Bolcana

Porphyry copper deposit in Hunedoara, Romania

Names and other identifiers

GMRAP ID 361
Alternate names Bolcana Troita
Tract name Apuseni Mountains (150pCu6003)
Group name Bolcana Group
Included sites Bolcana, Magura
Site status deposit

Geographic location

Country Romania
State or province Hunedoara
Geographic location 23.01, 45.994
Geologic map unit 23.01, 45.994
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 10Ma
Age determination method Re-Os
Age range 10 Ma
Age reference Singer and others (2008)
Minerals actinolite, albite, anhydrite/gypsum, biotite, bornite, chalcocite, chalcopyrite, chlorite, epidote, gold, hematite, illite/smectite, kaolinite, magnetite, molybdenite, pyrite, pyrophyllite, sericite, silver
Associated rocks andesite porphyry, breccia, ophiolite, andesite, dacitic tuff, diorite, rhyodacite
Tectonic setting postconvergence
Stratigraphic age Miocene

Commodity and development information

Development status Past Producer
Major commodities Cu, Au
Tonnage (Mt) 90Mt
Cu grade (%) 0.3%
Au grade (g/t) 0.03g/t
Contained copper 270,000t
Gold-Moly ratio -9999

Reference information

Comments In about 2000, The Bolcana copper-gold porphyry deposit was being exploited by Minvest through small scale open pit and underground operation. Bolcana has been mined in the past for gold, but details of historic production are not known.The Bolcana project did not have proven or probable reserves and 2001–2002 exploration programs were an exploratory search for proven or probable reserves. The deposit is hosted in quartz andesite that penetrates detrital sediments and volcanic rocks in a subvolcanic setting. Metaliferi Mountains.
Study area name Europe
References Berbeleac and others (1995); Cardon and others (2008); Drew and Berger (2001); Ianovici and others (1977); Milu and others (2003); European Goldfields Ltd. (2004); Singer and others (2008); Vlad and Orlandea (2004)
Site reference Sutphin and others (2013)
Berbeleac, Ion; Iliescu, Dan; Andrei, Justin; Ciuculescu, Ovidiu; and Ciuculescu, Rodica, 1995, Relationships between alterations, porphyry copper-gold and base metal-gold hydrothermal vein mineralizations in Tertiary intrusions, Talagiu area, Zarand Mountains: Romanian Journal of Mineral Deposits, v. 76, p. 31–39.
Berbeleac, Ion, Popa, T., Marian, I., Iliescu, D., and Costea, C., 1995b, Neogene porphyry copper-gold and gold-bearing epithermal deposits in South Apuseni Mountains, Romania, 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. 665–670.
Cardon, O., Reisberg, L., Andre-Mayer, A.S., Leroy, J., and Milu, V., 2008, Re-Os isotope systematics—Sources and age of epithermal and porphyry copper deposits [abs.]: Geochimica et Cosmochimica Acta, v. 70, no. 18, Supplement 1, p. A82. (Also available at http://goldschmidtabstracts.info/2006/871.pdf.)
Drew, L. J., and Berger, B.R., 2001, Model of the porphyry copper/polymetallic vein kin-deposit system—Application in the Metaliferi Mountains, Romania, in Piestrzy?ski, Adam, and others, eds., Mineral deposits at the beginning of the 21st century: Lisse, The Netherlands, A.A. Balkema Publishers, Society for Geology Applied to Mineral Deposits (SGA) Biennial Meeting, 6th, Krakow, Poland, August 26–29, 2001 [Proceedings], p. 519–522.
European Goldfields Ltd., 2004, Annual report 2003: European Goldfields Ltd., 40 p.
Ianovici, V., Vlad, ?., Borco?, M., and Bo?tinescu, S., 1977, Alpine porphyry copper mineralization of West Romania: Mineralium Deposita, v. 12, p. 307–317. (Also available at http://dx.doi.org/10.1007/BF00206169.)Milu, Viorica, Leroy, J.L., and Piantone, Patrice, 2003, The Bolcana Cu-Au ore deposit (Metalliferi Mountains, Romania)—First data on the alteration and related mineralisation: Comptes Rendus Geosciences, v. 335, no. 8, p. 671–680. (Also available at http://dx.doi.org/10.1016/S1631-0713(03)00120-2.)Singer, 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 http://pubs.usgs.gov/of/2008/1155/.Vlad, Serban-Nicolae, and Orlandea, Eugen, 2004, Metallogeny of the gold quadrilateral—Style and characteristics of epithermal-subvolcanic mineralized structures, South Apuseni Mts., Romania: Studia Universitatis Babes-Bolyai, Geologia, v. 49, p. 15–31. (Also available at http://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=1211&context=geologia.)