2005-10-24_REVISION - M1987028 - Laserfiche WebLink

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Topsoil Recovery and Stockpile Locations Up to six feet of topsoil may salvaged sourced from the azeas directly above the footwall contact, although many exposed surfacelbedrock contacts show 1' or less of soil covering bedrock. The white mazble "seam" itself has little to no soil cover, which can be discerned from aerial photos. Topsoil stockpiles may be located in several areas during the maturation of the mine plan at the Lilly Mines site. ,topsoil stockpiles aze located along the southeastern portion of the lower staging azea. This topsoil will be used for surface application along the eastern slopes of the lower staging azea waste rock dump. These soils will be available for use in the next two or three field seasons to aid in re- vegetation of the eastern edge of the lower waste rock dump and the berm along the roadway separating mine drainage from Taylor Gulch drainage. Topsoil stockpiles will be located at the upper, western portions of the affected land, above the highwall benches, to be used for final re-vegetation of the flat bench tops. Topsoil stockpiles will also be located east of the marble bed but west of Taylor Gulch drainage in the northern end of the affected lands. These topsoil stockpiles will not be developed until later in the mine plan, approximately 10-15 yeazs from present. Topsoil will be placed in temporary stockpiles at slopes no Beater than 2.5:1 and will be contour furrowed to minimize storm event erosion. A drainage swale will be maintained azound each stockpile to minimize soil removal via storm event and/or spring snow melt. Stockpiles remaining more than one season will be broadcast seeded with the approved site seed mix at 20#/acre and mulched with clean straw mulch at 2000#/acre to promote seed germination and survival. It is estimated that the area immediately west of and above the highwall azeas will provide between 25000 to 35000 tons of topsoil, enough material to cover 20 acres of disturbed land 6" deep and 8 acres of bench azea 1' deep. In addition, topsoil recovered from stripping operations immediately east of the marble bed and in localized azeas directly above the mazble bed as mining progresses north from its current location will be placed in stockpiles located along the upper highwall zone or in the upper reaches of Taylor Basin in the northern portion of the affected land, west of the Taylor Gulch drainage channel. This azea will provide an additiona15000-10000 tons of soils to be used in final reclamation work. Topsoil Stockpile Locations and Estimate of Maximum Volumes Location Est. Year Constructed Estimated Tonnage Lower Staging Area 2006-7 5000 Footwall Benches 2007-2012 20000 North End/Hangingwall 2015-20 10000