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enCore Energy Announces Filing of S-K 1300 Technical Report Summaries for Key Projects in Texas and Wyoming

2025-02-27

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NASDAQ:EU TSXV:EU www.encoreuranium.com

DALLAS , Feb. 27, 2025 /PRNewswire/ - enCore Energy Corp. (NASDAQ: EU) (TSXV: EU) (the "Company" or "enCore"), America's Clean Energy Company™, announces the filing of Technical Report Summaries ("TRS") prepared in accordance with U.S. Securities & Exchange Commission ("SEC") Regulation S-K 1300 of the Securities Exchange Act ("S-K 1300") for four of its key uranium projects: the Alta Mesa Uranium Project ("Alta Mesa Project"), the Mesteña Grande Uranium Project ("Mesteña Grande Project"), the South Texas Integrated Uranium Projects ("South Texas Project") and the Gas Hills Uranium Project ("Gas Hills Project"). These reports provide updated mineral resource estimates and preliminary economic assessments ("PEA") in accordance with SEC disclosure requirements.

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As of January 1, 2025 , enCore is reporting all mineral resources in accordance with Item 1302 of S-K 1300 in addition to Canadian National Instrument 43-101 ("NI 43-101"). S-K 1300 was adopted by the SEC to modernize mineral property disclosure requirements for mining registrants and to align United States ("U.S.") disclosure requirements for mineral properties more closely with current industry and global regulatory standards. The transition to also reporting under S-K 1300 aligns enCore's disclosures with U.S. regulatory standards, ensuring consistency and transparency for investors.

About the Alta Mesa Project and Mesteña Grande Project The Alta Mesa Project, and the Mesteña Grande Project are located in South Texas, USA . The TRS filings prepared under S-K 1300 disclose a mineral resource and preliminary economic assessment* for the Company's uranium projects located in South Texas . The reports provide the following:

The Alta Mesa Project's estimated capital costs are $25.9 M and includes $2.5 M to complete refurbishment of the Alta Mesa Central Processing Plant ("CPP") and $23.4 M for wellfield development. The Mesteña Grande Project's estimated capital costs are $108.1 M and includes $13.7 M for processing facilities and $94.4 M for wellfield development. Both the Alta Mesa Project and the Mesteña Grande Project are located entirely within private land holdings of the Jones Ranch in South Texas . The Jones Ranch is an approximately 380,000-acre ranch that was founded in 1897, and enCore controls over 200,000 of the 380,000 acres with mineral leases and options for uranium exploration and development. The Alta Mesa Project is an established In-Situ Recovery ("ISR") uranium project with a CPP and wellfields undergoing extraction operations in PAA7. The Alta Mesa CPP and mine office are located at the Alta Mesa property approximately 22 miles south of the town of Falfurrias. The Alta Mesa CPP and wellfield operations are located on a 4,598-acre mining lease adjacent to the 198,000+ acres Mesteña Grande exploration option. The Alta Mesa wellfields and CPP are located entirely in Brooks County, Texas . The Mesteña Grande Project is an exploration-stage ISR uranium project comprised of multiple prospective areas within the region and primarily located northwest of the Alta Mesa operations within the 198,000+ acre exploration option. enCore plans to develop and advance the Mesteña Grande Project and process uranium at the Alta Mesa CPP. The Mesteña Grande exploration projects are in both Brooks and Jim Hogg Counties, Texas . Uranium mineralization at both the Alta Mesa and Mesteña Grande projects occur as roll-front deposits hosted in permeable sandstones of the Miocene Catahoula, the Miocene Oakville, and the Pliocene Goliad Formations. Significant additional potential exists both regionally and within the wellfield boundary within the Goliad Formation at depths between 400 and 600 feet, within the Oakville Formation at depths between 800 and 1300 feet, and within the Catahoula Formation to the west at depths between 450 and 600 feet. Only 5% of the Mesteña Grande Project areas have been explored, with previous exploration efforts having identified 52 linear miles of stacked reduction/oxidation ("REDOX") fronts, with only 5 miles of the REDOX fronts closely drilled out to date.

| _*The above preliminary economic assessments are preliminary in nature, and include inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves, and there is no certainty that the preliminary economic assessments will be realized. _ |

