Before March 1957 Ghana was called the Gold Coast. The Portuguese who came to Ghana in the 15th Century found so much gold between the rivers Ankobra and the Volta that they named the place Mina – meaning Mine. The Gold Coast was later adopted to by the English colonisers. Similarily, the French, equally impressed by the trinkets worn by the coastal people, named The Ivory Coast, Cote d’Ivoire.

Source: https://www.ghanaweb.com/GhanaHomePage/history/