RE: c u s n6 Jun 2022 16:25
Xpondsimms
The 2017 PEA may help
It states
"The underground mine production has been scheduled at a steady-state rate of 1,000 tpd on a 7
day work schedule but could be scheduled at 1,200 tpd on a 6 day schedule."
On page 168 it states;-
"Average process recoveries of 88% for Sn, 85% for Cu, and 70% for Zn. "
The historical recovery when done by Wheal Jane in the last few years ( 1988 on) had improved on the recovery rate when done at SC because WJ used a flotation circuit to boost recovery from fines as well as an HMS circuit. I think the PEA for SC envisages that too.
This may help:-
https://www.sciencedirect.com/science/article/abs/pii/089268759390056S
COSTS from table 22.2 of the 2017 PEA (for the third year of production)
This envisages 35o,ooo of ore produced, at a head grade of 1.58%, a process recovery rate of 88%, Recovered lb's SnEq of 10.73 million lbs.
Mining $ / tonne 66.72
Processing $/tonne 23.18
G&A & Closure $/tonne processed 9.78
TOTAL COST $/tonne processed 99.69
ALL INCLUSIVE COST (C2) $/tonne 153.45
Result US$ 40.4m of pre tax cash earnings in year 3 when production levels are near normal.
The PEA (available on sedar) and therefore the above figures - needs to be updated for a much increased tin price, an increase in resources due to exploration work and cost inflation. But the above hopefully gives you some idea of the potential from SC alone.