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The phrase a, or the, canary in a, or the, (coal) mine denotes an early indicator of potential danger or failure.. It refers to the former practice of taking live canaries into coal mines to test for the presence of toxic gases, particularly carbon monoxide, the illness or death of the canaries serving as an indication that such gases were present.. The earliest mention of this practice that I ...
Jul 07, 2020· Coal mining, extraction of coal deposits from the surface of Earth from underground. Coal has been used since the Bronze Age, 3,000 to 4,000 years ago, and was the basic energy source that fueled the Industrial Revolution of the 18th and 19th centuries.
This is a partial glossary of coal mining terminology commonly used in the coalfields of the United Kingdom. Some words were in use throughout the coalfields, some are historic and some are local to the different British coalfields. A. Adit. An adit is an underground level or tunnel to the surface for access or drainage purposes. ...
Define coal mine. coal mine synonyms, coal mine pronunciation, coal mine translation, English dictionary definition of coal mine. Noun 1. coal mine a mine where coal is dug from the ground coalpit colliery, pit a workplace consisting of a coal mine plus all the buildings and...
Mar 29, 2019· The definition of a coal miner isn''t just simply someone who mines for coal underground. There are a variety of jobs that come with it. What makes it a mining job is when the employee is working at a coal mine and whose job works towards getting coal out of the ground and distributed for energy usage.
EPA promulgated the Coal Mining Effluent Guidelines and Standards (40 CFR Part 434) in 1975, and amended the regulation in 1976, 1977, 1979, 1982, 1985 and regulation covers wastewater discharges from mine drainage, coal storage facilities, and coal preparation plants.
Coal mining Coal mining Choosing a mining method: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam .
Mining definition, the act, process, or industry of extracting ores, coal, etc., from mines. See more.
Underground coal mining is the extraction of coal from below the surface of the earth. The coal is worked through tunnels, passages, and openings that are connected to the surface for the purpose of the removal of the coal. Mechanical equipment breaks the coal to a size suitable for haulage.
Aug 04, 2020· Coal definition: Coal is a hard black substance that is extracted from the ground and burned as fuel. | Meaning, pronunciation, translations and examples
What is the definition of coal mining? What is the meaning of coal mining? How do you use coal mining in a sentence? What are synonyms for coal mining?
coal mining definition: 1. the business, job, or process of removing coal from the ground: 2. the business, job, or.. Learn more.
Coal seam definition is a bed of coal usually thick enough to be profitably mined.
Definition of coal mining in the dictionary. Meaning of coal mining. Information and translations of coal mining in the most comprehensive dictionary definitions .
Definition of canary in a coal mine in the Idioms Dictionary. canary in a coal mine phrase. What does canary in a coal mine expression mean? Definitions by the largest Idiom Dictionary.
Reclamation processes. As part of the life cycle of a surface coal mine, completed mine areas must undergo mining ends, operators must restore the land to its approximate original contour (AOC) or leave the land graded and suitable for a "higher and better" postmining land use (PMLU) that has been approved as part of the original mining permit .
coal mining meaning: the business, job, or process of removing coal from the ground: . Learn more.
A. Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ead of the face and the back abutment, that is, the settled packs .
coal mine definition: 1. the deep hole or system of holes under the ground from which coal is removed 2. the deep hole or.. Learn more.
Dec 30, 2016· How West ia Coal Mining Helped Shaped Labor History On this day in 1986, a mining tradition dating back to 1911 ended: the use of canaries in coal mines to .
Coal definition, a black or darkbrown combustible mineral substance consisting of carbonized vegetable matter, used as a fuel. See more.
Aug 02, 2020· Coal mining definition: the act, process, or industry of extracting coal from the earth | Meaning, pronunciation, translations and examples
Jul 24, 2020· "Canary in a coal mine" refers to an early safety measure taken by coal miners. Today, the practice of using a to test the air supply has become part of coal mining lore, but the ideology behind it has become a popular expression.
Coal mine definition, a mine or pit from which coal is obtained. See more.
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