Summary

Mine Type	Underground
Study Completed	Preliminary Economic Assessment
Commodities	Uranium
Mining Method	Room-and-pillar
Backfill type	...
Mine Life	...
Snapshot	The Marquez-Juan Tafoya Uranium Project is an advanced-stage exploration property which has been extensively explored in the past by drilling and on a portion of which considerable pre-mining infrastructure was historically constructed, which was subsequently dismantled and reclaimed in the early 2000s. The Marquez–Juan Tafoya Uranium Project has historical Indicated uranium resources and a historical preliminary economic assessment (PEA). As of the end of 2025, under its longer-term production plan, Anfield intends to assess Marquez-Juan Tafoya as a secondary portfolio asset and determine a timeline for potential production.

Deposit type

• Sandstone hosted

Summary:

Uranium mineralization in the Grants Mineral Belt of New Mexico is sandstone-hosted as defined in the “World Distribution of Uranium Deposits (UDEPO) with Uranium Deposit Classification”, (IAEA, 2009). Regionally mineralization is termed primary or re-distributed based on the character and morphology of the mineralization. Re-distributed mineralization is typically roll front type. Primary deposits are typically tabular and range in size from small pods a few feet in width and length to bodies several tens of feet thick, several hundred feet wide and several thousand feet long. The deposits tend to occur in clusters and many form distinct trends that are parallel to the sedimentary trend (Fitch, 1980; Turner-Peterson, 1986; Sandford, 1992).

Uranium occurs mostly as coffinite and uraninite in tabular primary mineralization, and mostly as uraninite in C-shaped or roll fronts in the redistributed mineralization. Primary mineralization is generally associated with finely disseminated carbon and indistinct organic matter, known as humates. Humates are presumed to have formed from the breakdown and dissolving of vegetal matter and redeposition in the mineralized zones. The redistributed mineralization is typically primary mineralization that has been redissolved and moved farther down dip and redeposited in the form of C-shaped roll fronts. Mineralization occurs in stream channel bottoms and margins in straight channels and feeder channels, meanders, and overflow areas. Pyrite and jordisite (black, soft molybdenum mineral, MoS2) are frequently associated minerals in the arkosic sandstone host rock. The mineralization is found as coating on the sand grains and as filling in the interstices between grains. The interstices are also filled with very fine kaolin and calcium carbonate. The humates and jordisite, when present, give the mineralized rocks their dark gray to black color.

The mineralized host within the project is primarily hosted in the lower two sand units, Sands C and D, of the Westwater Canyon member of the Jurassic Morrison Formation. Lessor mineralization is present in Sand B but was not well enough defined for inclusion in the mineral resource estimate. The mineralization occurs mostly as tabular primary deposits (Livingston, 1980) with lesser amounts as roll fronts. Much of the mineralization is associated with disseminated carbon matter (humates), especially the tabular type of mineralization.

Mining Methods

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Comminution

Crushers and Mills

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Processing

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Commodity Production

Operational metrics

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Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Feb 21, 2026
.......................	.......................		Jun 9, 2021
.......................	.......................		Jun 9, 2021