Influence of coal rib pillar width on the stability of strata around the face-end and gatehead in longwall mining

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Mots clés : Coal Mining;Pillars;Rib pillars;Ground control;Longwall mining;Gateroads;Packing systems
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Texte
Sommaire: This paper describes the Sasol coal liquefaction process, as used in South Africa. It covers coal supply, coal gasification, gas purification, Fischer-Tropsch synthesis, the major utility systems involved and the economics of the process.
Publication: CIM Bulletin
Auteur(s): M.M. PAPIC
Mots clés: Coal liquefaction, Sasol process, Synthesis, Fischer-Tropsch synthesis, Gasification, South Africa, Gas purification.
Numéro: 830
Volume: 74
Année: 1981
Texte
Sommaire: The gravimetric dust sampler is one of the tools now available to the industrial hygienists for determining the worker's exposure to the numerous types of paniculate matter that may be present in the workplace. The paper reviews the different sampling trains that can be used for the two major criteria for respirable dust and some of the sources of error in this dust assessment technique.
Publication: CIM Bulletin
Auteur(s): W.A. BARDSWICH
Mots clés: Environmental control, Dust sampling, Gravimetric dust sampling, Konimeters, Impingers, Sampling.
Numéro: 830
Volume: 74
Année: 1981
Texte
Sommaire: The main solution, ore and residue pulp streams in the Rio Algom Quirke I uranium mill at Elliot Lake have been sampled and analyzed for radium-226. Analysis of the ore and leached residues indicates that Ra-226 dissolves and precipitates within the first pachuca tank. A maximum of approximately 0.2% of the Ra-226 in the ore remains in solution during leaching.
Publication: CIM Bulletin
Auteur(s): J.M. SKEAFF
Mots clés: Radium, Rio Algom Ltd., Quirke mill, Elliot Lake, Leaching, Acid drainage, Radionuclides, Uranium tailings, Ore processing.
Numéro: 830
Volume: 74
Année: 1981
Texte
Sommaire: The detection and quantification of the degree of weathering is an important aspect of coal exploration and mining. Tests for weathering which are suitable for the exploration camp should be fast, simple, and require minimal equipment and operator expertise. In this study, two tests which fulfill these requirements were evaluated using samples of Western Canadian coals. These tests, one based on the pH of a coal slurry and the other on the flotation of coal in a water/diesel oil mixture, do...
Publication: CIM Bulletin
Auteur(s): D.L MARCHIONI
Numéro: 830
Volume: 74
Année: 1981
Texte
Sommaire: Shaft sinking by blind shaft drilling offers the mining industry a different approach to shaft construction. Benefits of blind drilling include less construction time and fewer safety problems while being economically competitive with conventional sinking methods under certain conditions in soft water-bearing formations.Technology and equipment are available today to drill blind shafts up to 20 feet in diameter and over 3,000 feet deep. This is an extension of proven techniques developed by...
Publication: CIM Bulletin
Auteur(s): R.P. CARONE, D.A. WHITLEY
Mots clés: Shaft sinking, Drilling, Shaft drilling, Blind shaft drilling, Rotary drilling.
Numéro: 830
Volume: 74
Année: 1981
Texte
Sommaire: Whitehorse Copper is a 2600-ton-per-day underground copper mine located within the city limits of Whitehorse, Yukon. In early 1978, due to increasingly difficult ground conditions, it was decided to investigate the conversion from longhole open sloping to vertical crater retreat mining. On-site crater testing by C-I-L demonstrated the feasibility of V.C.R. mining at Whitehorse Copper.After some investigation, a down-the-hole drilling rig was chosen and drilling began in November 1978....
Publication: CIM Bulletin
Auteur(s): J.J. JANSSENS, P.W. PERCIVAL
Mots clés: Underground mining, Vertical crater retreat mining, Soft ground, Whitehorse Copper Mines Ltd., Drilling, Blasting, Loading.
Numéro: 830
Volume: 74
Année: 1981
Texte
Sommaire: An initial test of this unique application demonstrated that hot gunned refractory would adhere satisfactorily. Subsequently, it was found that the proportion of material sticking during application increased with increased vessel temperature and when a mix containing pitch was used. About 75 per cent of the latter type adhered when it was applied at 1600°C.TBRC availability increased from an historical average of 62.5 per cent to 64.7 per cent during four campaigns when hot gunning was...
Publication: CIM Bulletin
Auteur(s): W.J. THOBURN, M.R. ALBERTY
Mots clés: Process metallurgy, Gunning, Inco, Refractories, Converters, Top Blown Rotary Converter, Refineries, Nickel refining.
Numéro: 830
Volume: 74
Année: 1981
Texte
Sommaire: Technology exists today to blind drill a mine shaft 20 feet in diameter, unlined, over 3,000 feet deep. These shafts must be lined in the most economical, safe and expedient manner possible. A new technique of stacking precast concrete cylindrical sections in the unlined shaft has been developed to yield a dry and hydrostatically lined shaft.These sections must withstand an external radial pressure of 3,000 feet of water yet take up as little room as possible in the shaft. Using high-strength...
Publication: CIM Bulletin
Auteur(s): ERIC R. SKONBERG
Mots clés: Shaft sinking, Shaft drilling, Blind drilled shafts, Liners, Concrete liners, Precast concrete, Hydrostatic pressures.
Numéro: 830
Volume: 74
Année: 1981
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