The Providencia and Profunda mines (Villamanin, Spain) constitute an unusual carbonate-hosted epithermal gold deposit, connected to Vale-Variscan deep faults. The ore is composed by Cu-Ni-Co-Fe sulfides, sulfarsenides and selenides, hematite and uraninite in quartz-carbonate gangue, occuring as veins and pods located at the intersection of E-W and NE-SW high-angle faults. Significant Au concentrations with subordinate Ag-EGP anomalies have been detected. Au is present in a chemically bound state, but also as native gold or electrum. The deposition temperature ranges from 100° to 200°C, in a low-pressure environment. Sulfur isotopic data show high ³⁴δ ratios, suggesting an evaporitic source. Age dating of uraninite grains by the U-Th-Pb method give 273± 11 M.Y., in agreement with an age of 270± 12 M. Y. from Pb isotopic ratios in sulfides. Lead isotopic data show high Pb-Pb ratios, according with a radiogenic source of metals. This deposit represents a transition between carbonate-hosted epithermal gold deposits and Cobalt-type formed in relation with late events of the Variscan orogeny.