Gold production from refractory minerals in the Pyritic Belt
DOI:
https://doi.org/10.21701/bolgeomin.130.2.007Keywords:
bioleaching, cyanidation, hydrometallurgy, gold, Pyrite BeltAbstract
The Pyritic Belt is a world class metalogenetic province, with more than 70 known deposits of volcanogenic massive sulphides. These deposits contain relevant resources of sulphur, iron, basic metals and, to a lesser extent, gold and silver. The Spanish Geological Survey (IGME) has recently played a main role in several activities related to the research, exploration and production of gold. As a part of this public research, some of the developments of IGME in the field of hydrometallurgy have been dedicated to the alternative treatment of refractory gold ores, which are quite abundant in the Pyritic Belt. These treatments aim to recover the gold contained in such ores, plus the extraction of any other metal that may lead to an economic benefit, thus reducing production costs. To achieve this goal, some traditional treatments such as cyanidation may be used in combination with innovative ones, such as high pressure acid leaching, oxidizing roasting and bioleaching.
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