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Formation and alteration of the stratiform copper deposits
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
The principal alterations of sulfide ores in a zone of the secondary sulfide enrichment are connected with reactions of copper reduction and iron replacement by copper. In a result, the primary minerals (pyrite, chalcopyrite, bornite) are replaced by covellite, digenite and djurleite. The sequence of replacement, such as: pyrite – chalcopyrite – bornite – covellite – digenite – djurleite – native copper, takes place under conditions of impeded water-exchange. Thus, parageneses and zonation like such a primary oneself appear. The secondary sulfide enrichment zone of the Bankroft deposit can serve as an example.
An Analysis of Copper Concentrate from a Kupferschiefer-type Ore from Legnica-Glogow Copper Basin (SW Poland)
Published in Mineral Processing and Extractive Metallurgy Review, 2021
In Table A3 the mineral composition of the investigated concentrate is presented. The content of all sulfide minerals is about 33%. The sample contains copper sulfide minerals as chalcopyrite, bornite, chalcocite with digenite/djurleite and covellite. Moreover, among the sulfide minerals, the concentrate contains relatively high contents of pyrite with marcasite, galena and sphalerite. Assuming that the content of all sulfides is 100%, the content of non-copper-bearing sulfides in the concentrate is about 30%. The main gangue minerals occurring in the concentrate are clay minerals with micas, calcium and magnesium carbonates and quartz with a content about 46%. The presence of quite high contents of gangues and non-copper-bearing sulfides, equal to 67%, is one of the main reasons for the dilution of the concentrate, which significantly lowers the copper grade in the concentrate.
Investigation of Copper Recovery from a New Copper Deposit (Nussir) in Northern Norway
Published in Mineral Processing and Extractive Metallurgy Review, 2019
Priyanka Dhar, Maria Thornhill, Hanumantha Rao Kota
The Nussir copper deposit is a sedimentary-hosted copper deposit located in the Kvalsund Municipality, Finnmark County, Norway, stretching from Repparfjorden in the east to the western part of the Nussir area. Moen et al. (2014) confirmed the presence of chalcopyrite, chalcocite, bornite, covellite and digenite as the major copper minerals with small amounts of precious minerals, such as gold, silver and platinum group minerals in the ore. The latest mineral resource estimation is from July 2014, which states that Nussir consists of 5.8 million tons of indicated resources and 60.2 million tons of inferred resources, giving a total of 66 million tons of copper ore. This ore contains approximately 0.5–5% copper, which varies significantly based on geographical location.