Bacterial corrosion studies at Ontario Hydro

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Mots clés : Corrosion;Bacterial corrosion;Bacteria;Ontario Hydro
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Texte
Sommaire: In certain instances, rocks around underground excavations behave as a plastic mass. This paper offers several solutions to predicting the mode of plastic flow around cavities and designing mining pillars where plastic conditions exist.
Publication: CIM Bulletin
Auteur(s): D. MRAZ
Mots clés: Rock mechanics, Strata control, Pillar design, Plastic rocks, Pillars, Salt rocks
Numéro: 868
Volume: 77
Année: 1984
Texte
Sommaire: Falconbridge Mine has a history of significant microseismic activity dating back to 1955. Since mid-1981, a microseismic monitoring system has been operating in the area around the No. 9 Shaft hoist room located 25 m from the ore zone at a depth of 1200 m. Several mine wide faults dissect this area and have been shown to be microseismic-active due to mining. The microseismic monitor has been interfaced with a small dedicated personal computer and a communications device to perform routine...
Publication: CIM Bulletin
Auteur(s): G.R. DAVIDGE
Mots clés: Rock mechanics, Strata control, Microseismic monitoring, Computers, Falconbridge Mine, Mine faults, Data evaluation, Structural geology
Numéro: 868
Volume: 77
Année: 1984
Texte
Sommaire: The results of a series of model slope pours designed to investigate working pressures on bulkheads during hydraulic pouring of classified tailings backfill are reported. Total bulkhead pressures and fill water pressures were monitored under the condition of a fully saturated backfill. Similitude of the model testing is discussed and equations are developed to estimate bulkhead pressures under prototype conditions. The model results show that good base drainage, combined with a bulkhead...
Publication: CIM Bulletin
Auteur(s): ROBERT J. MITCHELL, JAMES J. ROETTGER
Mots clés: Rock mechanics, Strata control, Bulkhead pressures, Backfill, Underground mining, Drainage, Sloping
Numéro: 868
Volume: 77
Année: 1984
Texte
Sommaire: A computer program is described which will analyze the stability of coal pillars. The extent of the peripheral failed zone and the central elastic core of the pillar, the stress distribution across the pillar and its strength can be determined by a "slice-by-slice" analysis technique. The program incorporates a brittle/pseudo-ductile transition point so that a pillar may fail by brittle fracture or pseudo-ductile yield. It is shown that:
 (i) There is a minimum pillar stress...
Publication: CIM Bulletin
Auteur(s): K. BARRON
Mots clés: Rock mechanics, Strata control, Pillar, Strength, Fracture, Yield, Coal, Stability, Critical widths
Numéro: 868
Volume: 77
Année: 1984
Texte
Sommaire: In the unconformity-type uranium deposit at Midwest Lake, mineralization is associated with extensive host rock alteration, which affects the metamorphic basement as well as the overlying Athabasca Group sandstones. Host rock alteration is manifested by (1) transformation of clay minerals [kaolinite into illite andchlorite (sudoite)}; (2) bleaching due to removal of hematite from the latentic paleoweathering profile and the overlying red bed, Athabasca Group sandstones; (3) loss of coherence...
Publication: CIM Bulletin
Auteur(s): J. HOEVE
Mots clés: Economic geology, Host rock alteration, Uranium deposits, Mineralization, Athabasca Group, Midwest Lake.
Numéro: 868
Volume: 77
Année: 1984
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