Located 25 miles south of Del Norte, Colorado, the Summitville Mine site is located at an elevation of 11,500 feet in the Rio Grande basin near the headwaters of the Alamosa River.
Summitville Mine Site Location.
The Summitville Mine gained national headlines when the mine operator declared bankruptcy in December 1992 and abandoned the site, leaving behind numerous environmental problems. The most serious issues were related to metals and cyanide loading to receiving streams from flowing adits, the heap leach pad, waste rock piles, a tailings impoundment, and other mine areas.
Summitville Reynolds Mine Bulkhead.
From 1999 through 2005, Deere & Ault Consultants, Inc. (D&A) personnel conducted annual inspections of the Reynolds and Chandler Adits to evaluate the condition of the drainage, bulkheads, pipeline, valves, and ground support. In 2005, D&A rigorously mapped the locations of all supports and evaluated the condition of all timber sets to identify areas in need of rehabilitation.
Summitville Mine Liner Plate.
From 2010 to 2012, D&A was part of a team evaluating alternatives for rehabilitating the Reynolds Adit and bulkhead. Work included conceptual designs and cost estimates for the various alternatives and then carrying the preferred alternative through to final design, prepare plans and specifications, assist in preparation of the bid documents and bid selection, provide construction monitoring, and develop as-built drawings.
Summitville Mine Piping Upgrades.
The design included a bulkhead extension, bulkhead rock mass and contact grouting, pipe for mine pool control, cellular concrete pipe protection, adit drainage, ground support rehabilitation, valve layout, and a new portal structure.
Summitville Mine Portal Structure.
During construction, D&A provided a full time on site resident engineer.
Client: Colorado Department of Public Health and Environment
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