2020
DOI: 10.25131/sajg.123.0033
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PGE distribution in the chromitite layers at Eastern Chrome Mine, Eastern Bushveld Complex, South Africa: A descriptive study with comparison of EPMA and LA-ICP-MS methods for detection of trace PGE in base metal sulphides

Abstract: A descriptive petrographic study was carried out on the chromitites (LG-6 to UG-3a) of a single borehole from the Winterveld Chrome Mine, Eastern BC, along with analysis by both EPMA and LA-ICP-MS of the PGE contents of base metal sulphides (BMS) found within these layers. EPMA measurements were optimized to measure trace amounts of PGE by increased probe current and counting time, yielding very low detection limits for this method (12 to 38 ppm). However, analytical error proved to be very high (over ~30%) in… Show more

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Cited by 4 publications
(2 citation statements)
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“…The eastern BC samples originate from borehole WV-30 drilled on the Winterveld property of Samancor's Eastern Chrome Mine. A thorough petrological and mineralogical overview of these samples, as well as their location relative to the eastern limb of the BC, is given in Kotzé and Gauert (2020). Figures 2a-d show typical mineral and textural characteristics of these samples.…”
Section: Samples and Methodsmentioning
confidence: 99%
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“…The eastern BC samples originate from borehole WV-30 drilled on the Winterveld property of Samancor's Eastern Chrome Mine. A thorough petrological and mineralogical overview of these samples, as well as their location relative to the eastern limb of the BC, is given in Kotzé and Gauert (2020). Figures 2a-d show typical mineral and textural characteristics of these samples.…”
Section: Samples and Methodsmentioning
confidence: 99%
“…Sample WV-65 is a massive, nearly monomineralic chromitite with variable grain size from the LG-6, which is mined for Cr at Winterveld. All of the samples from the eastern Bushveld used in this study represent a relatively unaltered, nearly pristine magmatic assemblage that is likely representative of equivalent rocks throughout the eastern and western limbs of the BC (Kotzé and Gauert, 2020). The most notable post-magmatic effects that were active with regard to these samples are those that occurred purely as a result of magmatic processes -for example, the scavenging of Fe from sulphide minerals by nonstochiometric chromite (FeCr₂O₄), leading to replacement of pyrrhotite by pyrite alongside sulphur loss from chromitite layers (Naldrett and Lehmann, 1988;Naldrett et al, 2012), resulting in mobilization of S in late-stage magmatic fluids, which produced limited features of high-temperature hydrothermalism (Figure 2d) (Kanitpanyacharoen and Boudreau, 2013;Kotzé and Gauert, 2020).…”
Section: Samples and Methodsmentioning
confidence: 99%