United States

Shirley Basin Project

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Mine TypeIn-Situ
  • Uranium
Mining Method
  • Solution mining
Production Start... Lock
Mine Life9 years (as of Jan 1, 2021)
ShapshotShirley Basin is fully permitted and construction-ready with a licensed wellfield capacity of one million pounds U3O8 per year. As of October 2023, the Ur-Energy Board estimates it will take up to 24 months to complete all procurement, development activities, and construction of the satellite facility and associated first mine unit to initiate production. This estimate is based on the long lead times seen for critical equipment; especially for electrical equipment. The decision to proceed with the construction of the satellite and first mine unit for production operations will be considered on an ongoing basis as the uranium market and contract book evolve.

The Ur-Energy Board is initiating procurement of long-lead items for the Shirley Basin Project and will advance other activities in the field, with the objective to shorten the time for construction and ramp up when the "go" decision is made for construction.


Ur-Energy Inc. 100 % Indirect
Ur-Energy USA has wholly-owned subsidiary Pathfinder Mines Corporation, a company incorporated under the laws of the State of Delaware, which holds the Shirley Basin and Lucky Mc properties in Wyoming.



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Deposit type

  • Unconformity related
  • Sandstone hosted


Uranium mineralization identified throughout the District occurs as roll front-type deposits.

In the Project area, the primary hosts for uranium mineralization are arkosic sandstones of the Eocene-age Wind River Formation. This formation was unconformably deposited on gentlydipping shales and sandstones of the Cretaceous-age Niobrara and Frontier Formations. The White River Formation unconformably overlies the Wind River Formation and outcrops on the surface throughout most of the Project, with thicknesses ranging from a thin veneer in the FAB Resource Area to over 250 ft. in Area 5,

The Wind River sediments in the Project area were deposited as part of a large fluvial depositional system. The lithology of the Wind River Formation is characterized by thick, medium to coarse-grained, arkosic sandstones separated by thick claystone units. Sandstones and claystones are typically 20 - 75 ft. thick. Minor thin lignite and very carbonaceous shale beds occur locally. These fluvial sediments are located within a large northwest-trending paleochannel system with a gentle 1° dip to the north,

The average thickness of the Wind River Formation within the Project area is approximately 230 ft.

The Lower Sand represents the basal sand unit of the Wind River Formation and in places lies directly above the underlying Cretaceous formations. The Main Sand typically lies approximately 15 - 25 ft. above the Lower Sand. Locally, the two sands merge where the intervening claystone unit is absent. Typical thickness of the Lower Sand ranges from 25 - 50 ft. and that of the Main Sand from 40 - 75 ft. Less dominant sands are common within the Wind River Formation. One in particular has been referred to as the Upper Sand and is present within much of the FAB Trend, lying approximately 25 ft. above the Main Sand. Claystone units are normally at least 10 ft. thick and commonly are 20 - 50 ft. thick.

The average depth to the top of the Main Sand in the FAB Trend is approximately 270 ft. and the average depth to the base of the Lower Sand is 400 ft. Area 5 is down-dip; therefore, the units are slightly deeper. The average depth to the top of the Main Sand in Area 5 is approximately 360 ft. and the average depth to the base of the Lower Sand is 490 ft.

Significant Mineralization
All uranium mineralization at the Project occurs as roll front deposits. Virtually all significant mineralization, including the past production, is hosted by the Main Sand or the Lower Sand. Limited uranium mineralization has also been encountered in the less pervasive upper Wind River Formation sandstones and in sandstones of the overlying White River Formation. These upper sandstones, however, are viewed as marginal targets and evaluation to date has been limited.

Each of the primary host sands is occupied by a regional roll front alteration system which closely follows the depositional patterns established by Wind River-age fluvial paleo channels. The alteration systems, in turn, develop multiple stacked roll fronts at their terminal ends or lateral edges, such that the Main Sand has as many as ten distinct roll fronts and the Lower Sand up to five roll fronts.

The FAB Trend is the primary target for potential uranium ISR. Mineralization occurs primarily in the Main Sand and represents an arcuate trend. The trend represents a composite of multiple stacked roll front mineral horizons spanning a length of approximately 11,000 ft. (2 miles) and varying in width from 250-1,000 ft. Mineralization occurs within a 200-ft. depth interval, ranging from 200-400 ft. Within a given roll front, mineralization exhibits strong horizontal continuity parallel to the orientation of the reduction-oxidation (redox) interface.

Mineralization in Area 5 is also a target for ISR. Mineralization in Area 5 is hosted in both the Main and Lower Sands near the northern terminus of those regional alteration tongues. Resources occur in two loosely defined, north-south oriented trends which are located along the lateral flanks of the alteration tongues. The western flank contains the highest occurrences of mineralization. The eastern trend is less defined and holds fewer resources. The western trend is approximately 3,000 ft. long by 1,000 ft. wide, and the eastern trend is approximately 2,500 ft. long by 500 ft. wide. Together, the two trends represent a resource area approximately 3,000 ft. long by 2,000 ft. wide. Similar to the FAB Trend, each sand hosts multiple stacked roll fronts. Depth to mineralization in the Main Sand in Area 5 ranges from 380-500 ft. and from 470-530 ft. in the Lower Sand. Geometry of the individual roll fronts in this area is very similar to that described above for the FAB Trend.



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Mining Methods


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Crushers and Mills

Milling equipment has not been reported.



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CommodityUnitsAvg. AnnualLOM
Uranium lbs 1,000,0006,358,337
All production numbers are expressed as U3O8.

Production Costs

Cash costs U3O8 USD 000
All-in costs U3O8 USD 000
Assumed price U3O8 USD 000
* According to 2021 study / presentation.

Project Costs

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscribe
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Sustaining CapEx $M USD  ......  Subscribe
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Well Field OpEx $M USD  ......  Subscribe
Processing OpEx $M USD 24.7
Refining and transportation $M USD  ......  Subscribe
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Gross revenue (LOM) $M USD  ......  Subscribe
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After-tax Cash Flow (LOM) $M USD  ......  Subscribe
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Pre-tax NPV @ 10% $M USD  ......  Subscribe
Pre-tax NPV @ 8% $M USD  ......  Subscribe
After-tax NPV @ 5% $M USD  ......  Subscribe
After-tax NPV @ 10% $M USD  ......  Subscribe
After-tax NPV @ 8% $M USD  ......  Subscribe
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Heavy Mobile Equipment


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Mine Management

Source Source
Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 16, 2024
....................... Subscription required ....................... Subscription required ........... Subscription required ........... Subscription required Subscription required Jan 16, 2024


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