Geochemistry of Selected Coal Samples from Sumatra
0.5% (U.S. Embassy Jakarta, 2000). Most of the coal mined for export has heat values that range from 5,000 to 7,000 kcal/kg, with low ash and sulfur (United States Embassy Jakarta, 2000). Low grade coals are characterized by high moisture contents (20 to 40 %) and a low
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