The nature and use of copper reserve and resource data : a discussion of the use and limitations of copper resource data for production estimates, trends, and forecasts /

Autor Cox, Dennis P., Wright, Nancy A., Coakley, George J.
Vydáno 1981

Computer-aided estimates of concentrating-grade iron resources in the Negaunee Iron-formation, Marquette District, Michigan /

Autor Cannon, W. F., Powers, Sandra L., Wright, Nancy A.
Vydáno 1978