Posts Tagged VTEM

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.

New Strongly Conductive Target on Feagan Lake Graphite Project

Posted by on Wednesday, 26 March, 2014

Metals Creek Resources Corp.  reports that the company has discovered several conductive electromagnetic targets on its recently staked, 100% owned Feagan Lake Graphite property which is located approximately 7 km due west of  Zenyatta’s hydrothermal graphite discovery.

These new electromagnetic (EM) conductive responses were flown with the VTEM plus time domain system targeting previously identified magnetic lows that resulted in the discovery of several new exploration targets exhibiting similar features to that of Zenyatta’s hydrothermal graphite discovery. One of the EM responses in particular returned a strong conductive response on all channels with an associated magnetic low.

The Feagan Lake claim block consists of 12 claim blocks totaling 175 claim units and is located immediately west and adjacent to Zenyatta’s claim block.  The Feagan Lake property to the best of management’s knowledge has never been flown for EM conductors making this a brand new discovery demonstrating the potential for the area to potentially host additional graphite mineralization.

Metals Creek’s President and CEO, Alexander Stares states, “With the discovery of several new EM anomalies within favorable stratigraphy to host possible additional graphite mineralization, it provides Metals Creek with an exciting new project strategically located adjacent to Zenyatta’s hydrothermal graphite discovery.  This new highly conductive EM target will be the focus of additional exploration work going forward.”

 


Recent investigations of geophysics abilities in aquifer mapping and resource evaluation

Posted by on Thursday, 13 March, 2014

Buried beneath the glaciated terrain, valleys filled with coarse-grained permeable sediments  potentially are great sources of fresh ground water. During the last several years Geological Survey of Canada has been investigating geophysical methods potential, particularly airborne electromagntics, for mapping and resource evaluation of buried valleys.   Spiritwood valley aquifer in southern Manitoba has been chosen for the investigations. Heliborne AeroTEM, VTEM, fixed-wing TEMPEST and MULTIPULSE, ground electrical resistivity and time-domain methods, seismic reflection and borehole data have been involved into the complex analysis. Recently collected ground TEM data for Spiritwood and the report (G.A. Oldenborger and K. Brewer, 2014) has been released: http://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/fulle.web&search1=R=293700.

One of the successful heliborne TEM examples (Legault, J.M., Prikhodko, A., Dodds, D.J., MacNae, J.C., Oldenborger, G.A., 2012. Results of recent VTEM helicopter system development testing over the Spiritwood Valley aquifer, Manitoba. Symposium on the Application of Geophysics to Environmental and Engineering Problems. Environmental and Engineering Geophysical Society, 114–130.):

VTEM-ground

 

 

 

 

 

 

 

 

 

 

 

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Another recent example of the results of a combined seismic and airborne electromagnetic (AEM) interpretation of the shallow Quaternary sedimentsand  bedrock but in British Columbia (Horn River Basin) was presented on Geoconvetion-2013  .

 

 


Recent Airborne EM Survey close to Albany project

Posted by on Wednesday, 12 March, 2014

Xmet Inc. has successfully completed a Versatile Time Domain Electromagnetic Surveying (“VTEM”) survey, comprising 437 line kilometres, over 20,000 acres of recently staked 100% owned Xmet claims on its Blackflake project.
Three electromagnetic (“EM”) bedrock targets were delineated during the latest survey, including a more detailed survey over the Prime Target discovered and announced in Xmet’s December 12th, 2013 news release. Geotech, who flew the survey and assisted in interpreting the results, have concluded that all three of the anomalies extend into the bedrock beneath overburden and limestone cover.
“A tightly spaced VTEM grid survey was flown over our Prime Target in order to obtain higher resolution over the original TDEM anomaly which was originally defined over a length of 1500 meters,” said Alexander Stewart, Chairman and CEO of Xmet Inc. He continued by saying, “VTEM technology provided much deeper penetration than the TDEM survey flown over the Prime Target in late 2013. With this latest round, the conductivity and the size of the Prime Target is confirmed. The Prime Target is defined by an electromagnetic anomaly in bedrock with an associated magnetic low. The target is geologically constrained between two major diabase dykes. Two new bedrock conductors were also discovered which have similar geophysical characteristics. We are very excited about the potential of these targets, and with our ground permits now in place we are getting closer to drilling these targets.
Xmet’s Blackflake Project comprises over 29,000 acres of 100% owned claims approximately 60km to the northwest of Hearst, Ontario and is adjacent to Zenyatta’s Hydrothermal Graphite Deposit. Xmet has now conducted three airborne electromagnetic surveys, VTEM and TDEM, which discovered multiple electromagnetic conductors making the targets highly prospective for further exploration. Xmet has developed an excellent working relationship with the Constance Lake First Nation, with whom the company signed an ongoing Exploration Agreement.


