South Dakota

Dewey Burdock Uranium Project

Project Highlights

Project Details

The Dewey Burdock Uranium Project is located in South Dakota and is a high-grade in-situ recovery deposit. Azarga Uranium owns 100% of the Dewey Burdock Uranium Project.


The Company’s 100% owned Dewey Burdock Uranium Project is an in-situ recovery (“ISR”) uranium project located in the Edgemont uranium district, in South Dakota, USA. Through property purchase agreements, mining leases and/or mining claims, the Dewey Burdock Uranium Project is comprised of approximately 12,613 surface acres and 16,962 net mineral acres. The Dewey Burdock Uranium Project is the Company’s initial development priority.


Uranium was found in the Edgemont district, South Dakota, in 1952. Early discoveries were at surface. Later drilling revealed deeper uranium deposits. In the mid 1970’s, Tennessee Valley Authority (TVA) bought a major interest in the area and made Dewey Burdock their main exploration target. Silver King Mines, project operator for TVA, had explored the property with over 4,000 drill holes by 1986, when drilling was suspended.

With the ongoing depressed uranium market price, in 1988 TVA relinquished their leases and mining claims in the area and the original land/claim owners took over their old mining claims or retained their mineral rights.

In 2005, Denver Uranium Company, LLC (DU) acquired leases of federal claims, private mineral rights covering 11,180 acres and private surface rights covering 11,520 acres in the Dewey-Burdock area. Further to its initiative to consolidate the Dewey-Burdock uranium resource, Azarga also entered into a binding property purchase agreement with Energy Metals Corp. (EMC) on November 18, 2005 whereby Azarga acquired a 100% interest in 119 mineral claims covering approximately 2,300 acres in the Dewey-Burdock area. Azarga consolidated the Company’s property position through acquisition of various adjacent properties.

Regional Geology

The Dewey Burdock deposit occurs in the Fall River and Lakota Formations of the lower Cretaceous age. The Fall River and Lakota formations consist of permeable sandstones deposited in a major sand channel system. The uranium occurs in the sandstones as classic roll front deposits favorable to ISR mining methods.

Summary of Estimated Mineral Resources

In December 2020, the Company filed an amended and restated NI 43-101 compliant independent Technical Report and preliminary economic assessment (“PEA”) for the Dewey Burdock Project prepared by Woodard & Curran and Rough Stock Mining Services (the “Dewey Burdock PEA”) with an effective date of December 3, 2019.

Dewey Burdock Project ISR Mineral Resource Estimate
 Measured ResourcesIndicated ResourcesMeasured plus Indicated ResourcesInferred Resources
Average grade (% U3O8)0.1320.0720.1160.055
Average thickness (feet)5.565.745.655.87
Average grade-thickness (“GT”)0.7330.4130.6550.324
Uranium (pounds) at a 0.20 GT cut-off14,285,9882,836,15917,122,147712,624

Note: mineral resources that are not mineral reserves do not have demonstrated economic viability.

The Dewey Burdock PEA resulted in a pre-income tax NPV of $171.3 million at a discount rate of 8% and an IRR of 55% compared to a post-income tax NPV of $147.5 million at a discount rate of 8% and an IRR of 50%.  The Dewey Burdock PEA post-income tax calculations do not include a corporate level assessment of income tax liabilities; taxes have only been calculated at the Dewey Burdock Project level. The estimate of income tax at the corporate level is subject to a number of additional considerations that have not been factored in when calculating income taxes at the project level, including, but not limited to, the capital structure to finance the Dewey Burdock Project, which has not yet been determined and loss carry forwards available at the corporate level.

The Dewey Burdock PEA estimated uranium prices of $55/lb U3O8, direct cash operating costs of $10.46 per pound of production and royalties and local taxes (excluding property tax) of $5.15 per pound of production.  The total pre-income tax cost of uranium production is estimated to be $28.88 per pound of production.  Income taxes are estimated to be $3.39 per pound of production.

Initial capital expenditures are estimated at $31.7 million.  The Dewey Burdock Project is forecast to produce 14.3 million pounds of U3O8 over its 16 years of production and the projected cash flows of the Dewey Burdock Project are expected to be positive in the second year of production, two years after the commencement of construction.

Details of the assumptions and parameters used with respect to the Dewey Burdock PEA, including information on data verification, are set out in the “NI 43-101 Technical Report Preliminary Economic Assessment, Dewey-Burdock Uranium ISR Project, South Dakota, USA”, dated December 22, 2020, with an effective date of December 3, 2019, by Yovich, M., PE and S. Cutler, PG, a copy of which is available under the Company’s profile at The Dewey Burdock mineral resource estimate includes resources in the measured, indicated and inferred classes. However Yovich and Cutler (2020) concluded the resources in the inferred class are considered too speculative geologically to have the economic considerations to be included in the PEA. The Dewey Burdock PEA is preliminary in nature; There is no certainty that the Dewey Burdock PEA will be realized. Mineral resources that are not mineral reserves do not have demonstrated economic viability.

