Noble Plains Uranium Delivers Maiden Resource at Flagship Duck Creek Project in the Powder River Basin, Wyoming
Noble Plains Uranium Delivers Maiden Resource at Flagship Duck
Creek Project in the Powder River Basin, Wyoming
Highlights
• Maiden resource estimate prepared in accordance with NI 43 -101 standards of 5.32 million
pounds Indicated and 1.04 million pounds Inferred — delivered just eight months after closing
the Project acquisition.
• Beat the upper limit of the prior Exploration Target by every key metric: a 30% increase in grade
and a 40% increase in GT (grade × thickness) versus the upper limit of the Exploration Target over
the mineralized zone in WWC's August 2025 Duck Creek Technical Report.
• Only half the story told so far: the 2025 drill program covered just 2.5 miles of an approximately
5.25-mile mineralized trend , leaving roughly 2.75 miles of largely untested strike on the
Company's expanded claim position.
• Historical data validated: the recently completed 148-hole drill program successfully confirmed
the historical Kerr-McGee intercept data that underpinned the Project's acquisition thesis.
• Additional drilling planned for 2026 aiming to convert the Exploration Target into resources ,
extend mineralized strike length, and test the deeper Fort Union Formation.
• Prime real estate : Duck Creek sits in one of North America's most prolific uranium districts,
flanked by projects owned by Cameco Corporation (“Cameco”) and Uranium Energy Corp.
("UEC"), two of the largest uranium companies in North America.
April 23, 2026 – Vancouver, British Columbia – Noble Plains Uranium Corp. (TSX-V: NOBL, OTCQB: NBLXF,
FSE: INE0) (" Noble Plains " or the " Company"), a U.S. -focused uranium exploration and development
company, is pleased to announce a maiden mineral resource estimate prepared in accordance with
National Instrument 43-101(“NI 43-101”) standards for its flagship Duck Creek Project (" Duck Creek" or
the "Project") in Wyoming's Powder River Basin. The estimate, prepared by WWC Engineering (" WWC")
of Sheridan, Wyoming, follows the Company's successful drilling campaign and represents a foundational
milestone for Noble Plains.
"Today's resource announcement is a defining moment for Noble Plains and, importantly, one we've
delivered in well under a year from the day we closed on Duck Creek. Our thesis was simple : take a
historically drilled, brownfield uranium asset in one of the best uranium addresses in North America,
execute with discipline and efficiency to convert it into compliant pounds. With a maiden resource now
on the books, we've done exactly that and, in the process, have been able to outperform our own
exploration target on grade, thickness, and total pounds,” stated Drew Zimmerman, CEO of Noble Plains.
“What I want investors to take away is that this resource is a starting point, not a finish line. We've drilled
roughly half of the mineralized trend on our expanded land package, we have an additional Exploration
Target to grow into, and we still have an entirely separate formation in the Fort Union, that we believe
could host significant additional potential. Duck Creek sits between projects held by Cameco and UEC,
two of the largest uranium companies in North America, and with uranium demand being driven by a new
nuclear renaissance, AI and data center power demand build-out, and a clear policy push for domestic
U.S. supply, we believe the timing for a scalable American uranium project could hardly be better. This
resource is another milestone in our plan to build a meaningful, resource -backed uranium platform and
we intend to keep stacking milestones."
Duck Creek Mineral Resource Estimate – as of 12 February 2026:
Resource
Classification
Average Grade
(%U3O8) Average GT Tons (000s) U3O8 (Mlbs)
Indicated 0.06 0.78 4,290 5.32
Inferred 0.09 1.16 839 1.04
Notes: ISR resources were determined using the GT Sum Contour Method and met the following criteria:
1. Based on grade cutoff of 0.02 0% eU 3O8, a grade x thickness (GT) cutoff of 0.2 0 GT and a o ne-foot minimum
intercept thickness.
2. Intercept data within the “E” Sand was combined and summed together to calculate a GT sum used for classified
resource calculations.
3. Indicated and Inferred mineral resources as defined in Section 1.2 of NI 43-101 (the CIM Definition Standards [CIM
Council, 2014]).
