Search results
Results from the WOW.Com Content Network
Overburden at a coal mining site In mining , overburden (also called waste or spoil ) is the material that lies above an area that lends itself to economical exploitation, such as the rock, soil, and ecosystem that lies above a coal seam or ore body.
Overburden pressure is a geology term that denotes the pressure caused by the weight of the overlying layers of material at a specific depth under the earth's surface. [1] Overburden pressure is also called lithostatic pressure , or vertical stress.
In surface mining, stripping ratio or strip ratio refers to the amount of waste (or overburden) that must be removed to release a given ore quantity. [1] [2] It is a number or ratio that express how much waste is mined per unit of ore. The units of a stripping ratio can vary between mine types.
Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface where the overburden is relatively thin. In contrast, deeper mineral deposits can be reached using underground mining. [2] Kittilä Gold Mine in Kittilä, Finland is the largest primary gold producer in Europe. [3] [4]
The Siilinjärvi carbonatite complex, [1] an open-pit mine owned by Yara International, in Siilinjärvi, Finland Coal strip mine in Wyoming. Surface mining, including strip mining, open-pit mining and mountaintop removal mining, is a broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed, in contrast to underground mining, in which the ...
Dr. Leana Wen, former Baltimore Health Commissioner, explains why she doesn’t think the U.S. has not gotten through the first wave of coronavirus and why she says a national testing strategy is ...
The Dow Jones Industrial Average dropped 748 points, or 1.7%, and the Nasdaq composite tumbled 2.2%. The preliminary report from S&P Global said activity unexpectedly shrank for U.S. services ...
Preconsolidation pressure is the maximum effective vertical overburden stress that a particular soil sample has sustained in the past. [1] This quantity is important in geotechnical engineering, particularly for finding the expected settlement of foundations and embankments.