Bruce mine, Sishen, Kathu, Postmasburg manganese field, Northern Cape Province, South Africa
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High-grade iron ore mine.
Located close to the Sishen mine.
Mn minerals are found within Wolhaarkop chert breccia. They are found in the upper portion of the breccia among, i.a., void-fills. The outer part of the fills consists of norrishite, followed by serandite + albite + feldspar + granular sugilite. The cores of some vugs have armbrusterite and/or fibrous sugilite. There are also unzoned assemblages of similar mineralogy, but with minor kentrolite, strontianite and witherite. Dating of fibrous sugilite yields the age of 620.2 ± 3.3 Ma, thus younger for the Kalahari Manganese Fields assemblages.
11 valid minerals.
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- John M. Moore, Barbara K. Kuhn, Darren F. Mark, and Harilaos Tsikos (2011): A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. European Journal of Mineralogy 23, 661-673.