Alta Mesa Project Mineral Resource Summary

Alta Mesa Project Inferred Mineral Resource Summary

| Category | Tons (x 1,000) | Avg Grade (%) U 3 O 8 | Total Lbs. (x 1000) U 3 O 8 | | Measured | 263.7 | 0.136 | 691.4 | | Indicated | 630.0 | 0.150 | 1,894.5 | | Total Measured and Indicated | 894.0 | 0.145 | 2,585.9 | | Inferred | 2,223.4 | 0.112 | 5,200.5 | | Total Inferred | 2,223.4 | 0.112 | 5,200.5 |

| Notes: | | | 1. | enCore reports mineral reserves and mineral resources separately. Reported mineral resources do not include mineral reserves. | | 2. | The geological model used is based on geological interpretations on section and plan derived from surface drillhole information. | | 3. | Mineral resources have been estimated using a minimum grade-thickness cut-off of 0.30 ft% U 3 O 8 . | | 4. | Mineral resources are estimated based on the use of ISR for mineral extraction. | | 5. | Inferred mineral resources are estimated with a level of sampling sufficient to determine geological continuity but less confidence in grade and geological interpretation such that inferred resources cannot be converted to mineral reserves. | | 6. | Mineral resources that are not mineral reserves do not have demonstrated economic viability. |

Mesteña Grande Project Mineral Resource Summary

Mesteña Grande Project Inferred Mineral Resource Summary

| Category | Tons (x 1,000) | Avg Grade (%) U 3 O 8 | Total Lbs. (x 1000) U 3 O 8 | | Measured | 0.0 | 0.000 | 0.0 | | Indicated | 0.0 | 0.000 | 0.0 | | Total Measured and Indicated | 0.0 | 0.000 | 0.0 | | Inferred | 5,852.8 | 0.119 | 13,887.9 | | Total Inferred | 5,852.8 | 0.119 | 13,887.9 |

Alta Mesa and Mesteña Grande Technical Report Summaries The TRS entitled "Alta Mesa Uranium Project, Brooks County, Texas , USA" dated February 19, 2025 , with an effective date of December 31, 2024 , was prepared and signed by SOLA Project Services, LLC, 4912 Stoneridge Way, Casper, Wyoming 82601, with Stuart Bryan Soliz , being the Qualified Person for the purposes of NI 43-101 and S-K 1300.

The TRS entitled "Mesteña Grande Uranium Project, Brooks and Jim Hogg Counties, Texas, USA " dated February 19, 2025 , with an effective date of December 31, 2024 , was prepared and signed by SOLA Project Services, LLC., 4912 Stoneridge Way, Casper, Wyoming 82601, with Stuart Bryan Soliz , being the Qualified Person for the purposes of NI 43-101 and S-K 1300.

The TRS filing for each of the Alta Mesa Project and the Mesteña Grande Project was prepared pursuant to S-K 1300 and filed with the SEC as an exhibit to a Current Report on Form 8-K. In addition, a separate TRS for each project was prepared in accordance with the form requirements under Canadian NI 43-101 and was filed with Canadian securities regulators on SEDAR+.

About the South Texas Integrated Properties Project This filing discloses a mineral resource and PEA for the Company's key pipeline ISR uranium projects located in South Texas . The report provides the following:

Combined Measured and Indicated Resources for the South Texas Project are 3,527,000 lbs. U 3 O 8 , with Inferred Resources of 308,000 lbs. U 3 O 8 . The PEA indicates a pre-tax net present value ("NPV") of $104.3 million at an 8% discount rate. When income taxes are included in the calculation, the after tax NPV is $81.8 million at an 8% discount rate. The mine plan and economic analysis are based on the following assumptions: A recovery factor of 80% on the measured and indicated mineral resource (inferred mineral resource was excluded). A variable U 3 O 8 sales price ranging from $78.37 /lb. up to $92.04 /lb. with an overall average U 3 O 8 sales price of $87.05 /lb. A mine life of nine years (six years production followed by three years of restoration/surface reclamation); and A pre-income tax cost including royalties, state and local taxes, operating costs, and capital costs of $43.12 /lb.

The South Texas Project consists of five project areas: The Rosita CPP, including the Cadena ISR Project (" Rosita South - Cadena ISR Project" or "Cadena"), Butler Ranch Uranium ISR Project ("Butler Ranch"), Upper Spring Creek - Brevard Area ISR Uranium Project (" USC – Brevard" or "Brevard"), Upper Spring Creek - Brown Area ISR Uranium Project (" USC – Brown" or "Brown"). The South Texas Project's properties are located in Karnes , Bee , Live Oak and Duval Counties, Texas, USA . The Rosita CPP will serve as the central location and uranium processing facility for the South Texas Project, with the other project areas serving as wellfields with remote ion exchange facilities. The Rosita CPP will process all uranium bearing resin from each of the other South Texas Project areas. The South Texas Project extracts uranium using ISR technology (see below). enCore currently controls over 5,724 acres in total within region. Mineral rights for the South Texas Project are all private (fee) mineral leases and/or owned by URI, Inc. ("URI"), a wholly owned subsidiary of enCore. Fee mineral leases are obtained through negotiation with individual mineral owners. The uranium mineral resource estimates for the South Texas Project are based on data from 4,523 drill holes that included survey coordinates, collar elevations, depths and grade/grade thickness of uranium intercepts.

