 | 1959 - 520 sider
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 | 1951 - 1176 sider
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 | 1975 - 346 sider
...1 mile apart, but they may be as much as 1-1/2 miles apart for beds of known continuity. Inferred- -Quantitative estimates are based largely on broad knowledge of the geologic character of the bed or region and few measurements of coalbed thickness are available. The estimates are based primarily... | |
 | 1975 - 872 sider
...apart, but they may be as much as 1-1/2 miles apart for beds of known continuity. Inferred--Quantitative estimates are based largely on broad knowledge of the geologic character of the bed or region and few measurements of coalbed thickness are available. The estimates are based primarily... | |
 | 1969 - 660 sider
...establish its grade through Inferred ore: Ore for which quantitative estimates are based largely a broad knowledge of the geologic character of the deposit and for which tl " are few, if any, samples or measurements. These estimates are based on an assumed continuity or... | |
 | 1956 - 938 sider
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 | 1965 - 478 sider
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Inferred ore is ore for which quantitative estimates are based largely on broad knowledge of the geologic character of the deposit and for which there are few. if any, samples or measurements. 
