Hertzler Stage III Tailings Impoundment Stillwater Mining Company Nye, MT Construction consisted of a zoned earthfill embankment raise of 44 feet in elevation with 2.0-2.5:1 slopes and a 30 foot wide crest. A composite liner system consisting of HDPE geomembrane over a geosynthetic clay liner was installed over all the upstream slopes in order [...]

Summitville Mine Reclamation Superfund Site Colorado Department of Public Health San Luis, CO The Summitville Mine located in the San Juan Mountains of southwest Colorado is 11,500 feet above sea level and approximately 20 miles southwest of Del Norte, Colorado. Gold and silver mining activities began in 1870 and large-scale open pit mining began in the mid 1980's. [...]

Gilt Edge Mine Superfund Site - Phase 2 Ruby Gulch Waste Repository and Cap Remedial Action Bureau of Reclamation Deadwood, SD The Gilt Edge Mine is an abandoned former open pit gold mine site just southeast of the town of Lead in the Northern Black Hills of South Dakota. Gold has been mined at [...]

Lisbon Valley – Heap Leach Pad & Ponds Construction Stage I & Mill Infrastructure Site Work Lisbon Valley Mining Company Lisbon Valley, Utah The Lisbon Valley Mine is an open pit copper mine located in the Four Corners region of southeastern Utah (southeast of Moab and northeast of Monticello). DelHur was hired by the mine [...]

Pend Orielle Mine Teck Cominco American, Inc. Metaline Falls, Washington The Pend Oreille Mine is a zinc and lead mine and the mine site is located two miles north of Metaline Falls, Washington on the east side of the Pend Oreille River. DelHur was hired on two separate contracts to construct a Tailings Disposal Facility [...]