Projects

 

An Engineering Evaluation/Cost Analysis was completed for the Forest Service for removal and cleanup activities under CERCLA at the Zaca Mine Complex, an abandoned underground gold and silver mine located in Alpine County, California, in the Humboldt-Toiyabe National Forest (Millennium, 2003). The removal and cleanup action objectives were to improve water quality in adjacent Monitor Creek by reducing discharge of acid mine drainage to surface water; provide for the viability of native plant and animal species; protect and restore aquatic, riparian, and meadow systems; and restore degraded ecosystems and processes.

• VESTRA/Golder prepared the final design documents for the abandoned mining features at the Lower Advance Adit, Lower Colorado Adit, Zaca Tailings, Lovestedt Tailings, Loope Canyon Well, Loop Canyon Adit, Deadman Adit, and Curtz Mine.
• Four of the sites involved the design of collection and infiltration galleries as a means to reduce the discharge of acid rock drainage to Monitor creek.
• Two of the sites involved the removal and/or regrading of existing tailings piles adjacent to Monitor Creek. Design included regrading and placement of topsoil to reduce erosion of the tailings into Monitor Creek.
• The Curtz Mine project design included regrading the existing tailings pile, covering with topsoil, and revegetating as well as relocation of an existing wetland.