Summary

Mine Type	In-Situ
Study Completed	Preliminary Economic Assessment
Commodities	Uranium
Mining Method	Solution mining
Mine Life	...
Snapshot	In 2006, the enCore Energy Corp. entered into an option agreement to purchase uranium rights on certain areas of the Centennial Project. Pursuant to the agreement, the contingent payments are payable upon receipt of regulatory permits and licenses allowing uranium production. As of 2023, enCore Energy Corp. has neither obtained the required permits and licenses, nor has it been able to renegotiate the option agreement. The Company is attempting to renegotiate the option agreement and the seller has not exercised its option to have the uranium rights transferred back.

Deposit type

• Sandstone hosted

Summary:

The Centennial Project is located within the Cheyenne Basin, a sub-basin of the greater Denver-Julesburg Basin, which is bordered on the northwest by the Hartville Uplift in Wyoming and on the east and northeast by the Chadron Arch in Nebraska.

Uranium deposits in the Centennial Project are sandstone, roll front type typical of those in Wyoming, South Dakota and Texas. These type deposits are usually “C” shaped in cross section, a few tens of feet-to-100 or more-feet wide and often thousands of feet long. Uranium minerals are usually deposited at the interface of oxidizing solutions and reducing solutions or redox boundaries. Typical alteration associated with this redox boundary consists of limonitic and hematitic staining of the sandstones.

As the uranium minerals precipitate, they coat sand grains and fill the interstices between grains. As long as oxidizing groundwater movement is constant, minerals will be solubilized in the interior portion of the “C” shape, and precipitated in the exterior portion of the “C” shape, increasing the tenor of the ore body by multiple migration and accretion. The thickness of the ore body is generally a factor of the thickness of the sandstone host unit. Mineralization may be 10 to 15ft thick within the roll front while being inches to feet thick in the tail portions.

Ore mineralogy consists of uraninite, pitchblende, coffinite, and carnotite, with associated vanadium in some deposits. Typical alteration in the roll-front sandstone deposit includes oxidation of iron minerals up-dip from the front and reduction of iron minerals down-dip along advancing redox interface boundaries.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Commodity Production

Personnel

Job Title	Name	Profile	Ref. Date
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