Posts Tagged uranium

Airborne Geophysical Survey Along Trend Of The Alpha/Fission Patterson Lake Discovery

Posted by on Tuesday, 28 May, 2013
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Forum Uranium Corp. announces the commencement of an electromagnetic and magnetic survey of its 100% owned Clearwater Project. Forum’s claims, staked immediately adjacent to the southwest of the Alpha Minerals/Fission Uranium claim boundary is interpreted to be on strike with the fertile conductive trend that hosts the high-grade uranium discovery on the Patterson Lake South project. Forum’s property lies only four kilometres southwest of the high grade boulder train on the Alpha/Fission property.

Figure shows historical electromagnetic trends, a magnetic map and lake sediment geochemical surveys in the Patterson Lake South area. The electromagnetic (EM) surveys stopped at Forum’s claim boundary, however EM conductors from these historic surveys trend in the direction of Forum’s ground. Of particular note is that the highest lake sediment value in the area lies on Forum’s southwest claim with a value of 8.3 ppm U. Most values are between 1 to 3 ppm U and the lake sediment sample taken down-ice from the Patterson lake boulder field was 3.2 ppm U.

An Aeroquest Airborne helicopter-borne time domain electromagnetic survey with Bfield-VTEM Plus and magnetic gradiometer system will be flown on 200 metre line spacings for a total of 647 line kilometres over Forum’s 99 square kilometre property. The VTEM Plus system has been chosen for its depth penetration and vertical/spatial resolution of graphitic conductors that are prospective hosts for unconformity-style uranium deposits.

This is the first phase of this year’s summer exploration program. Plans are to conduct an airborne radiometric survey and a detailed prospecting survey to search for any boulder fields similar to that found on the Alpha/Fission ground.


Advances in Airborne and Ground Geophysical Methods for Uranium Exploration

Posted by on Tuesday, 30 April, 2013

IAEA (International Atomic Energy Agency) has published a book “Advances in Airborne and Ground Geophysical Methods for Uranium Exploration”.

“Due to growing global energy demand, many countries have seen a rise in uranium exploration activities in the past few years, and newly designed geophysical instruments and their application in uranium exploration are contributing to an increased probability of successful discoveries. This publication highlights advances in airborne and ground geophysical techniques and methods for uranium exploration, succinctly describing modern geophysical methods and demonstrating their application with examples.”

Download..


Ground/airborne geophysics evaluation for uranium mineralization

Posted by on Thursday, 1 December, 2011

Unity Energy Corp. announces that it has completed evaluation of ground/airborne geophysics and historical drilling in and around the Lampin Lake Project and has identified a high value target, dubbed the Shamus Zone. The Lampin Lake Project consists of a single 500ha disposition located on the eastern margin of the Athabasca basin. The Project lies in the Waterbury Lake district, ~16km southeast of Hathor’s Roughrider discovery. It is bordered by claims held by UEX to the east (Hidden Bay Project) and Cameco on all other sides.

To view the map associated with this press release, please click on the following link: http://media3.marketwire.com/docs/u1129.jpg

 

The Shamus Zone is characterized by a 500-750m wide northwest trending Bouguer Gravity low feature, beginning at Cameco’s Q12A zone and ending several kilometers on the southwest corner of the Lampin Lake claim boundary. The gravity anomaly is roughly perpendicular to the Telephone Fault, may indicate a region of alteration, some of which has been subject to desilicification. The Telephone fault is interpreted as the primary control of this zone. Within gravity anomaly, the primary target is a series of subtle conductors coincident with magnetic lows, which appear to be related to extensions of Cameco’s Q12A conductor series. The subtle conductors were identified through detailed interpretation of VTEM data, acquired by Unity in a survey completed in 2011.

Cameco’s Q12A zone (some 500m to the south) shows areas of intermittent uranium mineralization at the unconformity and has been interpreted as the outlying edge of an alteration zone. Cameco and Asamara Oil have tested the Q12A zone with several ground geophysical surveys and extensive diamond drilling. Asmara Oil’s diamond drilling of the Q12A grid intersected notable uranium mineralization as follows: Q12A-009 (4.0m of 0.13% U3O8 @ 197m), Q12A-003 (0.4m 3159ppm U3O8 @ 219.9m) and Q12A-005 (0.3m 0.073% U3O8 @ 180.1m), The most significant hole reported by Cameco was Q12A-011: 1.7m of 2.46% U3O8 at ~192m.

It is the Company’s exploration hypothesis that the absence of strong conductors near or at the Telephone Fault may be a result of graphitic consumption or remobilization by alteration events. Several major uranium discoveries in the Athabasca Basin such as McArthur River, Key Lake and Millennium were primarily the result of drill-testing of strong alteration zones related to conductor features, not the drill testing of specific graphitic conductors. The Key Lake and Millennium deposits, which were initially missed in first-pass drilling, were discovered by step-out fenced holes drilled across alteration zones. Millennium was discovered by drilling “off conductor” and deeper into a basement alteration system. McArthur River was found by drilling along the strike-trend of a pronounced alteration system where conductors were largely absent. The Company is in the process of evaluating “next step” exploration phases. A ground survey (such as gravity, resistivity or 2D seismic) would likely precede diamond drilling.

