Lost Creek ISR Project – Great Divide Basin, Wyoming
Focus on Operational Execution
During 2025, Ur-Energy advanced wellfield development and brought four additional header houses online at Lost Creek. The Company drummed 410,440 pounds of U₃O₈ in 2025, up from 249,209 pounds in 2024, and shipped 420,144 pounds, reflecting improved throughput and operating execution.
The Company continues to make progress proactively identifying and addressing operational challenges while advancing detailed engineering solutions to improve flow and plant performance.
In 2026, operational priorities remain focused on continued ramp-up, plant optimization, and sustained production rate increases. Several new header houses are expected to be brought online in MU1 Phase 2 during the first half of the year, with the first commissioned in February. Planned investments, including commencement of construction of a wastewater treatment facility, are expected to facilitate increased overall plant throughput over time.
Lost Creek is fully staffed, with ongoing emphasis on retention and training to support continued operational improvement and efficiency. With 15 active drill rigs, drilling and wellfield development remain on schedule, positioning the operation to continue increasing production.
Drilling at Lost Creek continues to demonstrate consistent success in expanding estimated mineral resources and extending mine life. As detailed in the Lost Creek Report, the mineral resource estimates for the Property reflect 11.9 million pounds in the Measured and Indicated categories, and 10.4 million pounds in the Inferred category. The estimated mine life through final wellfield production (but excluding additional restoration) has been extended by nearly three years, with the potential for additional cash flow and long-term growth. Historically, each phase of drilling has supported the addition of estimated mineral resources. Notably, only a relatively small portion of the Lost Creek Property has been drilled to date, underscoring the scale and growth potential of the asset base and supporting a potential longer-term production outlook.
Shirley Basin ISR Project, Shirley Basin, Wyoming
Significant Progress Towards Commissioning
During 2025, we made significant progress on wellfield development and initiated construction of the plant facility at Shirley Basin. Construction of the plant building is well advanced, with all ion exchange columns installed and key tanks set. Remaining interior construction, commissioning of production circuits, and construction of phase two infrastructure are expected to progress through 2026, followed by the ramp-up of operations.
Pending approvals from the WDEQ, Header House 1-1 is ready to be brought online to commence injection in and recovery from the wellfield. Development of additional header houses in Mine Unit 1 is ongoing, positioning the project for production operations and phased production growth as commissioning progresses.
The wellfield data package for Mine Unit 1 is currently under review by the WDEQ, which also began its pre-operational inspection in late February 2026. Additional site visits are expected as the inspection process continues. Following completion of the inspection and regulatory review, we expect approval to begin recovery from the wellfield and collection of uranium onto resin in the plant.
Drilling activity continues at a strong pace. Through February 2026, the Company has pilot drilled 469 injection and production wells in Mine Unit 1, currently supported by eight active drill rigs. With delineation drilling completed historically, activity is focused on efficient development and construction to support near-term production.
Shirley Basin has a licensed wellfield capacity of one million pounds of U₃O₈ per year. Total annual production from wellfield recovery and toll processing is permitted at up to two million pounds U₃O₈ equivalent. Shirley Basin is designed as a satellite operation, with loaded resin to be transported to Lost Creek for processing. We expect to be able to commence transporting loaded resin to Lost Creek for processing, drying, and drumming in summer 2026, subject to the receipt of additional regulatory approvals.
Staffing at Shirley Basin is substantially complete, with a focus on training and operational readiness. Leveraging Ur-Energy’s operating experience at Lost Creek, the Company expects a disciplined ramp-up as Shirley Basin transitions into production, providing a second U.S. ISR production platform and meaningful growth in overall uranium output.