Giant Gold Machines Gold Dredges. Early in the Gold Rush, miners used shovels and other simple tools to scoop up river easy gold was soon picked clean. The challenge took on new proportions: millions of tons of earth had to be dug up and sifted.
Jan 21, 2015· Take, for example, the case of Cortez Mine in Nevada, one of the biggest gold mines in the Owned by Canada’s Barrick Gold, it produced million ounces of gold in 2013. With gold averaging 1,400 an ounce that year, that’s a value of more than billion. It paid nothing in royalties to the federal government.