Scholarship & Research
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Item Evaluation of selected phosphate sources for the control of acid production from pyritic coal overburden(Montana State University - Bozeman, College of Agriculture, 1990) Spotts, EdwardItem Geochemical characteristics of a waste rock repository at a western gold mine(Montana State University - Bozeman, College of Agriculture, 1997) Outlaw, Jason DwayneItem Hydrology of a waste rock repository capping system at the Zortman Mine(Montana State University - Bozeman, College of Agriculture, 1997) Warnemuende, E. A.Item Hydrologic evaluation of tailings covers at the Golden Sunlight Mine(Montana State University - Bozeman, College of Agriculture, 1994) Strong, Murray RandalItem Metal accumulation in voles from an acid mine drainage impacted wetland(Montana State University - Bozeman, College of Agriculture, 1990) Zavitz, Thomas LindseyItem Geochemical characterization of sulfide mineral weathering for remediation of acid producing mine wastes(Montana State University - Bozeman, College of Agriculture, 1993) Jennings, Stuart Russell; Chairperson, Graduate Committee: Douglas J. DollhopfThe generation of acid mine drainage as a consequence of sulfide mineral oxidation is a widespread source of resource degradation. The objective of this investigation was to evaluate the influence of sulfide mineral weatherability on acid generation processes. In addition to acid generation by pyrite, the weathering characteristics of common sulfide minerals was investigated and correlated to detection by acid-base account (ABA) methodologies. The influence of particle morphology, and not particle size, was found to exert the dominant control on mineral weathering processes. Massive morphology particles generated acid at a significantly greater rate than euhedral morphology samples. Acid generation was a consequence of mineral dissolution which occurred nonuniformly across the surface of minerals during oxidation. Mineral surface weathering occurred at sites of excess energy including grain edges, steps, defects, microcracks and inclusions, resulting in the formation of etch pits. Massive morphology particles exhibited the greatest density of crystalline defect, and had the greatest rate of oxidation. Sulfide minerals found to be acid generating, in addition to pyrite, include marcasite, pyrrhotite, arsenopyrite, chalcopyrite and sphalerite. Minerals containing sulfur in the atomic structure which were not acid producing include barite, anhydrite, gypsum, anglesite, jarosite, chalcocite and galena. Delineation of acid producing and nonacid producing sulfur forms by ABA extraction methods, a standard operating procedure used in the United States, was determined to be ineffective. Effective mineral classification, particle morphology identification and observation of mineral weathering processes were accomplished by scanning electron microscopy. Accurate assessment of sulfur form distribution and sulfide mineral weathering characteristics are required for effective remediation of sites impacted by mining.Item Evaluation of a constructed wetland : sediment characterization and laboratory simulation of wetland chemical processes(Montana State University - Bozeman, College of Agriculture, 1998) Lyons, Dale WellerItem Remediation of acid rock drainage through the use of a constructed passive treatment system which simulates natural processes(Montana State University - Bozeman, College of Agriculture, 1997) Schmidt, T.G.Item Acid mine drainage treatment in an open limestone channel emphasizing aeration & retention(Montana State University - Bozeman, College of Agriculture, 1998) Franti, D. J.Item Revegetation of riparian mine tailings(Montana State University - Bozeman, College of Agriculture, 1996) Jackson, Don Brooke