Great Lakes E&I has significant experience working under the unique conditions that are often required of mine reclamation projects. We have a team with the ideal blend of capabilities that can only be gained through years of delivering successful mining projects, and has enabled us to develop our Mining Center of Excellence based in Denver, Colorado. Our crews are established and familiar with preconstruction planning (client-specific HSE compliance, fire protection, and other BMPs), cost tracking, scheduling, and earthwork operations. Our mine-specific multi-disciplinary capabilities include site preparation, structure demolition, stream and wetlands restoration, waste rock and tailings regrading, waste rock and tailings cover construction, repository construction and closure, borrow source and quarry development, and site restoration.
LEGACY COPPER MINE RECLAMATION
- In-water construction of an island during winter month
- Site access, bridge, USFS road improvements
- Quarry and borrow source development and operation
- Diversion and reconstruction of Railroad Creek
- Reconstruction/lining of Copper Creek
- Mill and ancillary structure demolition
- Tailings regrading and capping
- Slurry cutoff wall construction
- Installation of more than 4 miles of seep and groundwater collection trenches and piping
This project involved the remediation of a former copper mine on the upper reaches of Lake Chelan. Located deep in the Cascade Mountains, all access to the site is via barge and U.S. Forest Service roads.
SULFUR CREEK MINING DISTRICT WASTE REMOVAL
- Reconstruction of Lincoln Creek stream channel
- Removal of 20,000 cy of mercury-impacted waste rock from six individual mine sites
- Sensitive location near hot springs attraction with year-round visitors
- Bat breeding season
- Hetch Hetchy tribal considerations
- Rehabilitation/construction of over 3.5 miles of roads in order to reach mine sites
- Mobilization of two rail car bridges over two miles of active BLM utilizing cranes to pioneer crossings to the repository
The Sulphur Creek Mine Waste Removal project required mitigation of the migration of mine waste containing mercury into Sulphur Creek. The site is located on approximately 465 acres within the Sulphur Creek watershed in Colusa County, California where elevations range from 1,400 to 1,640 ft above sea level. Several of the mine sites were located directly adjacent to Sulphur Creek, which flows continuously from October to June. The six mine sites included calcine tailings, waste rock, mercury enriched soils, ore, miscellaneous waste piles, and mining equipment and structures. An active hot spring was located on the north bank of Sulphur Creek about one mile east of the Central Mine. Because of a study conducted in 2000-2001 concerning the potential ecological and human health impacts of mercury in the Cache Creek watershed, it was determined that the mine remediation approach would focused on site erosion control and material isolation.