mining in Jowai and Cherapunjee is done by family member in the form of a long narrow tunnel, known as 'Rat hole' mining. (iv) Certain minerals may occur as alluvial deposits in sands of valley floors and the base of hills. These deposits are called 'placer deposits' and generally contain minerals, which ar e not corr oded by water .
Apr 07, 2017· Strip mining (or surface mining) is performed when surface soil and rock are stripped off to reach the mineral of concern. When such operations are done, surface water bodies (lakes, streams, etc) gets acidity. Acid mine drainage occurs when water molecules infiltrates the spoil banks. The water reacts with sulfide minerals to produce sulfuric acid.
what is the difference between an open pit mine, a quarry and an underground mine with shafts?please give the answer as soon as possible and give your answer . » More detailed difference betweenopen pit mine, quarry, underground mine with shafts .
The Mine Safety and Health Administration (MSHA), Department of Labor, and the Occupational Safety and Health Administration (OSHA), Department of Labor, have entered into this agreement to delineate certain areas of authority, set forth factors regarding determinations relating to ...
Aug 22, 2017· There's an obvious distinction between open pit mines and underground mines that leads to the main differences from the miners' perspectives. Open pit mines allow for heavy machinery and workers to do their jobs in the open and usually with more maneuverability.
Table 1: Classification of surface mining methods Placer Mining Openpit Glory hole Panning and sluicing Singlebench ***** Hydraulicking Multiplebench ***** Dredging Strip mining ***** ***** Quarry mining ***** UNDERGROUND MINING METHODS If the depth of an ore deposit is such that removal of overburden makes surface mining unprofitable, underground methods should be considered.
Dec 03, 2009· Underground mining is exactly that underground, using tunnels and/or shafts. High value minerals like gold, copper, uranium, and diamonds are mined in underground mines. If you are in an underground mine you can't see the sky. In general, underground mines have a much lower environmental impact than strip mines or other open pit mines.
Quarries are mines that are used to mine a deposit that lies at the earth's surface less difficulty or like limestone,gypsum are extracted like this. Underground mines are used when minerals are deep beneath the earth's surface,a vertical opening in an underground mine is .
Open pit mining. Quarry. Underground mining with shaft. Done for those minerals which lie close to the surface of the earth. Used for mining minerals at shallow depths. Minerals which lie at great depths below the surface of the earth. Used where commercially useful minerals are found near the surface.
What is the difference between opencast underground mining? Mining is something quite extraordinary. When we think of mining we think dusty, dark, unflattering settings. ... than shaft mining ... Have you ever wondered what extraordinary materials are extracted from the open pit mining? Here are a few: • Coal – used for electricity ...
Underground Mining. Underground Mining is generally used for areas where the mineral seam is too far underground for open cut mining to be of use. A tunnel, called a decline, is created to allow workers and machinery to reach the location of the minerals. Stope mining is used for most hard rock mining of minerals such as copper, silver, lead and zinc.
The Moss Mine is an open pit goldsilver operation, with a favorable strip ratio of waste to ore and minimal haul distances to the crushing plant. Metallurgical testwork to date, along with the completion of the pilot plant operations in 2014 and current production validates that the Moss orebody is amenable to gold and silver heap
Underground mining. When any ore body lies a considerable distance below the surface, the amount of waste that has to be removed in order to uncover the ore through surface mining becomes prohibitive, and underground techniques must be considered. Counting against underground mining are the costs, which, for each ton of material mined,...
Feb 23, 2009· When mining is done in d form of long narrow cannal it is called rat hole mining it is mstly done by family members . It is practised in JOwai cheerapunjee in India
Quarries Courses and Live Webcasts. Online courses, short courses and live webcasts about Quarries for mining and geoscience from Edumine.
Mar 13, 2018· The Advantages of Open Pit Mining. Pit mining is more cost effective than shaft mining because more ore can be extracted and more quickly. The working conditions are safer for the miners because there is no risk of cave in or toxic gas. Open pit mining is the preferred method for mining gold, silver, and uranium. This type of mining is also used to dig for coal and building stone.
Surface mining. Openpit mining often (but not always) results in a large hole, or pit, being formed in the process of extracting a mineral. It can also result in a portion of a hilltop being removed. In strip mining a long, narrow strip of mineral is uncovered by a dragline, large shovel, or similar type of excavator.
Surface mining. Strip mining is sensible when the ore body is near the surface. The practice includes some of the largest machines on earth, removing long strips of overlying soil and rock and then removing coal deposits. Openpit mining utilizes blasting and mineral removing, digger deeper into the earth causing a craterlike result.
The Melancthon mega quarry is an open pit mine, dug in the ground north of Orangeville, Ontario.
Feb 23, 2018· General Process. In most underground mining methods, deep vertical tunnels called shafts are drilled into the ground, along with a set of horizontal tunnels called drifts from the shaft bottom to access the ore. Then, longwall and continuous miners break up the ore deposit, which is transported back to the surface by conveyors.
Underground mining is used to extract ore from below the surface of the earth safely, economically and with as little waste as possible. The entry from the surface to an underground mine may be through a horizontal or vertical tunnel, known as an adit, shaft or decline. Underground mining is practical when: The ore body is too deep to mine profitably by open pit.
Quarry. A quarry is a place from which dimension stone, rock, construction aggregate, riprap, sand, gravel, or slate has been excavated from the ground. A quarry is the same thing as an openpit mine from which minerals are extracted. The only nontrivial difference between the two is that openpit mines that produce building...
Feb 23, 2009· Answers. Best Answer: Mining done in the form of a long narrow tunnel is rat hole mining. When mining is done in d form of long narrow cannal it is called rat hole mining it .
The threecompartment shaft is the conventional choice for an initial entry. In some applications, timber sets have been replaced with steel. Steel is lighter to transport but less adaptable for installing catch pits and water rings. Steel sets are not recommended unless the sets must be shipped to the site by air.