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Ore minerals in IOCG deposits are typically copper-iron sulfide chalcopyrite and gangue pyrite, forming 10–15% of the rock mass. Supergene profiles can be developed above weathered examples of IOCG deposits, as exemplified by the Sossego deposit, Para State, Brazil , where typical oxidised copper minerals are present, e.g.; malachite ...
Primary cobalt deposits are rare, such as those occurring in hydrothermal deposits, associated with ultramafic rocks, typified by the Bou-Azzer district of Morocco. At such locations, cobalt ores are mined exclusively, albeit at a lower concentration, and thus require more downstream processing for cobalt extraction. [93] [94]
This is a list of printed books, manuscripts, letters, music scores, comic books, maps and other documents which have been sold for more than US$1 million. The dates of composition of the books range from the 7th-century Quran leaf palimpsest and the early 8th-century St Cuthbert Gospel , to a 21st-century autograph manuscript of J. K. Rowling ...