Note 113 — Chapter XIV · COPPER By F. W. Paine
Reading edition
This balance includes copper produced as by-product in mining of other metals in Colorado and the East, estimated at 50,000,000 pounds, and custom shipments from 1,000 small operations, chiefly to smelters controlled by groups 1, 2, 3, 4 and 6, estimated at 84,458,614 pounds.