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

Posted by on Saturday, 1 March, 2014

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 renewed Interest in Pecors Magnetic Anomaly-Serpent River Property Near Elliot Lake, Ontario

Posted by on Friday, 21 February, 2014

International Montoro Resources Inc. – The Serpent River Property, Elliot Lake, Ontario claims consist of 10 mining claims (115 units) covering approximately 1,840 hectares located in Gaiashk & Joubin Townships. Recent renewed interest has been shown in the 3 upper northwest claims known as the Pecors Anomaly. Click following for maps/regional geophysical overview http://ow.ly/tNTbz.

Montoro congratulates Kelly Strong, V.P. of Ontario and UK Operations -Vale, in the recent startup of the Totten Mine (Totten lies 40 km to the west of Sudbury and approx. 50 km from Pecors). This is Vale’s sixth operating mine in the Sudbury Basin. A polymetallic orebody with good nickel and copper grades as well as precious metals. Click following for the complete story: http://ow.ly/tLq2T. (See page 1 & 19-34 re the Totten Mine and page 15 re the KGHM Victoria Mine Projects)

The Uranium and Rare Earths discovered in the southwest portion at Serpent River may prove to be a sideshow to another deposit type. In a 2009 summary of the Ontario Geological Survey field work, a strong geophysical anomaly on the claims that was previously thought to be caused by an iron formation was reexamined. The new interpretation on the Pecors anomaly concludes it may be the result of contact style nickel-copper-PGE mineralization similar to that found to the east at Sudbury. Sediment sampling from Pecors Lake has shown high levels of nickel and chromium, lending further weight to this analysis. The total field magnetic anomaly strikes northwesterly and is about 15 km long and about 4 km wide.

PecorsMagAnomaly

Exploration & Development of the Pecors Anomaly:

  • Int. Montoro, Pele Mtn. & Verbina Resources completed a combined VTEM survey in January 2008. An operational report for this survey was written by the contractor Geotech Ltd. in February 2008, Project 7112.
  • 2009 Ontario Geological Survey field work completed- Open File Report 6240; Project Unit 09-004. Compilation Mapping, Pecors-Whiskey Lake Area, Southern and Superior Provinces
  • February 23, 2010 brief prepared by G. Campbell, MSc. – ‘The Pecors Magnetic Anomaly located under Huronian Cover – A Possible Cu-Ni-PGE Target at the Archean-Proterozoic Boundary, Elliot Lake Area
  • May 5, 2010; Int. Montoro commissioned a report on the southern claims group of the Serpent River Property from L.E. Reed Geophysical Consultant Inc.
  • May 20, 2011; Int. Montoro initiates a search for and locates 4 historic boreholes PW #116, 117, 121 & 122 drilled by Rio Algom in 1959 on the eastern side of Pecors Lake. Holes PW 121 & 122 drilled along the south and southwestern edge of the Pecors Anomaly, penetrated the Huronian sediments and encountered underlying basement rocks at depths of 2002 feet (610 meters) and 1477 feet (450 meters) respectively. Information from the drill holes provides some corroboration of the depths from the 3D model as reported in the July 6, 2011 report following.
  • July 6, 2011; Int. Montoro commissions a report ‘Response of the Pecors Magnetic Anomaly‘ from L.E. Reed (“Reed”) Geophysical Consultant Inc. Reed ran the anomaly through a 3 dimensional inversion program (UBC, Mag3D) to develop an understanding of the three-dimensional shape and distribution of the source body for this anomaly. Measurements through a section in the center of the anomaly show a depth of 300 to 400 meters to the top and as much as 1700 meters from surface to the bottom of the magnetic source body. It appears as a broad sill, possibly an intrusion. The maximum dimensions of the entire inversion block are estimated at 7.8 km EW x 3.45 km NS and 2.025 km from surface. Select portions of the Reed Interpretation report are posted on the updated Serpent River project page on the Company website at www.MontoroResources.com
  • February 2014; Int. Montoro is actively engaging stakeholders in the Sault St. Marie & Sudbury Mining Districts to proactively move forward the exploration of the Pecors Magnetic Anomaly.

