Peninsula’s uranium resource growth at Lance: ISR flow risks for mine planners
Reviewed by Joe Ashwell
First reported on MINING.com
30 Second Briefing
Peninsula Energy’s Lance uranium project in northeast Wyoming has increased contained resources to 59 million lb. U3O8, including 15.5 million measured and indicated tonnes at 0.05% U3O8 and 38.5 million inferred tonnes at 0.04% U3O8, with the producing Ross area up nearly 16% to 7.4 million lb. Despite this, Peninsula has withdrawn its 2026 production guidance of 400,000–500,000 lb. U3O8 after low solution flow rates in ISR wellfields and has booked a US$50-million non-cash impairment on Units 1–3. The key technical risk now centres on whether the main Unit 4 at Ross can achieve design flow rates and head grades to support the maintained 2027 target of 500,000–600,000 lb. U3O8 and future development of the larger Kendrick and Barber areas.
Technical Brief
- Low solution flow rates in ISR wellfields indicate permeability/connectivity failure between injection and production wells.
- Failure investigation will centre on detailed hydrogeological characterisation, tracer tests and step‑rate injection tests to diagnose flow barriers.
- Ongoing monitoring will need tight surveillance of wellfield pressures, flow rates and head grades to guide pattern infill, workovers or well abandonment.
Our Take
With Lance holding 59 million lb of contained uranium in Wyoming against total U.S. production of 2.1 million lb U3O8 last year, Peninsula Energy is effectively sitting on a resource base that, if brought to steady output, could materially influence domestic supply dynamics rather than just being a marginal producer.
The very low grades at Lance (0.04–0.05% U3O8) mean the economics hinge on in-situ recovery performance and reagent efficiency; the 2019 suspension and later process changes signal that any further ramp-up delays could quickly translate into more impairments like the US$50 million non-cash hit already recorded.
Within our uranium-tagged mining coverage, most U.S. stories are at earlier permitting or restart stages, so Lance’s combination of a producing Ross permit area and a 1.7% resource lift positions Peninsula as one of the few operators trying to scale an existing ISR asset rather than simply advancing a development pipeline.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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