Titlebook: Macraes Orogenic Gold Deposit (New Zealand); Origin and Developme Dave Craw,Doug MacKenzie Book 2016 The Author(s) 2016 Gold Mining.Tungste

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Introduction: Macraes Mine as an Orogenic Gold Deposit,y minor Au production. Modern exploration and mining has developed from these small beginnings into a world class mine operation which has produced?>4 million ounces of Au from a total resource exceeding 10 million ounces. The modern Macraes deposit is dominated by deformed and altered metasediments

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Implicit

Structure and Lithology,hear zone is?>500?m thick and structurally overlies upper greenschist facies rocks. Host schists have two end-member rock types: micaceous schist and feldspathic schist, and these are interlayered at all scales. Associated black sheared rocks are micaceous and have elevated graphite contents. Syn-mi

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哥哥噴涌而出

negligence

Geochemistry of the Macraes Gold Deposit,llisation and replacement of micas mobilised Cr locally. Graphitisation of micaceous shears has locally increased the non-carbonate carbon content substantially. Sulphur was introduced during mineralisation as well, but some unmineralised protoliths have locally-elevated sulphur in metamorphic pyrit

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公理

Graphite and Shear Zone Evolution,er and as structurally-controlled hydrothermal precipitates. Hydrothermal graphite is particularly enriched in Macraes deposit, in micaceous shears. Graphite deposition had physical effects on shear-related mineralisation, by lubricating the structures with positive feedback effects. In addition, gr

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crutch

Mining, Processing and Environment at Macraes,gold. Refractory ore, mainly sheared micaceous schist, yielded recoveries below 50?% of the gold. Ore consisting of graphitic sheared schist is preg-robbing, and gold recovery was also low. Introduction of pressure oxidation processing before cyanidation has increased gold recovery. Pressure oxidati