PGE distribution in the New Afton Cu-Au porphyry deposit**

New Afton 铜金斑岩矿床中 PGE 的分布**

• 批准号: 536604-2018
• 负责人: Mungall, James
• 金额: $ 1.82万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=660428
• 关键词: PGE; distribution; New; Afton; Cu

Much of Canada's primary production of both copper and gold comes from deposits called alkalic porphyry deposits. These deposits are hosted by or associated with a type of igneous intrusion that is thought to be derived by melting of the mantle deep beneath the Earth's crust over subduction zones. Although these deposits are mined for copper and gold, the ores commonly contain minor amounts of the precious metals platinum and palladium. Consideration of the genesis of the magmas thought to be responsible for the formation of gold-rich alkalic porphyries suggests that these magmas should be at least as rich in platinum and palladium as they are in gold. Since the ores of copper and gold contain relatively low concentrations of platinum and palladium, the fate of these precious metals remains a mystery. The proposed project will systematically examine all of the rocks associated with a well-described copper-gold alkalic porphyry using precise and sensitive assay methods to detect platinum and palladium even at concentrations far below economic grades. The results will be used to attempt to detect and describe the behaviour of platinum and palladium in the porphyry deposit environment, with the aim of showing where the missing metal has been deposited. Since platinum and palladium are expected to have been present in the system initially, and they are not found in large amounts in the copper-gold ore, it is likely that they have been deposited in other nearby rocks affected by flow of hot fluids associated with the ore-forming system. Such deposits may turn out to be dispersed at such low concentrations that they are insignificant economically, however recognition of platinum and palladium ores is difficult because they are economically interesting at grades of only a few parts per million, far below levels at which the ore minerals are detectable with the naked eye. It is therefore also possible that high-grade zones of platinum and palladium will be encountered that have never previously been recognized. The work will provide New Gold Inc and other Canadian mining companies with new insight into the distribution of precious metals in Canadian mineral deposits.**

加拿大大部分的铜和金的主要生产来自被称为碱性斑岩矿床的矿床。 这些矿床是由一种火成岩侵入体所承载或与之相关，这种火成岩侵入体被认为是由俯冲带上方地壳深处的地幔熔融而产生的。 虽然这些矿床是为铜和金而开采的，但矿石通常含有少量的贵金属铂和钯。 对被认为是形成富金碱性斑岩的岩浆成因的考虑表明，这些岩浆中的铂和钯至少应该与金一样丰富。 由于铜和金矿石中铂和钯的含量相对较低，这些贵金属的命运仍然是一个谜。 拟议的项目将系统地检查与一个描述良好的铜金碱性斑岩有关的所有岩石，使用精确和灵敏的分析方法检测铂和钯，即使浓度远低于经济等级。 这些结果将用于探测和描述铂和钯在斑岩存款环境中的行为，目的是显示丢失的金属已经沉积。 由于铂和钯预计最初存在于该系统中，并且在铜金矿石中没有发现大量铂和钯，因此它们很可能已沉积在受与成矿系统有关的热流体流动影响的其他附近岩石中。 这些矿床可能分散在如此低的浓度下，以至于它们在经济上微不足道，然而，铂和钯矿石的识别是困难的，因为它们的经济意义仅在于百万分之几的品位，远远低于用肉眼可检测到的矿石矿物的水平。 因此，也有可能会遇到以前从未认识到的铂和钯的高品位区。这项工作将为New Gold Inc和其他加拿大矿业公司提供有关加拿大矿藏中贵金属分布的新见解。