View Dewey-Burdock Uranium Project Technical Report

Summary of Amenability for ISR Mining

Investigations have been conducted to determine the ISR amenability of the Dewey Burdock deposit, including both ground water conditions and leachability of the mineralization.  Analysis of the Fall River and Lakota hydro-stratigraphic unit, host for the mineralization suggests that a range of  ISR well pumping rates is suitable within the hydro-stratigraphic unit’s potential, and the unit’s transmissivity provide favorable conditions for ISR mining techniques. Azarga completed significant work to characterize the groundwater system at the Dewey-Burdock project to demonstrate favorable hydrogeologic conditions for ISR methods, as well as mine planning and permitting purposes. Work completed by Azarga and their consultants includes monitor and pumping well construction, hydro-stratigraphic unit testing, groundwater sampling, and completion of regional and well field scale groundwater models. 

Amenability to leaching was evaluated using ambient bottle roll tests with a sodium bicarbonate (NaHCO3) and hydrogen peroxide (H2O2) charged water solution. Azarga found the results of these preliminary leach tests indicate the uranium deposits at Dewey-Burdock appear to be readily mobilized in oxidizing solutions, and potentially well suited for ISR mining.

Regulatory and Permitting

The Company’s Dewey Burdock Project received its Source and Byproduct Materials License SUA-1600 on April 8, 2014 from the Nuclear Regulatory Commission (“NRC”), covering 10,580 acres. The Company controls the mineral and surface rights for the area pertaining to the NRC license.

Subsequently, in December 2020, a petition for review of contentions previously resolved in favor of the Company and the NRC staff was filed by certain petitioners with the United States Court of Appeals for the District of Columbia Circuit (the “DC Circuit Court”), which is the next court in line of jurisdiction. The Company’s response to the petition for review is due June 10, 2021. Despite any appeal, the current full effectiveness of the Company’s NRC license for its Dewey Burdock Project remains in place and the Company does not expect this petition for review to be successful. The Company has previously prevailed at both the Atomic Safety and Licensing Board and the NRC Commission on these issues.

In November 2020, the Environmental Protection Agency (“EPA”) issued the Company their final Class III and Class V Underground Injection Control (“UIC”) permits, and associated aquifer exemption, for the Dewey Burdock Project. Subsequent to the permits being issued, the Class III and Class V UIC permits were appealed to the Environmental Appeals Board (the “EAB”). The aquifer exemption was appealed to the United States Court of Appeals for the Eight Circuit (the “Eighth Circuit”). The EAB proceeding has been stayed until May 2021 and the Company’s next filing is due May 18, 2021. Further, the proceeding before the Eighth Circuit has been held in abeyance pending the resolution of the EAB proceeding. The Company does not expect either of these appeals to be successful and is now focused on obtaining the required state permits for the Dewey Burdock Project in conjunction with resolving these appeals.

The Company submitted applications to the South Dakota Department of Agriculture and Natural Resources (“DANR”) in 2012 for its Groundwater Discharge Plan (“GDP”), Water Rights (“WR”) and Large Scale Mine Plan (“LSM”) permits. All permit applications have been deemed complete and have been recommended for conditional approval by the DANR staff. The GDP and WR permits are subject to hearing with public participation. The hearing commenced on October 28, 2013 and continued through November 25, 2013, at which point it was determined that the hearing will resume once the NRC and EPA have ruled and set the federal surety. The LSM permit has been finalized subject to continuation of a hearing before the Board of Minerals and Environment, which commenced the week of September 23, 2013 and continued through November 5, 2013, at which point it was determined that the hearing will resume once the NRC and EPA have ruled and set the federal surety. The Company is focused on recommencing the hearing process for the GDP, WR and LSM permits now that the EPA permits and NRC license have been issued.

The Company continues to be in compliance with existing permitting and licensing requirements. Prior to commencing construction and operations at the Dewey Burdock Project, the Company requires three state permits to be issued by the DANR, the EAB appeal to be denied or resolved in favour of the Company, certain pre-operational conditions under the Company’s permits and licenses to be satisfied and the development and implementation of mitigation plans for protection of cultural resources under the programmatic agreement.

What’s Next?

In parallel with advancing the Dewey Burdock Project on the permitting front, the Company will continue to evaluate project-financing options, with a view to having a funding solution in place prior to or concurrent with the finalization of permits.

Qualified Person

John Mays, P.E. and Chief Operating Officer for Azarga Uranium is a Qualified Person under NI 43-101 – Standards of Disclosure for Mineral Projects and is responsible for and has approved the technical disclosure on this website.

ISR Uranium Mining