South Texas Properties Mineral Resource Summary

| _*The in-place resources were estimated separately for each project area. Tables list the Project resources by the project area. The effective date of the resource estimate is December 31, 2024. _ |

South Texas Uranium Project Measured and Indicated Resource Summary*

| Project Area | GT Cutoff | Average GT | Uranium (lbs. U 3 O 8 ) | | Upper Spring Creek – Brevard Area | | | | | Measured | 0.3 | 0.59 | 800,000 | | Indicated | 0.3 | 0.40 | 38,000 | | Total Measured and Indicated | - | - | 838,000 | | Upper Spring Creek – Brown Area | | | | | Measured | 0.3 | 1.17 | 1,339,000 | | Indicated | 0.2 | 2.15 | 720,000 | | Total Measured and Indicated | - | - | 2,059,000 | | Rosita South - Cadena | | | | | Measured | 0.3 | 0.80 | 615,000 | | Indicated | 0.3 | 0.42 | 15,000 | | Total Measured and Indicated | - | - | 630,000 | | Project Totals | | | | | Measured | | 2,754,000 | | | Indicated | | 773,000 | | | Total Measured and Indicated | | 3,527,000 | |

| Notes: | | | 1. | Mineral resources as defined in 17 CFR § 229.1300 and as used in NI 43-101. | | 2. | All resources occur below the static water table. | | 3. | The point of reference for mineral resources is in-situ at the Project. | | 4. | Mineral resources that are not mineral reserves do not have demonstrated economic viability. | | 5. | An 80% metallurgical recovery factor was considered for the purposes of the economic analysis. | | 6. | There are no measured or indicated resources at Rosita CPP or Butler Ranch. |

South Texas Uranium Project Inferred Resource Summary *

| Notes: | | | 1. | Mineral resources as defined in 17 CFR § 229.1300 and as used in NI 43-101. | | 2. | All resources occur below the static water table. | | 3. | The point of reference for mineral resources is in-situ at the Project. | | 4. | Mineral resources that are not mineral reserves do not have demonstrated economic viability. | | 5. | There are no inferred resources at Rosita CPP, Butler Ranch, Brevard or Cadena. |

South Texas Properties Technical Report Summary The TRS, entitled "Technical Report on the South Texas Integrated Uranium Projects Texas, USA" with an effective date of December 31, 2024 (referred to herein as the "South Texas TRS"), was prepared under S-K 1300 and filed with the SEC as a Current Report on Form 8-K. In addition, the South Texas TRS was prepared in accordance with the form requirements under NI 43-101 and was filed with Canadian securities regulators on SEDAR+. The South Texas TRS was prepared by WWC Engineering, 1849 Terra Avenue, Sheridan, WY 82801, with Christopher McDowell , P.G. and Ray Moores, P.E., being the Qualified Persons for the purposes of NI 43-101 and S-K 1300.

About the Gas Hills Project

The Gas Hills Project is located in Fremont and Natrona Counties, in Wyoming, USA . The Gas Hills TRS discloses a mineral resource and PEA for the Company's key pipeline ISR uranium project. The report provides the following:

Measured and Indicated ISR Resources for the Gas Hills Project are 7,705,000 lbs. U 3 O 8 for the current project areas, with Inferred ISR Resource for the Gas Hills Project of 428,000 lbs. U 3 O 8 .

The PEA indicates a pre-tax NPV of $166.9 million at an 8% discount rate with an internal rate of return ("IRR") of 54.8% compared to an after-tax NPV of $141.8 million at an 8% discount rate with an IRR of 50.2%. The mine plan and economic analysis are based on the following assumptions: A recovery factor of 80% of the measured and indicated mineral resource (no inferred mineral resource is included); A U 3 O 8 sales price of $87.00 /lb.; A mine life of 11 years; A pre-income tax cost including royalties, state and local taxes, operating costs, and capital costs of $40.61 /lb.; and Initial capital costs $55.2 million .

The Company's 100% owned Gas Hills Project is one of enCore's development priorities following the focus on production in South Texas , and Dewey-Burdock (refer to the separate TRS news release for Dewey-Burdock here: https://encoreuranium.com/news/encore-energy-files-dewey-burdock-s-k-1300-technical-resource-summary /). The Gas Hills Project consists of approximately 1,280 surface acres and 12,960 net mineral acres of unpatented lode mining claims, a state of Wyoming mineral lease, and private mineral leases, within a brownfield site which has experienced extensive development including mine and mill site cumulative production in excess of 100 million pounds of uranium, mainly from open-pit mining, but also from underground mining and ISR.

Gas Hills Project Mineral Resource Summary

Note - The mineral resource estimation method utilized in this report is the Grade Thickness (GT) contour method. This method is considered appropriate for this type of deposit.

