North African sources describe what some consider to be visits to the New World by a fleet from the Mali Empire in 1311, led by Abu Bakr II. According to the abstract of Columbus' log made by Bartolomé de las Casas, the purpose of Columbus' third voyage was to test both the claims of King John II of Portugal that "canoes had been found which set out from the coast of Guinea Africa and sailed to the west with merchandise" as well as the claims of the native inhabitants of the Caribbean island of Hispaniola that "from the south and the southeast had come black people whose spears were made of a metal called guanín...from which it was found that of 32 parts: 18 were gold, 6 were silver, and 8 copper."