Minerals include chalcocite, bornite and chalcopyrite, with associated malachite, azurite and cuprite. Kennecott, Alaska - Wikipedia A barren, leached cap, in places up to 300 metres thick, overlies a thick zone of high grade secondary supergene mineralisation of the main orebody, largely chalcocite and covellite, which in turn overlies the ...
Anhedral chalcocite (bluish-grey) replacing pyrite (light yellow) in colloform goethite (different darker grey shades), small covellite grains (blue); Thorn T ree Mine, Okamu- via Farm 144, W indhoek District, Khomas Region, Namibia; PPL
The secondary carbonates and silicates have been deposited adjacent to the ... grains where copper sulfides are not present. The most abundant copper minerals in the deposits are malachite, chalcocite, azurite, and chrysocolla. Malachite is the most prominent mineral, ... chalcopyrite, bornite, chalcocite, covellite, malachite, azurite ...
Chalcopyrite Bornite Covellite Digenite Chalcocite Malachite CuFeS 2 Cu 5 FeS 4 CuS Cu 9 S 5 Cu 2 S CuCO 3 (OH) 2 Azurite Cuprite Tenorite Chrysocolla Native copper Cu 2 (CO 3) 2.Cu(OH) 2 Cu 2 O CuO (Cu,Al) 2 H 2 Si 2 O 5 (OH) 4.nH 2 O Cu The traditional method applied for the flotation of copper oxide or mixed ores is sulphidisation, which
Llechweddhelyg Mine, Penrhyncoch, Ceredigion: intense supergene alteration of primary chalcopyrite is preserved at this site and the chalcocite-dominated secondary sulphide assemblage occasionally reveals bornite in polished section, occurring as an intermediate alteration phase intergrown with relict chalcopyrite (Mason, 1994).
Figure 2 shows the results of contact angle measurements of chalcocite, bornite, and chalcopyrite. The contact angles of untreated chalcocite, bornite, and chalcopyrite were 58.4, 65.3, and 73.9 degrees, respectively. After oxidation treatment, the contact angle of each mineral decreased to 43.7, 58.1, and 63.2 degrees, respectively.
Oct 29, 2015· Ore microscopy study for some samples from Mawat complex NE Iraq (part of Zagros Suture Zone) showed the presence of copper ore minerals was irregularly distributed, mainly throughout the basic rocks of Mawat Ophiolite Complex. The main sulfides minerals identified were: chalcopyrite, pyrite, bornite, chalcocite and covellite. Iron hydroxides/oxides including goethite and magnetite …
chalcopyrite (Cp) replacement of bornite is cross-cut by a vein filled with light-brown chalcocite (Cc) and light-yellow pyrite (Py). h) Sample 8650: Brown bornite (Bn), replaced by chalcopyrite (Cp) and chalcocite (Cc), while covellite veins (Cv) cross-
Minerals commonly associated with chalcocite include malachite, azurite, chalcopyrite, bornite and covellite. CRAWFORD COUNTY: Chalcocite is one of the components of the ore at the Plum Creek copper mine in the SE SW Sec. 26 T.8N R.5W northwest of Wauzeka and in adjacent areas along Otter Creek (Heyl and West, 1983).
Chalcopyrite Mineral Facts: Chemical Formula: CuFeS 2 ie., Copper Pyrites, Yellow Copper Ore.. Colors: Brass yellowish, sometimes surfaces are tarnished to iridescent. Its streak is greenish black.. Hardness: 3.5 to 4. Density: 4.2 For Both the density and hardness reading for aragonite are higher than normally found for calcite.
Both bornite and chalcopyrite are being replaced by light-brown twin lamellae of chalcocite (Cc). The bluish covellite (Cv) exsolution lamellae emerge out of chalcocite and bornite, while some covellite veins cross-cut bornite, chalcopyrite and chalcocite are terminated by faint-yellowish or creamy pyrite (Py).
Apr 20, 2017· Chalcopyrite is most often found with pyrite and other sulfide minerals, along with sphalerite, galena, dolomite, tourmaline and quartz. Chalcopyrite can oxidize to form other secondary minerals including malachite, azurite, and cuprite. Associated ore minerals include pyrite, sphalerite, bornite, galena, and chalcocite.
Dec 15, 2013· The mineral is associated with chalcocite in zones of secondary enrichment (supergene) of copper sulfide deposits. Commonly found with and as coatings on chalcocite, chalcopyrite, bornite, enargite, pyrite, and other sulfides, it often occurs as pseudomorphic replacements after other minerals.
