective was to define and expand on the deeper chargeability and conductive zones known to be associated with the copper/gold mineralization as previous drilling results earlier published by the Corporation have confirmed.

The resistivity map shown below highlights a robust resistivity anomaly with approximate dimensions of 400m x 300m. This resistivity anomaly is coincident with the La Pava project with gold mineralization hosted in the oxide zone of a silicic altered volcanic unit. This IP anomaly has also highlighted a northerly and westerly extension of this resistive unit located outside of the current pit design. These extensions will require drill testing to evaluate their potential.

The chargeability map highlights a chargeability anomaly of approximate dimensions of 600m x 350m. This chargeability anomaly coincides with deeper sulphide mineralization identified by drilling at the La Pava and Chontal projects.

Figures 3 and 4 shown below show selected profiles (A-A’ and B-B’) of resistivity and chargeability results respectively over the La Pava project.

The Corporation is encouraged by these IP results over the La Pava and Chontal projects which clearly outline the mineralized host units present. Combined with the preliminary airborne geophysics interpretations, the Corporation will now complete additional IP geophysical surveys over the Quema/Quemita project and additionally over the newly identified targets identified by the airborne geophysics.

Airborne survey (VTEM-Mag-Rad)

The airborne survey was completed using a total field magnetometer, a gamma-ray spectrometer (U, Th, K) and a time domain vertical axis electromagnetic system (VTEM). This survey entirely covers Pershimco’s 100% owned Cerro Quema project in Panama. The objective of the survey was to define the magnetic and radiometric signatures of the LaPava and Quema/Quemita resources and additionally to identify similar signatures within the property.

Figure 5 shows a reduced to pole of TMI image. This figure highlights the low magnetic susceptibility with coincident low potassium and high Th/K ratio signatures over the La Pava, Quema/Quemita and Chontal projects.

Figure 6 highlights numerous new geophysical targets with similar signatures both within and along strike of known mineralization in La Pava and Quema/Quemita resources.

Alain Bureau, President and CEO, states: “We are very pleased with the recently completed geophysical surveys and the associated interpretations. These results have confirmed our in-house geological and mineralization models. The follow-up of these new targets will now allow us to evaluate the full potential of our Cerro Quema property in Panama.”

http://www.pershimco.ca/NouveauSite/pdf/Communique_de_presse_29_05_2012_ANG.pdf


Prospective Geophysical Anomalies on Cerro Quema, Panama

Posted by on Friday, 4 May, 2012

PERSHIMCO RESOURCES INC. announces additional results from its drilling campaign as well as strong geophysical results which have been received on the airborne campaign covering its 100% owned Cerro Quema Project in Panama. Results of the preliminary geophysics signatures are considered very significant and Management has decided to immediately release the initial interpretation. Complementary information will be available during the upcoming weeks. A few days ago, Pershimco completed an airborne geophysics survey covering all of its 15,000ha Cerro Quema property covering the “Trend” including the LaPava and Quema targets as well as the continuity towards the east.

The survey has been realized by Geotech Ltd. from Toronto using, amongst other techniques, radiometric and magnetic signatures as well as VTEM procedures. Preliminary results already show a strong signature revealing a continuity along the east-west trend through the whole concession showing additional repetitive magnetic and radiometric signatures revealing similar anomalies as LaPava and Quema targets. These signatures will be focused on over the next months in order to build additional mineral resources to the project. South of the “Trend”, a significant high conductivity footprint has also been detected at depth. Pershimco is presently proceeding in the final treatment of the data. Geotech will complete detailed Resistivity Depth Imaging, which includes Resistivity Sections line by line to define the conductors’ geometry with depth, and also will complete 3D magnetic inversions. The footprint is also highlighted by Th-K ratio lows which correlate perfectly with the magnetic sources which will lead to a full analysis of all merged results including the ground IP realized earlier. The Corporation has posted on its web site a map resulting from the Mag survey. Additional tools and maps will be posted as they become available.Mr. Alain Bureau, President and Chief Executive Officer of Pershimco commented on the geophysics: “We were positive about the continuity of the “Trend” and this signature shows the fantastic potential of this oxide corridor. This project still has a lot to offer and to be discovered. The strong conductivity footprint observed south of LaPava also brings us additional information on our deeper sulfides systems.”


Airborne Magnetic and radiometric survey in Congo

Posted by on Monday, 23 April, 2012
Kilo Goldmines Ltd.  announces the following exploration update on its Somituri project:
Completion of an Airborne geophysical survey over the entire 122 square kilometre Exploitation Licence, that hosts the Adumbi gold deposit of the Somituri Project situated in Oriental Province of the Democratic Republic of Congo (“DRC”).
Completion of soil sampling and reconnaissance geological mapping on PE9692, PE138 and PE137
New Resolution Geophysics, based in South Africa, carried out an airborne Magnetic and Radiometric survey over PE9691, by helicopter, in mid April 2012. The survey consisted of 1,416.5 line kilometres flown at 100 metre intervals on a magnetic azimuth of 040° – 220° in order to orthogonally traverse the lithologies and gold bearing shear zones. The objective of the airborne geophysical is, in part, to better define the structural and lithological settings of the known gold deposits and gold occurrences hosted on the Exploitation Licence and the on-strike extensions of these structures in areas where they have not been exposed or exploited. In addition, the magnetics can determine the presence of younger intrusive rocks, and cross-cutting structures that are typically associated with shear hosted Archaean orogenic gold deposits as well as differentiate between the Banded Iron Formation (“BIF”), metasediments, volcanic and other rock types to complement geological mapping.
Airborne Magnetic and Radiometric survey was previously completed over PE 9692, PE 137, PE 138, PE 140, and 9695.
Since January the Company has completed soil sampling and reconnaissance geological mapping on PE9692, PE138 and PE137. Soil sampling and reconnaissance geological mapping is in progress on PE9695. The objective of this program is to delineate areas of anomalous gold values in soil, and ultimately define drill targets.
The Somituri Exploitation Licences are located in the Archaean Ngayu Greenstone Belt. Gold on PE 9691 (location of the Adumbi Deposit) is hosted within quartz veins in sheared Upper Kibalian formation comprised of a chemical metasedimentary unit that includes banded iron formation (“BIF”), tuffaceous metasedimentary rocks and greywacke. Similar rock types, as well as occurrences of massive haematite are present on 6 of the remaining PEs of the Somituri Project. One PE is underlain predominantly by basement orthogneiss and granites. The youngest lithology on the property is the Post Karoo, essentially a lateritic cuiriasse.
Also present within the Kibalian formation is quartzitic sandstone often with pyrite, pellitic and graphitic shales and horizons intercalated with fine quartzitic sandstone, banded sericite schists, quartz-sericite schists, phyllites, spotted schists and red banded shale. Gold bearing quartz veins are hosted within the Kibalian formation.

IP Survey Results over the Lucas Gold Target

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

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.