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Contributions à la conception géomécanique des pentes minières : le cas de la fosse Tiriganiaq du projet minier MeliadineKabuya Mukendi, Joseph 20 April 2018 (has links)
Ce projet aborde trois aspects de la conception géomécanique des fosses minières à l’aide d’un cas d’étude portant sur la fosse Tiriganiaq du projet minier Meliadine. Dans un premier temps, une méthodologie a été utilisée pour quantifier la fiabilité de la mesure de l’orientation des fractures lors de campagnes de caractérisation géomécanique à l’aide de forages orientés. L’impact du niveau de fiabilité de la mesure de l’orientation sur le résultat d’une analyse cinématique de la stabilité des flancs de la fosse a ensuite été investigué. Dans un second temps, une approche a été développée pour quantifier la contribution des campagnes d’acquisition successives de données structurales sur un site minier à la caractérisation de l’orientation des fractures. L’impact des campagnes successives sur le résultat d’une analyse cinématique de la stabilité des flancs de la fosse a ensuite été investigué. Dans un troisième temps, l’évaluation de la fiabilité des bancs miniers de la fosse par rapport à des critères de fiabilité a été réalisée au moyen d’un outil logiciel bonifié lors des travaux de recherche. Une approche multicritère systématique pour évaluer la fiabilité des bancs miniers à l’aide de cartes de susceptibilité a été proposée.
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Metamorphism in the Prince Albert Group, Churchill Province, District of Keewatin, N.W.T.Wolff, John 04 1900 (has links)
<p> A sequence of metasedimentary rocks comprising the Prince Albert
Group, within and to the southwest of the Ellice Hills, District of
Keewatin, N.W.T., was studied. Petrographic examination of the four
major facies present -- quartzites, greywacke-paragneisses, metaultrabasics
and iron formation was carried out and geochemical whole
rock data was obtained using X.R.F. methods. </p> <p> Metamorphism occurred during the Hudsonian orogeny and came in
three distinct pulses. These pulses are evident in thin section. The
first pulse is characterized by the fonnation of garnet poikiloblasts
and a biotite foliation; the second by a stronger biotite and hornblende foliation accompanied by quartz and muscovite porphyroblasts, and the
third pulse is characterized by the growth of fibrolite needles. The
last pulse of metamorphism shows that fibrolite and orthoclase formed
from the dehydration of muscovite in the presence of quartz. Thus, a
pressure and temperature regime for this event can be inferred from
published experimental studies. These indicate that PM2O ranged from
2.0 to 3.5 Kbars and that temperature ranged from 640° ± l0°C to
670° ± l0°C. Previous pulses may have had higher pressure ranges but
certainly lower temperature ranges prevailed. The present metamorphic
grade of the Prince Albert Group displays mineral assemblages indicative
of the Sillimanite-orthoclase-almandine Subfacies of the Almandineamphibolite
Facies as defined by Winkler (1967). </p> <p> Structural deformation is closely associated with metamorphism.
At least three periods of deformation have occurred. The first is evident
in thin section by the s1 foliation and parallel trains of sialic material
in garnet poikiloblasts. The second period of deformation caused the
rotation of the above garnets, plus formation of the F2 isoclinal folds,
s2 biotite foliation, crenulation of the s1 foliation and the formation
of muscovite-quartz porphyroblasts. The third period of deformation is
responsible for the F3 folding, warping of the F2 axial trace and the
antisotropic growth of fibrolite.</p> / Thesis / Bachelor of Science (BSc)
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Thule Eskimo prehistory along Northwestern Hudson BayMcCartney, Allen P. January 1971 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1971. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 829-838).
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Fragment-Matrix Chemical Analysis of Keewatin Felsic Volcanics From the Kakagi Lake Area, Northwestern OntarioDebicki, Edward J. 04 1900 (has links)
<p> Five pyroclastic breccia rock samples from a felsic volcanic sequence at Kakagi Lake, Northwestern Ontario, have been analysed for eight major elements using X-Ray Fluorescence to study the fragment-matrix relationships. The salic fragments represent a rhyodacitic composition and the matrices are of andesitic composition showing Fe and Mg enrichment and Si deficiency compared to the fragment. </p> <p> Four matrix and four fragment samples were obtained from one rock,and a triplicate analysis of one of these matrices,compared to the average of the four matrices, showed that the variability of the composition throughout the rock was not due to the analytical procedure. </p> <p> These results agree reasonably well with the trends found in previous work by Goodwin (1968) and Baragar and Goodwin (1969) considering the matrices only. The fragment-matrix study for this area is unique and has been carried out in conjunction with Smith (1971). </p> / Thesis / Bachelor of Science (BSc)
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Terrain Disturbances Associated with Tracked Vehicle Movement and Diamond Drilling Activities, Nogash Lake, South Central District of KeewatinMarshall, J. Larry January 1981 (has links)
<p> The movement of diamond drills by tracked vehicles and drill trailers in south Central Keewatin was studied during the summer of 1980. Tests of the physical ground strength showed that the ability of the terrain to resist disturbance from tracked vehicle operations
depended on two main physical factors: the type of surficial material and the presence of water. Moisture contents varied throughout the summer so that the response of till and peat to compression and shear was not constant. As the summer proqressed, the increasing depth of thaw and gradual surface drying caused strengthening of both major types of surficial material. As a result, vehicle trafficability gradually increased throughout the summer. While surface rutting increased the depth of thaw compared to an undisturbed site, especially in peat, after the first few weeks of the thaw this had little apparent effect on vehicle trafficability. In many cases the vehicle disturbance was largely aesthetic giving the impression that the terrain disturbance was much more serious than it actually was.</p> <p> Although the load distribution of the vehicle tracks concentrated much of the longitudinal stress directly beneath the bogie wheels, in most cases the performance of the tracked vehicle itself was adequate. However, problems caused by the drill trailer wheels resulted in unnecessary mechanical strain on the vehicles and created marked increases in terrain disturbance.</p> / Thesis / Bachelor of Arts (BA)
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