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United States
Congo Project (Sheep Mountain Complex)

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 Location:
11 km S from Jeffrey City, Wyoming, United States

  Project Contacts:
225 Union Boulevard Suite 600
Lakewood
Colorado, United States
80228
Phone  ...  Subscription required
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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Uranium
Mining Method
  • Truck & Shovel / Loader
Processing
  • Sulfuric acid (reagent)
  • Solvent Extraction
  • Heap leach
Mine Life12 years (as of Jan 1, 2020)
The Sheep Mountain Project includes the Congo Pit, comprised of the Congo, North Gap, and South Congo areas.


Owners

Source: p. 18
CompanyInterestOwnership
Energy Fuels Inc. 100 % Indirect
Energy Fuels Wyoming Inc. 100 % Direct
The Sheep Mountain Project (Congo Pit and Sheep Underground) held by the Company’s (Energy Fuels Inc.) subsidiary Energy Fuels Wyoming Inc.

Deposit Type

  • Sediment-hosted


Summary:

Within the Sheep Mountain Project area, uranium mineralization is contained in the lower to middle Eocene Battle Spring Formation. The Battle Spring Formation, consisting of upper and lower members (designated the “A” for the lower and “B” for the upper), is a fluvial deposit. Mineralization is hosted by the Battle Spring Formation and has been described extensively since the 1960s and has been termed a ‘Wyoming Roll Front System’. These deposits are often organic-rich, fine grained lenses in tabular, or “roll front”, configurations. The uranium mineralization occurs primarily in the lower member of the Battle Spring Formation (Stephens, 1974).

Mineralization occurs throughout the lower A Member of the Battle Spring Formation and is locally up to 1,500 feet thick. The upper B Member is present only in portions of the project and may be up to 500 feet thick. The A Member of the Battle Spring is folded. The folding is considered to have focused mineralization in the troughs of the synclines (Stephens, 1974).

Although arkosic sandstone is the preferred host, uranium has been extracted from all lithologies. Grade and thickness are extremely variable depending on whether the samples are taken from the nose or the tails of a roll front. Typically the deposits range from 50 feet to 200 feet along strike, 5 feet to 8 feet in height, and 20 feet to 100 feet in width. Deposits in the Sheep Mountain area occur in stacked horizons from 7,127 feet elevation down to 6,050 feet elevation (Stephens, 1964)


Mining Methods

  • Truck & Shovel / Loader


Summary:

The current mine design for the Congo Pit includes typical highwall heights in the range of 100 to 400 feet, and reaches a maximum depth of 600 feet in localized areas in the southeast pit corner. The open pit design employs similar design parameters and mining equipment configurations to those used successfully in past Wyoming conventional mine operations. Highwall design is based upon the performance of past projects in the Sheep Mountain and Gas Hills districts, and includes an average highwall slope of 0.7:1, which reflects the average of a 10-foot bench width and 50-foot wall at a 0.5:1 slope.


Crushing and Grinding


Processing

  • Sulfuric acid (reagent)
  • Solvent Extraction
  • Heap leach

Flow Sheet: Subscription required

Summary:

The planned uranium recovery method at the Sheep Mountain Project is conventional heap leaching which includes: the mobilization of uranium values into solution from the mined material stacked on the heap pad via acid leaching, delivery of uranium rich solutions to a recovery plant (mill), and concentration of the uranium to a saleable product via solvent extraction, and precipitation systems that will be capable of producing up to 2 million lbs U3O8 annually.

Uranium recovery at Sheep Mountain will include the following processes:
- stacking of mined material on the heap leach pad;
- application of leach solution;
- collection of pregnant leach solution (PLS);
- filtering of sand and fines from PLS;
- solvent extraction to concentrate and purify the extracted uranium;
- precipitation of uranium oxide, “yellowcake”;
- washing, drying, packaging, storage and loading of yellowcake product;
- management of process solid and liquid waste a ........


Combined production numbers are reported under Sheep Mountain Complex

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

Reserves at February 28, 2020:
Indicated Mineral Resource - GT cutoff: Open Pit GT 0.10 (2 feet of 0.05% eU3O8)
Probable Mineral Reserves - GT cutoff: Open Pit GT 0.10 (2 feet of 0.05% eU3O8)

CategoryTonnage CommodityGradeContained Metal
Probable 3,955 k tons U3O8 0.115 % 9,117 k lbs
Indicated 6,116 k tons U3O8 0.122 % 14,903 k lbs

Commodity Production Costs:

CommodityUnitsAverage
Assumed price Uranium (U3O8) USD  ......  Subscription required *
* According to 2020 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2020
OP mining costs ($/ton mined) USD 25.8 *
* According to 2020 study.

2020 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
OP OpEx $M USD  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of February 28, 2020:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 28, 2020
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Corporate Presentation 2017
Form 10-K 2017
Form 10-K 2016
Form 10-K 2015
Pre-Feasibility Study Report 2012
Subscription required - Subscription is required.

Aerial view:

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