Great Western Exploration intersects broad visible copper zones at Kazakhstan project
July 17. Proactive Investors Australia
By Bevis Yeo
Great Western Exploration (ASX: GTE) has intersected broad zones of visible copper mineralisation from reverse circulation drilling at the Hadzhikongan prospect of its Spasskaya Copper Project in central Kazakhstan.
This is in line with historical drilling carried out in the early 1980s during the Soviet era, which had also intersected wide zones of copper mineralisation before the Soviets withdrew from Kazakhstan.
Spasskaya is located 150km southeast of Kazakhstan’s capital Astana and is highly prospective for copper, gold, silver, zinc, lead, tungsten and bismuth.
It covers 12,500 square kilometresand is considered a high priority project by the Kazakhstan Government.
Khazakmys, a top ten copper producer, operates two major copper mines in the region (Nurkazgan and Abyz) with a combined resource of 1.35 billion tonnes at 0.5% copper, 0.16 grams per tonne gold and 1.7g/t silver for more than 6.5 million tonnes of contained copper
NITON handheld XRF analysis confirms that there are at least three mineralised zones that contain copper mineralisation intersected in the drilling.
The first batch of 458 samples obtained from the 13 reverse circulation holes totalling 2,500 metres was dispatched to ALS Laboratories on 14 July for analysis and a second batch will be dispatched next week.
The drilling was designed to confirm both the accuracy of the historic Soviet drilling and the geological dip and strike of the outcropping mineralisation.
Great Western said the results are in line with what was predicted from the historical data.
The drilling also delineated three mineralised zones that extend vertically from surface to at least 200 metres depth.
Trenching of the main zone at surface had returned NITON handheld XRF results of 42 metres at 3.4% copper.
The drilling also intersected felsic porphyry at depth not indicated in the historical Soviet data.
Copper-rich skarn mineralisation similar to what is observed at Hadzhikongan can form adjacent to porphyry hosted deposits.
This porphyry often contains stockwork veining, brittle fracturing and brecciation, and intense hydrothermal alteration which can produce large-tonnage low-grade copper mineralisation.
Diamond drilling will commence at Hadzhikongan next month to test the depth extensions and the relationship with the porphyry.
Downhole geophysical techniques will be applied to the drilling to determine further targets.
Additional reverse circulation drilling will also be completed to close off the near surface mineralisation along strike and to calculate an initial JORC inferred resource.
Great Western is also planning to start maiden drilling at the Altynobe Prospect about 5 kilometres south of Hadzhikongan.
Altynobe is located in a similar geological setting that features abundant copper oxide mineralisation at surface trending along an east-west contact zone for up to 2.5 kilometres that has been exposed in trenching and small scale open pit mining.
Historic drilling supports patches of high grade copper mineralisation along this east-west contact structure which the company will verify in the upcoming drill program.
The company has a further 5 prospects where it has confirmed significant high grade outcropping mineralisation that requires further drill testing as well as over a further 100 known copper occurrences that were reported by the Soviets for further follow-up.
Spasskaya is centred on the major regional mining city of Karaganda that has excellent supporting infrastructure including grid power and rail. Also the city has existing copper and iron refineries and supports the adjacent coalfields that contain significant untapped coal seam gas resources.
Great Western Exploration (ASX: GTE) is focused on exploration in Australia and Kazakhstan in copper and gold projects.