187
Thousand Short Tons
Figure 2. U.S. Production of Refined Copper from Primary
and Secondary Source Materials, and Production from Old
Scrap, I9IO-I96O.
Source: McMahon, Copper, A Materials Survey, p. 189, Figure
36; Production from Old Scrap adopted from Minerals Yearbook,
19^5. p. 122, Minerals Yearbook, 1965, p. 356*