a Photomicrograph (reflected light) and b–e backscattered electron images showing representative ore assemblages. a Texturally equilibrated arsenopyrite–pyrite–pyrrhotite assemblage of the Western Zone. Arrows indicate replacement of arsenopyrite by pyrrhotite. b Gold intergrown with ullmannite, arsenopyrite, and pyrrhotite in the auriferous Consort Bar in the Western Zone c Arsenopyrite from the type II mineralization of the Central Zone containing inclusions of loellingite, maldonite, and native bismuth. d Relict loellingite with gold inclusions replaced by arsenopyrite (late mineralization in the Eastern Zone). e Arsenopyrite showing an oscillatory zoning with inclusions of gold and K-feldspar from the Western Zone
The alteration zones of the different ore bodies described above
are associated with different ore parageneses (Fig. 10 ).
In the Western Zone, the ore assemblage is dominated by
arsenopyrite, pyrite, pyrrhotite, chalcopyrite, and gold
(Fig. 10 a,b).
More rarely, arsenopyrite is intergrown with pyrite and pyrrhotite
(Fig. 10 a).
Native gold grains occur as inclusion in arsenopyrite (Fig.
10 e), intergrown with sulfides (Fig. 10 b), and as fracture
fillings in vein, alteration, and ore minerals. .
The type II mineralization in the Central Zone contains
disseminated, euhedral arsenopyrite that encloses anhedral
loellingite (Fig. 10 c).
The arsenopyrite often contains inclusions of loellingite and
pyrrhotite (Fig. 10 d).
A buffering sulfide assemblage is only present in the Western Zone
where the arsenopyrite–pyrite–pyrrhotite assemblage is in textural
equilibrium (Fig. 10 a).
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