Sep 26 2013
NexGen Energy Ltd. ("NexGen" or the "Company") is pleased to announce, as at September 22, 2013, it has completed 8 diamond drill holes using two drill rigs at the Rook 1 project, totaling 1,957m of the planned 3,000m drill program.
The drilling covers an area approximately 700m along interpreted extensions of the Patterson Lake South (PLS) 3B conductor and a parallel conductor approximately 800m to the east (Fig 1).
The primary targets comprise zones of interpreted coincident resistivity, EM, gravity, and magnetic anomalism in the basement. Some of these zones are interpreted to be continuations of the geophysical features found at the Fission / Alpha Patterson Lake South project. The current published boundaries of the PLS mineralization, where now 5 separate high-grade uranium discoveries have been made, cover a strike length of approximately 1.2km; its northern known limit is 2.1km south-westerly along strike from Rook 1 (Fig 1).
Highlights
- All holes intersected varying types of structural zones in basement lithologies, ranging from small fractures through to wide heavily brecciated material; maximum downhole width was 38.3m in hole RK-13-03.
- Holes RK-13-02, -03, -04, -05, -06, and -07 intersected graphitic basement lithologies.
- All holes intersected varying widths of haematisation, chloritisation, argillisation, and calc-silicate alteration in the basement lithologies, generally associated with structural zones.
- Several holes intersected zones of elevated radiometric readings using a hand scintillometer, the most notable reading being to a maximum of 1000 counts per second (cps) over 0.5m in hole -06 from 152.6m downhole depth.
- Shallow basement rock was encountered in the 8 holes, ranging from 48.7m to 82.6m downhole.
- The current 3000m drill program will continue into early October subject to weather conditions. Planning is already underway for a winter campaign testing the immediate area within this zone of drilling.
Leigh Curyer, CEO of NexGen states, "Our technical team has done a terrific job in only the first 8 holes to be drilled in this zone of Rook I. The signatures seen in the core from these holes confirm the prospectivity of Rook I and provide a high level of confidence around the geophysical surveys previously conducted. To be in this position, this early in the exploration program is very exciting for us and our shareholders."
Basement lithologies intersected comprise a variety of quartz-feldspar-biotite (± garnet ± cordierite) microgneiss and gneiss, with local graphitic units. Local alteration has been noted, primarily being haematisation, chloritisation, calc-silicate alteration, and local argillisation, especially associated with fracture zones. A number of fault structures and breccia zones have been noted, some being haematised (eg Fig 2), and others exhibiting fluidised brecciation. The structural disruptions vary in intersected length from 0.5m-38.3m.
In addition, small zones of elevated radiometric readings using a hand scintillometer have been found in several holes, the most notable being to a maximum of 1000 counts per second (cps) over 0.5m in hole 6 from 152.6m downhole depth.
Samples have been taken routinely for geochemistry and alteration analysis. Final results are expected within two months. Magnetic susceptibility measurements have been taken on all basement core, and other samples have been taken for gravity measurements.
Note that radiometric readings reported in this news release are measured in counts per second (cps) using a handheld Exploranium GR110G total count gamma radiation scintillometer. Total count scintillometer readings may not be directly related to actual uranium or other radioactive elements and minerals present in the rock interval measured. It is used purely as an indication of the presence of radioactive material. General background readings are in the range of 40-100cps elsewhere. The grade of the actual material must be verified by chemical or other definitive analytical techniques. The amount of radioactivity is usually highly variable in uranium mineralised zones. True thicknesses are yet to be determined.
Qualified Person
Andrew Browne, FAusIMM(CP), NexGen's Vice President, Exploration & Development, is a "qualified person" for the purposes of National Instrument 43-101 - Standards of Disclosure for Mineral Projects, and has reviewed and approved the contents of this news release.