Laserfiche WebLink
Exhibit E—Reclamation Plan <br /> Regarding the mine pit area being free-draining or impounding water, we offer this description: Pit floor <br /> has never exceeded 5' in depth and does not continue to rise. Pit floor will be backfilled to eliminate <br /> ponding water <br /> Geotechnical stability: This material has been mined for many years, and has been shown to be <br /> unfractured and competent. Mining is carried out by blasting, which creates hard angular pieces, not <br /> prone to weathering, becoming rounded or prone to moving. Since it will continue to be mined with <br /> walls and benches,with overall slope close to the stable angle of repose, no study was necessary to <br /> confirm that it would be stable post-reclamation. <br /> Bench drainage and runoff control: The benches will be slightly sloped so as to provide positive drainage <br /> and avoid collection or concentration of runoff water. It is expected that the overburden and topsoil <br /> placed on the benches will be underlain by remnant layer of broken obsidian "gravel" which will improve <br /> drainage. We believe this configuration will help preclude the need for extensive berms and ditches, and <br /> help retain growth medium on the benches. <br /> Exhibit F—Reclamation Map <br /> Cross sections of the mining area, along two axes, is included. The Reclamation Map has been updated <br /> to include the name of the operator, and is also resubmitted herewith. <br /> Exhibit G—Water Information <br /> The depth to groundwater is not known, in either the quarry area or the unmined areas around the <br /> quarry. Water has not been observed to seep from the quarry walls or floor. Exploration drilling in the <br /> vicinity has revealed that the obsidian deposit extends fairly deep but drilling did not encounter <br /> groundwater. Water is not always present in the pit floor, but occurs after precipitation events,which <br /> indicates that it is correlated with surface runoff, not groundwater. <br /> Upland diversion berms or ditches will be constructed to preclude, as much as possible, any upland <br /> runoff from entering the mined area. These may be above the sloped overburden areas on land that has <br /> not been stripped or shaped, or on the stripped/shaped land lying immediately above the top of the <br /> walls and benches. Either way, this diverted runoff will be routed to the sediment/runoff control pond to <br /> be constructed at the toe of the operations pad (at the pit). <br /> The operator has applied for discharge permit. <br /> Exhibit L—Reclamation Costs <br /> The acreage figures of the areas for final reclamation have been submitted in the original conversion <br /> materials, and the areas of activity are depicted in the Exhibit C and Exhibit F Maps(for Phase 1). <br /> Not all of the following listed areas will be disturbed at one time, since activities will be carried out over <br /> many years. As mining progresses certain areas will be able to be reclaimed concurrently, as explained in <br /> Exhibits D and E. Totals are shown below however, since this is being requested as an adequacy item. <br /> The following acreages are being provided to assist the DRMS with estimating reclamation costs. <br />