Sir Richard Francis Burton 
To The Gold Coast for Gold A Personal Narrative Vol I & Vol II [EPUB ebook] 

(Excerpt): "Western Africa was the first field that supplied the precious metal to mediaeval Europe. The French claim to have imported it from Elmina as early as A.D. 1382. In 1442 Goncales Baldeza returned from his second voyage to the regions about Bojador, bringing with him the first gold. Presently a company was formed for the purpose of carrying on the gold-trade between Portugal and Africa. Its leading men were the navigators Lanzarote and Gilianez, and Prince Henry ‘the Navigator’ did not disdain to become a member. In 1471 Joao de Santarem and Pedro Escobar reached a place on the Gold Coast to which, from the abundance of gold found there, they gave the name of ‘Sao Jorje da Mina, ‘ the present Elmina. After this a flood of gold poured into the lap of Europe; and at last, cupidity having mastered terror of the Papal Bull, which assigned to Portugal an exclusive right to the Eastern Hemisphere, English, French, and Dutch adventurers hastened to share the spoils."