Fill - Any material that is put back in Adit mining of the extracted ore to provide ground support. Identified coal resources are classified as demonstrated and inferred.
Wire ropes are made from medium carbon steels. Barrier - Something that bars or keeps out. Rider - A thin seam of coal overlying a thicker one. Pinch — A compression of the Adit mining and floor of a coal seam so as to "squeeze" out the coal.
Self-contained breathing apparatus - A self-contained supply of oxygen used during rescue work from coal mine fires and explosions; same as SCSR self-contained Adit mining rescuer. All mine workings below both the drainage adit "below adit" and the water table will flood unless mechanical means are used for drainage.
It is a small canister with a Adit mining directly attached to it. Hoist - A drum on which hoisting rope is wound in the engine house, as the cage or skip is raised in the hoisting shaft.
Portal - The structure surrounding the immediate Adit mining to a mine; the mouth of an adit or tunnel. Heaving - Applied to the rising of the bottom after removal of the coal; a sharp rise in the floor is called a "hogsback".
The precursors or chemical forerunners of acid rain formation result from both natural sources, such as volcanoes and decaying vegetation, and man-made sources, primarily emissions of sulfur and nitrogen oxides resulting from fossil fuel combustion.
Acid deposition or acid rain — Refers loosely to a mixture of wet and dry "deposition" deposited material from the atmosphere containing higher than "normal" amount of nitric and sulfuric acids.
Joint - A divisional plane or surface that divides a rock and along which there has been no visible movement parallel to the plane or surface.
Access and ventilation[ edit ] Horse adit in the abandoned lead mine, NentheadCounty Durham, UK Access to a mine by adit has many advantages over the vertical access shafts used in shaft mining.
Respirable dust sample - A sample collected with an approved coal mine dust sampler unit attached to a miner, or so positioned as to measure the concentration of respirable dust to which the miner is exposed, and operated continuously over an entire work shift of such miner.
Not precise, but very useful for determining the commercial value. I Inby - In the direction of the working face.
Among the various types of crushers are the ball mill, gyratory crusher, Handsel mill, hammer mill, jaw crusher, rod mill, rolls, stamp mill, and tube mill. Gathering conveyor; gathering belt - Any conveyor Adit mining is used to gather coal from other conveyors and deliver it either into mine cars or onto another conveyor.
Friable - Easy to break, or Adit mining naturally. Pinning - Roof bolting. Overburden is removed prior to surface mining and replaced after the coal is taken from the seam. Gold was usually found on top of "false bedrock," a layer of clay that occurred at the base of the beach or stream deposit.
Area of an airway - Average width multiplied by average height of airway, expressed in square feet. Width - The thickness of a lode measured at right angles to the dip.
Headframes are the framework upon which the hoist system depends to haul men and materials in an out of a mine shaft Hoist — The equipment that lowers and raises everything up and down the shaft.
Around the population of Nome was more than twenty thousand, many of them drift miners. Fractures include faults, shears, joints, and planes of fracture cleavage. Many miners tunneled into deep placer deposits, bringing out the high-grade gravels to be washed at the spring thaw.
Historical US drift mining gold [ edit ] Alaska[ edit ] Drift mining methods were used extensively to mine placer deposits during the early years of the Nome mining district. Demonstrated resources are further broken down as measured and indicated.
Applied to a rock, soil, or fossil when occurring in the situation in which it was originally formed or deposited. Fault zone - A fault, instead of being a single clean fracture, may be a zone hundreds or thousands of feet wide.
Too small for commercial operation, the mine probably provided coal for the Lusk family and later for the park. Such pressures may be great enough to cause rocks having a low compressional strength to deform and be squeezed into and close a borehole or other underground opening not adequately strengthened by an artificial support, such as casing or timber.
A mine winze is a vertical shaft that starts and terminates underground. Less energy is required to transport miners and heavy equipment into and out of the mine. U Ultimate analysis - Precise determination, by chemical means, of the elements and compounds in coal.
California[ edit ] Gold has been mined from placer gold deposits up and down the state and in different types of environment.
InJudge Lorenzo Sawyer issued a decree prohibiting the dumping of hydraulic mining debris into the Sacramento Rivereffectively eliminating large-scale hydraulic operations. Cleat - The vertical cleavage of coal seams.
Competent rock - Rock which, because of its physical and geological characteristics, is capable of sustaining openings without any structural support except pillars and walls left during mining stalls, light props, and roof bolts are not considered structural support.An adit is a horizontal or nearly horizontal tunnel for working or draining a mine, and can also be called a drift or a sough – depending on where you are in the country.
Glossary of Mining Terms Adit - A nearly horizontal passage from the surface by which a mine is entered and dewatered.
A blind horizontal opening into a mountain, with only one entrance. Adit mining - Mining in the same direction, or order of sequence; first mining as distinguished from retreat. Adit: Adit, a horizontal or near-horizontal passage driven from the Earth’s surface into the side of a ridge or mountain for the purpose of working, ventilating, or removing water from a mine.
Where either a vertical shaft or an adit can be used to reach a mineral deposit, the generally lower cost of. Underground mining terms most commonly used: Adit – A level, horizontal drift or passage from the surface into a mine. Collar – The point at which a shaft intersects the surface or underground haulage level.
Adit Resources Corp. (“Adit”) was incorporated on June 29, under the laws of the State of Nevada. The principal business of Adit is the acquisition, exploration, development, and economic mining of high-quality precious metals and mineral projects within North America.
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.
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.Download