Summary

Mine Type	Underground
Stage	Restarting
Commodities	Uranium U3O8
Mining Method	Room-and-pillar Split-shooting
Mine Life	...
Snapshot	Daneros project is one of three past-producing, fully-permitted, uranium mines in Utah, and is a large-scale, fully-developed and permitted underground mine. The mine operated from 2009 until October 2012 when it was placed on standby. As of May 2025, IsoEnergy has secured a toll milling agreement with Energy Fuels Inc. at the nearby White Mesa Mill, the only fully licensed and operating conventional uranium mill in the United States with capacity exceeding 8 million pounds of U3O8 annually. As of August 2025, planned work: • Trial new geophysical exploration methods at Daneros for identifying from surface the sands tone channels critical to the regional mineralization. • Leverage new exploration techniques to develop quality drilling targets. Isoenergy has applied to restart White Mesa mill and expand its capacity, and hopes to begin processing uranium ore in 2026.

Deposit type

• Sandstone hosted

Summary:

The Daneros uranium deposit can be classified as Phanerozoic Sandstone; Tabular/Peneconcordant; Basal-channel Type in the classification scheme of Dahlkamp (1993). The Shinarump Member of the Chinle is the only host rock horizon with this type of deposit on the property. The property is not known to hold any potential for any other type of deposit.

The uranium deposit at the Daneros Mine, like nearly all others in the White Canyon district, is in the lower part of the Shinarump, especially where it has scoured into the Moenkopi. The lithology, facies, sedimentary structures, and locations within the channel deposits all were important in controlling the migration of fluids and localization of the deposits. Coarser-grained rock is more favorable than finegrained sand or silt units. Most of the uranium mineralization is overlying impermeable siltstones of the Moenkopi or local siltstone lenses internal of the Shinarump. The lateral edges of channels where they are bounded by mudstones are also favorable locations for mineralization. Sandstones and conglomerates bounded on the top by siltstones or clay layers are also favorable. Intersections of channels and meanders have been found to be favored locations. The most favorable sites are in the coarser sandstone/conglomerates adjacent to finer sediments that contain vegetal matter. The uranium was transported into the area in oxidized groundwaters. The permeability differences related to the grain size of the various facies confined, concentrated, and slowed the flow of the oxidized waters. The accumulations of carbonaceous material created local reducing environments. These reducing conditions caused the dissolved uranium minerals to precipitate.

Uraninite (pitchblende) is by far the dominant primary uranium mineral in the Shinarump deposits. It occurs as distinct grains, fine grained coatings on and pore-fillings between detrital quartz grains, partial replacement of feldspar grains, and as replacement in carbonized wood and other remains of organic matter. Metallic sulfide minerals are often abundant. Where secondary oxidation has occurred, minor amounts of uranyl carbonates, sulfates, and phosphates are found. The source of the uranium is not well established. Overlying shaley units of the Chinle contain clays derived from volcanic ash that is uraniferous. The source area of the arkosic sediments was also a uranium-rich province.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Commodity Production

Personnel

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