Poster: Patterns in the Copper Isotopic Composition of …
isotopic patterns found in the leach cap and quantifies the degree of leaching. A comparison of the isotopic composition of the three reservoirs among the three deposits …
Geochemical stability of potentially toxic elements in …
tion of the tailings susceptibility to leach PTEs (Karaca et al. 2017). In this regard, leach testing using extracting solutions to mimic diverse environmental and/or disposal scenarios gives an indication of PTEs mobility and helps to identify constitu-ents that are immediately available for release from a given material type (Brough et al. 2013).
(PDF) INVESTIGATION OF THE AMENABILITY OF A COPPER …
in minerals such as pyrite and arsenopyrite are common reasons for refractoriness of gold ores. In this study, the amenability of a copper-rich gold ore (108 g/t Au, 1.60% Cu) to cyanide leaching ...
Treatment of a Copper-Rich Gold Ore by Ammonia Assisted Cyanide Leaching
Ammonia pretreatm ent prior to cyanide leaching, was found to be effective, with a significant improvement in the. extraction of gold from 12.3% to 98.2%, apparently due to the removal of easily ...
Producing Copper Nature's Way: Bioleaching
Heap leaching of ore may involve mesophilic or thermophilic (high temperature) microorganisms, i.e., archaea, depending on the mineral species present and the …
(PDF) Porphyry Copper Systems | Daniela …
Daniela Olivares Sedan. Porphyry Cu systems host some of the most widely distributed mineralization types at convergent plate boundaries, including porphyry deposits centered on intrusions; skarn, carbonate …
Porphyry Copper
Porphyry copper mineralization typically forms within 1–6 km of the paleosurface ( Seedorff et al., 2005; Singer et al., 2008) and is related to underlying plutons emplaced at 5–15 km paleodepth ( Sillitoe, 2010 ). Some deposits, such as Butte, formed at depths somewhat greater than 6 km and show no evidence of boiling ( Rusk et al., 2004 ).
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Copper and critical metals production from porphyry
With ~109,000 Mt of ore, Chile owns 31 porphyry copper deposits ranging in size from 110 Mt to 21,300 Mt and averaging 0.2–1.3% copper, many of which also contain molybdenum, gold and silver (Table A1). 15 of the 31 porphyry copper deposits in Chile are currently being exploited and 7 of them belong to the 20 largest copper mines in the …
Mine Tales: Miami's Inspiration Mine once supplied nearly …
At one time production at this mine supplied 7.5% of Arizona's copper and 3.7% of the nation's. Abundant deposits of chrysocolla, a blue-green copper silicate mineral, led to further development of the area, including the Keystone Mine and Live Oak Mine. Discovered in veins of granite porphyry, the chrysocolla contained around 36% …
Effect of Chloride and Ferrous Ions on Improving …
favored leaching. Keywords: black copper ores; copper recovery; refractory ores; pilot scale; column leaching method 1. Introduction Black copper ores are part of the mineralogy of the so-called exotic deposits. Exotic deposits were formed from the oxidation and leaching of primary porphyry copper de-posits (secondary enrichment) [1].
PORPHYRY COPPER, GOLD, MOLYBDENUM, …
Porphyry deposits are the world's most important source of copper, molybdenum, and rhenium, and are major sources of gold, silver, and tin; other byproduct metals include tungsten, platinum ...
Speciation and leachability of copper in mine tailings from porphyry …
A sequential extraction procedure was used to categorise the metals binding to different minerals in the tailing. The method is based on a five-step procedure developed by Tessier et al. (1979) and adapted to soil and sediments with a four-step method by Mester et al. (1998) and this method is the recommended way to perform sequential …
The Alteration Mechanism of Copper-bearing Biotite and …
Results and Discussion. It was found from previous stable isotopic work that many porphyry copper deposits were related to the early stage alteration (e.g. potassic) caused by fluids of magmatic origin, and the later stage alteration (e.g. phyllic) superimposed on earlier alteration zones, caused principally by meteoric fluids 27, 28.In …
Anatomy of Porphyry-Related Mineralised Au-Cu-Ag-Mo …
Different styles of mineralisation described below display variations in Au and Ag grade as well as metal ratios and metallurgy. More efficient mechanisms of Au deposition, typically …
Hypogene enrichment in Miduk porphyry copper ore …
Where buffer potential of the rock is preserved copper fixation and where it totally eliminated almost complete leaching of copper happened. Consequently, we …
Copper isotopic vectors to supergene enrichment: …
The copper isotopic patterns observed for leached cap limonites from Quellaveco are consistent with Rayleigh models describing leaching of variable amounts of copper from …
Speciation and leachability of copper in mine tailings from porphyry …
The leaching behaviour of copper (Cu) and zinc (Zn) from contaminated soils at the Yongping copper mine were investigated using four extractants, citric acid (CA), oxalic acid (OA ...
