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NAICS 21 is the category within the North American Industry Classification System which is composed of establishments that extract naturally occurring mineral solids(i.e. as metals, coal and other industrial minerals), liquid minerals (i.e. crude petroleum) and gases (i.e. natural gas).
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Working level (WL) is a historical unit of concentration of radioactive decay products of radon, applied to uranium mining environment. [1] One working level refers to the concentration of short-lived decay products of radon in equilibrium with 3,700 Bq/m 3 (100 pCi/L) in air. These decay products would emit 1.3 × 10 5 MeV in complete decay. [2]
The hammer and pick, two basic tools traditionally used in mining for breaking rock, together form a main heraldic symbol of mining and miners. It is also used to mark the location of mines on maps. In other locations, the pickaxe and shovel fill the same purpose. The following outline is provided as an overview of and topical guide to mining:
In-situ leach mining involves pumping of a lixiviant into the ore body via a borehole, which circulates through the porous rock dissolving the ore and is extracted via a second borehole. The lixiviant varies according to the ore deposit: for salt deposits the leachate can be fresh water into which salts can readily dissolve.
Underwater mining (1 C, 13 P) W. Water management in mining (3 C, 13 P) Pages in category "Mining techniques" The following 21 pages are in this category, out of 21 ...
In mining, the face is the surface where the mining work is advancing. In surface hi mining it is commonly called pit face , in underground mining a common term is mine face . Accordingly, face equipment is the mining equipment used immediately at the mine face used for removal and near-face transportation of the material: cutting machines ...
HNO 3 typically added at a very high molarity (1–5 M), depending on La concentration and amount. Another method is to add HCl to La, creating LaCl 3. HCl is added at 1 M to 5 M depending on La concentration. Solvent from La, Nd, and Pr separation is recycled to step 11. Nd is precipitated as an oxide product. Pr is precipitated as an oxide ...