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A man engine is a mechanism of reciprocating ladders and stationary platforms installed in mines to assist the miners' journeys to and from the working levels. It was invented in Germany in the 19th century and was a prominent feature of tin and copper mines in Cornwall until the beginning of the twentieth century.
Slope mining is a method of accessing valuable geological material, such as coal or ore. A sloping access shaft travels downwards towards the desired material. Slope mines differ from shaft and drift mines, which access resources by tunneling straight down or horizontally, respectively. In slope mining, the primary access to the mine is on an ...
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 ...
Angle of repose of a heap of sand Sandpile from the Matemateca collection. The angle of repose, or critical angle of repose, [1] of a granular material is the steepest angle of descent or dip relative to the horizontal plane on which the material can be piled without slumping.
When designing the trommel screen, it should be taken into account that higher inclination angle would result in a higher production rate of particles. A higher inclination angle would result in a higher production rate due to an increase in particle velocity, , as illustrated in Figure 7. However, this is at a cost of a lower screening efficiency.
Drift mining is either the mining of an ore deposit by underground methods, or the working of coal seams accessed by adits driven into the surface outcrop of the coal bed. [1] A drift mine is an underground mine in which the entry or access is above water level and generally on the slope of a hill, driven horizontally into the ore seam. [2]
Although these terms are related, within the context of this section, the term measurement while drilling refers to directional-drilling measurements, e.g. for decision support for the wellbore path, (Inclination and Azimuth) while LWD refers to measurements concerning the geological formations penetrated while drilling. [1]
The new #4 shaft bottoms out at 2,840 m (9,320 ft) down. LaRonde mine expansion was completed in June 2016 at the depth of 3,008 m (9,869 ft), the deepest longhole open stopes in the world. [16] The deepest active mine in Eurasia and in Asia is Skalisty Mine of Nornickel, located in Talnakh. In September 2018 it reaches depth of 2,056 m (6,745 ...