Drilling has identified extensive cobalt and manganese mineralisation
Ketchowla Cobalt Manganese Project
The Ketchowla Cobalt Manganese Project, is located north of Burra, South Australia, within the Nuccaleena Formation. Ketchowla is a cobalt and manganese project which includes the K1 Prospect (centred around the historic small Ketchowla Mine) and numerous outstanding exploration targets and prospects, including the K2 to K9 prospects. The standard gauge east-west Trans Australian Railway line is located 35km north of the main project area. Established electricity and water infrastructure is also within close proximity.
Early rock chip sampling reported by Archer (ASX announcement 16/11/2009) reported grades of up to:
- 0.59% cobalt (Co) and 42% manganese (Mn) at K1 (includes K1 northern and southern extensions).
- 0.50% Co and 48.1% Mn at K2.
- 0.29% Co and 46.3% Mn at K3 – K9
Shallow cobalt and manganese mineralisation was intercepted at K1 in both of two holes drilled at K1 (K1RC001 and K1RC004):
- K1RC001: 11m @ 0.11% Co and 12%Mn from 6 to 17m, including 4m @ 0.14% Co and 15.6% Mn.
- K1RC004: 4m @ 0.11%Co and 17.5%Mn from 11 to 15m.
Simple beneficiation and acid leach test work (ASX announcement 20/04/11) done by Archer showed that:
- cobalt and manganese could be easily upgraded using simple heavy media separation.
- agitated sulphuric acid leaching resulted in metal recoveries of >90% for all elements tested (Co, Cu, Ni, Zn and Mn).
Cockabidnie Cobalt Project
The tenement area abuts Archer owned farm land near Cleve, Eyre Peninsula, South Australia. Exploration efforts and drilling by other explorers was primarily focussed on the discovery of zinc and nickel deposits with no assaying for cobalt. Archer recovered sample pulps (remnant material from the assay process) and submitted available intervals for assay. Subsequent assay results received by Archer include a significant average cobalt grade of 0.2% Co (hole CBAC034) over a broad 8m downhole intercept (from 30 to 38m).