Statement of Qualifications

Aside from the air we breathe, water is the single most important compound to the survival of mankind. Covering 71% of the Earth’s surface, it is vital for all forms of life. Only 2.5% of the Earth's water is freshwater, and 99% of that water is contained in ice (glaciers and icecaps) and groundwater. The relative scarcity of freshwater makes water management imperative to societal success. On Earth, water moves continuously through the hydrological cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff. Hydrology is the study of the movement, distribution, and quality of water. Tierra Group hydrologists, hydrogeologists, and hydrochemists are skilled in the following disciplines:

  • Climatology – Evaluation
  • Water Supply – Surface and Ground Water Exploration and Development
  • Water Balance – Inflow, Outflow, and Losses to a System
  • Storage – Retention and Detention
  • Distribution - Systems
  • Treatment - Quality

Tierra Group has applied its 100+ years combined professional water resources expertise consulting on, or designing and constructing, dozens of these structures on six continents. This geographic variety has allowed Tierra Group’s Team to develop expertise designing facilities under challenging climatic conditions, including:

  • Tropical Wet
  • Tropical Wet and Dry (cyclic)
  • Semi-Arid
  • Arid
  • Mediterranean
  • Humid Subtropical
  • Humid Continental
  • Coastal Marine

Tierra Group has innovatively adapted to these challenging environments using highly-trained professionals and state-of-the-art techniques and software to design water management systems, such as:

  • Supply Systems – Surface Capture and Well Fields
  • Dams - Tailings and Water Storage
  • Hydraulic Structures – Pipelines, Canals, Channels, Pump Stations
  • Treatment Systems – Passive, Active

Regardless of the climatic challenges posed Tierra Group’s broad experience, intimate attention to site-specific conditions, and keen focus on developing innovative solutions has earned us a respected reputation and loyal clients around the world.


Select Water Resources Projects

Goldstrike Mine

Engineer of Record Barrick’s Goldstrike Mine processes 30,000 tons of gold ore per day from its combined open-pit/underground operations located in the historic Carlin Trend in Nevada, U.S.A. Goldstrike’s tailings are stored in the North Block Tailings Disposal Facility (NBTDF).…

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Douglas County Public Works

Tierra Group updated the County’s Standard Operating Procedures (SOPs) for Municipal Operations to maintain the County’s compliance with the requirements for stormwater discharges from the County’s municipal separate storm sewer system (MS4) under the Colorado Discharge Permit System (CDPS). Tierra…

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San Albino Dry Stack Tailings Storage Facility Design

Tierra Group supported construction of the San Albino Mine in Nueva Segovia, Nicaragua. Tierra Group designed a dry stack drum filtered-tailings storage facility. A siting study optimized the dry stack location and minimized CAPEX and OPEX. Tierra Group developed a site-wide water…

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Sweetwater Mine

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…

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Pitarrilla Mine

Tierra Group participated as a member of a multi-disciplinary project team to develop a Definitive Feasibility study for a 16,000 tpd silver mine in Durango, Mexico. Tierra Group's responsibilities included designing a 112 Mt tailings storage facility, developing a site-wide…

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Big Ledge Mine

Tierra Group developed a water balance model to track flows into a backfilled pit at the closed Big Ledge Mine Barite Operation near Wells, Nevada. The Model was used to determine pipeline sizing to a remote treatment pond that is…

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El Mochito Mine

El Mochito is an underground zinc/silver mine located in the Santa Barbara Mountains in north-central Honduras. Tierra Group’s Team has been providing Tailings Stewardship Services at El Mochito continuously for the past 26 years. Since 1989, Tierra Group engineers have provided…

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Esmeralda Mill

Tierra Group was contracted by Waterton Global Mining Company to prepare the FPCP for TSF No.1 at the Esmeralda Mine. TSF No.1 covered approximately 100 acres, included a rockfill embankment with a maximum height approximately 60 feet, and stored gold tailings. Work…

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Confidential Desktop Due Diligence Review

Tierra Group carried out a desktop Due Diligence review of a Preliminary Economic Assessment for a mine development project in the USA. Tierra Group’s review included; mine plan and production schedule, metallurgical testwork, process design, plant water balance, infrastructure updates, tailings…

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Tajo Crimea Project

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

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Masbate Mine

Tierra Group performed a due diligence study of Masbate’s 12-Mt tailings storage facility. Services provided included a forensic study to determine the cause of seepage through an abutment and performed an independent safety audit of tailings management practices. A risk…

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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

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