RNS - OMCO Mine Tailings6 Dec 2021 17:30
Excellent news that OMCO Mine Tailings are both higher grade and deeper than first thought after drilling 12x Auger holes at average depth 3.43m or 72% more than the 2m previously assumed. GWMO have also completed 67 fire assays over the 12 samples for an average of 5.6 per hole or one assay every 0.6m ... so very thorough giving average grade of 1.25g/t Gold. Unfortunately they did not provide any silver grades which given Historic records indicate 25g/t Gold and 30g/t Silver would have been useful to know.
Contained Gold in Tailings= 5,300oz assuming 100% recovery:
OMCO = (41kt x 1.72% x 1.25g/t ) /31.1 = 2,835 oz (tailing increase & grade Ref: RNS 6-Dec-21)
MJ = (12kt x 14/5 x 2.28g/t ) /31.1 = 2,463 oz (tailing increase & grade Ref: GWMO presentation Sept-21)
In Summary:
Revised tailings and grades gives a potential contained gold of 5,300oz @$1,750 = £7m assuming 100% recovery. Checking back to RNS @1-Apr-21 GWMO processing study indicated 50% gold recovery using gravity separation only citing cyanide leaching as relatively expensive and long lead-time. Todays RNS however indicates that cyanide leaching is being reconsidered given the large increase of tailings volumes across both MJ and OMCO spoil heaps which may now shift the economics of cyanide leaching plant and IMHO increase %gold recovery above 85% albeit with increased CAPEX.
As historic tailings have already been mined and crushed they just need to be dug out and transported to the GWMO processing facility so CAPEX for processing plant, roads & camp plus OPEX for operations to dig the stuff out & transport it.
Things are looking up considerably !
ATB APR