Gas Hills Project Measured and Indicated Mineral Resource Summary

| December 31, 2024, Combined (GT cutoff 0.10) | | | | | | | | Pounds | Tons | Avg. Grade | Avg. Thickness | Avg. GT | | Measured | 2,051,000 | 994,000 | 0.10 % | 5.35 | 0.552 | | Indicated | 8,713,000 | 6,031,000 | 0.07 % | 6.13 | 0.443 | | Total M&I | 10,764,000 | 7,025,000 | 0.08 % | 6.05 | 0.463 | | December 31, 2024, ISR Only (GT cutoff 0.10) | | | | | | | | Pounds | Tons | Avg. Grade | Avg. Thickness | Avg. GT | | Measured | 2,051,000 | 994,000 | 0.10 % | 5.35 | 0.552 | | Indicated | 5,654,000 | 2,835,000 | 0.10 % | 4.92 | 0.491 | | Total M&I | 7,705,000 | 3,829,000 | 0.10 % | 4.99 | 0.502 | | December 31, 2024, Non-ISR Only (GT cutoff 0.10) | | | | | | | | Pounds | Tons | Avg. Grade | Avg. Thickness | Avg. GT | | Indicated | 3,059,000 | 3,196,000 | 0.05 % | 8.6 | 0.412 | | Total M&I | 3,059,000 | 3,196,000 | 0.05 % | 8.6 | 0.412 |

| Notes: | | | 1. | Mineral resources as defined in 17 CFR § 229.1300 and as used in NI 43-101. | | 2. | All ISR Only resources occur below the static water table. | | 3. | The point of reference for mineral resources is in-situ at the Project. | | 4. | Mineral resources that are not mineral reserves do not have demonstrated economic viability. | | 5. | An 80% metallurgical recovery factor was considered for the purposes of the economic analysis. | | 6. | Totals may not sum due to rounding. |

Gas Hills Project Inferred Mineral Resource Summary

| December 31, 2024, Combined (GT cutoff 0.10) | | | | | | | | Pounds | Tons | Avg. Grade | Avg. Thickness | Avg. GT | | Inferred | 490,000 | 514,000 | 0.05 % | 6.16 | 0.293 | | December 31, 2024, ISR Only (GT cutoff 0.10) | | | | | | | | Pounds | Tons | Avg. Grade | Avg. Thickness | Avg. GT | | Inferred | 428,000 | 409,000 | 0.05 % | 5.94 | 0.31 | | December 31, 2024, Non-ISR Only (GT cutoff 0.10) | | | | | | | | Pounds | Tons | Avg. Grade | Avg. Thickness | Avg. GT | | Inferred | 62,000 | 105,000 | 0.03 % | 7.01 | 0.208 |

Gas Hills Technical Report Summary The TRS, entitled "Technical Report on the Gas Hills Uranium Project, Fremont and Natrona Counties Wyoming, USA" with an effective date of December 31, 2024 (referred to herein as the "Gas Hills TRS"), was prepared under S-K 1300 and filed with the SEC on Form 8-K. In addition, the Gas Hills TRS was prepared in accordance with the form requirements under NI 43-101 and was filed with Canadian securities regulators on SEDAR. The Gas Hills TRS was prepared by WWC Engineering, 1849 Terra Avenue, Sheridan, WY 82801, with Christopher McDowell , P.G. and Ray Moores, P.E., being the Qualified Persons for the purposes of NI 43-101 and S-K 1300.

Technical Disclosure and Qualified Person All technical information in this news release was approved by John M. Seeley , Ph.D., P.G., C.P.G., enCore's Manager of Geology and Exploration, and a Qualified Person of the Company and a Qualified Person as defined in NI 43-101 and S-K 1300.

About In-Situ Recovery Technology In-Situ Recovery offers a minimally intrusive, eco-friendly, and economically competitive approach to mineral extraction. It's been proven to be a successful technique for obtaining uranium that replaces conventional open pit or underground workings with wellfield technology. ISR does not involve open pits, waste dumps, or tailings, making it more environmentally considerate. This method also streamlines the permitting, development, and remediation processes. With ISR, uranium is extracted without disturbing the surface, and once the process is complete, the land is restored to its original state and purpose.

About enCore Energy Corp. enCore Energy Corp., America's Clean Energy Company™, is committed to providing clean, reliable, and affordable fuel for nuclear energy as the only United States uranium producer with multiple extraction facilities in operation. The enCore team is led by industry experts with extensive knowledge and experience in all aspects of In-Situ Recovery uranium operations and the nuclear fuel cycle. enCore solely utilizes ISR for uranium extraction, a well-known and proven technology co-developed by the leaders at enCore Energy.