 

Anita Algie BSc. Hon., President, commented, “Unity now has high value targets on both of its Waterbury Lake assets: Lampin Lake and Waterbury Lake. It is the Company’s intention to explore and develop these highly prospective properties, with or without venture partners. In addition, the recent bidding war for Hathor by Cameco and Rio Tinto has reaffirmed in the minds of investors worldwide the viability of uranium as an exploration commodity. This may well be the black swan event that renews the uranium renaissance.”

Dr. Peter Born, P.Geo., the Company’s Qualified Person and Director, has not reviewed the original drill logs, assays or core of historic drilling. Geological and exploration information contained in this release is derived from sources believed to be credible.

 


Airborne surveys for uranium in Athabasca Basin

Posted by on Tuesday, 27 September, 2011

Unity Energy Corp.  announces that it has acquired through staking a prospective uranium exploration property known as the Milliken Lake Property. The 1,941 hectare claim lies on the eastern edge of the Athabasca Basin, adjoining to the southeast, UEX’s Hidden Bay and to the west Hathor’s Milliken Creek Project. The project area has seen significant exploration activity, including an Aeroquest AeroTEM III time domain helicopter electromagnetic survey in 2005 (UEX) and boulder prospecting survey (Denison) in 2006. With this acquisition, Unity now controls eight quality uranium exploration projects (27,500 hectares) in the most productive region in the world.

Aeroquest’s Mag/EM survey was successful at detecting a northeast trending moderately conductive anomaly, spanning ~4.5km of the Milliken Lake Project. The Milliken Conductor, which appears to be a subtle anomaly that may represent an alteration zone corresponding with a magnetic low, is the Company’s primary exploration target at Milliken Lake. In 1997, Cameco tested a gravity anomaly in the northern portion of the Project, which was then part of the Park Creek Project. The unconformity was intersected at 97.4m (hole GL-1) and 87.95m (hole GL-2). Neither hole intersected alteration or mineralization; the holes were approximately one kilometer north of the Milliken Conductor.

The Company also covered the Milliken Lake Project in its 2011 VTEM survey; an interpretation on the results should be available in the near term.

Unity Energy Corp. has completed a heliborne VTEM geophysical survey over its Close Lake, Lampin Lake, Hoppy Lake, Kirkpatrick Lake and Dickens Lake projects in the northeastern Athabasca basin and La Ronge gold belt. The survey consisted of about 3,385 line kilometres with 100-metre spacing. Unity is awaiting preliminary interpretation and will use the data to refine target zones.

VTEM is highly effective at locating discrete conductive anomalies, magnetic features extending to the basement. It is also highly effective at mapping lateral and vertical variations in resistivity and is a leading-edge solution for uranium exploration in the basin. VTEM is an evolving technology and this latest generation boasts a higher sensitivity achieved by noise reduction and the optimization of transmitter current waveform, along with dipole-moment increases. The low noise level significantly extends conductance aperture and conductance discrimination.

The Athabasca Basin is an ancient sedimentary basin which hosts the World’s most significant uranium mines and produces almost 30% per cent of the current world uranium production of 108 million pounds U3O8. Athabasca uranium deposits also have grades substantially higher than the world average grade of about 0.2% U3O8. The two dozen or so known uranium deposits within the Athabasca Basin have average grades of more than 3.0% U3O8. The two largest deposits, Cigar Lake and McArthur River have average grades of 20% and 24% U3O8 respectively. The near surface uranium mines in the Cluff Lake mine area produced more than 60 million pounds of uranium with gold as a by-product.

The Athabasca Basin is host to unconformity-associated type Uranium deposits. Mineralization occurs at, above or below the unconformity which separates the Proterozoic Athabasca Sandstone Group from the underlying metamorphosed gneissic rock. Uranium mineralization within the Athabasca Basin is primarily hosted by meta-sediments including pelites and calc-silicates and by sandstone of the Athabasca formation. The pelites are commonly graphitic (free carbon) which may have acted as a chemical reductant, fixing uranium from water circulated by large hydrothermal systems. Some Athabasca uranium deposits are associated with faults and these faults may cause displacements of the basal unconformity.


The new uranium exploration target zones through EM and gravity analysis

Posted by on Thursday, 15 September, 2011

Unity Energy Corp. announces that it has identified five distinct exploration target zones at its Lampin Lake Uranium Project, which adjoins UEX’s Hidden Bay Project and is located ~16km southeast of Hathor’s Roughrider discovery. The zones were identified through a detailed analysis of VTEM data, historical Bouguer Gravity and diamond drilling to the south by Cameco (Dawn Lake Project).

