Abstract
There are over a hundred deposits and occurrences of molybdenum mineralization in Bulgaria. With respect to genesis they belong to the magmatic (?), pegmatitic, greisen, hydrothermal and iron-sulphide endogenic classes of Smirnov Geology of Ore Deposits Nedra, Moscow, 1982. Using composition, age and morphologic criteria the molybdenum deposits are assigned to two kinds of metal-formations: molybdenite and molybdenum-bearing. To the first type are assigned the molybdenite (± sphalerite) greisens and pseudogreisens (quartz-sericite-fluorite metasomatites), the molybdenum-tungsten-bearing (scheelite, molybdenite, pyrite) quartz-feldspar metasomatites, quartz-molybdenite and molybdenite. The second type comprises the porphyry copper, copper-gold-polymetallic, polymetallic-silver sulphoarsenidic and fluorite-barite-polymetallic. Only as a mineralogic occurrence, molybdenite has been established in the lead-zinc, fluorite and iron-sulphide deposits and also as an accessory mineral in a number of granitoid massives. Most important for the mining industry are the deposits of porphyry copper.
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