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CHALLENGES TO MINE BACKFILLING IN POOR ROCK FORMATION WITH HIGH ARTESIAN MINE WATER PRESSURE
Gamal, M., D. Hibbard, and M. Bautz.
36th Annual Meeting of the American Society of Mining & Reclamation, 3-7 June, Big Sky, MT, 23 slides, 2019

The recent backfilling of mine voids in areas that were previously mitigated in the late-1980s and mid-1990s was a challenging project. The mines are located within poor to very poor-quality bedrock at the Glenrock No. 1 and No. 2 Mines in Wyoming. Parts are flooded and were likely the cause of localized flooding within adjacent homes due to the unusually high water table. Grout was injected in areas to ensure that mine voids, rubble, and weak disturbed overburden rock were sufficiently filled with grout. The elasto-plastic rebound of the poor-quality rock caused grout to return to the ground surface upon cessation of grout injection. Recommendations were presented to minimize and control such events. Also presented was a detailed groundwater study to determine if the deformation associated with mine subsidence in Glenrock caused fracturing of the weak overburden rock allowing permeation of water to assist in creating artificial artesian conditions within and above the historic Glenrock No. 1 and No. 2 Mine. https://www.asmr.us/Portals/0/Documents/Meetings/2019/PowerPoints/8C_1100_Gamal.pptx



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