Zones A, B and C are were identified through the VTEM as conductive anomalies that exist within magnetic lows that could not be explained by surface features, conductive lake or stream sediments. Zones D and E were identified as highly conductive anomalies that exist within a magnetic low. Zone C is particularly interesting. This ~1.5km long zone is open to the west and roughly parallels the Q12-A Zone, a conductive series that lies less than 500m south of Lampin’s southern boundary in the Telephone fault. Exploration of the Q12-A EM conductor, by Asamera and subsequently Cameco, led to the discovery of a large alteration zone. The best hole Q12-A-009 (1982) intersected ~4.0m of 0.13% uranium mineralization at a depth of 196m, this being at the unconformity. It is the Company’s hypothesis that mineralization is controlled by a faulting structure that exists within the boundaries of the Lampin Lake Project, just to the north of the conductive series. An “off-conductor” exploration model, along the lines of Hathor’s Roughrider Deposit, Denison’s Phoenix Zone or Cameco’s Millennium Deposit, has been proposed.

The proposed exploration model is that the deposition of uranium mineralization exists within an alteration zone which is often marked by a graphitic horizon which can be highly conductive and therefore detectable by geophysical techniques. Magnetic lows in the survey may indicate possible faulting or breaks in the basement rock through which mineralized fluids have penetrated and deposited uranium at the basement or within the overlying sandstone. Together, the existence of a conductor in association with a magnetic low can form a compelling exploration target. The company’s next step is to examine conductivity depth sections along prospective VTEM flight lines to model cross sections of the target zones. If warranted, targets would then be examined by ground geophysics and then diamond drilled.

 


Airborne electromagnetic data and inversion models for two regions in Australia

Posted by on Sunday, 3 July, 2011

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

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

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

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

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

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


3D Exploration Models for Targeting New Uranium Deposits in the Athabasca Basin

Posted by on Saturday, 2 July, 2011

JNR Resources Inc. reports that it is continuing to develop 3D exploration models to target new uranium deposits on its properties in the Athabasca Basin. JNR is a Saskatoon-based junior exploration company with one of the strongest technical teams in the uranium exploration industry. The Company is focused on uranium exploration in the Athabasca Basin of Saskatchewan and the Deer Lake Basin and Topsails igneous complex of west-central Newfoundland. These regions represent distinct uranium provinces that are characterized by significant uranium enrichment in many of the rock formations. JNR firmly believes that the best exploration approach is through actively exploring on the ground and drilling high-priority targets based on geology, geophysics, and geochemistry.

JNR is one of several uranium exploration companies that is using leading-edge exploration methods and tools in the Athabasca Basin to better understand mineralization processes/criteria for discovering new resources. These methods and tools include PIMA analyses, Pb isotope analyses, APS mineral analyses, 3D GOCAD modeling via a data- and/or knowledge-driven approach, numerical and/or geostatistical modeling, and high-resolution 2D/3D airborne and ground geophysical surveys, including high-resolution airborne gravity (FTG) and electromagnetic (ZTEM) surveys. In this respect, the Company is taking full advantage of the capabilities and expertise of its experienced, multi-disciplinary geological team.

Over the last 20 years, mineral exploration has evolved into a more rigorous quantitative science. A significant part of this exploration science includes a 3D GIS environment in which rich archives of diverse exploration data sets can be integrated, analyzed, and interpreted for the purpose of targeting new ore deposits.  Building these 3D common earth models using the GOCAD environment/software appears to be a very efficient and effective tool for characterizing and exploiting the regional-, district- to mine-scale 3D common earth models of ore deposits and for determining the complex processes that produced the economic mineralization. For example, the complex spatial and geological relationships between lithological units, geological structures, geochemical data, alteration data, and geophysical data can be studied in detail. As well, a wealth of knowledge of ore-forming processes can be integrated into and queried by what-if scenarios within the geostatistical module of the GOCAD environment.

Results to date (2005 – present) from JNR’s 3D GOCAD models (e.g. eastern Athabasca, Way Lake, Yurchison Lake, Moore Lake, and Snowbird/South Dufferin) indicate that we have a much better understanding of the geological environments that we are exploring in and from this we can successfully pick new lithostructural/geochemical/geophysical drill targets in the search for new uranium resources. Ultimately, this will lead to finding new uranium deposits in less time.

In summary, when applied by experienced, multi-disciplinary exploration teams, this data- and/or knowledge-driven mineral potential modeling approach has great potential to enhance greenfield to brownfield mineral exploration activities within all uranium provinces. JNR will next put this to test by drilling some new discoveries along the eastern and southern margin of the Athabasca Basin (e.g. Snowbird/South Dufferin and Lazy Edward Bay).

