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United States
Crow Butte Mine

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 Location:
6 km SE from Crawford, Nebraska, United States

  Address:
86 Crow Butte Road P.O. Box 169
Crawford
Nebraska, United States
69339-0169
Phone  ...  Subscription required
Fax(308)-665-2341
WebsiteWeb
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Overview

StatusCare and Maintenance
Mine TypeIn-Situ
Commodities
  • Uranium
Mining Method
  • Solution mining
Production Start...
Cameco’s operations in the United States, Crow Butte and Smith Ranch-Highland, are not currently producing as the decision was made in 2016 to curtail production and defer all wellfield development.


Owners

Source: p. 164
CompanyInterestOwnership
Cameco Corp. 100 % Indirect
Cameco owns 100% of Crow Butte through a wholly-owned subsidiary Crow Butte Resources, Inc.

Contractors

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Deposit Type

  • Sandstone hosted


Summary:

The Crow Butte uranium deposit is a sandstone-type, roll-front uranium deposit, and is contained within the Chadron sandstone, at the base of the Oligocene Chadron Formation.

The Chadron uranium deposits are roll-front deposits formed by the precipitation of uranium from uranium- rich, oxidizing waters as they moved into or through a reducing aquifer. Because the uranium was transported by, and precipitated from, groundwater, an interpretation of the development of the groundwater system through geologic time has been made to identify factors controlling uranium accumulation.

Petrographic data (e.g., U-bearing matrix at grain contacts) indicate that U mineralization occurred before lithification of the sandstone. Dissolution of abundant rhyolitic volcanic ash produced U- and Si-rich ground waters that were channeled through permeable sandstones at the base of the Chadron by relatively impermeable overlying and underlying beds. The precipitation of early authigenic pyrite created a reducing environment favorable for precipitation and accumulation of U in the basal sandstone. The U has remained in a reduced state, as evidenced by the fact that the unoxidized minerals, coffinite and uraninite, comprise the bulk of the ore. At least some U and V remain bound to amorphous volcanic material and/or smectite rather than existing as discrete mineral phases.

The Chadron sandstone, which hosts the Crow Butte deposit, consists of coarse-grained, cross-b ........


Mining Methods

  • Solution mining


Summary:

Uranium is recovered at Crow Butte through the in situ process. There is no waste rock or tailings. Uranium is extracted from underground by pumping native groundwater mixed with small amounts of oxygen and bicarbonate (baking soda) into the ore zone. The uranium is freed from a sandstone formation and pumped to the surface for processing.

A solution of water, oxygen and baking soda is injected into the ore body, which causes the uranium to detach from the sand and flow toward the production well.

It is then pumped to the surface, where the uranium is removed and the water is injected back into the ground to repeat the cycle.

Monitor wells are placed inside and outside the production area.

These wells make sure the drinking water hasn't been affected and the solution hasn't migrated away from the production area.


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2017201620152014
Uranium M lbs 0.10.30.40.6
All production numbers are expressed as U3O8.

Operational Metrics:

Metrics20222021202020192018
Annual production capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required2 M lbs of uranium U3O82 M lbs of uranium U3O8
Subscription required - Subscription is required.

Reserves at December 31, 2022:

CategoryTonnage CommodityGradeContained Metal
Measured 1,558 kt U3O8 0.19 % 6.6 M lbs
Indicated 939.3 kt U3O8 0.35 % 7.3 M lbs
Measured & Indicated 2,497 kt U3O8 0.25 % 13.9 M lbs
Inferred 531.4 kt U3O8 0.16 % 1.8 M lbs



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 22, 2023
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Management Discussion & Analysis 2022
Other 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2017
Form 40-F 2016
Fact Sheet 2015
Form 40-F 2015
Other 2007
Other 2007
Other 2005
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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