Indeed, not a whole emerald mine, the same source:
We located reporting from as far back as 2009 and 2014 that said when Elon Musk (“Elon” hereafter) was a child in South Africa in the 1980s, his father (“Errol” hereafter) at some point owned “a stake in an emerald mine” near Lake Tanganyika in Zambia, not South Africa.
South African diamond miner being x-rayed at the end of his shift to prevent theft, 1954 (lemmy.world)