Location:

Portugal

Arsenopyrite occurs with tungsten and gold mineralization cutting greisenized granites. Native gold is found in the oxidation zone.

Major Minerals:

Arsenopyrite, scheelite

Minor Minerals:

Pyrrhotite, pyrite, marcasite, chalcopyrite, covelline

Trace Minerals:

Include native gold, native bismuth, tetradymite, tellurobismutite, enargite group minerals

Textures:

Inclusions of native gold and native bismuth occur in arsenopyrite and locally in pyrite. Coarser grained gold is associated with tellurobismutite and tetradymite about arsenopyrite crystals. There is extensive alteration of arsenopyrite to secondary arsenates that contain fine-grained supergene high fineness gold