I use a rough rule of thumb that they get paid ~90% of LME price by the smelter for the concentrate. May not be the right logic but it lands you in the ballpark.
As for cost - capex is going to zero or close enough and grade is going to 2% or close enough (north or 5% CuEq).. with that (and tax losses) you have yourself a cash gusher. And the announcement yesterday says you have a multi decade cash gusher.. yet trading like it’s out of business in 2 years time. The easiest of holds.
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