Radetzki, M. (1975), ‘Metal Mining Resource Exhaustion and the Threat to Material Progress: The Case of Copper’, World Development, 3, pp. 123–36.Radetzi, Marian: Metal Mineral Resource Exhaustion and the Threat to Material Progress. The Case of Copper. World Development, 3, 123–136...
MMG, which controls Las Bambas, said it will complete work on Chalcobamba within five months to begin production in the second half of 2022. The company expects the development of the project to increase its production to 400,000 tonnes of copper concentrate per year in the medium ter...
JUNEAU, Alaska (AP) — The U.S. Environmental Protection Agency is extending until Dec. 2 the timeline to decide whether to proceed with proposed restrictions that would block plans for a copper and gold mine in Alaska’s Bristol Bay region.
The mineralised Bingham stock is part of an Eocene magmatic belt including local volcanic sequences, which are poorly constrained in age but largely erupted prior to or several million years after the emplacement of subvolcanic intrusions (Deino and Keith, 1997; Biek, 2006). The Bingham stock...
Which group of rock forming minerals contains the mineral gypsum? What are dark silicate minerals? What are non-silicate minerals? What are the two most common silicate minerals? Which carbonate minerals are part of the calcite group? What mineral group does bornite belong to? ...
Petrographic observations as well as mineral chemical data indicate that, similar to scheelite, clinozoisite records a polyphase formation. Stanniferous Clinozoisite 1 is considered to belong to the primary hydrothermal mineral assemblage together with Type 1 scheelite and stanniferous titanite. As discu...
(also extending into the northern Apennines) is home to some of the richest ore-mineral deposits in Europe. From late fifth to late third millennia BC, copper, silver, and antimony were extracted from theses ores. Copper is found as a native metal and also was extracted from iron-copper ...
A copper concentrate obtained by flotation of a high grade copper ore containing chalcopyrite as a main mineral constituent is leached at a temperature of 100掳 C. or higher, and under a pressure greater than atmospheric pressure yielding a copper leachate containing ferric ions of at least 5 g...
For each metal, an approximate pH value was found at which solubility deviated from the solubility of metals when they occur in soils at typical (natural) values. This pH was about (pH±0.2): 5.2 for Pb, 6.2 for Zn, and 5.5 for Cu. Thus, pH values below these thresholds may enhance...
Governments enact legislation which enable or disable the activities of mining companies; they provide export permits for strategic minerals such as mineral sands; they can place policy restrictions on mining such as the 3 uranium mine policy; and, as has been demonstrated in the historical account...