The Kalahari Manganese Field. The Adventure Continues By Prof. Bruce Cairncross & Nic Beukes. Mineral collectors and museum curators around the world acknowledge the Kalahari Manganese Field as one of the premier mineral-producing localities and certainly the most important one in the southern African region. Specimens from N’Chwaning and Wessels mines have been gracing the display cases of collections since the early 1960s when rhodochrosite was first collected at the Hotazel mine. For more than 60 years thousands of mineral specimens have been collected adding not only to the aesthetics of collections but also to the science on mineralogy. To order at our special price of R670 each