Bornite

~ Much of the copper of commerce is made from chalcopyrite and bornite, and these ores are more difficult to work. ❋ William McPherson (N/A)

In the easy recognition of the secondary copper sulphides, chalcocite, bornite, etc., the engineer finds a finger-post on the road to extension in depth; and the directions upon this post are not to be disregarded. ❋ Herbert Hoover (1919)

Other minerals of considerable importance in some districts are chalcopyrite and bornite ❋ Unknown (1915)

The ore is chiefly chalcocite and bornite in quartz, and occurs in lenticular veins, from a few inches to 14 feet in thickness. ❋ North Carolina. Board Of Agriculture. (1896)

The mineralization at Talpas consists of coarsely crystalline dark sphalerite and galena with pyrite, chalcopyrite and minor bornite in markedly silicified, fine-grained, thinly laminated, cherty sedimentary rocks that occur below a thick pile of quartz-porphyritic rhyolite flows.

The exposed mineralization consists primarily of malachite, chalcopyrite, pyrite and magnetite, with minor bornite and possibly chalcocite. ❋ Unknown (2011)

Mixed copper mineralization may contain both chalcocite-covellite and chalcopyrite-bornite mineralization. ❋ Unknown (2010)

Specifically, most of the gold and copper discovered so far at La Cantera are spatially associated with quartz-magnetite-chalcopyrite+/- bornite veinlets in potassic altered porphyry and breccias containing elevated quantities of hydrothermal magnetite. ❋ Unknown (2010)

Prior drilling and surface sampling has identified anomalous bornite mineralization in several areas that warrant additional follow up drilling including the JF area to the south where a historic resource was identified. ❋ Unknown (2010)

In DDH DOT-09-NW-06, trace native copper, chalcopyrite and more abundant bornite occur in thin quartz-hematite veinlets in granodiorite exhibiting moderate to strong argillic and potassic alteration. ❋ Unknown (2010)

On both lines holes have intersected significant copper mineralization comprising both chalcopyrite and bornite, predominantly in the two lower ore schist horizons. ❋ Unknown (2010)

Copper mineralization occurs as veinlets and disseminated chalcopyrite and bornite and in thin quartz veinlets throughout the mineralized intervals in moderate argillic and potassic altered granodiorite. ❋ Unknown (2010)

The copper mineralization within the upper 300 metres of the deposit includes both supergene digenite-covellite and hypogene chalcocite-bornite replacing earlier chalcopyrite. ❋ Unknown (2010)

Mineralisation occurs in garnet-rich calc-silicate skarn with sulphide minerals including chalcopyrite, bornite and molybdenite. ❋ Unknown (2010)

Copper mineralization consists of high grade chalcopyrite and bornite hosted in massive hematite mantos. ❋ Unknown (2010)

Within the corridor various historic production and exploration workings have encountered and locally exploited massive chalcopyrite plus chalcocite plus pyrite and/or bornite sulphide mineralization. ❋ Unknown (2010)

Mineralization is principally chalcopyrite, bornite, and electrum. ❋ Unknown (2010)