Roan Copper Production7 Nov 2024 20:58
I was having another read of the RNS and was trying to make sense of these production estimates:
"Initial copper recovery from feed is targeted at 55% which equates to an equivalent copper production rate of 6 200 copper tonnes per annum (tpa) or 7 400 tpa of copper at the increased 90 000 tpm from Roan alone"
"The integrated Roan facility targets an initial stable feed rate of 75 000 tpm of material over the first three quarters of operation, with the potential to increase to a feed rate of 90 000 tpm thereafter. An initial copper recovery of 55% copper in feed is targeted before the introduction of leaching at Roan which is expected to increase copper recoveries to in excess of 70%. This translates to an initial copper unit production from Roan, prior to leaching, of approximately 520 tpm of copper with the potential to increase to 670 tpm assuming the lower feed rate of 75 000 tpm is maintained."
It looks like they are basing the calculations on a feed grade of 1.25% copper, so:
75,000 (tpm feed) x 55% (recovery) x 1.25% (feed grade) = ~520 tpm or ~6,200 tpa
90,000 (tpm feed) x 55% (recovery) x 1.25% (feed grade) = ~620 tpm or ~7,400 tpa
What's confusing me a bit is the "in process stock" which states 442,308 DMT (dry metric tonnes) at Tcu% of 0.8 %. At what stage is this material and how does the 0.8% relate to the used average feed grade of 1.25% ? Any ideas?