What did Salmita Mine and Outpost Island Mine both mine for
Outpost Island Mine The Outpost Island Mine was a gold and tungsten producer 94 kilometres southeast of Yellowknife, Northwest Territories on an island of Great Slave Lake. Gold was discovered here in 1935 by prospectors, and some development was undertaken in 1936-1938. Tungsten ores became valuable during World War II, so the owners (Slave Lake Gold Mines Limited) investigated the tungsten possibilities of the mine. It produced small amounts of gold, copper, and tungsten during 1941-1942, and then again in 1951-1952 during the Korean War. It was a small deposit and was not considered economic because of unpredictable tungsten market prices in the 1950s.
Cerro Rico Cerro Rico (Spanish for "rich mountain"), Cerro Potosí ("Potosí mountain") or Sumaq Urqu (Quechua "sumaq" beautiful, good, pleasant, "urqu" mountain, "beautiful (good or pleasant) mountain") is a mountain in the Andes near the Bolivian city of Potosí. Cerro Rico was famous for providing vast quantities of silver for Spain during the period of the New World Spanish Empire. The mountain, which is popularly conceived of as being "made of" silver ore, caused the city of Potosí to become one of the largest cities in the New World. After 1800, the silver mines were depleted, making tin the main product. This eventually led to a slow economic decline. Nevertheless, the mountain continues to be mined for silver to this day. Due to poor worker conditions, such as a lack of protective equipment against the constant inhalation of dust, many of the miners contract silicosis and have a life expectancy of around 40 years. The mountain is still a significant contributor to the city's economy, employing some 15,000 miners.