Dave Billard, Vice President Exploration and Chief Operating Officer comments; “State-of-the-art, science-based exploration techniques are integral to our ongoing and planned exploration programs. For example, we have been able to define superior targets at shallow depths on our South Dufferin/Snowbird projects, which we plan to drill this summer. We believe these targets are lithostructurally related to the Centennial deposit (Cameco Corporation/Formation Metals Inc.) located approximately 20 km northeast and on strike of our properties. At Centennial, a 650-m long mineralized zone grading up to 8.78% U3O8 over 33.9 m has been outlined at approximately 800 m depth (Formation Metals news release May 30, 2011)”.

All technical information for the Company’s exploration projects is obtained and reported under a formal quality assurance and quality control program, details of which are presented on the Company’s website at: www.jnrresources.com/i/pdf/JNR-QAQC.pdf. A glossary of the technical terms included in this release can be found on the Company’s website at: www.jnrresources.com/s/Glossary.asp.


Completion of Airborne Geophysics Survey at Key Lake for uranium

Posted by on Tuesday, 24 May, 2011

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

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

Geology

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

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

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



VTEM Survey on Prospective Uranium Properties in Athabasca Basin

Posted by on Saturday, 23 April, 2011

Unity Energy Corp. announces that it has engaged Geotech Ltd. to conduct a heliborne VTEM geophysical survey over its Close Lake, Lampin Lake and Hoppy Lake Projects in the northeastern Athabasca Basin. VTEM is highly effective at locating discrete conductive anomalies, magnetic features extending to the basement and mapping lateral and vertical variations in resistivity and is a leading edge solution for uranium exploration in the basin. VTEM is an evolving technology and this latest generation boasts a higher sensitivity, achieved by noise reduction and optimization of transmitter current waveform along with dipole moment increases. The low noise level significantly extends conductance aperture and conductance discrimination. The survey will comprise of ~1300 line kilometers with 100m spacing and is expected to be completed within two weeks.

The Company was very impressed at the capability and resolution of the VTEM survey, which in 2010 helped to define three high priority targets at Unity’s Waterbury Lake Project, which is just ~10km south of the Midwest Mine and Hathor’s Roughrider Project. The Company is also in the process of finalizing arrangements for a ground resistivity survey of targets at Waterbury, which should commence in the near term.

Close Lake Project, which is comprised of a singe mineral disposition covering an area of ~596 hectares, is ~10.6km northwest of the Cigar Lake mine. The Tucker NE conductivity trend, which lies immediately north of the CL Property, was delineated by a 1991 Comega (now Areva) ground EM survey and a 2004 MEGATEM Airborne EM & Magnetic Survey. The anomaly was interpreted as a series of 3 or more northeast parallel basement conductive anomalies, the most southerly of which (C-12A) lies ~170m from the northernmost boundary of Unity’s CL property.

The Lampin Lake Project consists of a single 500 hectare disposition located on the eastern margin of the Athabascabasin.  The Property is 3.7km southeast of Unity’s Waterbury Lake Property and is bordered by claims held by Dennison to the east (Hidden Bay Project) and Cameco Corporation on all other side.

From 2004-2006, Cameco tested the northeast trending Q12 EM conductor series with ground geophysics and diamond drilling. EM and gravity surveys allowed for the interpretation of the Q12 fault, as well as numerous cross faults that extend onto the Lampin Lake Property. In addition, a northeast resistivity high, extending for ~750m along the southeastern edge of the Lampin Lake Property was defined by EM inversions.

In September 2002, UEX Corporation and Cameco Corporation commissioned a fixed-wing triaxial gradiometer aeromagnetic survey to cover the entire Hidden Bay and Rabbit Lake properties. Goldak Airborne Surveys of Saskatoon, Saskatchewan was contracted to carry out the survey and a total of 6,816 line kilometres of data was collected along 200 metre spaced flight lines. The data collected from this survey was combined with a project-scale EM conductor map to facilitate a regional geological and structural interpretation. Emphasis was placed on identifying the principal geological units, the most prominent structural features, and the areas most prospective for finding uranium mineralization.

The Hoppy Lake Property covers an area of 1924 hectares and is ~10km southwest of the Cigar Lake Mine.

In 2007, Condor Consulting completed an interpretation report for Dejour Enterprises/Titan Uranium and identified a number of Target Zones deemed worthy of follow-up. The report describes the processing and analysis of several VTEM airborne electromagnetic and magnetic surveys carried out for Dejour by Geotech from September-October 2006. The object of the survey was to explore for unconformity style uranium mineralization of both the Simple (Low Rare Earth Elements, (REE) basement-hosted) and the Complex (High Rare Earth Elements, (REE) sandstone-hosted) types.


Ground Geophysics on Uranium Russell Lake Project

Posted by on Friday, 15 April, 2011

Hathor Exploration Limited provides an update on its Russell Lake exploration program in the southeastern part of the Athabasca Basin in northern Saskatchewan.

Ground geophysics and first-pass diamond drilling were completed during the recent winter 2011 surface exploration program at Russell Lake.

