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United States
Sheep Mountain Project (Congo Project, Sheep Project)

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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
Fax303.974.2141
EmailEmail
WebsiteWeb
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Overview

StatusTemporary Suspension
Mine TypeOpen Pit & Underground
Commodities
  • Uranium
  • U3O8
Mining Method
  • Truck & Shovel / Loader
  • Room-and-pillar
  • Cemented backfill
Processing
  • Solvent Extraction
  • Sulfuric acid (reagent)
  • Acid leach
  • Heap leach
Mine Life12 years (as of Jan 1, 2020)
The Sheep Mountain Project consists of permitted open pit and underground extraction components and a planned processing facility to process extracted mineralized material which has not yet been permitted.

Submittal of the license application to the WDEQ-LQD for a heap leach processing facility at the site is on hold pending the Company’s evaluation of off-site processing options for this project. The project is currently on standby, pending completion of the evaluation of the processing options for the Project and improvement in market conditions.


Owners

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

Deposit Type

  • Sandstone 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
  • Room-and-pillar
  • Cemented backfill


Summary:

The project consists of two distinct and independent mining areas, the Congo Open Pit and the Sheep Underground, with common processing on mine material via a heap leach recovery facility. The currently planned mine life of the open pit is 12 years with an additional four years allotted for mine closure and reclamation. The currently planned mine life of the underground is 12 years which includes one year for development and 11 years mine production.

Congo Open Pit
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.

Due to the nature and extent of mineralization, the Congo Pit is essentially a single open pit that will be developed sequentially to accommodate the desired mine production and allow for internal backfilling. This sequential schedule and internal backfilling reduces the amount of double- handling of mine waste material required to backfill and reclaim the mined pit during the life of the mine.

Sheep Underground
The Sheep Underground mine has operated as a conventional underground mine on three separate occasions. The historic mining method was a modified room and pillar method using conventional techniques. Jacklegs were used to drill out the rounds and underground track haulage was used to transport the mined material to Shaft No. 1.

The mining method proposed going forward is also a conventional method using a modified room and pillar method but utilizing modern mining equipment such as jumbo drills and scooptrams for haulage. A new double entry decline will be constructed starting at the Paydirt Pit and ending below the deposit. Haulage from the mine will be accomplished via a 36-inch conveyor within one of the double declines. The existing shafts will be used for ventilation purposes only, with exhaust fans mounted at both locations. If the existing borehole ventilation shafts can be rehabilitated, they will be used as intake shafts. The deposit is comprised of 16 mineralized zones with a total thickness of approximately 350 feet. The deposit will be mined primarily from bottom to top.

Sheep Underground mining method summary:
- Development drifts will utilize dual openings. 10 by 15-foot openings will be used for haulage, and 8 by 10-foot openings will be used for transportation and ventilation.
- Mining panels will utilize multiple entries depending on the width of the zone. Entries will be approximately 12 feet wide, minimum of 6 feet high and averaging 7 feet high.
- Crosscuts will be placed on 100-foot centers.
- Mining will be completed by advance and retreat methods.
- Advance mining is accomplished by driving approximately 12 by 7-foot drifts within zones meeting cutoff grade. Multiple drifts will be driven parallel to one another with crosscuts on 100-foot centers. The parallel drifts will be 27 feet apart on centerline.
- This will leave a pillar with a dimension of approximately 15 feet wide and 90 feet long. On retreat mining, these pillars are removed if they meet cutoff grade.
- Ventilation will be provided by two 500 HP exhaust fans at Sheep No. 1 Shaft and Sheep No. 2 Shaft assisted by multiple portable face fans. Ventilation requirements for this mine are approximately 220,000 cubic feet of air per minute. Fresh air must be directed across each of the working faces and through the drifts designed for personnel transport.
- Mine ventilation which meets standards for removal of diesel emissions will also provide adequate ventilation for radon gas given the anticipated mining grades.
- Blasting of the rock, both for development and mining, will be done by drilling 8 to 12-foot blast holes using jumbo drilling rigs and filling the blast holes with ANFO (Ammonium Nitrate and Fuel Oil).
- Haulage from the working faces to the haulage conveyor or to the loading chutes will utilize 4 cubic yard scooptrams which load, haul and dump mined product.
- Mined product will be hauled through development drifts directly to the decline or to two loading chutes to transport the mined product to the decline. The decline will be equipped with a 36-inch conveyor which will take the mined product and waste, when necessary, to the surface. Haulage drifts will be kept as level as practicable, not exceeding ten percent grades.
- The roof and sidewalls in the drifts, both mining and development, will be supported with rock bolts and wire mesh. A rock bolting machine which can drill holes both vertically and horizontally will place the rock bolts on approximately four-foot centers as the drifts advance. There will be overlap of bolting and wire mesh between each round to ensure proper ground control coverage.
- Boreholes to construct loading chutes or to aid in ventilation will be drilled using raised boring methods.
- Waste rock, whenever possible, will be placed in mined out workings to minimize haulage of hauling the mined waste to the surface. When it is not possible, the waste will be taken to the surface where it will be stockpiled for final reclamation.

Ground Support will, in addition to bolting and meshing, include:
- In areas that do not have mineralized zones directly above them temporary support will be placed such as timbers or concrete cylinders, and the pillars will be removed allowing the roof to ultimately fail.
- In areas with mineralized pods directly overhead, the adjoining rooms will be backfilled using a cemented backfill. The backfill will be a combination of waste rock mixed with three and one- half percent cement and three and one-half percent fly ash. This backfill will exceed the strength of the native rock and prevent the roof from failing and diluting the mineralized pods above them.


Crushing and Grinding


Processing

  • Solvent Extraction
  • Sulfuric acid (reagent)
  • Acid leach
  • 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 ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Uranium (U3O8) Recovery Rate, % 91.9
Uranium (U3O8) Head Grade, % 0.12

Projected Production:

CommodityUnitsAvg. AnnualLOM
Uranium (U3O8) k lbs 1,40016,875
All production numbers are expressed as yellow cake.

Operational Metrics:

Metrics
Ore tonnes mined, LOM  ......  Subscription required
Annual production capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

Reserves at February 21, 2020:

CategoryTonnage CommodityGradeContained Metal
Probable 7,453 k tons U3O8 0.123 % 18,365 k lbs
Indicated 11,663 k tons U3O8 0.12 % 27,935 k lbs

Commodity Production Costs:

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

Operating Costs:

Units2020
OP mining costs ($/ton mined) USD 25.8 *
UG mining costs ($/ton mined) USD  ......  Subscription required
Combined mining costs ($/ton mined) USD  ......  Subscription required
Processing costs ($/ton milled) USD  ......  Subscription required
Total operating costs ($/ton milled) USD  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

2020 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
OP/UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 93.5
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 7% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 7% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Heavy Mobile Equipment:

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.

Staff:

Total WorkforceYear
Subscription required 2020

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.

Subscription required - Subscription is required.

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