These values are associated with pyrrhotite, pentlandite and chalcopyrite
mineralization found at two sites along a gabbroic anorthosite, quartzite contact;
Most of these veins are enriched with copper-bearing sulfides and oxides, such as tetrahedrite, galena, chalcopyrite
, pyrite, sphalerite and magnetite.
In other intervals (as shallow as 20m below the surface) chalcopyrite
was observed in trace to minor amounts.
The copper flotation concentrate contains Cu, Ni, Co, Fe which were associated with chalcopyrite
, pentlandite, pyrite and pyrrhotite phases respectively.
It became a major supplier in about 1985 of "textbook-perfect" chalcopyrite
, sphalerite, pyrite and other attractive minerals.
Analysis by X-ray diffraction shows the product to be a chalcopyrite
called copper indium disulfide.
Kesterites are quaternary compounds with a crystalline structure very similar to that of chalcopyrites
Managing Director Tony Schoer said; "We are very encouraged by the strong chalcopyrite
mineralisation seen in the core of CETD3.
The mineralization on this property consists of pitchblende, uraninite and brannerite with minor chalcopyrite
, pyrite and pyrrhotite as well as native Selenium.
It should be noted that molybdenite and chalcopyrite
mineralisation was observed in other skarn and breccia zones.
Sulphide mineralization consists of weak chalcopyrite
, pyrite and less than 1% quartz veins associated with sericite, clay, chlorite alteration.
43 metres true width) of net-textured to massive sphalerite with disseminated chalcopyrite
The upper lens, at 200 metres depth, also has a demonstrable component of magnetite associated with the massive sulphides and contains lower grade copper values, lacking chalcopyrite
replacement and upgrading.
Mineralization assemblages commonly contained pyrite with lesser pyrrhotite, with or without galena, sphalerite, chalcopyrite
, and/or arsenopyrite.
1 km west of Nova Brasilia, is formed by sulfides and carbonates associated with quartz veins (pyrite, chalcopyrite