Mining operations face a constant challenge: managing water quality in remote locations while meeting strict environmental regulations. For mines in the exploration phase or those considering restart operations, this challenge can become even more complex. How do you invest in water treatment when you are not yet certain about the mine’s viability or the full scope of contamination you will encounter?
A Nevada gold mine project demonstrates how Veolia’s mobile wastewater treatment systems are providing an answer to these questions. These flexible, rapidly deployable units are revolutionising how mining operations approach water management, offering a practical alternative to permanent treatment plants during the validation phases of mine operation.
The challenge: Treating water in uncertain conditions
The Nevada site faced multiple water treatment challenges. The owners of a historic mine workings were exploring resumption of operations due to advances in extraction technology and rising gold prices. To assess the mine’s potential, they needed to dewater existing wells to access historic underground workings, which meant treating contaminated water without clear data on duration, volumes, or contaminants.
The remote site lies in a water-deprived watershed with limited natural dilution, triggering strict discharge regulations under Nevada Division of Environmental Protection Profile 1 standards and US EPA National Primary Drinking Water Regulations. Initial water quality showed elevated arsenic (470 µg/l vs 10 µg/l limit) and antimony (7.5 µg/l vs 6 µg/l limit), requiring removal before discharge to the rapid infiltration basin. Uncertainty remained about other possible contaminants, concentration stability, and flow rate changes.
Why mobile makes sense
Mobile wastewater treatment plants offer compelling advantages for mining operations facing uncertainty:
Rapid deployment without major capital investment
Mobile units can be quickly transported and commissioned on site without the extensive capital expenditure required upfront for permanent facilities. Available on a monthly rental basis, they can eliminate the financial risk of building infrastructure that might prove unnecessary or inadequate down the road. If the exploration phase reveals the mine is not viable, or if treatment needs change dramatically, the units can be augmented with additional treatment processes or simply removed without significant financial loss and onsite investments in civil infrastructure.
Flexibility to adapt
Water quality often changes during exploration as different ore bodies are accessed. Mobile systems can be adjusted, upgraded, or reconfigured as conditions evolve. At the Nevada site, adaptability was crucial in responding to unexpected challenges over 18 months.
Valuable learning for future decisions
Operating a mobile system provides real-world data on water quality variations, treatment effectiveness, and operational needs, informing for better design of permanent facilities if required.
Compact yet capable
Despite their mobility, modern treatment units pack impressive capacity. The Nevada mine’s system could handle flows from 1500–5000 m3/d while remaining transportable by road and requiring minimal on-site footprint. This capacity rivals many permanent installations while maintaining the flexibility to relocate if needed.
This is a preview of an article that was originally published in the Jan/Feb 2026 issue of Global Mining Review. Check out the full article here and make sure you subscribe to gain access to all the latest insights into the mining industry.