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.**

加拿大大部分铜和金的初级生产都来自一种叫做碱性斑岩矿床的矿床。这些矿床由一种火成岩侵入物承载或与之相关，这种火成岩侵入物被认为是由俯冲带上地壳深处的地幔融化而产生的。虽然这些矿床开采的是铜和金，但矿石通常含有少量的贵金属铂和钯。考虑到被认为是富金碱性斑岩形成的岩浆的成因，这些岩浆中铂和钯的含量至少应该与金的含量一样丰富。由于铜和金的矿石中铂和钯的含量相对较低，这些贵金属的命运仍然是个谜。拟议的项目将系统地检查与描述良好的铜金碱性斑岩相关的所有岩石，使用精确和敏感的分析方法来检测铂和钯，即使其浓度远低于经济等级。研究结果将用于探测和描述斑岩矿床环境中铂和钯的行为，目的是显示缺失金属的沉积位置。由于预计铂和钯最初存在于该系统中，而在铜金矿中没有发现大量铂和钯，因此它们很可能在与成矿系统相关的热流体流动的影响下沉积在附近的其他岩石中。这类矿床可能分散在浓度很低的地方，在经济上意义不大，然而识别铂和钯矿是困难的，因为它们的品位只有百万分之几，远低于用肉眼可探测到的矿石水平，在经济上很有意义。因此，也有可能遇到以前从未被发现的铂和钯的高品位带。这项工作将为新黄金公司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