1974
A globe of mining photographs: helicopter, drill, mill.
The company
Bethlehem Copper Corporation was a British Columbia copper miner whose Highland Valley operations included the Huestis Mine and properties adjoining Valley Copper.
Bethlehem Copper Annual Report 1974, p. 4
That year
Bethlehem’s Highland Valley mill processed 6,346,402 dry tons of ore in 1974 and produced 57,089,384 pounds of copper.
Bethlehem Copper Annual Report 1974, p. 9