2004-04-26_REVISION - M1987064 - Laserfiche WebLink

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PERMIT APPLICATION REGULAR 112 (AMMENDMENT) EXHIBIT D Mining Plan Sandco, Inc. proposes anout-of-stream surface mine to extract sand and gravel materials. This extraction will occur during the winter months of November through March. The mining or extraction of the materials will be confined to the boundaries listed and shown on Exhibit L. Excavation of the materials would be done utilizing a variety of equipment including front-end loaders, scrapers, bulldozers, draglines, track-hoes, truck, etc., as necessary. Although ground water will be encountered, the pit will have a minimum of 300 feet of separation from the neazby Animas River. The groundwater that will be encountered is approximately 8-12 feet below the surface, depending on weather and moisture conditions from yeaz to year. The estimated commencement date for mining will be approximately mid November, 2004. Life of the pit will be largely mazket driven but, based on current volumes of demand, the life expectancy is 20-30 years. Topsoil that will not be used for immediate reclamation will be stabilized with a vegetative cover until it is used for reclamation. Thickness of the topsoil averages 18". From this 18" average and below to approximately 75', is suitable material for processing. The depth of the excavation will be approximately 35'. There will be no stockpiles of waste rock or overburden. Pit excavation will begin at the south end of the pit with removal of topsoil to be stockpiled for reuse during reclamation. Topsoil material in excess of that required for reclamation would be placed in low azeas of pastureland owned by Sandco and adjacent to the pit azea and seeded with native grass. Excavation would begin at the west pit boundary and extend to the east pit boundary. Approximately two acres per year will be stripped to expose the sand and gravel deposit. Upon reaching the east pit boundary, removal of the sand and gravel to about one foot above the groundwater table would progress back to the west pit boundary. Excavated material would be hauled to stockpile at the existing processing area. The subsequent excavation would again start at the east pit boundary and material removed to the final grade. Wet material removed will be placed on the previously excavated surface to allow drainage of water before loading and transporting to the stockpile azea. The backslopes of the pit boundaries will be made to a slope not steeper than 1' vertical to 3' horizontal. Excavated slopes that are temporary, i.e., between the yearly excavations within the pit will be made to approximately 1' vertical to 1.5' horizontal. This procedure will be followed on a yearly basis until excavation is completed to the north pit boundary.