TY  - BOOK
T1  - A simplified economic filter for open-pit gold-silver mining in the United States /
DA  - 1998.
CY  - [Menlo Park, CA] :
AU  - Singer, D. A.
AU  - Menzie W. David.
AU  - Long, Keith R.
VL  - 98-207
CN  - I 19.76:
PB  - U.S. Geological Survey,
PP  - [Menlo Park, CA] :
PY  - 1998.
N1  - Cover title.
N1  - "U.S. Department of the Interior, U.S. Geological Survey"
ID  - 216816
KW  - Gold ores
KW  - Silver ores
KW  - Gold mines and mining
KW  - Silver mines and mining
TI  - A simplified economic filter for open-pit gold-silver mining in the United States /
ER  -