Other:

Neighboring explorer, Pele Mountain Resources (TSX VENTURE:GEM), has provided the results of an updated economic review of its Eco Ridge Mine rare earth and uranium project in Elliot Lake, Ontario. In its news release dated September 12, 2013, Pele Mountain reports the economic review concludes that the recent increase in mineral resources extends mine life and improves project economics. While this improvement is offset by a reduction in rare earth price forecasts, the net result demonstrates that Eco Ridge economics remain positive.

Int. Montoro is also seeking interested parties in continuing the development of the Serpent River southern portion of its rare earth and uranium property adjoining Pele Mountain’s claims east of Eco Ridge.


Geophysical exploration program in Nicaragua

Posted by on Tuesday, 18 February, 2014

Caza Gold Corp. announces that the Company has initiated the 2014 exploration program at the Los Andes and Pochote properties in Nicaragua. The Company is planning a large airborne geophysical survey and a drilling program which will test 2 of the highest priority gold targets.

Plans are underway to complete a geophysical survey along a 12 kilometer long trend of continuous alteration within the Los Andes and Pochote claims, followed by a drilling program to test two gold targets not previously drill tested during the 2012 Pedregal program. The upcoming drilling will test the Quisaltepe and San Francisco gold zones. Access agreements have been obtained for the San Francisco area and drill access road construction is underway. Negotiations for access in the Quisaltepe area are being finalized. The drilling program is expected to begin, pending contractor scheduling, by April and is planned to complete approximately 10 to 15 holes each 200 to 250 meters deep. A dedicated budget of approximately CDN$1.3 million has been set aside from the proceeds of the December 2013 CDN$2.5 million financing to execute the exploration program.

The Company has contracted Aeroquest Airborne to complete the helicopter based geophysical survey which will cover approximately 36 square kilometers over the Pedregal, Quisaltepe and San Francisco gold targets acquiring versatile time domain electromagnetic (VTEM) and magnetic data along approximately 530 line kilometers at 100 meter line spacing. The survey is scheduled to begin in March pending the importation of the survey equipment and final scheduling of personnel and equipment. Geophysical survey results in conjunction with geochemical results, structural and alteration mapping will further define the drilling locations.

The VTEM and magnetic data are targeting the conductive massive sulfide horizons and the resistive silicified zones associated with large faults and possible areas of gold mineralization. The magnetic portion of the survey will provide additional information identifying the fault zones and deeper porphyry style mineralization and intrusive bodies. The survey will cover the Pedregal area, drilled in 2012, which intersected thick horizons of sulfide mineralization and strongly silicified zones with elevated but sub- economic gold concentrations (refer to Nov. 29, 2012 news release for details) and along the 10 kilometer trend to the San Francisco target at the south end of the zone.

Los Andes High Sulfidation Gold Property, Nicaragua

The Los Andes Property is located approximately 1 hour east of Managua on Highway 7 with excellent access. The property covers approximately 6,575 hectares and is strategically located within the Central Nicaragua Gold Belt between the El Limon and La Libertad Mines of B2 Gold.

The Los Andes property is a high-sulfidation style of gold mineralization.  High-sulfidation gold systems host some of the largest gold deposits in the world with examples such as Yanacocha and Pierina in Peru.  Favorable alteration and mineralization has been traced along the regional northeast trending Los Andes structure for at least 11 km on the Los Andes property.  The extensive alteration system is exposed on the surface and consists of very strong silicification associated with zoned alteration from higher temperature advanced argillic zones surrounded by successively lower temperature argillic, and propyllitic alteration.  The alteration is associated with anomalous values of gold, silver, and highly anomalous levels of indicator metals such as bismuth, tellurium, selenium, arsenic, antimony, and mercury.


