Why ISR? The Efficient Standard for Modern Uranium Production
In-Situ Recovery (ISR), also known as solution mining, is a proven and environmentally responsible extraction method that has become the standard for the uranium industry. Unlike traditional mining, ISR recovers uranium directly from the ground without excavating massive pits or building underground tunnels.
How It Works: The "Geological Sandwich"
ISR is used in specific geological settings where a permeable, uranium-bearing sandstone layer is trapped between two impermeable clay layers. This “Geological Sandwich” acts as a natural vessel, allowing for a controlled, closed-loop extraction process:
- Injection: A water-based solution (native groundwater fortified with oxygen) is pumped into the sandstone through injection wells.
- Dissolution: The solution migrates through the porous rock, dissolving the uranium in place.
- Recovery: The uranium-laden solution is pumped back to the surface through recovery wells.
- Processing: At a Central Processing Plant, uranium is captured on resin beads via Ion Exchange (IX) circuits.
- Recycling: 99 percent of the water used is recycled back into the wellfield, while the captured uranium is dried into Yellowcake (U3O8).
- Safety Monitoring: A network of precisely spaced monitoring wells is established on the periphery of the extraction area—as well as in formations above and below the ore zone—to provide an extra layer of real-time monitoring and ensure solutions remain strictly confined within the targeted area.
The Strategic Advantage
Institutional investors and regulators favor ISR because it de-risks projects both financially and environmentally:
- Capital Efficiency: Because ISR does not require traditional mills or earth-moving equipment, CAPEX is typically only 15 percent of a conventional mine. This leads to faster production ramp-ups and higher IRRs.
- Minimal Footprint: ISR eliminates open pits, tailings piles, and waste rock heaps. This minimal disturbance accelerates "social license" and permitting.
- Proven Safety: The U.S. Nuclear Regulatory Commission reports that there has never been a drinking water supply contaminated by an ISR operation in 50 years of operation.1
1. U.S. Nuclear Regulatory Commission. (2017, June 22). NRC staff comments on the U.S. Environmental Protection Agency’s proposed rulemaking for 40 CFR Part 192, health and environmental protection standards for uranium and thorium mill tailings (ADAMS Accession No. ML17173A638). https://www.nrc.gov/docs/ML1717/ML17173A638.pdf
Global and U.S. Adoption in 2026
ISR is the dominant technology for the current nuclear renaissance:
- Domestic Leadership: ISR accounts for nearly 70 percent of total U.S. uranium production. Active facilities include Alta Mesa in Texas and Christensen Ranch in Wyoming.
- Global Standard: Over 55 percent of the world’s uranium is produced via ISR. In 2026, Canada joined this trend with the first-ever ISR approval for the Wheeler River project.
- Recent Momentum: In April 2026, production commenced at Burke Hollow in South Texas—the first new U.S. uranium mine in over a decade—further validating the ISR model.
Nexus Uranium: Built for the ISR Cycle
Nexus is strategically positioned with a portfolio concentrated in historic U.S. districts with high ISR potential. Our flagship Chord project in South Dakota sits in a proven sandstone district, allowing us to leverage this efficient technology to meet the urgent domestic mandate for clean, carbon-free energy.