  • Ground gravity surfaces were completed over 3 grids: Key Lake Grid, Grayling East and Grayling West.
  • Key Lake survey (137.5 line-km with 2710 data stations) identified a 4.0 km long NE to ENE oriented, strong gravity low that is at the apex of a magnetic-interpreted granitic dome; a similar geologic setting to Key Lake deposits.
  • Grayling East survey (59.3 line-km with 1233 data stations) identified a E to NE curving gravity low trend that correlates well with previously identified conductors and resistivity-low trends. These form an untested 200 – 600 m wide corridor that is sub-parallel to the Grayling Zone, where historic drilling intersected uranium mineralization including 3.45% U3O8 over 0.3 m and 0.4% U3O8 over 3.75 m.
  • Grayling West surveys (34.3 line-km with 712 data stations) identified the extension of a N-S fault system that is cross-cut by a number of E-W and NE-SW oriented gravity lows.The Russell Lake property is located within the Wollaston-Mudjatic magnetic low transition zone, commonly referred to as eastern corridor of the Athabasca Basin. The greatest endowment of proven resources for future production within the Athabasca is within the eastern corridor, in the region immediately surrounding Russell Lake.

    Recent exploration on the Russell Lake property itself includes airborne geophysical surveys between 2004 and 2007, including a 3,421 line-km Bell full tensor gradiometry survey (airborne gravity), a 6,946 line-km high resolution airborne magnetic survey, and 5,407 line-km’s of airborne EM surveys on three different blocks. Ground-based geophysical surveys were done between 2007 and 2009, including EM, resistivity and gravity. Seismic surveys were also completed between 2005 and 2008 to help delineate major structures. There were 8 holes drilled in 2007, and 27 holes completed in the 2009 winter season on 7 different targets. Alteration and trace element geochemical anomalies were identified but are yet to be followed up. 


2011 exploration program on the Athabasca Basin with HTEM

Posted by on Thursday, 3 February, 2011

Kirrin Resources Inc.  announced plans for its 2011 exploration program.

The Key Lake Southwest (‘Key Lake SW’) uranium property located on the southeastern margin of the Athabasca Basin in Saskatchewan will attract an estimated budget of $0.7 million. Later this month, Kirrin will commence a 1,400 line km. helicopter-borne time domain electromagnetic geophysical survey. Following the interpretation of results, Kirrin is planning a program of summer fieldwork with the objective of finalizing the selection of drill sites.

The eastern margin of the Athabasca Basin in Saskatchewan, Canada, is home to the most productive uranium mines in the world, with roughly 25% of global uranium production coming from this area. Kirrin’s target at Key Lake SW is basement-hosted unconformity-type uranium, similar to Cameco’s basement-hosted Millennium deposit, located about 50 km to the north-northeast, the Phoenix discovery, located about 60 km northeast, and the former Key Lake mine located about 35 km east-northeast. The review of the technical disclosures regarding the recent Phoenix Discovery has revealed many geological similarities between Phoenix and Key Lake SW.

The interpretation of the recent 1,076 line-kilometre magnetic-electromagnetic (EM) airborne survey revealed 19 anomalies for follow-up, 7 of which are first priority. This follow-up will form the basis of the 2011 drilling campaign. Highway 914, which extends from Lac La Ronge to Key Lake, passes less than 2 km from the eastern edge of the property.

Exploration on March 2010 acquisition commenced in April 2010 with a 1,076 line-kilometre magnetic-electromagnetic (EM) airborne survey. The airborne survey utilised Fugro’s fixed-wing Tempest(r) Digital Time Domain Electromagnetic (DTDEM) system which provides maximum quantitative discrimination of relatively near surface (upper 200 to 300 m) conductivity variations.

Airborne magnetic surveys map the variation in magnetic susceptibility, which predominantly results from changes in the percentage of magnetite and some other magnetic minerals in the bedrock. The magnetic variations thus allow the mapping of differing lithologies, faults, potential alteration zones, etc. DTDEM surveys map the three-dimensional variation in conductivity that is caused by one or more of mineralogy (e.g., conductive minerals such as graphite or sulphides), intensity of alteration, water content or changes in salinity. The correlation of the magnetic responses with the EM conductive trends enables the indirect geological mapping of bedrock under overburden and possible Athabasca Basin sandstone outliers. As well, the airborne geophysical data can identify anomalies and potential geological targets that may be spatially associated with uranium deposits or alteration zones near such deposits.

Following the satisfactory results from December’s geophysical interpretation program at the Grevet REE project in northwestern Quebec, Kirrin is planning a three phase exploration season commencing in late April. The first phase will complete prospecting on priority areas, including the collection of samples and assessment of exploration potential. The second phase will primarily identify drill targets and will commence in July. The third phase, commencing in September-October, will be determined by the compilation and interpretation of the results obtained from the earlier 2011 phases and will likely comprise a 1,500 to 2,500 m drill program in 15 to 25 holes.


