Ore is extracted from the earth through mining and treated or refined, often via smelting, to extract the valuable metals or minerals. The grade of ore refers to the
The most common underground method of ore extraction is cut-and-fill stoping, in which tunnels are dug to moderate depths, branching away from the mine portals
IMPORTANT ORE MINERALS. Most elements need to be concentrated into amounts that can be economically mined from ore deposits usually hundreds to
The great majority of zinc deposits contain the lead mineral, galena, and both the lead and zinc minerals are mined together. Other metals that are found with
Most of the ore thus far mined has come from the immense body in Carbonate Hill, which extends through the claims controlled by the Western Mining Co. and a
Zinc is the 23rd most abundant element in the earth& 39;s crust. Sphalerite, zinc sulfide, is and has been the principal ore mineral in the world.
May 7, 2011 When miners find rock containing mineral ore, they first extract the rock from the earth. This can be a huge process, sometimes displacing millions