names of lead mining machines

History of Lead mining in the Peak District and Derbyshire Lead mines were mentioned in Domesday and mining continued and expanded in Norman times. The importance of the industry can be judged by the fact that the miners petitioned Edward I to give proper legal standing to the rules governing the extraction of lead, which he did in 1288. Mining - Underground mining | Britannica Counting against underground mining are the costs, which, for each ton of material mined, are much higher underground than on the surface. There are a number of reasons for this, not the least of which is that the size of underground mining equipment—because of ground conditions, ore body geometry, and other factors—is much smaller than in the open pit. Safety and Health Topics | Toxic Metals | Occupational ... Toxic metals, including "heavy metals," are individual metals and metal compounds that negatively affect people's health. Some toxic, semi-metallic elements, including arsenic and selenium, are discussed in this page.    Read More