4. All reported resources occur below the static water table.
5. Average grades are calculated as weighted averages.
"The recently completed Duck Creek drill program focused on a 2.5 miles length of the mineralized trend
and was a huge success for the Company, delivering a 30% increase in the grade and a 40% increase in the
GT above the upper limit of the Exploration Target estimated in WWC's August 2025 Duck Creek Technical
Report,” stated Paul Cowley, COO of Noble Plains. "Significant upside remains on the approximately 2.75
miles of mineralized trend that have yet to be drilled on our expanded claim position, with the system
apparently continuing to both the north and south as evidenced by historic drill locations and a string of
shallow historic open pits from the 1970s and 1980s. It is on this basis that WWC defined an Exploration
Target alongside the maiden resource, providing a clear, data -supported roadmap for our 2026 drill
program. Equally encouraging, our 2025 drilling has already demonstrated that mineralization extends
below some of the shallow historic open pits , pointing to additional potential that was never pursued by
the historical operators. All of the foregoing pertains to the Wasatch Formation; beneath it, the Company
believes the Fort Union Formation represents a significant and largely untested opportunity for additional
uranium mineralization, effectively offering a third, independent growth vector at Duck Creek."
Furthermore, an Exploration Target for the Project is estimated at between 941 and 1,021 thousand tons
grading between 0.020% and 0.052% U₃O₈. The Exploration Target was prepared by WWC Engineering and
is based on historical Kerr-McGee drill hole intercept data and trend mapping covering approximately 2.75
miles of mineralized strike on the Company's expanded claim position that lies outside of, and along strike
from, the area covered by the maiden mineral resource estimate. The lower and upper limits of th e
tonnage and grade ranges were derived by applying the GT Sum Contour Method to the historical intercept
dataset, using the same parameters adopted for the maiden resource estimate: a grade cutoff of 0.020%
eU₃O₈, a GT cutoff of 0.20, and a one -foot minimum intercept thickness, with tonnage calculated using a
bulk density of 16.6 ft3/ton. The Exploration Target relates exclusively to the Wasatch Formation and does
not include any potential of the underlying Fort Union Formation.
The potential quantity and grade of the Exploration Target is conceptual in nature as exploration in these
areas is insufficient to estimate a mineral resource . It is uncertain if further exploration will result in the
Exploration Target being delineated as a mineral resource.
Figure 1 – Duck Creek Project
The NI 43 -101 resource estimate was prepared by WWC Engineering and authored by Christopher
McDowell, P .G., a registered member of the Society for Mining, Metallurgy & Exploration (Member No.
4311521) and a Qualified Person (“ QP”). The full technical report will be filed on SEDAR+ at
www.sedarplus.ca and Noble Plains website www.nobleplains.com within 45 days of the issuance of this
news release.
Data Verification
Canadian Institute of Mining Metallurgy and Petroleum (“ CIM”) Definition Standards require an
assessment of the historical and recent data used to classify resources at Duck Creek. This analysis
demonstrated that both the historical and recent data, as well as their interpretation, were developed by
reputable and experienced uranium exploration companies with appropriately qualified staff experienced
in uranium exploration.
Available data from historical drilling and exploration included drilling maps and intercept data sheets.
Historical mineral trend maps were cross -checked against intercept data sheets. Ten percent of the
tabulated mineral intercept values were reviewed and found to be valid.
Recent exploration includes a 148 -hole exploration drilling project completed by Noble Plains. Both
historical and recent data were used to complete the mineral resource estimate and the recent drilling
data were also used to verify the historical data. Numerous holes were drilled in 2025 that were very close
in proximity to historical drill holes. The recent drilling not only followed the same trends as the historical
drilling, but also produced mineral intercept data similar in depth, thickness, and grade, thereby validating
the historical results.
The QP has adequately verified the historical and recent data for the Duck Creek Project. The QP has
reviewed the data validation process and finds the drillhole database to be sufficient and adequate for
resource estimation. The QP concludes the work done by Noble Plains to verify the historical data has
validated the Project information used to calculate the resource estimate.
Qualified Person
Christopher McDowell, P .G., a registered member of the Society for Mining, Metallurgy & Exploration
(Member No. 4311521), Project Manager at WWC Engineering, is the QP as defined in Canadian National
Instrument 43-101, who has read and approved the technical content of this news release.