Airborne EM before the discovery of wide spread gold-silver-zinc-copper mineralization

Posted by on Tuesday, 18 February, 2014

Bayfield Ventures Corp. announces the completion of a National Instrument (NI) 43-101 Technical Report on the Company’s 100% owned mineral rights “B” Block gold-silver property, Rainy River district, north-western Ontario.

 

 

 

 

 

 

 

 

 

Drilling on the “B” Block property has resulted in the discovery of wide spread gold-silver-zinc-copper mineralization. No mineral resource calculations have been done on the property. Drilling to date has been relatively wide spaced and shallow. All known mineralized intercepts lie within 400 metres of surface. Less than 5% of the drilling on the property has been done below the 400 metre below surface level.

The property is positioned in the eastern portion of the developing Rainy River district. The south edge of the property is located approximately 350 metres north of the near surface position of the Intrepid shoot, located on ground controlled by New Gold. The Intrepid shoot is a SW plunging, robust zone of gold-silver mineralization that has been jointly delineated by Bayfield Ventures and Rainy River Resources since its discovery by Bayfield in December 2011.

Mineralization on the “B” Block is contained within a package of NNE striking, vertically dipping, strongly foliated, sheared and locally folded dacite porphyry wall rocks. Pervasive sericite-silica +/- biotite alteration is developed within the dacite package. Sericite is dominant in the southern half of the property while biotite and silica are well developed in the northern portion.

The interlayered dacite porphyry, argillite and mafic volcanic lithology of the known rock package at the “B” Block are very similar to that found by Bayfield at its nearby Burns Block property. Additionally, discovered gold-silver-base metal mineralization at the “B” Block is hosted within highly foliated dacite intrusive and or volcanic rocks, again, a setting very similar to that at the Burns Block and at other well mineralized zones along the developing district-scale trend.

The drilling of a series of NW trending angle holes across the SW flank of the strong VTEM anomaly in the northern portion of the “B” Block property is also recommended. Drilling in the heart of the anomaly completed in 2013 showed a rock sequence nearly identical that which overlies the Intrepid Shoot in the eastern portion of Bayfield’s Burns Block project.

The survey was flown in two distinct blocks, an eastern block covering the Burns and “B” Block exploration areas and a western block covering the large “C” Block exploration area. Interpretation of the preliminary data is complete and the following drill targets have been identified:

• A strong, discrete conductor in the east-central portion of the Burns Block has been identified and will be drill tested. No previous drilling has been done in this portion of the property. The anomaly is located in the same area as the multi gram surface samples reported above.

• A strong, discrete conductor in the northeast portion of the “B” Block has been identified and will be drill tested. No previous drilling has been done in this portion of the “B” Block property.

• The cesium magnetic data from the “C” Block survey show clear evidence of mafic volcanic rocks in the northern portion of the property. These rocks are separated from interpreted intermediate volcanic rocks by a sharp contact that is very likely a fault. The interpreted fault contact and the area of interpreted intermediate volcanic (dacite or equivalent) rocks present top quality drill targets at the “C” Block. Drill testing of this area is planned for the first quarter.


Multiple conductive anomalies within the Patterson Uranium Prospect

Posted by on Friday, 14 February, 2014

Makena Resources Inc. reports that the initial data (VTEM survey) has returned results that show multiple conductive anomalies within the Patterson Uranium Prospect. Two distinctive anomalous zones were encountered. The southern zone has three specific targets within the zone. The north target is a NW trending zone associated with a break in the formation in the direct vicinity of the conductive anomaly. A historical drill hole shows basement to be relatively shallow at 154 metres depth within these zones.

Karl Schimann stated, “We are encouraged by the preliminary data. We clearly have multiple conductive targets that we plan to aggressively follow up on shortly. Of particular note is the relationship of the conductive zones associated with the breaks in the magnetic pattern. These breaks are often associated with uranium mineralization. We look forward to potentially confirming these anomalies by ground EM and follow by drilling to determine if these targets have associated uranium mineralization.”

MKN’s Patterson Uranium Prospect, consists of three claim blocks totaling 6,687 hectares (16,524 acres), which are all located in the Athabasca Basin. The west block directly borders the recent discovery on the Patterson Lake South Property by Alpha Minerals Inc. and Fission Energy Corp. The other two blocks are in the direct vicinity of the discovery.


