Assarel Group

Porphyry copper Group in Pazardzhik, Bulgaria

Names and other identifiers

Tract name Transylvania-Balkan Mountains (150pCu6001)
Group name Assarel Group
Included sites Assarel and Orlovo Gnezdo deposits
Site status Group

Geographic location

Country Bulgaria
State or province Pazardzhik
Geographic location 24.132, 42.542
Geologic map unit 24.132, 42.542
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 89.9
Age determination method U-Pb zircon
Age range 89.9 ±0.26 to 89.13 ±0.28 Ma
Age reference Peytcheva and others (2007)
Minerals adularia, aikinite, albite, alunite, anhydrite/gypsum, antlerite, arsenopyrite, arsenosulvanite, azurite, barite, biotite, bornite, bravoite, brochantite, calaverite [AuTe2], carbonate, chalcanthite, chalcocite, chalcopyrite, chlorite, colusite, copper, cuprite, diaspore, enargite, epidote, fluorite, galena, goethite, gold, goldfieldite [Cu12(Te,Sb,As)4S13], hematite, hessite, kaolinite/dickite, mackinawite, magnetite, marcasite, melanterite, molybdenite, muscovite/sericite, prehnite, pyrite
Associated rocks granodiorite porphyry, quartz diorite porphyry, syenodiorite porphyry, conglomerate, dacite, limestone, sandstone, andesite, andesite pyroclastics, gneiss, granite, hornfels
Tectonic setting continental margin
Stratigraphic age Late Cretaceous

Commodity and development information

Development status Producer
Major commodities Cu, Au
Trace commodities Pt, Pd
Tonnage (Mt) 390Mt
Cu grade (%) 0.43%
Au grade (g/t) 0.19g/t
Contained copper 1,700,000t
Gold-Moly ratio -9999

Reference information

Comments This group record includes data for the Assarel and Orlovo Gnezdo deposits; as such, the location information has been generalized, and the total weighted average resource data represent the two deposits in the group.
Study area name Europe
References Angelkov and Parvanov (1980); Bogdanov (1982); Bogdanov (1983); Eliopoulos and others (1995); Herrington and others (2003); Petrunov and others (1990); Peytcheva and others (2007); Tarkian and Stribrny (1999); von Quadt, Peytcheva and others (2005); Kamenov and others (2007); Singer and others (2008); Assarel-Medet JSC (2011); Popov and others (1996); Zartova and others (2004)
Site reference Sutphin and others (2013)
Angelkov, K., and Parvanov, B., 1980, The Assarel porphyry copper deposit, Bulgaria, in Jankovi?, S., and Sillitoe, R.H., eds., European copper deposits: Belgrade, Society for Geology Applied to Mineral Deposits (SGA), UNESCO-IGCP International Symposium, Bor, Yugoslavia, September 18–22, 1979 [Proceedings], p. 59–62.
Bogdanov, B.D., 1982, Bulgaria, in Dunning, F.W., Mykura, W., and Slater, D., eds., Mineral deposits of Europe, Volume 2—Southeast Europe: London, The Institution of Mining and Metallurgy and the Mineralogical Society, p. 215–232.
Bogdanov, B.D., 1983, Porphyry copper deposits of Bulgaria: International Geology Review, v. 25, no. 2, p. 178–188. (Also available at
Eliopoulos, D.G., Economou-Eliopoulos, M., Strashimirov, S., Kovachev, V., and Zhelyskova-Panayotova, M., 1995, Gold, platinum and palladium content in Cu-deposits from Bulgaria—A study in progress in Congress of the Carpatho-Balkan Geological Association, 15th, Athens, Greece, September 17–20, 1995, Proceedings: Athens, Geological Society of Greece Special Publication 4, p. 712–716.
Herrington, R.J., First, D.M., and Kozelj, D., 2003, Copper porphyry deposits in Hungary, Serbia, Macedonia, Romania and Bulgaria, in Kelly, J.G., and others, eds., Europe’s major base metal deposits: Irish Association for Economic Geology (IAEG) Conference, Dublin, May 2000, p. 303–321.
Petrunov, R., Dragov, P., and Neykov, H., 1990, Polyelemental (with As, Sn, V, Bi, Ag, Te, Ge, Se, etc.) mineralizations in the Asarel porphyry copper deposit (Bulgaria): Geologica Balcanica, v. 20, no. 4, p.48.
Peytcheva, I., von Quadt, Heinrich, C.A., Nedialkov, R., Neubauer, F., A., and Moritz, R., 2007, Medet and Assarel Cu-porphyry deposits in Central Srednogorie SE Europe—Were they a common magmatic and hydrothermal system?, in Andrew, C.J., and Borg, G., eds., Mineral exploration and research—Digging deeper: Society for Geology Applied to Mineral Deposits (SGA) Biennial Meeting, 9th, Dublin, Ireland, August 20–23, 2007 [Proceedings], v. 2, p. 881–884. (Abstract also available at, M., and Stribrny, B., 1999, Platinum-group elements in porphyry copper deposits—A reconnaissance study: Mineralogy and Petrology, v. 65, p. 161–183. (Also available at Quadt, A., Peytcheva, I., Fanger, L., and Heinrich, C., 2005, The Elatsite porphyry Cu-Au deposit, Bulgaria—Ore deposit—Lat. 42° 45? N, Long. 24° 02? E: Ore Geology Reviews, v. 27, p. 128–129. (Also available at, B.K.; Yanev, Yotzo; Nedialkov, Rossen; Moritz, Robert; Peytcheva, Irena; von Quadt, Albrecht; Stoykov, Stanislav; and Zartova, Aneta, 2007, Petrology of Upper Cretaceous island-arc ore-magmatic centers from Central Srednogorie, Bulgaria—Magma evolution and paths: Sofia, Bulgaria, Geochemistry, Mineralogy and Petrology, v. 45, p. 39–77. (Also available at, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the world—Database and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at JSC, 2011, Assarel-Medet JSC home page: accessed September 1, 2011, at
Popov, P., Strashimirov, S., Arnaudova, R., Kanasirski, M., and Popov, K., 1996, Geology and genetical model of the porphyry copper deposits from the Assarel-Medet ore field, in Popov, P., ed., Plate tectonic aspects of the Alpine metallogeny in the Carpatho-Balkan region: UNESCO-IGCP Project No. 356 Annual Meeting, Sofia [Proceedings], v. 1, p. 175–196.
Zartova, Aneta; Nedialkov, Rossen; and Moritz, Robert, 2004, Petrology of the magmatism of the Assarel copper-porphyry deposit: Bulgarian Geological Society Annual Scientific Conference “Geology 2004”, Sofia, Bulgaria, December 16–17, 2004 [Proceedings], p. 113–115. (Also available at