Archer has several copper prospects at various stages of exploration.
Archer has several projects that are prospective for copper, including discoveries at Blue Hills (new discovery), North Broken Hill (new discovery), Spring Creek (old underground copper mine) and Emu Plain (copper anomaly on the Eyre Peninsula).
The Blue Hills project is located approximately 5km north of the Company's Ketchowla Cobalt project and 50km northeast of the township of Burra, SA.
At Blue Hills, Archer has identified a mineralised circular intrusive body over an area of approximately 25km2 . A systematic soil survey (> 4,500 samples tested over an area of 40km2) has identified three discrete mineralised zones: Hood, Hawkeye and Katniss. These three anomalies are situated on two large, parallel copper mineralised corridors that cross cut the geographical area The higher grade copper mineralisation appears to cross several geological formations rather than being constrained to one formation. The Hood anomaly features in one corridor whereas the Katniss and Hawkeye anomalies are in the other. These NW – SE mineralised corridors represent a large target area for future copper exploration.
North Broken Hill
The North Broken Hill Project is located approximately 20km north of Broken Hill, NSW and is prospective for both copper and cobalt. The copper is primarily associated with Sisters Style mineralisation and whilst the area has been heavily explorated for repititions of the nearby Broken Hill silver-lead-zinc orebody there has been very little systematic copper exploration in the area.
Archer has identified three discrete target areas at North Broken Hill, namely: Secret South West which has a strike length of >5km and up to 6.4% copper; Yancowinna covers an area of 4km2 with a peak grade of 15.5% copper; and Purnamoota with a strike length > 4km and grades of up to 3.5% copper. Minimal historic copper exploration work performed within the larger project area and Archer is excited by the potential of these areas to host copper mineralisation. Some of these areas have also been identified by Archer as prospective for cobalt.
Emu Plain is located near Cleve and is the site of the historic Emu Plain copper mine that was first developed in the early 1900s and last re-developed in the 1950. In 2011 Archer conducted a three hole RC drill program with results of: 37m @ 0.13% Cu and 4.2g/t Ag from 0 to 37m in EPRC11_001 (EOH), 60m @ 0.11% Cu and 1.0g/t Ag from 0 to 60m in EPRC11_002 and 10m @ 0.50% Cu, 6.9g/t Ag and 600ppm Mo from 27 to 38m in EPRC11_003. Whilst all three drill holes each intersected broad zones of highly anomalous copper mineralisation it is believed that the holes were drilled in the footwall of the main copper lode which is believed to have been at least 7m in width and grading several percent copper.The scale and intensity of alteration suggests that the drilling intersected part of a much larger alteration and mineralisation system.
The historic Spring Creek copper mine is located 30km south of the township of Wilmington, South Australia. Copper mining ceased in 1918 when the mine de-watering pump failed and the mine flooded. Copper carbonates exist on the surface above the mine and within the backs and walls of the un-worked sections of the drives. Underground face sampling on the uppermost level of the historic Spring Creek Copper Mine confirmed the presence of significant copper mineralisation peripheral to the former production stopes.· Sampling by Archer identified a ≈2% Cu halo consisting of copper carbonate (malachite and azurite) outside of the main stopes including: 2m @ 1.8% Cu across drive 1; 4m @ 3.0% Cu across drive 1a; 10m @ 1.3% Cu along drive 2 and 12m @ 1.9% Cu along drive 3a.