Mining and Milling

Orano Canada relies on its extensive experience and cutting-edge techniques and innovation to extract uranium from deep in the ground and process the ore to produce uranium concentrate known as “yellowcake”.
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Extracting and processing uranium ore

McClean Lake & Cigar Lake: High-Grade Uranium Without Dilution

The McClean Lake mill, 850 km northeast of Saskatoon in northern Saskatchewan, is Orano Canada’s flagship operation. It is the world’s most technologically advanced uranium mill for the processing of undiluted, high-grade uranium ore, which is supplied by the Cigar Lake mine operated by Cameco Corporation, 80 km away (average grade 15% U3O8, the highest in the world). At the mine, ore is extracted from an orebody two kilometres long and 450 m deep, mixed into a slurry, and trucked to the mill site.

The mill can produce 24 million pounds of yellowcake (uranium concentrate) annually, and in 2020 achieved total production of 10.1 million pounds U3O8.

The McClean Lake Mill Process

The Cigar Lake Mine

Cameco’s Cigar Lake mine is the world’s highest grade uranium mine, which has produced over 80 million pounds of ore since beginning operations in 2015. It is also notable for its innovative jet-boring technique, developed specifically for this deposit.

Ownership Structure

McClean Lake
Orano: 77.5%
Denison Mines Inc: 22.5%
Operator: Orano


Cigar Lake
Orano: 37.1%
Cameco Corporation: 50.025%
Idemitsu Uranium Exploration Canada Ltd: 7.875%
TEPCO Resources Inc: 5%
Operator: Cameco Corporation

Another High-Grade Uranium Operation - McArthur River/Key Lake

Orano owns over 30% of the McArthur River mine and nearly 17% of the Key Lake mill, both operated by Cameco. This mine holds large reserves of high-grade ore (7% U3O8 average), which is processed at Key Lake. Production has been indefinitely suspended at both sites due to market conditions, and they are currently in a care and maintenance state.

Ownership Structure

McArthur River Mine
Orano: 30.2%
Cameco Corporation: 69.8%
Operator: Cameco Corporation


Key Lake Mill
Orano: 16.7%
Cameco Corporation: 83.3%
Operator: Cameco Corporation
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