Mineral industry of Africa in 2005 from 16.1% in 2004. In 2005, the principal mineral targets in Africa were copper, diamond, gold, and platinum group metals (PGM). African countries that experienced the highest levels of exploration activity in 2005 were, in descending order based on the number of exploration sites as compiled by the USGS, South Africa, Burkina Faso, Ghana, and Zambia, but activity took place in a number of other countries. Gold accounted for approximately 51% of reported African exploration projects, diamond accounted for about 14%, copper and PGM each accounted for about 11%, and nickel accounted for 5%. Early stage projects accounted
Sikorsky S-39 Sikorsky S-39 The Sikorsky S-39 was an American light amphibious aircraft produced by Sikorsky Aircraft during the early 1930s. The S-39 was a smaller, single-engine version of the S-38. Filmmakers Martin and Osa Johnson used a giraffe-patterned S-39 "Spirit of Africa", with companion zebra-striped S-38 "Osa's Ark", to explore Africa extensively, making safari movies and books. One example of the S-39 was acquired by the United States Army Air Corps in 1932, given the designation Y1C-28. It was evaluated for use in coastal patrol and light transport roles; in 1934 it was redesignated C-28 and assigned as a liaison aircraft