Sweetwater Mine

Project Highlights:

  • Permitting
  • Tailings Operations Planning
  • CQA
  • Liquefaction
  • Seismic Stability
  • Slope Stability Analysis
  • Engineer of Record
  • Conventional Tailings

Sweetwater Mine Permitting

Tierra Group’s Team began work at the Sweetwater mine in 1993 assisting permitting and developing tailings impoundment management strategies for the mine. We successfully designed and installed an innovative internal seal for repair of the mine’s damaged decant discharge conduit. Tierra Group began working at Sweetwater again in 2015 designing a 5 foot TSF dam and spillway raise. Unique design challenges were overcome with a comprehensive field investigation including CPT and hollow stem auger drilling. Liquefaction analyses were performed and incorporated into the upstream raise design. A challenging hydrology model was completed and a raise to the existing spillway was designed. The raise design was approved by MDNR Dam and Reservoir Safety council in March 2016. Construction was completed in early 2017 with support provided with Tierra Group overseeing construction activities and evaluating proposed design changes. An As-Built report was completed in April 2017 conforming to MDNR requirements. Tierra Group provided additional support at Sweetwater by designing a 23 foot dam raise providing more than 15 years additional tailings capacity. A new spillway and saddle dam was included in the design. The dam raise design was approved by MDNR in July 2018. Tierra Group supported dam raise construction in 2021 completing design optimizations that reduced construction costs, supporting construction, and completing an as-built report.

Project Highlights:

  • Permitting
  • Tailings Operations Planning
  • CQA
  • Liquefaction
  • Seismic Stability
  • Slope Stability Analysis
  • Engineer of Record
  • Conventional Tailings

Similar projects

Midas Gold Project

Midas Gold’s project is located in the remote central Idaho Rockies near the town of Yellow Pine.  It is a brownfields gold-antimony project featuring three open pits and an anticipated 22,000 tpd plant throughput, along with challenging terrain and environmental…

VIEW PROJECT

Marlin Mine

Tierra Group provides Tailings Stewardship Services for the Marlin Mine Tailings Storage Facility. Tierra Group performed a 5-year Dam Safety Review consistent with the Canadian Dam Association protocols, a Facilitated Risk Assessment, site training and in depth inspections of management…

VIEW PROJECT

Hollister Waste Rock Facility

Hollister Waste Rock Facility Storage Tierra Group performed a third-party peer review of a Waste Rock Storage Facility (WRSF) design at Klondex Mines’ (Klondex) Hollister Mine in northern Nevada. The WRSF, as designed, involved lining the mine’s existing West Pit…

VIEW PROJECT

2020 TSF Annual Dam Inspection

Tierra Group completed an annual dam safety inspection (DSI) to meet both Nevada Division of Water Resources (NDWR) Dam Safety and the client's requirements. The DSI included reviewing monitoring data, a dam and appurtenant structures inspection, and a DSI report.

VIEW PROJECT

Newcrest Cadia Tailings Stewardship

Tierra Group provided Tailings Stewardship Services for TSFs and water dams at the Cadia, Terfer, and Red Chris properties. Responsibilities included data/report review; identifying and assisting the client with managing risks, liabilities, controls, and reporting; evaluating progress towards GISTM compliance;…

VIEW PROJECT

Anglo American Quellaveco Mine | PerĂș

Tierra Group supervised a geotechnical and hydrogeologic drilling investigation program at Anglo American’s Quellaveco Mine in the Moquegua Region of Peru. Geotechnical Investigation Tierra Group developed a geotechnical and hydrogeological research plan within and near the Quellaveco Pit footprint. This…

VIEW PROJECT

Terronera Project

Hydrogeologic Characterization Tierra Group provided hydrogeological support for data characterization and developed a conceptual and groundwater model to evaluate mine water inflows and the associated groundwater drawdown due to mine dewatering activities. Water Management Technical Review Tierra Group provided a…

VIEW PROJECT

Empire State Mine

Dam Breach Analyses Tierra Group prepared a DBA to evaluate potential downstream impacts due to a hypothetical failure (breach) in three components of Empire State Mines (ESM) tailings storage facility (TSF): North Dam (ND), South Dam (SD), and West Perimeter…

VIEW PROJECT

AranzazĂș Mine

The Aranzazú Mine is a copper-gold-silver mine located in the northeastern region of Zacatecas, Mexico. The mine includes both open pit and underground operations. The mill currently processes 2,600 tonnes of ore per day. Tierra Group finalized the geotechnical investigation…

VIEW PROJECT

Topia Mine

Topia Mine Phases 1-3Tierra Group supervised the first 3 phases of Geologic Mapping and Instrumentation Installation and developed a Mechanically Stabilized Earth Wall Design at Great Panther Silver’s Topia Mine in Durango, Mexico.

VIEW PROJECT

Hermosa Project

Tierra Group provided a Third-Party review of the Hermosa Project Tailings Storage Facility Design and Construction stages 1 & 2 in Patagonia, Arizona

VIEW PROJECT

Midas Mine

The Midas Mine is located in northern Nevada, and is owned and operated by Hecla Mining Company.  The mine is an underground mine with an operating mill. The mine’s existing tailings facilities are nearing their end of operating life and…

VIEW PROJECT