Results 151 to 160 of about 2,137,122 (310)
Meitan kexue jishuAiming at the characteristics of large stope space, large equipment scale, strong surrounding rock disturbance and close coupling of multi-system of mining-supporting-transportation-supply in 10 m super-large mining height fully-mechanized working face ...
Jinhu Zhang +8 more
doaj +1 more source
Coal and metal/nonmetal mining facts - 2008 [PDF]
"Mining Operations: Data obtained from the Mine Safety and Health Administration (MSHA) indicated 2,129 active coal (14.3%) and 12,778 metal/nonmetal (85.7%) mining operations. 1. There were 26 states reporting coal mining operations.
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Deep Underground Science and Engineering, EarlyView.A lithology identification while drilling method was developed, integrating an automated cuttings sampling system, a smart drilling rig, and an ensemble learning model. Underground trials achieved 97.42% accuracy in real‐time identification of cuttings lithology and composition, enhancing hazard management and supporting unmanned drilling technology in
Kun Li +7 more
wiley +1 more source
An optimizing microseismic method for rock burst early warning based on mining production process
Deep Underground Science and Engineering, EarlyView.A classification early warning method of rock burst based on hourly microseismic data is proposed, which can be combined with the on‐site production process to provide more timely warning. Abstract Microseismic (MS) events have been reported in nearly every coal mining country, which could well lead to rock burst in underground coal mines.
Zepeng Han +6 more
wiley +1 more source
Deep Underground Science and Engineering, EarlyView.A novel shear‐lag model, validated by pull‐out tests, incorporates a constant bond stress stage to predict the complete load–displacement response of grouted rock bolts, providing a new tool for optimizing anchorage length and material toughness in deep underground engineering. Abstract The stability of rock masses in deep underground excavations, such
Wenhui Bian +6 more
wiley +1 more source
Deed of settlement of the Tomago Coal Mining Company.
Cover title.; Includes index.; Ferguson, no.
Tomago Coal Mining Company.
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THE NIGERIAN COAL CORPORATION: AN EVALUATION OF PRODUCTION PERFORMANCE(1960 1987) [PDF]
COAL WAS DISCOVERED IN NIGERIA IN 1909 AND COAL MINING STARTED WITH A DRIFT MINE AT OGBETE, ENUGU IN 1915. SINCE 1958/59, WHEN COAL PRODUCTION REACHED ITS PEAK, THERE HAS BEEN A PERSISTENT FLUCTUATION IN THE AMOUNT OF COAL PRODUCED IN SUBSEQUENT YEARS ...
DR. GODWIN CHUKWUDUM NWAOBI
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Deep Underground Science and Engineering, EarlyView.Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu +4 more
wiley +1 more source
Scientific ReportsIn mining and tunnel engineering, anchor rod drilling rig is the core equipment to ensure construction safety and efficiency. Its rolling bearings, as key transmission components, are prone to failure due to long-term exposure to harsh working conditions
Qiang Hou +4 more
doaj +1 more source
Coal operator mining facts - 2001 [PDF]
In 2001, a total of 2,144 coal mining operations reported employment to the Mine Safety and Health Administration (MSHA). Coal mines comprised 14.7% of all mining operations. Bituminous mines comprised 92.0% (n=1,972) and anthracite mines 8.0% (n=172) of
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