An area consisting of three separate sub-blocks located ~20 to 35 km north-east of Olary and ~20 km east of Cutana is being explored for possible economic gold as basement shear and vein hosted style deposits, as well as for possible extensions of...
An area consisting of three separate sub-blocks located ~20 to 35 km north-east of Olary and ~20 km east of Cutana is being explored for possible economic gold as basement shear and vein hosted style deposits, as well as for possible extensions of the uranium mineralised felsic basement of Radium Hill and Crocker Well, and for possible younger Mt Gee - style breccia/shear hosted uranium deposits that may be genetically associated with Palaeozoic Delamerian and Alice Springs orogenic fault reactivations. The start of exploration on the subject tenement was not possible during Year 1 because the company was awaiting the release by Geoscience Australia of its processed 2010 airborne EM survey data, which was delayed until March 2011, and because Renaissance had to abide by ASX rules requiring corporate inactivity during a share IPO period. During licence Year 2, field work began that involved: - regional 200 m x 200 m (3049 samples) and subsequent infill (339 samples) soil geochemical sampling during April 2011 over the majority of EL 4394, which defined high priority anomalous gold RC drill targets, with some assay results from another 1070 samples collected on the southern licence sub-block still awaited that could possibly provide further future drill targets; - 22.2 line km of ground magnetic surveying during August 2011 of four features of interest identified from public domain aeromagnetic survey data, which provided higher resolution of magnetic anomalies and enabled correlations with geochemical anomalies previously defined; - the conduct of an ATLA Heritage clearance survey, to provide approvals to commence RC drilling over 6 priority geochemical targets; - commencement of this drilling program during November-December 2011, with 33 inclined RC holes completed for a total penetration of 2122 m over four of the targets. During licence Year 3, field work involved: - collection of 2990 soil samples on either 100 m x 100 m or 50 m x 100 m grids for multi-element assaying to confirm anomalies detected by previous regional soil sampling; - the drilling of 36 inclined RC holes for 3887 m at targets defined by soil geochemistry, previous drilling and desktop analysis of geophysical targets. The infill soil sampling undertaken at the Pinery prospect confirmed a major anomalous gold zone, with soil gold levels of >5 ppb Au present over an area of ~ 2 km x 500 m. The highest gold value was 53 ppb Au, and multiple clusters of over 20 ppb Au occurred throughout the anomalous zone. Infill soil sampling at the Tepco prospect confirmed the original elevated gold content over an anomalous area of 250 m x 150 m, with a peak gold value of 75 ppb Au. The apparent prospectivity of this gold anomaly was enhanced due to its close coincidence with a local “bulls-eye” aeromagnetic anomaly. RC drilling undertaken at the Pinery prospect intersected gold in both near-surface oxide zones and deeper primary zones, with drill cuttings assay values defining intercepts of up to 6 m @ 0.73 g/t Au in the oxide zone, and 2 m @ 0.89 g/t Au in the primary zone, existing within a broader zone of sulphide and epidote alteration in garnetiferous gneiss. At the Tepco prospect, located ~7 km to the south-west of Pinery, Renaissance intersected gold within an oxide zone having values of up to 8 m @ 0.32 g/t Au. Because the drill traverse chosen here was designed to test both the soil gold target and the source of a local aeromagnetic anomaly, it lay ~60 m to the south-east of the geochemical peak. Weakly magnetic gneiss was intersected in the southernmost hole on the traverse, but no primary gold mineralisation is associated with the magnetite. However, the drilling also revealed that the Tepco area has up to 20 m of transported clay-rich cover which would be expected to mask the soil geochemical response. Under these circumstances, Renaissance regarded the level of soil anomalism at Tepco as potentially much more significant, warranting further assessment. At the Aroona prospect, drilling intersected approximately 30 m of transported clay-rich cover before entering a thick sequence of oxidised amphibolite clays passing into fresh, weakly magnetic amphibolite that was concluded to be the source of the magnetic anomaly of interest. Drillhole 12RCTRC63 was abandoned in the thick cover sequence due to sticking drill string; downhole samples from it that were sent for assaying gave no results of note. The initial 4-hole test of an extensive gold-copper and magnetic anomaly at Heinrich's prospect, located within the northern sub-block of EL 4394, was performed during November-December 2012. The most significant result obtained from this drilling was 18 m @ 0.23 ppm Au in hole 12RCTRC66, from the interval 4-22 m within oxidised Proterozoic gneiss. This result is similar in tenor to the assays returned from the company's earlier drillhole 11RCTRC09, located approximately 600 m to the north-east, and therefore was thought to be significant, with scope for possible increased grade in the intervening space. It was decided to conduct more detailed soil geochemical sampling there to try to define the trend of the mineralisation. During licence Years 4, 5 and 6, no field work was done. Renaissance reviewed its 2012 drilling data along with its earlier geophysical, geological and surface geochemical data. During licence Year 7, new licence owner Astra Resources began a search for spodumene and other felsic pegmatite-hosted lithium minerals, besides continuing to explore for near surface oxide-gold deposits similar in style to the occurrence at the nearby White Dam gold mine. In April 2016, 5 rock chip samples were collected from selected pegmatite outcrops and were submitted for laboratory multi-element assaying. No anomalous lithium contents were detected. However, Astra's field reconnaissance found that pegmatite bodies occur more extensively than shown on regional geological maps, so further sampling of them was warranted. During licence Year 8, Astra did no field work, but reviewed historic drilling results and soil geochemical assay data to try to define cobalt - prospective targets. Two targets were identified at Bulloo Creek and Shorts Dam. During licence Year 9, at Bulloo Creek and Shorts Dam, Astra performed soil and rock chip geochemical sampling (total 205 and 118 samples respectively) to better define cobalt targets for drill testing. The results obtained were encouraging: at Bulloo Creek an 800 m x 400 m zone of anomalous soil was seen to coincide very closely with the peak of an aeromagnetic anomaly, while gossanous material sampled from near the sites of some cobalt-anomalous previous Esso percussion drillholes at Shorts Dam returned multiple cobalt assay values of >100 ppm Co, to a maximum of 471 ppm Co.
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