Precious Metal Mine Reclamation and Closure, Battle Mountain Resources
San Luis, Colorado
EA is assisting Battle Mountain Resources, a subsidiary of Newmont, with the surface land reclamation and closure of their mining facility located in Costilla County, Colorado. Current reclamation and closure activities consist of completing remaining surface reclamation of mining and milling disturbance, extracting and treating groundwater from the backfilled pits, and assisting with monitoring surface and groundwater within the permit area. EA’s design and closure services at this site include permitting assistance, development of reclamation plans for the lined tailing facility, spillway design, stormwater and diversion ditch design, groundwater and subsurface investigation, modeling, and groundwater treatment. Permitting and compliance activities include regulatory interface, reporting, permitting requirements, development of safety and emergency response plans. Additionally, EA provides process design, instrumentation and controls, electrical, groundwater characterization, and sampling assistance services for the groundwater treatment system.
Site Characterization and Environmental Monitoring
EA’s team of environmental scientists have assisted numerous clients in evaluating and understanding the unique environmental nature of their sites. EA’s multi-disciplined staff design sampling studies, collect field data, compile information, interpret results, and characterize a site based on the study and sampling of surface water, groundwater, wastewater, soil, and air. EA staff also perform long term environmental monitoring at numerous sites to help clients document and maintain compliance with their permitting requirements and individual site mandates.
Aquifer Protection Permits
EA staff prepared Aquifer Protection Permits (APPs) to demonstrate that the facilities incorporated the Best Available Demonstrated Control Technology (BADCT) into their operations. The permits involved intensive investigation of potential discharge points at the site including valves, pipelines, tanks, pits, and the mines themselves to either document compliance or design required control technologies that could be implemented in a reasonable period of time.
Adaptive Management Plan Water Use License
Victoria Gold Corporation, Eagle Gold Project, Yukon, Canada
EA assisted in developing the Adaptive Management Plan (AMP) for submission in the Water Use License for this proposed open pit, heap leach gold mine. The purpose of the AMP was to develop a response framework describing what action Victoria Gold will take in response to aquatic monitoring results reaching pre-defined “action” levels.
Sand and Gravel Mine Permit Preparation
New Raymer Mine, Weld County, Colorado
EA provided documentation and permit exhibits for a new sand and gravel quarry in Weld County, Colorado. EA also supported the air permitting and special use permitting with Weld County. EA reviewed the geotechnical, hydrogeologic, and material conditions of the site, developed an overall quarry plan including a transportation access plan, reviewed the environmental conditions including the existing vegetation and wildlife, and prepared exhibits for the 112 Colorado Division of Reclamation, Mining and Safety CDRMS permit application. The overall mining plan for the site included the development of a site plan with mining cross-sections and property setbacks; conceptual grading and groundwater control plan, and selected significant geological cross‑sections. For this project EA played a key role in preparing 12 of the 20 exhibits required for the 112 CDRMS permit application.