A simplified economic filter for open-pit gold- silver mining in the United States
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چکیده
This report is preliminary and has not been reviewed for conformity with United States Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
منابع مشابه
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تاریخ انتشار 2000