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Abstract
Copper, lead, zinc, and iron are the major mineral resources of Bulgaria. Bornite, as well as tetrahedrite, chalcopyrite, pyrite, and colomorphic sphalerite, occur in Triassic dolomitic limestones of the Plakalnica deposit. Porphyry copper deposits occur in Laramide quartz monzonite, granodiorite, and quartz diorite intrusions at Miediet. Other areas of copper mineralization are associated with relatively young volcanic activity and extensive hydrothermal alteration. The zinc and lead deposits are Bulgaria's principal mineral wealth. These occur in the Siedmoichislenie deposit as individually zoned minerals in Triassic dolomitic limestones and as metasomatic replacements probably related to Oligocene rhyolites in the Hercynian-faulted Rhodope massif. Seventy percent of the iron of the Kremikovtsi deposits resulted from the oxidation of siderite to limonite in deformed Triassic sediments. --G. E. Denegar.
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