Exploration drilling for gold initiated by airborne geophysics results in Ghana

Posted by on Friday, 14 February, 2014

Asante Gold Corporation  announces final results and interpretation of the exploration drilling completed to date on the Fahiakoba gold concession in Ghana.

Drill holes were spotted to test sections of airborne geophysical (MAG/VTEM) and ground auger soil geochemical anomalies. Initial drill holes were spaced from 400m to over 1km apart and later tightened to 100m step-outs where gold mineralization was noted. A total of 30 drill holes were completed in two phases, for 4985 m. A collar map is available at:http://www.goknet.net/Asante/FAHcollarsNRJan20.pdf.

Geotech conductivity depth inversion

With the exception of four significant gold intersections (to 0.50 m @ 295 g/t Au), initial sampling results were low. VTEM conductors correspond with favourable graphitic shear zones in meta-greywacke or regional scale graphitic meta-phyllite/argillite units. Weak gold anomalies in core from saprolite have generally accounted for the anomalous auger soil geochemical targets tested in the program.

However, wide zones of moderate to strongly quartz veined meta-greywacke, and carbonate alteration were noted in the program. These zones correspond with elevated to locally significant gold values, as noted in the table below, and are considered high priority targets for additional drilling.

Further drilling is also required along the trend to the NE of Perseus Mining Ltd’s discovery hole NSRC010 located ~1 km south of the Asante Fahiakoba concession boundary and which yielded 30m at 2.2 g/t Au, including 4m at 9.0 g/t Au (Perseus Quarterly Report, December 30, 2012 – true width unspecified).

 

Property Geology

The property is underlain by favourable Birimian meta-sediments, with more than 70% of the Fahiakoba concession covered by transported alluvial material. No modern exploration or drilling has taken place to date. Recent airborne geophysical surveys have outlined some 20 km of strong NE trending shear and fold zones, some of which have associated VTEM conductors. These type of structural targets at Perseus and elsewhere in Ghana host significant gold deposits and will be the target of our ongoing exploration efforts. Anomalous gold values have been noted in a pit with quartz stockwork in granite that is associated with one of the airborne geophysical targets. Phase 1 auger drilling to test below the alluvial cover has been completed with anomalous gold trends identified.


Planned airborne geophysical survey looking for an economic graphite deposit at Blackflake property

Posted by on Monday, 10 February, 2014

Xmet Inc. announces that it has engaged Aeroquest International to complete a new round of Versatile Time Domain Electromagnetic (“VTEM”) and Magnetic Gradiometer Survey on its newly acquired 20,000 acres of 100% owned claims which expanded Blackflake’s total area to 29,400 acres. The airborne survey will begin in the next few days.

“This will be our third round of EM aerial surveys and with the exploration success Xmet achieved with its first two EM surveys, we are excited about the potential for this next round of VTEM,” said Xmet’s Chairman and CEO Alexander Stewart.

He continued by saying, “Our primary objective remains to drill test our prime anomaly, disclosed in our news release of December 12, 2013, for which permits for ground geophysics and drilling are expected to be received this month. However this newly acquired land and the further upside potential that the VTEM can deliver is equally exciting.”

Embedded in this news release is a MAP depicting Blackflake’s Eastern Claim Block. As per the map’s legend, the yellow portion within Xmet’s claim block denotes Xmet’s land package prior to January 30th, 2014 News Release and the horizontal grid lines within Xmet’s claim block denotes the 20,000 acres of new claims staked along with the area that will be flown in this round of VTEM.

To view the map accompanying this press release please click on the following link: http://media3.marketwire.com/docs/XME0204.pdf

Bill Yeomans, P. Geo, states, “Given the highly conductive nature of graphite deposits, VTEM is a very effective method for locating potential graphite and massive sulphide type deposits. The new VTEM survey, which will cover approximately 473 line kilometres, is excellent for locating conductive anomalies as well as for identifying lateral and vertical variations in resistivity.”

About Blackflace…


Drilling and Discovery Update at the Miller Graphite Project with airborne and ground geophysics

Posted by on Friday, 7 February, 2014

Canada Carbon Inc.  provides an update on the advancement of its winter exploration program on the Miller Mine property. Shortly after drilling began in December, it was halted due to the discovery of VN3, a graphite vein that is two metres thick on surface and continuous along strike for five metres. Drilling was re-directed to the VN3 discovery, and real-time electromagnetics (“EM”) were employed to identify new drill targets in the area.

