An ore is an occurrence of rock or sediment that contains sufficient minerals with economically important elements, typically metals, that can be economically extracted from the deposit. The ores are extracted from the earth through mining; they are then refined (often via smelting) to extract the valuable element, or elements The ore grade, or concentration of an ore mineral or metal, as
Tantalum is a chemical element with symbol Ta and atomic number 73. Previously known as tantalium, its name comes from Tantalus, a villain from Greek mythology. Tantalum is a rare, hard, blue gray, lustrous transition metal that is highly corrosion resistant. It is part of the refractory metals group, which are widely used as minor components in alloys. The chemical inertness of tantalum makes
Naturally Occurring Radioactive Materials NORM World
Naturally Occurring Radioactive material, natural materials contain radioactive elements (radionuclides), known as NORM. The earth's crust is radioactive. Information from the World Nuclear Association, the global private sector organization that seeks toprovide information on nuclear power, nuclear energy, Chernobyl, uranium, nuclear waste management.