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Thamrin Sihite, director general of minerals and coal at the Indonesian energy ministry, said workers were in the underground training room when the roof collapsed, caving in most of the room.
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The company is engaged in exploration for, and mining and sale of coal, copper and other minerals.
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Exxon Mobil is engaged in exploration for, and mining and sale of coal, copper and other minerals.
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His publicly-traded company, African Rainbow Minerals (ARM) has interests in platinum, nickel, chrome, iron, manganese, coal, copper and gold.
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There are many types of sulfide minerals, but pyrite and marcasite, the two structural forms of FeS2 that are especially common in coal regions, are the major acid-producers.
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