Underground mines are places for extraction of three types of copper and nickel sulfide ores: rich, copper and incorporated--those three ones differ in mimeralogic and chemical contents. Experimental evaluation of carcinogenic effects obtained during intratracheal administration of copper and incorporated ores indicates the certain carcinogenic activity of the dust with 0.49-1.14% nickel and 1.9-5.8% copper content--therefore a unified MAC for all the stated dust types could be suggested.
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