The Virden, Illinois, Coal Mine Massacre on October 12, 1898

 · For miners and loaders (unskilled workers who only shoveled coal and did not do skilled undercutting with a pick), by far the most common cause of injury and death was bad top or a collapsing mine roof. In 1899, for instance, Frank Stroff arrived for work at a Madison County coal mine and worked for only twenty minutes when a gigantic piece of slate fell directly on him, instantly crushing the ...

Get Price

Gold Wedge Mine In British Columbia, Canada

Mine Overview. The Gold Wedge Mine is in British Columbia, Canada. The Gold Wedge Mine is a underground mining operation. Initial production took place in 1988. Site identifiion and general characteristics. Learn about USGS mines. Gold Primary Commodity. Silver Secondary Commodity.

Get Price

Wedges and Barrels, Prestressing Wedges Barrels ...

wedges and barrels for modern construction: pretension or posttension for concrete constructions as building materials: bridge construction: railway and highway construction: buildings and channel construction: steel rope wire bridges: wedges barrels are used in Coal mines etc.

Get Price

Mechanism of Support Optimization and Confined Blasting of Thick and Hard Rock with a Wedge ...

Geological Conditions. The target coal mine (Zhuxianzhuang Mine) is loed in Anhui province, China. Currently, 8# coal seam, with an average thickness of, is being mined at depths of 500m with the long wall fully mechanized top coal caving technology. The overlying strata in the northwing mine area are composed of hard roofs, with conglomerate as the main ingredient. As shown ...

Get Price

Guidance on the selection, installation, maintenance and ...

Mr A Bilton Federation of Independent Mines Mr J Browett UK Coal Mining Ltd Mr C Clegg Bridon Ropes Ltd Mr L Hilton Scottish Coal Ltd Mr SJ Mills British Gypsum Ltd Mr R Letham National Association of Colliery Overmen, Deputies and Shotfirers Mr R Young British Association of Colliery Management Mr A Walker Tower Mine Mr A Dobbs Union of Democratic Mineworkers . Deep Mined Coal .

Get Price

Task Geotechnical factors affecting high and lowwall ...

Since dolomite is not a common basement lithology at most opencast coal mines in South Africa, it is necessary to conduct similar geotechnical investigations at other sites where the basement is dissimilar to that of New Vaal Colliery in order to identify other possible causes for high and lowwall instability. To this end, a series of investigations were conducted at 's Wonderwater ...

Get Price

Mine Machines, Coal Cutting

used in small mines until the 1950s. The earliest coal cutting machines used a spinning disk, or a cutting arm like a chainsaw, to cut a slice from the softest part of the seam, often at the bottom, freeing up the coal to fall naturally, be cut down by hand picks, or brought down by wedges or even explosives. Later cutting machi nes were designed to cut all the seam, so there was no need for ...

Get Price

Minerals | Free FullText | Cutting Resistance Laboratory ...

Coal mining working conditions at certain depths were simulated by a gradual increase of the confining pressure during the test. According to depths at which coal mining is performed during the testing, confining pressures of σ 3 = 0, 250, 300, 350, 400, 450, 500, 550, and 600 kPa were applied.

Get Price

Durham Mining Museum

In the operation of coal getting, picks are used for undercutting or holing, the coal being afterwards detached by wedges or by blasting. The coal is then ready for filling into the tubs. Thus the complete equipment of the working miner consists of a few picks, a wedge or two, a hammer and a shovel, with a boring machine and the necessary drills and tools for charging and tamping the shot hole ...

Get Price

Blasting in Underground Coal Mines

Blasting in Coal Mines •Modern mechanised coal mines use machines and longwall mining methods to cut solid coal and convey the broken coal out of underground workings. •Continuous mining equipment has escalated coal production and introduced more effective and efficient coal handling facilities. •Traditional drilling and blasting methods are no longer employed as the primary means of ...

Get Price

Mining geology of the principal resource coals of the ...

 · In others, shale wedges and lowsulfur coals are distributed on either side of the channels (Fig. 12A–B, 12B–C). Because lowsulfur coals have more economic value than highsulfur coals, significant mining has occurred along both the Walshville and Galatia paleochannels, which has meant mines have had to deal with a host of other mining issues related to paleochannels including partings ...

Get Price

Home

Our wedges have been used for machinery repair and maintenance at various facilities throughout the USA and Canada. These are specifically designed for appliions in which gears,pulleys,mixers,pumps,valves,flanges or other obstinate objects, etc., are pressed, rusted or otherwise frozen in place on a shaft or similar. We have supplied these to breweries, bakeries, Paper .

Get Price

Coal mine safety engineering

hand with picks, sledges, and wedges with the subsequent use of explosives, was mined by the use of mining machines, first Qy the compressed air puncher type and later with the chain type cutter. By . using mining machines more rapid extraction of coal resulted, end oonsequently, more tonnage per individual was produced; yet, accidents occurred. due to alloWing greater areas of roof, unsup ...

Get Price

A the MINEmTlMBER MARKET

bituminous coalmining industry. planking, wedges, crib blocks, construction and repair, and a number of minor uses (fig. 2). As coal is extracted from the cod seam, roof support timbers are set and, depending on the mine or area in the mine, mine ties are laid, flooring is extended, and other uses are made of wood. Thus there is a direct relationship between the tonnage of coal mined and the ...

Get Price

(PDF) FUNDAMENTALS OF COAL MINE ROOF SUPPORT

Direct inmine measurements of horizontal stress in Illinois Basin mines, mostly in roofs above the two study coals, have found a range in magnitudes from 1,207 to 3,191 psi and orientations from ...

Get Price

Mine Timbering Methods

Mine Timbering Methods. Pressure on Mine Timbers. When coal is removed from a seam, the rock strata immediately over the mined area becomes unstable due to the withdrawal of support and is eventually filled with cracks and openings. These openings vary in size, which depend on the nature of the strata. The fragments of rock nearest the opening will fall if they are not supported since there is ...

Get Price