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New constraints on the age of ore at Black Mountain mine, Bushmanland Ore District, South Africa; Cornell, D; Moses, A;
Cawood, T; Richter, M. South African Journal of Geology vol. 125, issue 3-4, 2022 p. 337-344,
https://doi.org/10.25131/sajg.125.0024 (NRCan Cont.# 20220513)