The Occurrence and Gemological Properties of Wessels …
Regional Geology of the Kalahari Manganese Field. At the Wessels mine, the manganese ore occurs in a stratiform orebody (for further information, see Roy, 1976, and Hutchinson, 1983). Such stratiform manganese deposits are found in India, Brazil, Ghana, and the Soviet Union, but the ones in South Africa are among the largest and economically ...Web
قرأ أكثر![](/images/whatsappp.png)