Spence Copper Cathode Mine, Atacama Desert, Chile
The supergene enriched and partially oxidised porphyry copper deposit is of Upper Paleocene age (about 57 million years). The deposit is covered by gravels and depth to mineralisation ranges from 80m to 100m below the surface. Oxide and supergene sulphide mineralisation is amenable to heap leaching (atacamite and …
Recovery of Copper by Solution Mining Methods
leaching of copper-bearing ores in the U.S The dissolved copper recovered by this operation was derived from the natural oxidation and leaching of sulfide mineralization in a major porphyry copper deposit located in the headwaters of Bingham Creek. This is the present site of the large-scale, open pit operation at Bingham Canyon, which
Drilling Update at Bell's Perseverance Porphyry Copper …
This style of alteration and leaching is commonly referred to as a "leached cap" situated at the top of a porphyry copper deposit. At 571 meters, the hole crossed through a major fault and breccia zone, and into weakly altered Laramide porphyry intrusive rocks with minor quartz veins with sphalerite, galena and tennantite to 579 meters.
Major Mines & Projects | Toquepala Mine
The Toquepala deposit is considered to be an example of a copper–molybdenum porphyry deposit. The deposit is ovoid, extending over a 3.3 x 3.5 km area. Mineralization has been drill tested to about 950 m from the original land surface. Drilling from within the pit base indicates primary mineralization extends for an additional 930 m below the ...
Supergene Oxidized and Enriched Porphyry Copper and Related Deposits
Supergene leaching, oxidation, and chalcocite enrichment in porphyry and related Cu deposits take place in the weathering environment to depths of several hundred meters. The fundamental chemical principles of su-pergene processes were elucidated during the early decades of the twentieth century, mainly from studies in the western …
Exploration potential of Cu isotope fractionation in porphyry copper
We examined the copper isotope ratio of primary high temperature Cu-sulfides, secondary low temperature Cu-sulfides (and Cu-oxides) as well as Fe-oxides in the leach cap, which represent the weathered remains of a spectrum of Cu mineralization, from nine porphyry copper deposits. Copper isotope ratios are reported as δ 65 Cu‰ = ( ( 65 Cu/ 63 ...
Comprehensive Electrochemical-Chemical Study of Copper …
Molybdenite is the most important molybdenum concentrate, which is mainly recovered as a by-product from porphyry copper deposits. Due to the low efficiency of purification processes such as flotation in the reduction of copper content of molybdenum concentrate to a standard level (i.e., less than 0.5 wt.%), further purification by a …
The Role of Bacteria in the Supergene Environment of the …
The Role of Bacteria in the Supergene Environment of the Morenci Porphyry Copper Deposit, Greenlee County, Arizona ... of copper in the supergene environment, respectively. The 5200 bench traverses a classic, but tilted, enrichment profile consisting of a 200-m-thick zone of leached capping (0.06% Cu, 0.06% S) that overlies a partially …
Haib Copper
NCJV ran into financial difficulties and work was stopped at the Haib deposit in early 1999. In 2004, Koryx Copper (Pty) Ltd (Koryx Copper) was granted the Exclusive Prospecting licence 3140 (EPL) was granted over an area of 74,563.0 ha covering the deposit and a very large surrounding area. This was subsequently renewed in April 2007, 2009 ...
Characterisation of the Sarcheshmeh copper mine tailings
Mineral processing operation at the Sarcheshmeh porphyry copper mine has produced huge quantities of tailings materials containing sulphide minerals in particular pyrite. These tailings materials were geochemically and mineralogically characterised to assess pyrite and chalcopyrite oxidation, acid mine drainage generation, and trace …
Patterns in the Copper Isotopic Composition of Minerals …
temperature leach experiments of (Kimball et al., 2009; Mathur et al., 2005; Wall et al., 2006) where leach solutions from supergene chalcocite and primary chalcopyrite were …
The evolution of supergene enrichment in the Morenci porphyry copper …
Supergene enrichment in the Morenci porphyry copper deposit was formed as a result of the coupled processes of erosion and chemical weathering that accompanied five stages of landscape evolution in the Cenozoic Era. ... studies revealed that acidophilic iron oxidizing bacteria and dissimilatory sulfate reducing bacteria contributed to leaching ...