Laserfiche WebLink
As mining progresses, backfilling will be done concurrently, which will restore the landscape to its <br />approximate original contour. If gravel sales grow significantly, this will still be offset by swell in <br />the mined material, which is expected to be over 20 %. The water exposure for the placer excavation <br />pit will be limited to a maximum of 9000 square feet ( .21 acres). The water exposure for the placer <br />processing plant ponds will be limited to a maximum of 18000 square feet ( .42 acres). The water <br />exposure for the infiltration pond will be limited to a maximum of 32230 square feet (.74 acres). <br />This gives a total surface water exposure of 1.37 acres. <br />Section 2.0 General Geology of Site <br />The geology of the site is best described as the upper reach of the South Platte River in Pliestocene <br />glacial moraine gravels mixed with some Quaternary gravels of recent age. Sand beds and clay <br />beds are also interspersed with the alluvium. Depths of this material range from 30' to 100' within <br />the permit area. These gravels overlay a bedrock of pre - Cambrian schist, gneiss and intrusive gran- <br />ite, which are also present in the mountains on both sides of the permit area. Only minor stratifica- <br />tion has been seen in the gravels since boulders of 10 " -15" size are found in some sand beds, prob- <br />ably from glacial meltwater. The gold veins in igneous rock on the south side of Hoosier Pass and <br />in the upper basin of the South Platte drainage are the origin of the placers through thousands of <br />years of glacial activity during the last ice age and subsequent erosion. Due to the fineness of the <br />gold at the site (0.833 fine), the gold placer has been traced to gold from North Star Mountain in <br />the Montgomery Deadwood area in the upper reach of the basin. <br />Section 3.0 Gold and Gravel Mine Facilities <br />The gold and gravel mine operation will consist of the following facilities: <br />- portable gold processing plant (may be sluice, jigs, bowls, cyclones or other equipment) <br />- truck scale with small portable scale office <br />- assorted power poles delivering power to the camp area <br />Gloria Z Mine 2013 Amendment 9 <br />