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

Ernesto e Pau-a-Pique

The Ernesto e Pau-a-Pique (EPP) Mine is located in the Municipality of Pontes e Lacerda, at 440 kms west of Cuiba City, Brazil. The mine is operated by Apoena Mining, a subsidiary of Aura Minerals Inc. Tierra Group was retained…

VIEW PROJECT

Myra Falls

Tierra Group provides Tailings Stewardship Services for Nyrstar's Myra Falls Mine Tailings Storage Facility. Tierra Group performed a 5-year Dam Safety Review consistent with the Canadian Dam Association protocols, site training and in depth inspections of management practices and facilities…

VIEW PROJECT

Equity Silver ITRB

Tierra Group's Matt Fuller, LEG, P.Geo. serves as one of three ITRB technical experts providing technical assurance of the Engineer of Record’s design and monitoring compliance with BC regulations, the Newmont Corporate Tailings Standard, and industry best practices.

VIEW PROJECT

Boleo Mine

Tierra Group performed an independent technical peer review of the Boleo Mine’s operating tailings storage facility design. In doing so Tierra Group identified several design modifications that when implemented for future stages will reduce sustaining capital cost expenditures by several…

VIEW PROJECT

Anglo American Quellaveco Mine | Perú

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

La Libertad Mine

Tierra Group engineers designed La Esperanza TSF, a 2.1-km long, 35-m high, earthfill tailings dam with an HDPE lined impoundment footprint of 840,000 m2. Tierra Group  designed and provided Construction Quality Assurance (CQA) for all subsequent downstream dam stages. Stage…

VIEW PROJECT

Aranzazú 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

Tajo Crimea Project

Tierra Group evaluated the Tajo Crimea Pit’s geotechnical and hydrogeological characteristics to determine in-pit tailings storage feasibility. The project scope defined geotechnical and hydrogeologic site conditions through field investigations and in-situ pump testing. Tierra Group developed a 3D groundwater model…

VIEW PROJECT

Bolanitos

Tierra Group provided Tailings Stewardship Services including a dam inspection, slope stability analysis review and operational improvements for Endeavour Silver’s Bolanitos tailings storage facility.

VIEW PROJECT

Quinsam Coal

Tierra Group served as an independent subject matter expert for the Quinsam Coal Corporation (QCC) Independent Tailings Review Board (ITRB) in British Columbia, Canada. The annual review process included review of existing documents, a site visit, and collaborative meetings with…

VIEW PROJECT

San Andrés Mine

Previous to Tierra Group, our Team performed a geotechnical forensics assessment, which determined that spent ore from an on-off leach pad operation had liquefied causing a debris flow, which threatened inundating a major river basin. A preventative detention buttress was…

VIEW PROJECT

Stibnite Gold Project

The Stibnite 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