In execution of Renaissance Uranium's approved PACE 2020 Discovery Drilling 2012 project designated DPY7-11, which was partly subsidised by DMITRE to assist in company high-risk high-reward mineral exploration within South Australia, 2 exploratory...
In execution of Renaissance Uranium's approved PACE 2020 Discovery Drilling 2012 project designated DPY7-11, which was partly subsidised by DMITRE to assist in company high-risk high-reward mineral exploration within South Australia, 2 exploratory RC drillholes with a total penetration of 520 m were put in during early June 2013 to test the Mesoproterozoic volcanic-hosted uranium mineralisation potential which might be associated with the Tanner Dam intrusive complex, a late-stage, mid-level Hiltaba Suite granite mass that has been intruded into the base of the massive upper Gawler Range Volcanics (GRV) felsic lava pile. This igneous rock type spatial relationship has similarities with the geological setting of igneous host rocks in the Streltsovska district, which is Russia’s foremost uranium producer and the second largest magmatic uranium system known (after Olympic Dam), with past and in situ reserves in excess of 500 Mlb U3O8. Vertical hole 13RTDRC01 drilled on EL 4814 by Renaissance was designed to test an intense magnetic low anomaly observed to lie within the core of the Tanner Dam intrusive complex, where the basement is cross-cut by prominent NW-trending structures and there is surface outcrop of fluorite-rich breccia veins. Examination of residual gravity data suggested that the proposed drillsite may lie peripheral to apophyses of granite/rhyolite intruded high into the basal strata of the Yardea Dacite. The target geophysical anomaly was interpreted as possibly representing a zone of intense magnetite destruction/demagnetisation resulting from intense hydrothermal alteration, a scenario which could have given rise to the leaching and recycling of uranium from GRV and/or Hiltaba granite source rocks into spatially coincident structural and dilational traps (veins, stockworks and breccias). A critical aim of the hole was to intersect the intrusive contact between the Tanner Dam granite body and the upper GRV felsic lava flows (± lower GRV rocks). Results obtained from assaying 5 m composite drill cuttings samples revealed that 13RTDRC01 had intersected two zones of low order anomalous uranium hosted in rhyodacite: 40 m @ 22 ppm U, 476 ppm Pb and 1 ppm Ag from 35-75 m depth, and 5 m @ 47 ppm U, 60 ppm Mo and 1.34 ppm Ag from the depth interval 190-195 m. The significance of these intercepts was not rated highly, but was regarded as encouraging for further work. North-eastwards-inclined hole 13RSDRC01 completed on EL 5104 tested the NW margin of the granite intrusive complex, at a place where a discrete magnetic body had been recognised lying along the granite - dacite stratigraphic contact. The hole encountered a variably magnetic sequence of dacite, the best assay result obtained being 5 m @ 8 ppm U from the depth interval 160–165 m. No further work on this target is considered necessary. Neither drillhole reached the base of the upper GRV felsic lava units.
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