Employment, mine and plant, number 11,700 12,000 11,000 11, 4 00 12,000 Net import reliance. 4. as a percentage of apparent consumption 33 37 38 4 4 41 ... Bingham Canyon Mine in Utah, where ore grades and recovery rates were higher than those in 2021 following the transition to mining a new area of the open pit. Copper production also rose ...