188 12. Supergene Ore and Gangue Characteristics. Silicates Secondary silica, Kaolinite, Illite, Jarosite Carbonates Sphalerite < Tetrahedrite < Chalcopyrite < Bi-Sb-Hg Sulphosalts < Galena < Arsenopyrite < Pyrite
vein ore consists of dolomite filling vein and cementing breccia of sphalerite, galena, chalcopyrite, and fine-grained intergrowth of chalcopyrite and unknown sulfide; some ore carries bornite and chalcocite. later luzonite and covellite cut and replace gangue and early sulfides. arboreal
In recent years, secondary sulfide ores (ex. chalcocite) have sometimes been associated with primary sulfide ores (ex. chalcopyrite and bornite), which have been the main ore of copper until now.
Jul 26, 2017· In the Moroccan High Atlas, two sulfide deposits hosted by Jurassic dolostones underwent significant weathering. In the Cu deposit of Jbel Klakh, several stages of supergene mineralization are distinguished: (1) the replacement of hypogene sulfides in the protolith (chalcopyrite) by secondary sulfides in the cementation zone (bornite, digenite, chalcocite, covellite), (2) the formation of ...
Chalcocite forms from the alteration of other minerals, especially other copper sulfides such as Bornite, Covellite, and Chalcopyrite, and may also form pseudomorphs after these minerals. It often forms in association with Chrysocolla, with the Chrysocolla forming as an alteration around the Chalcocite.Chalcocite is named after the Greek word chalcos, which means "copper" in Greek, in …
chalcocite group botryoidal bornite bornite with chalcopyrite chalcocite group botryoidal chalcocite The!colorful!copper!carbonate!minerals,!blue!azurite!and!green
The hypogene sulphide mineralogy consists predominantly of chalcopyrite, bornite and chalcocite. Based upon relationships with metamorphic biotite, vein sulphides and most of the sulphides in cemented lenses were precipitated during or after biotite zone greenschist facies metamorphism.
92 photos of Chalcocite associated with Bornite: Cu 5 FeS 4: 85 photos of Chalcocite associated with Malachite: Cu 2 (CO 3)(OH) 2: 79 photos of Chalcocite associated with Chalcopyrite: CuFeS 2: 51 photos of Chalcocite associated with Djurleite: Cu 31 S 16: 46 photos of Chalcocite associated with Pyrite: FeS 2: 31 photos of Chalcocite associated ...
It is often associated with sphalerite and galena. It oxidizes to form copper minerals such as malachite, azurite, cuprite and tenorite. Copper liberated from the breakdown of chalcopyrite may accumulate in secondary supergene enrichment zones, forming chalcocite, bornite, covellite and similar minerals.
The slide contains Chalcopyrite (40%), Bornite (40%)) garnet (20%)) chalcocite (I%), and trace malachite. The bornite is clean of other minerals except along the margins. The margins contain small blebs of chalcopyrite. Bornite can be seen all through the chalcopyrite, but the contact between the bornite and the chalcopyrite is sharp for the ...
in each. After comminution to a target grind size of 80% passing 150 μm, each ore type is subjected to flotation to recover the copper sulphide minerals (chalcopyrite, bornite, chalcocite, covellite). The oxide float tails and a large proportion of the mixed float tails are then treated by atmospheric leaching to extract
In the past, copper sulfide minerals, such as chalcopyrite (CuFeS 2 ), bornite (Cu 5 FeS 4 ), chalcocite (Cu 2 S), and covellite (CuS), are used to refine copper worldwide [3, 4]. With the ...
The mining of chalcocite has taken place for centuries and is one of the most profitable ores due to its high copper content, which is nearly 80% by weight. Chalcocite has been known to form pseudomorphs of the minerals chalcopyrite, pyrite, enargite, bornite, covellite, millerite, galena and sphalerite.
chalcocite and covellite averaged 360 ft in height, was between 2 ft arid 60 ft wide, and extended along its northeasterly plunge for 1,500 ft. Origin and geologic history of deposits is complex, obscure, and multiple hypotheses are still debated. Mainly chalcocite and covellite, with minor enargite, bornite, chalcopyrite, luzonite, and pyrite.
After chronoamperometry at 0.70 and 0.80 V vs. SHE, respectively, for 6 and 2 h, analyses by using S-SAXRD revealed peaks of bornite on oxidized chalcopyrite electrodes.