They got to work removing toxic soils, managing contaminated discharge water, and plugging the old mine tunnel with concrete ... be half a million abandoned hard rock mines across the Western ...

Scientists in China have developed a machine that can boost the efficiency of excavating extremely hard ... mining, railways and highway projects. With the power of modern tunnel boring machines ...

By Lisa Friedman The Trump administration has opened thousands of acres of land in Nevada and New Mexico to oil and gas drilling, geothermal development and hard-rock mining, reversing protections ...