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Precious metal geochemistry and mineralogy of the ovoid zone of Voisey's Bay magmatic sulfide deposit, Labrador, Canada

机译:加拿大拉布拉多Voisey湾岩浆硫化物矿床卵形带的贵金属地球化学和矿物学

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摘要

The Voisey’s Bay Ni-Cu-Co deposit, located in northern Labrador, is considered to be a PGE poor, magmatic sulfide deposit, but anomalous regions containing elevated concentrations of Pt, Pd, Au and Ag have been reported during routine assay. Only limited data is available which documents the types of precious metal occurrences that are present in these regions. In this thesis, a thorough investigation of the PGE and precious metal-minerals has been conducted for the Ovoid, Mini-Ovoid and Discovery Hill deposits. The results were compared to previously documented occurrences in a hornblende-gabbro dyke in the Southeast Extension zone. The significance of these occurrences has been evaluated in reference to potential for recovery of Pt, Pd, Au and Ag, and the genesis of the mineralization in the anomalous regions. Because the concentrations of precious metals at Voisey’s Bay deposit are low, unconventional methods of analysis were used to concentrate and analyze the mineral phases present. The dominant mineral phases that are present are sperrylite and froodite. Electrum, stützite and volyksite account for minor to trace proportions of the precious metal minerals. Analysis of sulfide minerals for Pt, Pd, Au and Ag by LA-ICPMS revealed that, in regions that represent very fractionated magma, most of the precious metal mass is present as discrete mineral phases containing Bi, Te, As, Sn and Sb, and only small proportions of Pd are found in solid solution in pentlandite and galena. The presence of semi-metals in the sulfide melt is the key component necessary to crystallize domains rich in PGM. Semi-metals were likely inherited through local crustal interactions of parental magma with Tasiuyak gneisses.udThe major conclusions drawn from this study are 1) that even at low-PGE grade deposits such as Voisey’s Bay, PGM are able to crystallize if sufficient amounts of semi-metals are present; and 2) recovery of the Pt, Pd, Au and Ag at Voisey’s Bay may be possible because the majority of the precious metal mass is associated with minerals that are already recovered in the Ni or Cu concentrates, or they are present as mineral grains large enough to be concentrated alone.
机译:位于拉布拉多北部的Voisey湾Ni-Cu-Co矿床被认为是PGE贫乏的岩浆硫化物矿床,但是在常规分析中据报道异常区域包含较高的Pt,Pd,Au和Ag浓度。仅提供有限的数据来记录这些区域中存在的贵金属的类型。在本文中,对卵形,微型卵形和愉景山矿床的PGE和贵金属矿物进行了深入研究。将该结果与先前记录的东南扩展区的角闪石-鹅卵石堤坝中发生的事件进行了比较。参照Pt,Pd,Au和Ag的回收潜力以及异常区域矿化的成因,对这些事件的重要性进行了评估。由于Voisey湾矿床中的贵金属浓度较低,因此使用了非常规的分析方法来浓缩和分析存在的矿相。存在的主要矿物相是闪锌矿和闪锌矿。 Electrum,Stützite和Vykkite占微量到痕量的贵金属矿物。通过LA-ICPMS对Pt,Pd,Au和Ag的硫化物矿物进行分析后发现,在代表岩浆非常分离的区域中,大多数贵金属物质以离散的矿物相形式存在,包含Bi,Te,As,Sn和Sb,在方解石和方铅矿的固溶体中仅发现少量Pd。硫化物熔体中半金属的存在是使富含PGM的晶畴结晶所必需的关键成分。半金属很可能是通过父母岩浆与Tasiuyak片麻岩之间的局部地壳相互作用而继承的。 ud这项研究得出的主要结论是:1)即使在PGE等级较低的矿床(如Voisey's Bay),如果足够量的PGM也会结晶。存在半金属; 2)在Voisey湾回收Pt,Pd,Au和Ag是可能的,因为大多数贵金属物质与已经在Ni或Cu精矿中回收的矿物有关,或者它们以大的矿物颗粒形式存在足以独自集中。

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    Kelvin Michelle;

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