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When the ore body is more or less horizontal, various forms of room and pillar stoping, cut and fill, [4] or longwall mining can take place. In steeply-dipping ore bodies, such as lodes of tin, the stopes become long narrow near-vertical spaces, which, if one reaches the surface is known as a gunnis or goffen. [1] A common method of mining such ...
A drum hoist (steel wire rope visible) and motor. In underground mining a hoist or winder [1] is used to raise and lower conveyances within the mine shaft.Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (), although modern large hoists use alternating current drives that ...
Jig concentrators are devices used mainly in the mining industry for mineral processing, to separate particles within the ore body, based on their specific gravity (relative density). [1] The particles would usually be of a similar size, often crushed and screened prior to being fed over the jig bed. There are many variations in design; however ...
A spoil tip is a pile built of accumulated spoil - the overburden or other waste rock removed during coal and ore mining. Squeeze. A squeeze, weight or pinching was settling of the strata over a worked out area, resulting in lowering of the roof. Stinkdamp. Sulphuretted hydrogen gas, lethal following brief exposure. [6] Surveyor
As the cam moves from under the stamp, the stamp falls onto the ore below, crushing the rock, and the lifting process is repeated at the next pass of the cam. Each one frame and stamp set is sometimes called a "battery" or, confusingly, a "stamp" and mills are sometimes categorised by how many stamps they have, i.e. a "10 stamp mill" has 10 sets.
Similar to in situ mining, heap leach mining differs in that it places ore on a liner, then adds the chemicals via drip systems to the ore, whereas in situ mining lacks these liners and pulls pregnant solution up to obtain the minerals. Heap leaching is widely used in modern large-scale mining operations as it produces the desired concentrates ...
Leaching is a process widely used in extractive metallurgy where ore is treated with chemicals to convert the valuable metals within the ore, into soluble salts while the impurity remains insoluble. These can then be washed out and processed to give the pure metal; the materials left over are commonly known as tailings.
However, Edison's iron was competing with the rich iron ore of the Iron Range and sales were not sufficient to bring in a profit and the operation was closed down after just a few years. [2] [3] Edison operated an iron mine in the Franklin-Sterling Hill Mining District [4] near Ogdensburg, New Jersey under the New Jersey and Pennsylvania ...