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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
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeIn-Situ
Commodities
  • Uranium
  • U3O8
Mining Method
  • Solution mining
Processing
  • Elution
  • In-Situ Recovery (ISR)
  • Ion Exchange (IX)
As a result of Cameco 2016 decision, production at the US operations ceased in 2018. Cameco expects ongoing cash and non-cash care and maintenance costs to range between $14 million (US) and $16 million (US) for 2020.


Owners

Source: p. 147
CompanyInterestOwnership
Cameco Corp. 100 % Indirect
Crow Butte Resources, Inc. 100 % Direct

Deposit Type

  • Sandstone


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.

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-bedded sandstone, with thin lenses of gravel-size conglomerate and interbedded clay layers. The sandstone is composed of 65% quartz, 25% feldspar and 10% rock fragments. The sediments also contain up to 30% air-fall ash in places.


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.


Crushing and Grinding


Processing

  • Elution
  • In-Situ Recovery (ISR)
  • Ion Exchange (IX)

Flow Sheet: Subscription required

Summary:

The uranium recovery process utilizes the following steps:
* Loading of uranium complexes onto an ion exchange resin;
* Reconstitution of the leach solution by addition of carbonate and an oxidizer;
* Elution of uranium complexes from the resin; and
* Drying and packaging of the uranium.

Recovery of uranium takes place in the ion exchange columns. The uranium bearing leach solution enters the column and as it passes through, the uranium complexes in solution are loaded onto the ion exchange (IX) resin in the column.

The now barren leach solution passes from the ion exchange columns to be reinjected into the formation. The solution is refortified with sodium and carbonate chemicals, as required, and pumped to the wellfield for reinjection into the formation.

Once the majority of the ion exchange sites on the resin in an ion exchange column are filled with uranium, the column is taken off stream. (In the current main process plant, t ........


Production:

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

Operational Metrics:

Metrics2019201820162015
Annual production capacity  ......  Subscription required  ......  Subscription required2 M lbs of uranium U3O82 M lbs of uranium U3O8
Subscription required - Subscription is required.

Reserves at December 31, 2019:
Mineral resources were not update in 2019.

CategoryTonnage CommodityGradeContained Metal
Measured 1,601 kt U3O8 0.19 % 6.7 M lbs
Indicated 939.3 kt U3O8 0.35 % 7.3 M lbs
Inferred 531.4 kt U3O8 0.16 % 1.8 M lbs


Heavy Mobile Equipment:

Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 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.

Aerial view:

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