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Cameco Corporation and joint venture partner Orano Mining announced the successful commissioning of expanded tailings management infrastructure and enhanced slurry neutralization systems at the McClean Lake milling facility in northern Saskatchewan. The McClean Lake mill serves as the exclusive regional processing destination for exceptionally high-grade uranium ore slurry mined at Cameco s Cigar Lake underground operation, situated eighty kilometers to the southwest.
The expansion project incorporates an innovative sub-aqueous tailings deposition system deployed within the mined-out McClean Lake JEB pit, designed as an engineered in-pit Tailings Management Facility. Placing neutralized tailings beneath a permanent water cover prevents atmospheric oxidation of residual sulfide minerals, mitigates radiological radon gas emissions, and ensures perpetual geotechnical stability without requiring above-ground earthen dams.
Engineering telemetry from newly commissioned thickener underflow pumps, paste piping networks, and radiometric monitoring arrays confirms balanced consolidation dynamics across the subterranean deposition footprint. Automated chemical neutralization circuits utilize slaked lime, barium chloride, and ferric sulfate to precipitate radium, selenium, and arsenic into stable insoluble mineral complexes prior to deep deposition.
The enhanced milling circuits are engineered to support long-term production rates of eighteen million pounds of U3O8 yellowcake annually from blended Cigar Lake slurries and prospective regional satellite feeds. Energy efficiency improvements across the acid leaching, counter-current decantation, and solvent extraction circuits have simultaneously reduced facility greenhouse gas intensity per kilogram of packaged uranium.
Cameco reaffirmed that operational synergies between Cigar Lake and McClean Lake establish the joint venture as the backbone of North American nuclear fuel supply chains. The partners continue close collaboration with Athabasca First Nations and regional communities, prioritizing local employment, Northern procurement quotas, and joint environmental monitoring partnerships.
Continuous aquatic monitoring stations deployed across adjacent water bodies confirm that treated effluent discharges remain consistently well within Canadian Drinking Water Guidelines and federal environmental quality criteria.
Continuous air monitoring across the mill boundary confirms ambient radon levels remain identical to natural regional background concentrations.