Four kimberlite pipes occur in close proximity—three are being exploited, while the fourth will be brought into production in 2018.Diavik is now expected to operate through 2024; upon closure, the equipment, buildings, and infrastructure will be removed and the land returned as closely as possible to its original condition.This data indicates that the mineralization was derived mainly from a mantle source with some quantities of crustal components introduced into the rockforming and ore-forming systems during mineralization and magmatic emplacement.Together with the widespread occurrence of late Carboniferous-Permian mafic–ultramafic complexes and associated Permian Cu-Ni deposits in the western part of the Central Asian Orogenic Belt (Northern Xinjiang), we conclude that mantle-crustal interactions were active during the accretion-collisional processes that led to the Cu-Ni mineralization and considerable continental growth in the late Carboniferous-Permian to mid-Triassic.This study is the first attempt to use the Re-Os isotope system to directly date chalcopyrite, bornite, pyrite and pyrrhotite at Jiama. The geology suggests the Cu and Mo mineralizations at Jiama are both related to porphyry intrusions, and the Cu mineralization should also have occurred in Miocene based on the molybdenite Re-Os age and porphyry zircon U-Pb ages.Both rhenium and osmium are strongly siderophilic (iron loving), while Re is also chalcophilic (sulfur loving) making it useful in dating sulfide ores such as gold and Cu-Ni deposits.Primitive mantle normalized PGE patterns of the massive Cu–Ni ores are of the Pt–Pd type with relatively steep and trough-like patterns, which are similar to those of the host rocks.
The relatively high Pt/Pd ratios of the Baimazhai massive sulfide ores (averaging 0.83) and their host rocks imply that the Baimazhai sulfides formed in a single sulfide saturation event, but not through multiple sulfide injections.Since mining operations began in 2003, it has produced over 100 million carats of diamonds.This article will review the discovery, development, and operation of the mine, which is situated in a remote subarctic setting in the Northwest Territories.High Ir contents (0.77–5.52 ppb, averaging 2.35 ppb) and dramatically variable Pd/Ir ratios (4.76–296, averaging 138) of the massive sulfide ores suggest that the Baimazhai sulfide ores might have suffered significant late stage hydrothermal alteration. The Diavik diamond mine, shown here in February 2015, is located on a small island in Lac de Gras, approximately 300 km northeast of Yellowknife and 220 km south of the Arctic Circle, in a remote region of Canada’s Northwest Territories. The Diavik mine, located in the Archean-age Slave geologic province in northern Canada, is one of the world’s preeminent sources of gem diamonds.Peridotite xenoliths which are thought to sample the upper mantle sometimes contain supra-chondritic Os-isotopic ratios.