Uranium exploration update on Athabasca basin with ZTEM

Posted by on Thursday, 13 January, 2011

Athabasca Uranium Inc.  announces the commencement of its multiphase exploration program for the Company’s McGregor Lake and Webb River uranium projects, located on the southeastern margin of the Athabasca Basin, Saskatchewan. The Company is also pleased to provide an update on its current suite of properties.

Exploration Update

Phase One exploration, already underway, consists of a 2,740 kilometer heli-borne Z-TEM (Z-Axis Tipper EM) survey – a leading edge solution, particularly efficient at identifying discrete vertical conductive anomalies at depth. Conductive anomalies existing within magnetic discontinuities are key exploration indicators for altered sandstones and mineralized zones. In the Athabasca Basin, the vast majority of uranium mines and exploration deposits – including Denison’s Wheeler River Project, Fission’s Waterbury Lake Project, Hathor’s Roughrider Zone and JNR/Denison’s Moore Lake Project – are associated with subsurface graphitic conductors.

Results from the Z-TEM survey will be used to further refine conductive anomalies already identified at McGregor Lake and Webb River through previous ground and airborne surveys. Subject to the results, Athabasca will proceed with Phase Two Magnetoteulleric (MT) ground surveys to further identify and refine targets. High priority targets should then be available for Phase Three testing by diamond drilling. Athabasca will also employ 2D seismic surveys, utilized by Hathor at Roughrider and JNR/Denison at Moore Lake, to increase the likelihood of drilling success.

Gil Schneider, Athabasca Uranium’s president was quoted as saying: “Given the current bull market and positive outlook for uranium world-wide, this is a very exciting time to be exploring in the world’s richest uranium region.”

Geotech’s ZTEM system is an innovative airborne EM system which uses the natural or passive fields of the earth as the source of transmitted energy. The earth and ionosphere, both conductive, act as a waveguide to “transmit” the source energy great distances. Due to the manner in which they propagate, these natural fields are planar and horizontal. Any vertical field is caused by conductivity contrasts in the earth. The vertical EM field is referenced to the horizontal EM field as measured by a set of horizontal base station coils. The proprietary receiver design using the advantages of modern digital electronics and signal processing delivers exceptionally low-noise levels.

The 18,699ha McGregor Lake Project adjoins Denison/JNR’s Moore Lake Deposit (Maverick Zone), where significant uranium mineralization has been identified through multiple diamond drill programs. The unconformity related uranium mineralization in the Maverick Main zone has now been intersected over a minimum strike length of 350m. In 2005, Denison/JNR reported intersecting “classic unconformity-style mineralization, best exemplified by holes ML-61, ML-54 and ML-55, where respective intervals of 4.03% eU3O8/10 m (incl. 1.4 m @ 20% eU3O8), 3.5% U3O8/5.0 m and 5.14% U3O8/6.2 m were obtained. In ML-29, returning 1.61% eU3O8/7.5 m, an 0.5 m intersection graded 7.91% U3O8, 3.65% Ni, 2.8% As, 1.6% Cu, 0.9% Co, 0.35% REE and 5.3g/t Ag, confirming the polymetallic nature of the mineralization. Together with the newly discovered 527 and 525 zones, mineralization occurs over a 1.7-kilometre length of the minimum 6.5-kilometre long Maverick structural corridor. Over 50% of this corridor has yet to be drill tested.


Resistivity survey for alteration zone

Posted by on Tuesday, 11 January, 2011

Titan Uranium Inc. announces the analytical results from the Company’s summer 2010 drill campaign and provide an update on a Direct Current (D.C.) resistivity geophysical program conducted this fall on the Border Block project.

Three drill holes were completed for a total of 1504 metres to test favourable uranium targets at or near the unconformity between the Athabasca sandstone rocks and the underlying basement rocks. Analytical results from holes MB-10-01 and CSE-10-01 displayed anomalous Uranium values in the Athabasca sandstone and basement rocks. Anomalous levels of pathfinder elements Boron, Molybdenum, Cobalt, Arsenic, Vanadium, and Lead were also found in the Athabasca sandstone and basement rocks.

CSE-10-01 intersected anomalous levels of Rare Earth Elements, particularly Yttrium, in the Athabasca sandstone rocks. The analytical results also indicated the presence of illite and sudoite clay species throughout the sandstone rocks, generally in areas with the greatest Boron concentrations. In addition, the sandstone and basement rocks displayed evidence of faulting which was typically associated with bleaching and alteration. Boron, illite and sudoite anomalies are typically part of hydrothermal alteration systems associated with unconformity style uranium mineralization in the Athabasca Basin.

Approximately twenty-three line kilometres of Pole-Dipole D.C. resistivity surveys to search for alteration chimneys along the H-Grid Time Domain Electromagnetic (TDEM) conductive trend were completed in November 2010 (see November 03, 2010 press release). This data is currently being assessed, interpreted and compiled for targeting in future drill programs along the H-Grid conductor trend where favourable alteration indicators together with anomalous uranium values were also identified in past drill campaigns (see June 17, 2010 press release).

