In 1469, King Afonso V of Portugal granted him the monopoly of trade in the Gulf of Guinea. Besides the payment of an annual rent of 200,000 reais, Gomes was to explore 100 leagues of the coast of Africa per year, for five years (later the agreement would be extended for another year). He also received a monopoly of trade in guinea pepper for another yearly payment of 100,000 reais. (Then called "malagueta", it was a popular substitute for black pepper.)
Gomes employed explorers João de Santarém, Pedro Escobar, Lopo Gonçalves, Fernão do Pó and Pedro de Sintra, He exceeded the requirements of his grant: his expeditions reached the Cape of Santa Catarina, already in the Southern Hemisphere, and also the islands of the Gulf of Guinea.
In 1471 they reached Elmina (meaning "the Mine"), where they found a thriving alluvial gold trade. With the substantial revenues he got, especially the trade of his warehouse in Mina, he become known as "Fernão Gomes da Mina" in 1474. With his profits from African trade, Fernão Gomes assisted the Portuguese king in the conquests of Asilah, Alcácer Ceguer, and Tangier in Morocco, where he was knighted. Later, in 1478, gathering honors and with an enormous influence on the economy of the kingdom, he was appointed to the royal council.
Gomes married Catarina Leme, an illegitimate child of the Flemish-Portuguese merchant Martim Leme. Martin Leme was the son of Martin Lems and his noble Portuguese wife Joana Barroso. They had two children. Catarina Leme married João Rodrigues Pais. Nuno Fernandes da Mina married Isabel Queimado and Violante de Brito.
- Thorn, Rob. "Discoveries After Prince Henry". Retrieved 2006-12-24. Cite error: Invalid
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- Semedo, J, de Matos. "O Contrato de Fernão Gomes" (in Portuguese). Retrieved 2006-12-24.[dead link]
- "Elmina Castle". Government of Ghana. Archived from the original on 2006-10-09. Retrieved 2006-12-24.
- Luiz Gonzaga da Silva Leme, Genealogia Paulistana, Volume II, p. 179
- http://www.geneall.net/P/per_page.php?id=130326 Fernão Gomes in a Portuguese Genealogical site
- History of the Portuguese Expansion, the Formation of the Empire (1415-1570)
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