He was German until his naturalisation in South West Africa.
[2] He visited the Tsumeb mine from December 1938 until March 1939 and from February 1940 until March 1940 as a consultant for the Otavi Mining Company.
[3] The mineral Kegelite, discovered in the Tsumeb mine, was named after him by American volcanologist David Richardson.
[4][5] Kegel took the first published photograph of the Hoba meteorite.
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