The temporal and spatial relationship between tungsten and gold mineralisation in the Otago Schist, New Zealand
Tungsten mineralisation within the Otago Schist is hosted by hydrothermal quartz veins that formed close to the brittle-ductile transition zone. The Otago Schist Belt hosts numerous orogenic gold deposits, including the Macraes mine, a number of which also host the tungsten ore mineral scheelite. Despite the strategic importance of tungsten, no commercial mining of scheelite in Otago has occurred since the 1960s, and the Macraes operation does not recover tungsten despite mining tungsten ore. This study examines the spatial and temporal relationships between gold and tungsten from a microscopic up to a deposit scale, focusing on the Macraes deposit and applying the findings to the wider Otago region. Understanding this relationship is essential for modelling and extracting tungsten in Otago, and in the exploration for new deposits. Macraes
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MULTIPOLYGON (((170.409813383736 -45.3392144728741,170.501578657676 -45.3412599512349,170.499002911411 -45.3996965301032,170.407143285844 -45.397646902954,170.409813383736 -45.3392144728741)))
Farmer, Lauren, “The temporal and spatial relationship between tungsten and gold mineralisation in the Otago Schist, New Zealand,” Otago Geology Theses, accessed April 27, 2018, http://theses.otagogeology.org.nz/items/show/628.