Anthraxolite as scattered grains, irregular veinlets, fracture fillings, and concentrations along stylolitic surfaces in the Middle Devonian wallrock of the Ruby Creek copper deposit in the Cosmos Hills, Alaska, is derived from tiny particles of indigenous organic matter excluded from grains of dolomite during recrystallization. On a moisture-and-ash-free basis the anthraxolite contains (percent) 0.9 hydrogen, 94.5 carbon, and 0.6 sulfur. Moisture-free anthraxolite contains 4.4 percent ash and is not radioactive.

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