R. Bruce Duncan, CEO & Director of Canada Carbon Inc. stated, “We continue to be pleasantly surprised by the prolific nature of graphite mineralization at Miller. The VN3 discovery is a wide graphite vein at surface over a large airborne EM anomaly, making it a high priority for re-evaluating graphite potential in this area. We continue to investigate this area using real-time ground geophysics to rapidly identify targets for drilling in the second phase of our winter program.”

Previously, the Company announced a minimum 1000-metre drill program of NQ-sized diamond drill holes to test several VTEM anomalies (see news releases, December 3, November 14, 2013). Drill hole DDH13-09 confirmed that the E2 anomaly is associated with a sulfide-rich intersection with minor disseminated graphite. Drill hole DDH13-10 targeted the E3 anomaly and encountered a wide intersection of minor and disseminated graphite in marble. During movement of the drill to the E3 drill site, a graphite-rich vein (VN3) was exposed over two metres in width and along strike for five metres before pinching out.

The VN3 discovery was subjected to drilling with six shallow drill holes targeting the vein at depth and along its projected extension on strike and at depth. The winter campaign encountered bad weather, which slowed down the overall drilling production. A total of 547 metres in nine holes was completed in this phase of the program. Maps showing the DDH location can be found at:

DDH Location Link: www.canadacarbon.com/miller-graphite-project

The most significant results are from the new vein discovery VN3 where drilling in core hole DDH13-15 encountered 48.60% C graphite (Cg) over 1.8 metres, including 63.20% Cg over 0.5 metres. This intersection of graphite occurs 4.6 metres (vertically) beneath the VN3 showing. DDH13-14 intersected a graphite vein grading 50.50% over 0.30 metres in 3.50 interval metre interval grading 6.80% Cg between the surface and the DDH13-15 graphite mineralization. The VN3 showing remains open at depth.

The other hole of interest is hole DDH13-11, which targeted a wollastonite-graphite pod located 22.5 metres southeast of the VN2 showing in the trench area. The hole was successful in extending the mineralization hosting the pod to a depth of 8.19 metres (vertically) beneath the surface showing. Grades similar to other graphite pods (see news release dated November 25, 2013), specifically 8.10% Cg over 2.3 metres including 11.00% Cg over 0.90 metres. The pod southeast of the VN2 showing is suspected to be within the same mineralized corridor that extends to at least 39.3 metres (vertically) beneath the VN2 showing. The mineralized corridor also remains open at depth.

The new vein (VN3) discovery triggered the Company to halt the drill campaign and perform a ground electromagnetic survey over the large VTEM anomaly surrounding target E3 to find the best targets before drilling resumes. Dubé & Desaulniers Geoscience Ltd. (Ottawa) was engaged to perform a ground electromagnetic survey using the PhiSpy system. This portable time-domain EM system enables the detection of conductive rocks at optimum depths of 10 to 20 metres, with the results seen in real time on a display screen. This allows for the strongest anomalies to be immediately identified for further testing.

The PhiSpy survey was performed over a 0.11 square kilometre area centered on VN3 with line spacing between 10-20 metres for a total of 12.7 line kilometres. The survey identified 14 anomalies ranging between 5 and 54 metres in maximum dimension. The widest anomaly was discovered in the vicinity of the E3 target identified previously by Geotech, and the Company is currently working with Geotech to re-interpret their results to include the PhiSpy data. Additional data from the core and surface showings will also be incorporated to identify drill targets in this area.

Winter field work including trenching, beep-mat and TDEM surveys, and prospecting is currently underway on the new PhiSpy anomalies in the VN3 area. Drilling will resume once reinterpretation of all results are complete. Existing targets include the new VN3 showing, the trench area where the VN2 surface mineralization is established to a depth of 39.3 metres, and the E1 anomaly, located 800 metres north of the Miller mine pit. Geophysical maps indicate that E1 lies between two magnetic anomalies that may correspond to a lithologic contact of two geological units having a similar geological context to that of the known Miller mineralization (see news release, November 14, 2013).


