The Bolcana Cu–Au ore deposit (Metaliferi Mountains, Romania): first data on the alteration and related mineralisation

Viorica Milu (1) , Jacques L Leroy (2) , Patrice Piantone (3)

1 GEOLOGICAL INSTITUTE OF ROMANIA - Department of Mineral Resources and Environmental Geology
2 G2R - Géologie et gestion des ressources minérales et énergétiques
3 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

The Bolcana ore deposit (Metaliferi Mountains, western Romania) is a porphyry ore deposit with associated epithermal veins. On the basis of different parageneses, four alteration types were distinguished: potassic, phyllic, argillic and propylitic. The mineralogical and geochemical data and estimated crystallisation temperatures of alteration minerals indicate an evolution of the system from an early period of porphyry type mineralisation (Cu + Au) to a late period of low-sulphidation epithermal mineralisation (Au + base metal).

Keywords: Cu-Au ore deposit; porphyry-epithermal deposit; hydrothermal alteration; geothermometer; Metaliferi Mountains; Romania gisements de cuivre-or; gisement de type porphyre-épithermal; altérations hydrothermales; géothermomètres; monts Métallifères; Roumanie

Domains: Earth Sciences

Viorica Milu, Jacques L Leroy, Patrice Piantone. The Bolcana Cu–Au ore deposit (Metaliferi Mountains, Romania): first data on the alteration and related mineralisation. Comptes Rendus. Géoscience, 2003, 335 (8), pp.671 - 680. ⟨10.1016/s1631-0713(03)00120-2⟩. ⟨hal-04082508⟩