PERMFILE50120 - Laserfiche WebLink

Home Browse Search

h:XI11131'1' U - \linin~ flan Introduction \lining ut ~otth Rank Resourrrs twill be by conventional open pit ntcthnds Intl+luting scrapes. (runt-end louden. track hoc. truck,. if ttccessan, and tsrnt implentcnts lift resealing and reclamation. The planned operation gill consist of do mining the gravel by initially constructing a devtatcring ditch around the perimeter of each of the prolxsed lakes and installing a dewatrring pump that will detvuter the v+nd and grovel and rcutrn the vvatcr to the Culuruiu Riter through un existing slough un the pmpert~. No cxplosites w-ill be needed w extract the sand and gntvel resources. I'hc operation gill produce n;uural sand and gravel and crushed stone which will be used in numtal cunstntction activities such us road base. pipe hedding, etc. and asphalt and concrete production. \u other annmoditics .sill he protiuccd us :, rcwlt of the pl;uutcd mining opcr:uion. I)cwalcrinL Dcwatcrittg will he uccontplishc.l ht using a dcaatering pump that .till he relac:dcd ;ts mining progresses in each cell. Bused un the current Stamm C'reck operations. the dettatcnng rate is expected to lx on the order of ?;(1 gallons-per-minute tgpml, tchen the detvatcring pumps are active. In onler to allow Ibr the seasonal variations in .cater intloty, a I.1N)(1-gpm pump will Ite utiliiai. I)ettatcring water will he discharged according to an appntvcd plan into rxisting >luuch. in unlcr to return the Mater to tlu Colorado Ritcr s)S0.•tn. ~linin :\s illustrated un I'.XI IIBI f ('. mining trill occur on the luteer lcn•acc appn,ximatch llt Icct inside of the hreak itt slope hclwcctt the upper and lower terraces. Phis 1U-liwt bolter twill allow access around the entire perimeter of the proposed pit lake and mining area and slut provide a "margin of safety" should mn of the oterhunlcn from the upixr tem~ce migrate dawn slope. On the Colorado River side ot'the proposed pit. a 100-foot setback will he ohserved tier the pit limit in order to ensure th:u during high-water dents, the river does not :utempt to capwre the pit. fhe access rood. overland conveyor routing, and tentpuran placenunt of uverhurden stockpiles will occur within thr loo-fttttt huller. In order tt, ensure that no material enters thr river scstem a silt Iencc will he constructed and nutintaincd along this side ol'the operation. (ht the eastern end of Cell :1 anJ the western end of Cell 13, where a gas .well and pipeline arc anticipated to he, a huller of 1 ~ feet on etch side o(a centerline of the access road ur a 30-foot corridor will he ohsenvd us dicwted by the gattechnical stahility report which is located in ~1PPI?V1)1X :~ of this upplia+tion, fhttcecer, shoulJ mining commence prior to the constntetiun of the gas well and gas pipeline. the area hctttecn Cells A and B gill he mined d, rtreocer the sand and gravel and rebuilt with overburden and pit run to accommtxlatc the gas wrll and pilxlinc.