VTEM Max Survey Commenced by TAD on Uranium Prospect in the Athabasca Basin

Posted by on Wednesday, 29 January, 2014

 

 

 

TAD Mineral Exploration Inc.  announces that the initial work program consisting of a VTEM max program over its uranium block in the Patterson Lake Area of the Athabasca Basin, Saskatchewan has commenced. This survey will assist in locating the basement indicators on the property.

James Nelson, a director of TAD stated, “We are pleased to be underway on this project. When you consider the exposure that the Athabasca Basin has garnered, especially in the light of the recent significant new discovery made by Fisson at the Patterson Lake South property, we are excited to be active on a prospect in this uranium district.”

According to Aeroquest, “The VTEM max or Versatile Time Domain Electro Magnetic system is the most innovative and successful airborne electromagnetic system to be introduced in more than 30 years. The proprietary receiver design using the advantages of modern digital electronics and signal processing delivers exceptionally low-noise levels. Coupled with a high dipole moment transmitter, the result is unparalleled resolution and depth of investigation in precision electromagnetic measurements. The system was designed to be field configurable to best suit a large variety of different geophysical requirements from deep penetration to optimizing the discrimination within a narrow range of resistivity values.”

TAD has added three new prospects. One new prospect is located in the world renowned uranium district of the Athabasca Basin in Saskatchewan in close proximity to the Alpha/ Fission Patterson Lake South discovery. Another new prospect is the Iskut copper/gold prospect near Colorado Resource’s ‘North Rok’ discovery in British Columbia. A third new project is a hydrothermal graphite prospect bordering Zenyatta Ventures Ltd.’s recently discovered deposit.


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


Radon Survey Commences to Prioritize Untested Conductors for uranium in Athabasca basin

Posted by on Monday, 13 January, 2014

FISSION URANIUM CORP. announces it has commenced a new large coverage, $500,000 Radon in lake survey at its 100% owned Patterson Lake South (PLS) property in Canada’s Athabasca Basin. The survey is following up on ten geophysics-identified basement electromagnetic (EM) conductors. Fission’s lake bottom technique survey, conducted in the winter beneath the ice, and analysis has proved key in identifying radioactive anomalies and assisting accurate drill targeting in the previous two drill programs at PLS (>86% mineralization hit rate). To date, Fission’s highly successful Radon survey and analysis has been used systematically on only 1 EM conductor (PL3B conductor) on a property which hosts over 100 such basement EM conductors.

The ten conductors are located in 4 separate areas (Area A, B, C and D) beneath Patterson Lake and Forest Lake.

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

Our lake bottom, winter radon survey and analysis techniques were critical elements in targeting the first strike holes at six of the seven zones and numerous successful step-outs. PLS is a hugely prospective property with a multitude of conductors and just as our understanding of the geology has evolved in the past two exploration programs, so too has our use of Radon survey technology. With approximately 20% of the upcoming drilling focusing on exploring new areas of interest, we expect this radon survey to play an important role in targeting and prioritizing new holes.”

News Highlights

  • 10X expansion of radon survey coverage at PLS
  • Areas to be targeted include a total of ten high priority EM conductors
  • Survey has already commenced and is expected to take five to six weeks to complete
  • Fission’s use of radon has been instrumental in targeting the first holes at six zones found to date and successfully hitting step outs as large as 390m
  • A total of 2,300 samples will be taken from 4 areas covering discrete identified EM conductors. Areas A, B and C cover EM conductors within Patterson Lake. Area B covers EM conductors within Forrest Lake, located immediately to the south of Patterson Lake – all areas are on the PLS property
  • Forest Lake Radon Survey Area

An EIC (Electret Ionization Chamber) survey to measure radon, will be conducted by RadonEx Exploration Management, of St Lazare, Quebec. The survey will comprise primarily samples of measurements of radon in water.

Area A

Area A is comprised of a group of 4 main north-east trending EM conductors, including the PL3B EM conductor (which is associated with the high-grade “R” zones). The upcoming survey will cover 3 parallel interpreted time domain electromagnetic (TDEM) conductors, each discrete conductor ranging in strike length between 1.0km – 1.9km strike length. A total of 743 samples will be collected.

