Indicated resources, coal

Indicated resources, coal
  Coal for which estimates of the rank, quality, and quantity are based partly on sample analyses and measurements and partly on reasonable geologic projections. Indicated resources are computed partly from specified measurements and partly from projection of visible data for a reasonable distance on the basis of geologic evidence. The points of observation are 1/2 to 1-1/2miles apart. Indicated coal is projected to extend as a 1/2-mile-widebelt that lies more than 1/4 mile from the outcrop, points of observation, or measurement.
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary

Energy terms . 2014.

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