Metallogeny of the Brazilian Amazon
Rao, Bhaskara A.
published: Jan 1, 1989
ArtNo. ESP136000302004, Price: 19.00 €
The Amazon region of Brazil occupies an area of over 2 million sq. km and has an enormous mineral potential. The extent of this potential has been discovered in recent years as a consequence of gold and tin rushes. Also, the RADAM PROJECT stimulates geological activities in this poorly inhabited region, providing valuable information for geologic studies. The mineral potential of the Amazon region of Brazil surprises not only Brazil, but also the world, because of the fantastic discoveries of rich deposits. Among the principal ones belong: gold, tin ( Rondonia Province: 136000 t of Sn), iron (Serra dos Carajas: 17 Bt, 65 % Fe), manganese (Azul: 45 Mt, 45 % Mn), copper, and aluminum (Trombetas: 1.1 Bt, 49 % Al2O3); and mention may be made of niobium, rare earths, thorium, vanadium, tungsten; and diamonds, clays, evaporites and gas deposits. The nature of occurrence and their extraction problems are surpassed, often, due to their regional extension and large reserves. The main domains of some resistant minerals are the vast areas covered by placers (alluvial, coluvial, eluvial) which are mined or exploited by unconventional methods. The main areas of residual deposits, which are extensive, have sophisticated mining systems of operation. Several other deposits are still not evaluated and not yet mined. Thus far, the highest indices for exploration and exploitation are for gold, tin, aluminum and manganese ores, with slow but growing participation of iron ores and good prospects for copper.