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Projects |
High Grade Targets - Central Bore and SurroundingsCentral Bore The Central Bore Prospect is a new discovery (2009). It is located 3.7 kilometres east of the Attila gold deposit, the southernmost portion of the Yamarna Gold Deposit. RAB drilling was undertaken during the first half of 2009, and the high-grade results announced to the market on 16 July 2009. During the second half of 2009, 39 reverse circulation holes (RC), totalling 3,905 metres, were drilled over twelve drill fences to test a strike length of over 500 metres, to a maximum hole depth of 210 metres. This discovery has highlighted that the Yamarna greenstone belt does contain significant high-grade deposits. High grade gold intercepts in 2009 included:
In the first half of 2010 Eleckra completed 48 holes for 8,100 metres of reverse circulation drilling at its Central Bore project area, where the high-grade intercepts were confirmed over an 800m strike length, and down to a depth of 300m. The high grade intercepts include:
The maiden resource for Central Bore is anticipated later in 2010, together with gravity separation testwork and high-level mining economics. Click here for the summary of the RC drill intercepts > 1.0 g/t Au at Central Bore (48Kb PDF file). The mineralisation commences from surface and it is hosted within an andesitic porphyry. Gold mineralisation is associated with up to 0.2% molybdenum and up to 20 g/t silver. Free gold has been panned off from many mineralised drill samples. Gold mineralisation is still open along strike and open at depth. This will be tested in the upcoming RC and diamond drilling program. Metallurgical Testwork: Eleckra has conducted metallurgical testwork using 1-kilogram 24-hour bottle roll Accelerated Cyanide Leach (Leach Well) on 42 selective 1-metre drill intercepts from 12 RC holes at Central Bore. The Leach Well results show extremely good gold recoveries averaging 96% in all weathering zones after grinding to CIL size ranges of 75 microns.
Two other prospects have been identified near Central Bore: Byzantium Prospect During the December 2009 quarter Eleckra completed a closed-spaced soil survey program at Byzantium prospect that is located only 500 metres west of the recently discovered Central Bore high grade gold deposit. The soil geochemistry program has defined a 1 kilometre-long gold anomaly that contains elevated gold values up to 0.14 g/t Au. The soil survey was a follow up to an earlier wide-spaced soil survey that had identified a weak but distinctive 0.5 kilometre-long gold anomaly at the Central Bore prospect and stronger 2 kilometre-long gold anomaly at the Byzantium prospect. The Central Bore soil anomaly was followed up in June 2009 by RAB drilling and in September 2009 by RC drilling leading to the high grade gold discovery which was announced to the ASX on 7 and 14 October and 17 November 2009. The multi-element soil assay results indicate a 1 kilometre-long gold anomaly that displays a north-northwesterly orientation. The gold is associated with elevated molybdenum values indicating the style of mineralisation is similar to the newly discovered Central Bore deposit. Elevated molybdenum up to 0.2% was associated with high grade gold RC intercepts at Central Bore. The size and strength of the gold anomaly at Byzantium is very encouraging and Eleckra intends to carry out its maiden RC drilling program on the prospect in early 2010. The results from the current soil survey also identified a strong 1 km-long lead-zinc-copper-arsenic (up to 0.14% Pb) anomaly with sporadic but elevated gold near the western boundary of the survey area (Refer to Figure 10). The base metal anomaly coincides with an outcropping sulphide-rich alteration zone and appears to be hosted by felsic volcanic rocks. It is located approximately 200 metres west of gold anomaly.
Hann Prospect Close-spaced geochemical soil survey carried out in December 2009 at the Hann prospect defined a zone that contains elevated gold values, only 1.1 kilometres east of the Attila gold deposit and 2.4 kilometres west of the Central Bore gold discovery in a parallel magnetic structure. The original assays and repeat results indicate presence of coarse gold in soil samples. The soil survey at the Hann prospect was undertaken as a follow up to earlier wide-spaced traverses of shallow auger and RAB drill-holes. In June 2009, Eleckra drilled 26 shallow RAB holes on the prospect that returned encouraging gold results. However, the drilling program was terminated as the RAB drilling could not penetrate the hard, silicified felsic volcanic schist present at the prospect. Eleckra decided to determine the extent of, and to better define, the anomaly by a close-spaced geochemical soil survey (1 – 5mm lag). Approximately 950 soil samples were collected on 20mE x 40mN grid over a total strike length of 2.8 kilometres. The southern end of the sampled area is predominantly over Archaean bedrock and calcareous soils (residual), while the northern part is over saprolite erosional plains. Samples were collected mainly over the area with sub-outcropping and residual soil regolith. Generally, sampling was avoided over the major drainage basins and channels as soil sampling would not be effective. Samples were assayed by Genalysis using Aqua Regia for Au, Ag, As, Cr, Cu, Fe, Mo, Ni, Pb, Te, Zn. Gold and other elements were levelled for the effects of regolith. The unlevelled gold image shows a very strong 800 metre-long anomaly over the area with Archaean bedrock in the south-eastern grid, with grades up to 2.1 g/t Au in repeat assay and up to 1.05 g/t Au in original assay. A weaker trend is visible in the north-western grid over the area with the saprolite erosional plains, which mask the response. The levelled gold image clearly shows three parallel trends that continue from southeast to northwest on the saprolite. Anomalies relative to background are of the same order of magnitude over both grids. The levelled arsenic image also shows a strong anomaly in the southern grid that is associated with the eastern gold trend. In the northern part of the grid from 6,885,360N onwards, arsenic shows unexplained parallel north-south trends, which will be further checked. Eleckra intends to carry out its maiden RC drilling program at the Hann prospect in early 2010. A follow up soil survey will be undertaken in mid-February to extend the grid further to the southeast along the trend.
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