Refs.:
Lombaard, A. F. and the Exploration Staff Of The Ookiep Copper Company Limited (1986): The copper deposits of the Okiep district, Namaqualand. In: Anhaeusser, C. R. and Maske, S. (Editors). Mineral Deposits of Southern Africa, Volume II, 1421-1445.
Cairncross, B. (2004): History of the Okiep Copper District, Namaqualand, Northern Cape Province, South Africa. Mineralogical Record 35, 289-317.
