NATIONAL MINERALRESOURCE ASSESSMENT:
1 Estimates of discovered resources based on Singer,, 1995, World class base and precious metal deposits A quantitative analysis: Economic Geology, v. 90, p. 88104.. 2 Same as the estimates of the Total, Reserve base, World total (excluding the United States) based on Geological Survey, 1996, Mineral Commodity Summaries 1996, 195 p.. How the Assessment Was Done