The Border Block project is located in the southwest area of the Athabasca Basin, near the Alberta border and comprises the Maybelle River, Gartner Lake, King and Castle South Extension properties. The project (76,354 hectares/188,675 acres) covers an area where historic exploration data identified favourable basement rocks capable of hosting uranium mineralization. The basement rocks are thought to be correlative with those  found on the adjacent AREVA/UEX  Corp.’s  Shea Creek  project which hosts  significant uranium mineralization in the Anne, Collette and Kianna deposits.


Athabasca Basin – geophysics underway

Posted by on Wednesday, 29 December, 2010

Virginia Energy Resources Inc.  reports that it has approved a 12-hole, 2300-metre drill program on the Richardson-Crooked Lake target on the Hatchet Lake property in the Athabasca Basin of Saskatchewan.

The drilling is planned for February 2011 and will be preceded by a ground-based Horizontal Loop Electromagnetic (HLEM) survey to refine the position of several shallow conductor targets. The Richardson-Crooked Lake area is located 20 km north of the Tuning Fork target where the JV partners identified unconformity-style mineralization in a winter 2010 drill program (see Virginia News Release of June 29, 2010). In addition, the JV partners plan ground geophysical surveys in 2011 on the adjacent Murphy Lake property.

The 2011 drilling and geophysical survey will target a historically described, six-kilometre-long conductor system with uranium and base-metal enrichment associated with sulphide mineralization and alteration in sandstone and basement rocks. The Richardson-Crooked Lake target is located on the shallow northeast margin of the Athabasca Basin with depths to the basement contact targets varying from zero to 120 metres, well within the limits of low-cost open-pit mining.

While there has been considerable historic drilling in this area, most of the holes were vertical and did not effectively test the steeply dipping conductors. Nevertheless, a number of historic uranium and polymetallic base-metal (Co, Cu, Ni, Zn, As, Au) drill intercepts were reported, including SMDC Hole 61 which intersected “uraniferous sulphide breccia” which assayed 7.34% Co, 1.66% Ni and 16.07% As over 2.5 m (and 5.0 m of 73 ppm U), Hole 74 which intersected 2,112 ppm U, 256 ppm As and 202 ppm Ni over 3.4 m, and Hole HT-96 which intersected 2,600 ppm U over 1.0 m plus adjacent sections which assayed 5.95% Cu over 2 m and 0.612% Co over 2.5 m. The association of uranium with very high base-metal values is very encouraging as it is typical of the “polymetallic” class of sandstone-hosted deposits such as Cigar Lake, Roughrider and the Sue A, B, and E deposits. Most of the holes in this area did not extend far below the unconformity, and therefore, did not adequately test for mineralization in the basement rocks.

The 39,930-hectare Hatchet Lake property is located 25 km north of Points North Landing, and 17 km north of the McClean Lake mill owned by AREVA-Denison-OURD. The target is an unconformity-type or basement-hosted uranium deposit at or near the contact between the Athabasca sandstones and underlying basement rocks. The Hatchet property includes faults and conductors similar to those that host nearby unconformity-related uranium deposits and prospects such as Jeb (Areva-Denison-OURD), Dawn Lake and La Rocque Lake (Cameco-Areva-JCU), Moonlight (Areva-Denison-JCU), Midwest (Areva-Denison-OURD) and Roughrider (Hathor-Terra). For additional background see the Virginia’s February 16 and June 29, 2010 news releases, as well as property maps at www.virginiaenergyresources.com.


REPORTS ON 2010 GEOPHYSICAL EXPLORATION PROGRAMS FROM ATHABASCA BASIN

Posted by on Thursday, 14 October, 2010

Titan Uranium Inc. announces results from the 2010 geophysical exploration surveys in the Athabasca Basin on the company’s 100% owned Bishop II, Meanwell and R-Seven projects. Electromagnetic and resistivity surveys were completed with the objective of detecting conductors and hydrothermal alteration anomalies, respectively.  These features are typically found associated with fault zones and unconformity-type uranium deposits in the Athabasca Basin.

A number of conductors were located by Max Min Horizontal Loop Electromagnetic (HLEM) surveys on Grid BII_2009-1 and Grid M_2009-1 of the Bishop II/Meanwell projects. The conductors have been interpreted as steeply dipping conductive structures associated with conductive basement host rocks.  Direct Current (DC) resistivity surveys were able to image the conductivity structure of the earth below Grid BII_2009-1 to a depth of approximately 165 metres, where a low resistivity “chimney” was detected co-incident with convergent structural lineaments in N70˚ E, near E-W and NW-SE orientations.