Area B

Area B is located approximately 2 to 3km north-east of the PL-3B conductors. The survey will cover a single 1.2km long north-east trending EM conductor. A total of 231 samples will be collected.

Area C

Area C encompasses two discontinuous north-east oriented and segmented airborne EM conductors (VTEM). The northern conductor is interpreted to be segmented in 2 sections, of strike length of 1.2km and 0.3km respectively. The southern conductor is similarly segmented in 2 sections of 0.7km and 0.3km each. A total of 305 samples will be collected.

Area D

Area D encompasses three intermittent north-east trending VTEM conductors. Two conductors cover a strike length of 4.1km, while the 3rdcovers a length of 1.3km. A total of 1,031 samples will be collected.

Patterson Lake South Property

The 31,039 hectare PLS project is 100% owned and operated by Fission Uranium Corp. PLS is accessible by road with primary access from all-weather Highway 955, which runs north to the former Cluff Lake mine and passes through the nearby UEX-Areva Shea Creek discoveries located 50km to the north, currently under active exploration and development.

 


Linking Porphyry Deposit Geology to Geophysics via Physical Properties

Posted by on Tuesday, 7 January, 2014

Geoscience BC Releases the Report:

Linking Porphyry Deposit Geology to Geophysics via Physical Properties: Adding Value to Geoscience BC Geophysical Data
by Dianne Mitchinson, MDRU; R.J. Enkin, GSC; and C.J.R. Hart, MDRU.

Regional geophysical surveys were flown in 2007 and 2008 as part of the QUEST and QUEST-West projects to improve geological understanding in Quaternary sediment-covered areas and thereby encourage mineral exploration. As part of the ongoing process of adding value to Geoscience BC datasets, Project 2009-001, “Integrated Geological & Geophysical Porphyry Models: Adding Value to Geoscience BC Geophysical Data (NTS 93E, 93K, 93L, 93M, 93N)” was undertaken to define relationships between geophysical datasets collected as part of these QUEST surveys and porphyry deposit geology at six known porphyry deposits. The deposits chosen for investigation include: Mount Milligan, Endako, Huckleberry, Bell, Granisle and Morrison. 
Geoscience BC Report 2013-14 presents physical rock property data from the six above-listed BC porphyry deposits, and discusses observed trends within the detailed QUEST and QUEST-West geophysical datasets and mapped geology. The resulting physical rock property data compilation has implications for improving interpretations of geophysical data from porphyry deposits. A synopsis of physical property criteria defining hydrothermally altered or mineralized rocks in BC porphyry settings is provided, which can ultimately be used for ranking similar mineral exploration targets throughout BC, thereby minimizing exploration risk.

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Porphyry deposits surveyed during the QUEST and QUEST-West projects include Mount Milligan, Endako, Huckleberry, Bell, Granisle, and Morrison. Airborne magnetic and electromagnetic surveys (VTEM or AeroTEM) were conducted over each of these deposits. Additionally, a ZTEM (Z-axis tipper electromagnetic) survey was completed over the Mount Milligan deposit as a joint initiative between Geoscience BC and Terrane Metals Corp.

2009 : AeroTem Survey Results from the Equity Silver Mine
- Mineral Exploration Roundup Poster (pdf, 3.96MB)

Technical Article: 2009: “QUEST-West Geophysics in Central British Columbia (NTS 093E, F, G, K, L, M, N, 103I): New Regional Gravity and Helicopter-Borne Time-Domain Electromagnetic Data”
- Summary of Activities 2008, Report 2009-1 p.1-6 (pdf, 4.64MB)

 

 

 

 

 

Geophysical Surveys

 

 

Technical Article: 2007 : “Airborne electromagnetics and airborne gravity in the QUEST Project area, Williams Lake to Mackenzie, British Columbia (parts of NTS 093A, B, G, H, J, K, N, O; 094C, D)”
- Summary of Activities 2007, Report 2008-1 p.1-6 (pdf, 6.81MB)

Suggested Reference: Mitchinson, D.E., Enkin, R.J., and Hart, C.J.R. (2013): Linking Porphyry Deposit Geology to Geophysics via Physical Properties: Adding Value to Geoscience BC Geophysical Data; Geoscience BC, Report 2013-14, 116 p.

Report Components


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.