Drilling at Archer Exploration’s Sugarloaf graphite project in South Australia’s Eyre Peninsula has led to a significantly higher exploration target. The company says confirmation of the presence of an eastern graphite limb means the target is now in the vicinity of 40-70 million tonnes @ 10-12% carbon, a massive increase on the previous 2011 estimate of 24-27 million tonnes.
Results from the eastern limb of the anticline include 20 metres @ 7.8% carbon from 54 metres, 23 metres @ 10.6% carbon from 96 metres and 25 metres @ 6.4% carbon from 42 metres.
Sugarloaf is on Carappee Hill near Darke Peak on the Eyre Peninsula. Historical drilling at the tenement had recorded numerous intercepts of graphite but the intervals were not assayed for carbon as graphite wasn’t the focus of the previous exploration.
Archer has reviewed the historical drill logs, recognizing that graphitic intervals were recorded in almost half of the historic drill holes.
Three drill holes completed in February this year intersected widespread graphite on the eastern limb, as indicated by the historic holes drilled for gold. Archer’s previous drilling had only concentrated on the western graphite limb.
Metallurgical testing has confirmed an amorphous graphite product of 82% total graphitic carbon using conventional flotation techniques and an 85% content using an acid digest. The concentrate had 91% total organic elemental carbon, with a sample head grade of 10%.
Archer’s chairman Greg English says the company will now test several other sections of the deposit to obtain a better understanding of the average flotation performance.