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Colorado Division roject of Reclamation, <br /> Mining & Safety <br /> London Butte Mine Reclamation Project, continued <br /> Work Description- Phase II <br /> Contractor mobilization and site preparation began in Left:London Butte Tailings <br /> August of 2014. Tailings were removed from a 2 acre '` material eroding into South <br /> � g Mosquito Creek, was further <br /> area including a large stockpile near the Butte Mill and ...^ * , accelerated by the 2011 <br /> from tailings that extended down to South Mosquito landslide. Photo dated 2012 <br /> Creek. Excavated tailings were placed in the '� prior to reclamation. <br /> y . <br /> consolidation area developed around and over the , <br /> old <br /> .,,,• Below: 2014 London Butte <br /> Butte Mill Foundation. A series of underdrains and ‘% Tailings were removed,geogrid <br /> channels were constructed to intercept and divert both x '" ' was placed over soft subgrade <br /> ground and surface waters around the tailings and then covered with dolomite, <br /> consolidation area. Geosynthetic materials were placed <br /> clean backfill and composted <br /> over portions of soft subgrade on tailings adjacent to <br /> biosolids. Banks of South <br /> e... Mosquito Creek were <br /> South Mosquito Creek prior to placement of dolomite t reconstructed with riprap and <br /> and clean soil backfill. Tailings were removed from the _ the entire area seeded. <br /> south bank of Mosquito Creek and the bank was °"► --,, <br /> reconstructed with rock, dolomite and clean fill material. _.. #.w <br /> Dolomite material was excavated from piles on the north <br /> side of the South Mosquito Creek. The dolomite ;- r <br /> material was a byproduct of mining at the London and ", <br /> London Extension and provided pH buffering for acidic R <br /> tailings prior to backfill placement. Clean backfill .. 3. "- <br /> material came from excavation in preparation of theE - f�� � <br /> ' ' ?T,;` <br /> tailings consolidation area and from a borrow source on '" 'j�.Y <br /> the north side of South Mosquito Creek. In addition, <br /> buildings were demolished and debris/trash were hauled " t.1.... ...‘!4..; ' <br /> away and disposed at the Summit County Landfill. , „ <br /> The total area reclaimed in the London Butte Project was � `�r " ~ '= v• <br /> 6.0 acres. The work included excavation of over 15,000 Approximately 1,000 cubic yards of composted biosolids <br /> cubic yards of tailings from the stockpile and removal (donated by Freeport McMoRan)were hauled to the site and <br /> area and subsequent placement in the consolidation area. incorporated into the clean cover soil, and the area was <br /> More than 4,000 cubic yards of dolomite were removed revegetated with a subalpine seed mixture. Funding for the <br /> from the creek banks and used as a buffering cover. project was obtained from Colorado Water Resources and <br /> 11,500 cubic yards of clean fill were excavated and Power Development Authority, severance tax funds and the <br /> placed, including selective excavation and placement of Colorado Department of Public Health and Environment. <br /> rock for stream bank reconstruction. <br /> Left London . <br /> Butte <br /> =.. Tailings <br /> fi ' <br /> ,r -0. "` , Material and <br /> " tc, r . <br /> Debris in 2012. <br /> ° f, • <br /> Right:London <br /> . '- Butte Tailings _ ,,. <br /> "`-a Reclamation <br /> in <br /> completed <br /> , ,v 2014. ` ;, ;;;-,0%,_4. �-y <br />