Risks and Factors That May Materially Affect the Mineral Resource Estimate
The mineral resource estimate disclosed in this news release is subject to a number of known risks and
uncertainties that could materially affect its potential development, including:
• Permitting and regulatory approvals. The Project does not currently hold the permits and
authorizations required to conduct in-situ recovery ("ISR") uranium operations. Advancement to
development will require, among other approvals, a source materials license (administered by the
State of Wyoming as an Agreement State of the U.S. Nuclear Regulatory Commission), a Permit to
Mine from the Wyoming Department of Environmental Quality – Land Quality Division, Class III
underground injection control permits and an aquifer exemption from the U.S. En vironmental
Protection Agency or its state -delegated authority, and water rights authorizations from the
Wyoming State Engineer's Office. There is no assurance that any or all of these approvals will be
obtained on a timely basis or at all, or on terms acceptable to the Company.
• Amenability to ISR. The Classification of mineralization at the Project as ISR -amenable is
preliminary. Confirmation of ISR amenability will require additional hydrogeological
characterization (including pump testing, water chemistry analysis, and confirmation of confined
aquifer conditions), as well as bottle -roll or column l each metallurgical testing. Adverse results
from this testing could materially reduce the portion of the resource that is ultimately
economically recoverable.
• Operations. Operational risks such as reagents, power, labor and/or material cost fluctuations
exist and could impact development and future operations.
• Surface access and land tenure. The Project is held through a combination of unpatented mining
claims and other surface and mineral interests. Maintenance of claim title requires ongoing
payment of federal maintenance fees and compliance with state and federal regulations. Surface
access for drilling and development may require negotiation of surface use agreements with
surface owners, where mineral and surface estates are split.
• Bonding and financial assurance. Future ISR operations will require posting of reclamation,
restoration, and long-term groundwater monitoring bonds with state and federal regulators. The
amount of financial assurance required is determined by the regulator and could be material.
• Uranium market and commodity price. The resource is sensitive to the uranium price, which has
historically been volatile and is influenced by factors outside the Company's control.
• Estimation risk. Mineral resource estimates are inherently uncertain and may require revision as
additional drilling, sampling, and technical information becomes available. Inferred mineral
resources, in particular, are based on limited information and may not be upgraded to the
indicated or measured categories.
About Noble Plains Uranium
Noble Plains Uranium Corp. is a U.S.-focused uranium exploration and development company advancing a
portfolio of high -potential projects amenable to In Situ Recovery (ISR) — the most capital -efficient and
environmentally responsible method of uranium extr action. Our strategy targets historically drilled and
underexplored assets in proven jurisdictions, with the objective of rapidly delineating NI 43-101 compliant
resources and building a scalable inventory of domestic uranium.
On Behalf of the Board of Directors,
“Drew Zimmerman”, CEO & President
For further information, please contact: Drew Zimmerman: (778) 686-0973
Website: www.nobleplains.com
X: https://x.com/NOBLuranium
Disclaimer
This news release includes certain forward -looking statements as well as management's objectives,
strategies, beliefs and intentions. Forward looking statements are frequently identified by such words as
"may", "will", "plan", "expect", "anticipate", "esti mate", "intend" and similar words referring to future
events and results. Forward-looking statements include, but are not limited to, statements regarding the
planned drill program, the timing of drilling and results, the potential to outline a uranium res ource
prepared in accordance with National Instrument 43 -101 standards, the potential to confirm or expand
mineralization, and the potential of the Duck Creek Project to become a significant uranium asset. Forward-
looking statements are based on the current opinions and expectations of management. All forward -
looking information is inherently uncertain and subject to a variety of assumptions, risks and uncertainties,
including but not limited to: exploration results that may not be consistent with historical data or
expectations, geological or technical issues, regulatory approvals, availability of equipment and personnel,
the speculati ve nature of mineral exploration and development, and fluctuating commodity prices , as
described in more detail in our recent securities filings available at www.sedar plus.ca. Actual events or
results may differ materially from those projected in the forward -looking statements and we caution
against placing undue reliance thereon. We assume no obligation to revise or update these forward -
looking statements except as required by applicable law.
Neither the TSX Venture Exchange nor its Regulations Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accept responsibility for the adequacy or accuracy of this release.