References in periodicals archive ?
Sulfides: galena, argentite, pyrite, tetrahedrite, chalcopyrite, bornite, arsenopyrite, and covellite
In the upper part of the orebody, which was mostly mined out by previous operators, the copper existed predominantly in cyanide soluble secondary copper minerals such as chalcocite, bornite and covellite.
Ore minerals include gold, silver, chalcopyrite (CuFeS2), galena (PbS), bornite (CuFeS4), covellite (CuS), chalcocite (Cu2S), anglesite (PbSO4), sphalerite (ZnS), argentite (Ag2S), cerussite (PbCO3) and smithsonite (ZnCO3).
Examination of thin sections from selected mineralized samples at the University of Alaska petrography lab confirms the presence of widespread pentlandite together with millerite and lesser covellite.
Removal of the waste rock revealed the presence of some extreme unexpected and unknown high grade copper and silver ores, such as the important copper ore mineral bornite, the beautiful crystal covellite, and the high yielding copper ore cuprite.
Hypogene sulphide mineralization consists of chalcopyrite, bornite, covellite and pyrite.
Pyrite, sphalerite and possible covellite occur with massive, banded and cockade textures and host rock clasts.
Mineralization consists of chalcopyrite and bornite with secondary covellite and chalcocite, hosted within gabbroic intrusive rocks associated with a major regional fault system.
The primary copper-bearing minerals occurring in the Moonlight deposit are bornite and chalcopyrite with lesser amounts of covellite and chalcocite.
In the last three months, 44 holes totalling approximately 7,300 metres were drilled to define the near-surface chalcocite blanket amenable to heap leach, SX-EW processing, and 77 holes totaling approximately 34,000 metres were completed to define the underlying covellite and chalcopyrite and gold zones.