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Tests were conducted to determine properties of four foam agents for their potential use in longwall mining dust control. Foam has been tried in underground mining in the past for dust control and is currently being reconsidered for use in underground coal longwall operations in order to help those operations comply with the Mine Safety and Health Administration's lower coal mine respirable
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Jul 06, 2017 Bosnia: a longwall mine of potential. Bosnia and Herzegovina, or generally abbreviated to Bosnia, is a country in southeastern Europe located on the Balkan Peninsula, with a population nearly touching the 3.5 million mark and spread across an area of 51 000 km3. Bosnia s independent status emerged from the breakup of Yugoslavia about 25 yearsRead More
The potential impact of longwall mining on the hydrogeological environment typically results in a drop in the groundwater table culminating in water loss to the surface by altering water ﬂow paths . In fact, water ﬂow in the Cataract River of Australia ceased in 1994 as a result of mining-inducedRead More
Jan 01, 2018 The sandstone units are typically medium to massively bedded, and fine to medium grained with few micaceous streaks, sparse coal debris, shale streaks, and iron nodules ().Where these sandstones become massive, potential longwall caving issues may be present .Axial and diametral compressive strengths of the sandstone averaged 174.76 and 132.05 MPa, respectively, and theRead More
mining conditions for high productivity longwall plow operations with world record production rates set by Bogdanka. As a result, the Boganka mine is currently the lowest operating cost hard coal mine in Europe. Preliminary analysis by the Prairie team indicates the potential to introduce international bestRead More
Selecting longwall mining at depths 600 m, since both surface mining and bord-and-pillar mining may not be feasible. Insuring the import of spare parts remains easier than it was in the past, and looking into the potential for indigenous manufacture thereofRead More
May 30, 2018 The high productivity being achieved by longwall mining demonstrates its potential for being a substantial segment of underground coal production. Longwall mines produce more than 30 pct of all underground coal, up from 5 pct just 15 years ago. The continued growth of longwall mining without appropriate multiple-seam planning may increase theRead More
Three potential longwall mining methods for thick coal seams in the western United States [Oitto, Richard H.] on Amazon.com. *FREE* shipping on qualifying offers. Three potential longwall mining methods for thick coal seams in the western United StatesRead More
Queensland mining incidents still a concern for safety regulator A coal mine worker was removing a defective pressure gauge from a longwall shield leg. When the worker removed the retaining staple, residual pressure in the hydraulic system ejected the gauge from the fitting with some forceRead More
Generalized sketch illustrating subsidence over longwall mining _____ 6 6. Aerial photograph showing the surface effects of past and present room-and-pillar coal mining along the ... cerned with assessing the potential environmental effects of underground mining. The major em phasis is on coal mining. The time to plan for subsidence impactsRead More
respectively, due to longwall mining. Keywords: Longwall Mining, Height of Destressed Zone, Caved Material System, Minimum Potential Energy, Stability Time. 1. Introduction Longwall mining method is one of the most popular and productive underground methods used in the miningRead More
Public and regulatory focus on the potential impacts of longwall mining on streams dictate that potential surface effects of undermining must be contained within acceptable levels and appropriate restoration and/or mitigation measures can be implemented during and after miningRead More
Mar 24, 2017 Rockburst is a typical dynamic disaster in underground coal mines which its occurrences relate to the mechanical quality of coal seam and surrounding rock mass and also the condition of stress distribution. The main aim of this paper is to study the potential of rockburst in a longwall coal mine by using of passive seismic velocity tomography and image subtraction technique. For this purposeRead More
Aug 07, 2003 Aug 07, 2003 22nd International Conference on Ground Control in Mining, Morgantown, West Virginia, 5–7 August 2003 Author: F. S. Kendorski (AAI) A longwall coal mine in Appalachia about 1,500 ft deep encountered a fault while developing a new longwall panel. The fault extended from mining depth to the surface near a secondary road and drainage. The fault […]Read More