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Gold ProspectingGold prospectors in Australia panning water and silt in search of small nuggets of the precious metal. (Photo by Three Lions/Getty Images)
Coal Workerscirca 1930: A group of coal workers in the West Indies, using baskets to carry the coal. (Photo by Hulton Archive/Getty Images)
Indiana Coal MineApril 1938: The interior of a coal mine in the American state of Indiana. (Photo by Ferdinand S. Hirsh/Fox Photos/Getty Images)
Minerscirca 1930: Miners bring out coal out from a small privately owned mine in the Forest of Dean. (Photo by Fox Photos/Getty Images)
Miners By Sasha1930: Using his newly developed Sashalight, photographer Sasha has taken this picture of coal miners in the emergency cage
Local Bankcirca 1930: Panning for gold in the Rio Das Velhas (River of the old women), Marianna Brazil which has produced gold since 1730. (Photo by General Photographic Agency/Getty Images)
Coal Minerscirca 1930: A group of coal miners emerge from the pit shaft into daylight. (Photo by General Photographic Agency/Getty Images)
German Minecirca 1930: Workers at a German coal mine. (Photo by General Photographic Agency/Getty Images)
Gold Miningcirca 1900: Gold panners sifting at the riverside. (Photo by Keystone/Getty Images)
Masked MinersDecember 1925: Three workers demonstrating the different types of gas masks used in mine rescue work. (Photo by Fox Photos/Getty Images)
Volunteer BirdDecember 1925: A canary in a glass fronted box is being used to test the toxicity of gas inhaled by a mine rescue worker. (Photo by Fox Photos/Getty Images)
Diamond Mine1872: A diamond mine in South Africa. (Photo by Edward Gooch/Edward Gooch/Getty Images)
Tailings Ponds