Laserfiche WebLink
Colorado Division roject of Reclamation, <br /> Mining & Safety <br /> Alaska Basin Maintenance & Forfeiture Project <br /> San Juan County, CO <br /> Maintenance and Forfeiture <br /> Project 2009 <br /> - �Y <br /> • <br /> ,i vAr <br /> ` k 4 • - � y 3 fit <br /> • <br /> • <br /> '443" <br /> Alalcsa Basin Site 40—Post 1977 shaft prior to backfill closure <br /> The Alaska Basin Maintenance and Forfeiture Project was the third and fmal project in Alaska Basin. Two previous projects worked on <br /> the closures in the basin,the Maid of the Mist 2004 Project and the Alaska Basin 2006 Project. Both of the previous projects <br /> encountered problems due to early snow and early winter shut-downs. In 2006,the Alaska Basin contractor attempted to close mine <br /> opening 38,but found the site to be significantly larger,after the adit collapsed and opened into a stope. Mine openings 41a and 41b <br /> also needed additional backfill because of settling,most likely from the two on-site school buses buried in the stopes. The 2009 project <br /> also addressed post 1977 mining activity at the number 40 shaft, and the number 39 waste piles located in an active stream channel. <br /> Alaska Basin Maintenance and Forfeiture construction started in late August 2009 <br /> and proceeded into mid-September 2009. Site 40 was changed from a grate to Construction Contractor <br /> backfill during construction because site conditions were more suitable to backfill K&P Property Design <br /> due to unconsolidated bedrock and mine waste at the surface. Site 40 should be 236 S.3rd#219 <br /> monitored for settling of the backfill. Snow remained on site 38 well into late Montrose,CO 81401 <br /> August. As a result,site 38 had to be shoveled out in order to install polyurethane <br /> foam. Site 38 should be monitored frequently due to the unstable and collapsing Project Cost: $11,680.00 <br /> nature of this site. Sits 41a and 4 lb received additional fill,but may continue to <br /> subside due to the large school buses located inside the stopes. These may cause DBMS Project Manager <br /> some settling to occur in the future. Mine waste at site 39 was moved away from Kirstin Brown,303.866.3567 <br /> the creek and placed against the slope and adjacent to the number 39 adit backfill. <br /> Colorado Division of Reclamation,Mining,&Safety <br />