On the R-Seven project, Moving Loop Array Time Domain Electromagnetic (TDEM) surveys were successful in detecting multiple conductors in grid areas ML-1 and ML-2. As a follow-up to the high priority conductive targets, DC resistivity surveys were performed over a portion of the ML-2 grid area where a prominent resistivity anomaly was also located in association with two of the conductors.  It has been interpreted that the resistivity anomaly in the lower sandstone rocks may represent the effects of hydrothermal alteration processes often associated with fault zones and unconformity-type uranium deposits.

Follow-up drilling is recommended on the Bishop II, Meanwell and R-Seven projects to test the high-potential targets identified in the 2010 geophysical exploration programs.


Three New Uranium Targets in Argentina with Airborne Survey

Posted by on Tuesday, 5 October, 2010

Blue Sky Uranium Corp. announces it has completed a 22,214 line km regional airborne radiometric and magnetic survey in the prospective Rio Negro basin, one of the largest known private geophysical surveys ever completed in Argentina. Three very large new uranium channel anomalies were identified by the airborne survey and Blue Sky has applied for 8 licenses, (71,765 hectares) to cover these new targets. The new uranium targets include:

-Paso Cordoba: 15 km long by 1 km wide uranium channel airborne anomaly.

-Evelina: 11 km long by 2 km wide uranium channel airborne anomaly.

-Norma: 7 km long by 1 km wide uranium channel airborne anomaly.

Blue Sky’s objective in the Province of Rio Negro is to evaluate the regional potential to host additional new uranium deposits and capitalize on the Company’s first mover advantage. Management is very excited by the discovery of these new large uranium targets and is currently working to expedite granting of the concessions in order to commence detailed ground exploration and evaluation of these new targets concurrent with the ongoing exploration at the Company’s ANIT project. These new discoveries highlight the regional potential within the previously unexplored San Jorge basin in Rio Negro province.

For comparison purposes, when airborne data over the Company’s previously-discovered ANIT and Santa Barbara zones is processed using the same parameters, ANIT forms a 16 km long by 1.5 km wide anomaly and Santa Barbara consists of three 1km wide zones with combined strike length of 20km. Maps of these radiometric anomalies are available to view on Blue Sky’s web site (www.blueskyuranium.com).

Rio Negro Regional Airborne Geophysics

In April of this year Blue Sky was granted a special airborne geophysics license covering 2.265 million hectares which included all of the prospective areas for Uranium in the San Jorge sedimentary basin of Rio Negro Province, Argentina. The license allowed Blue Sky to fly high resolution airborne radiometric and magnetic surveys and Blue Sky had the exclusive rights to stake new exploration licenses on the targets identified in the survey. The contractors who completed the 22,214 line km airborne survey were global specialists APG Geophysics who used a fixed wing aircraft loaded with 3 large crystal detection packs to search for ANIT-style uranium mineralization over almost all the prospective sedimentary basin within Rio Negro. At the same time as Blue Sky flew infill flight lines over Blue Sky’s ANIT and Santa Barbara targets to provide back ground data for comparison purposes and to develop a validation process for analyzing and prioritizing new targets.


Kirrin Resources is waiting for airborne EM results

Posted by on Wednesday, 21 April, 2010

At the end of March Kirrin Resources Inc. announced that it has appointed Fugro Airborne Surveys Corp. of Ottawa to complete a 1,076 line-kilometre magnetic-electromagnetic (EM) airborne survey of its recently acquired Key Lake Southwest uranium property. The Key Lake SW property is located on the southeastern margin of the Athabasca Basin, about 40 km south-west of Cameco’s Key Lake uranium mill, in northern Saskatchewan, Canada.

The airborne survey will utilise Fugro’s fixed-wing Tempest(r) Digital Time Domain Electromagnetic (DTDEM) system which provides maximum quantitative discrimination of relatively near surface (upper 200 to 300 m) conductivity variations. Airborne magnetic surveys map the variation in magnetic susceptibility, which predominantly results from changes in the percentage of magnetite and some other magnetic minerals in the bedrock. The magnetic variations thus allow the mapping of differing lithologies, faults, potential alteration zones, etc. DTDEM surveys map the three-dimensional variation in conductivity that is caused by one or more of mineralogy (e.g., conductive minerals such as graphite or sulphides), intensity of alteration, water content or changes in salinity. The correlation of the magnetic responses with the EM conductive trends enables the indirect geological mapping of bedrock under overburden and possible Athabasca Basin sandstone outliers. As well, the airborne geophysical data can identify anomalies and potential geological targets that may be spatially associated with uranium deposits or alteration zones near such deposits.

Fugro will commence the survey forthwith and Kirrin anticipates receiving data within four weeks and a full analysis and interpretation about another four weeks thereafter.

The eastern margin of the Athabasca Basin is home to the most productive uranium mines in the world with roughly 25% of the world’s uranium production coming from this area. Kirrin‘s target at Key Lake SW is basement-hosted unconformity-type uranium deposits, similar to Cameco’s basement-hosted Millennium Deposit, located 65 km to the northeast.