2020-8-25 · The first section gives an overview of underg round mining methods and practices as used commonly in underground mines, including classification of underground mining methods and brief explanations of the techniques of room-and-pillar mining, sublevel stoping, cut-and-fill, longwall mining, sublevel caving, and block caving. The second
mining - mining - Prospecting and exploration: Various techniques are used in the search for a mineral deposit, an activity called prospecting. Once a discovery has been made, the property containing a deposit, called the prospect, is explored to determine some of the more important characteristics of the deposit. Among these are its size, shape, orientation in space, and location with respect ...
2021-8-28 · Let us understand every data mining methods one by one. 1. Association. It is used to find a correlation between two or more items by identifying the hidden pattern in the data set and hence also called relation analysis. This method is used in market basket analysis to …
MINING Engineering Interview Questions with Answers pdf Download :-. 1. Which cut is used for solid blasting in Indian coal Mines. Wedge cut. 2. Permitted explosives are safe to use because. Special chemical are used to extinguish the spark produced during …
On January 1, of 20X1, Oriole Corp. purchased equipment for $160,000. The equipment has a useful life of 8 years with no residual value. In Years X1 through X2, Oriole used the double-declining-balance method of depreciation. At the start of 20X3, Oriole changes to the straight-line method of depreciation.
2017-3-16 · Longitudinal Back, Flat-Back Mining Method Long-Wall StopingmMining Method. After starting an overhand stope the shape in which the back is carried is often of prime importance. In A, Fig. 2, is illustrated the method of carrying a flat or longitudinal back (the term long-wall is used sometimes when the vein lies nearly flat).
2019-6-26 · Glossary of Mining Terminology After Damp - Gasses resulting from underground combustion, normally carbon monoxide. This is a loose term implying any fatal gas in a mine after an explosion or fire. Air Shaft - A vertical opening into a mine for the passage of air. Airway - Any passage in a mine along which an air current moves. Some passages are
2020-4-24 · 1. Percussion or Cable Drilling. Percussion drilling is one of the most original drilling methods used around the world. It requires the team to set up a tripod with a cable and the drill bit attached to its end. The drill goes to and fro in the hole to loosen the soil and reach a greater depth, which the workers later extract using a bailer.
2016-2-29 · Seismic Method. Surface seismic techniques used in gold exploration are restricted to seismic refraction and seismic reflection methods. Probably, the first one is the most employed. The equipment employed for both techniques is very similar and …
longwall mining Mining. a mining method in which very long rectangular blocks of coal are defined during the development stage of the mine and then extracted in a single continuous operation by an automated cutting head moving parallel to the coal face.When the coal is cut, the working area is protected by a movable, powered roof support system. As the face progresses, the immediate roof above ...
2019-6-28 · Tributary Area Method and Stresses of Pillar Design ... The deformation is measured as a function of load reduction resulting in a characteristic load-line, in which the slope is the local mine stiffness. The post-peak stiffness of the pillar can be compared to that of the mine. ... Post pillars are used in cut-and-fill mining …
2004-4-5 · subsurface may not be prohibitive. Reflection seismic methods provide fine structural detail and refraction methods provide precise estimates of depth to lithologies of differing acoustic impedance. The refraction method has been used in mineral investigations to map low-velocity alluvial deposits such as those that may contain gold, tin, or sand
Straight-line depreciation Straight Line Depreciation Straight line depreciation is the most commonly used and easiest method for allocating depreciation of an asset. With the straight line is a very common, and the simplest, method of calculating depreciation expense. In straight-line depreciation…
2021-3-7 · Beginner''s Guide to Ethereum mining. By: Steven Hay | Last updated: 3/7/21. Important update: For our readers who are looking to make a profit with crypto, we recommend looking into Ethereum staking as an alternative for mining. Ethereum mining is no longer recommended; Ethereum is expected to fully move into a PoS algorithm in 2022, which will render mining obsolete.
Bucket line dredges were used extensively throughout the early mining days. They were huge floating devices that could dig up massive amounts of gravel to extract gold. Although devastating to the riparian environments, their size allowed for huge gold recoveries. Although no longer in use, remnants of old bucket line dredges can be seen in many of the historic mining …
Open-pit is one of the most common mining methods used and starts from the earth''s surface, maintaining exposure to the surface throughout the extraction period. The excavation usually has stepped sides to ensure the safety of the miners and a wide …
The patent will be used for five years, even though its legal life is 20 years. Rocky Corporation has made a commitment to purchase the patent from Granite for $200,000 at the end of five years. Compute Granite''s patent amortization for 2021, assuming the straight-line method is used. A) $380,000. B) $400,000. C) $760,000. D) $800,000.
2018-12-13 · It is the most common drilling technique used for mining exploration, particularly in South America and Australia. RC drilling is a form of percussion drilling, by which the rock is made to fail through the use of a piston that delivers rapid impacts to …
2013-9-4 · Airborne Geophysical Methods. Digital Elevation Model of Mt. Ranier, USA shown in shaded relief. There are a number of airborne geophysical methods used within the minerals exploration industry. Some of the most commonly used ones are …
The straight-line method is used and useful life is estimated to be 10 years, with a $40,000 salvage value. At the beginning of 2007 Klein spent $96,000 to overhaul the machinery. After the overhaul, Klein estimated that the useful life would be extended 4 years (14 years total), and the salvage value would be …
2014-8-28 · Mining is the process of excavating a material which is naturally occurring from the earth to get profit. Underground method is used when ore body is thin or narrow and extends much below surface (Newman et al., 2010). In underground mining, development required to reach
It is used to transport natural gas to homes and businesses. The size of distribution pipes ranges from 12.7 mm to 152.4 mm. 12. Collection Pipeline. Collection pipelines carry oil or gas products from the wells in the ground to the oil batteries or natural gas processing center. Their diameter varies from 101 mm to 304 mm. Based on Method …
Kramer defines microtunnelling as ''those methods that install pipes with a diameter of less than 36 inches (900mm) to a predetermined line and level by remotely controlling the cutting head.''(Kramer et al. 1992) 10- Mined tunnel. Can be used where a self-supporting …
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