Coal Resource Classification System Of The U.S.Berseau Of Mines And U.S.Geological Survey
this method of classification is in conformity with the provisions of the joint geological survey-bureau of mines resource classification agreement of november 21,1973,covering all mineral resource and will be used in future resource/reserve studies on coal conducted by agencies of the department of the interior. All resource and resorve estimates will be date.
Ketersediaan
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Pusat Sumber Daya Mineral, Batubara dan Panas Bumi - Jln. Soekarno Hatta No. 444, Bandung, Jawa Barat
PMB LU 1976-1