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South Texas ISR Uranium Operations
Rosita CPP, Alta Mesa CPP. Kingsville Dome CPP and South Texas Projects
South Texas Operation Highlights
enCore owns and controls three of the four licensed ISR uranium plants in Texas, a business-friendly and energy-centric jurisdiction. There are 11 licensed ISR plants in the United States, although not all are operational.
Rosita and Alta Mesa Central Processing Plants are currently operating.
All operations utilize In-Situ Recovery (“ISR”) technology and are capable of multiple regional satellite feeds.
Operation expansion potential with minimal investment.
Texas is the most progressive permitting and production jurisdiction in the United States.
About enCore’s South Texas Operations
Currently, enCore Energy is the only United States uranium processing company with multiple operating extraction plants. enCore is focused on processing domestic uranium utilizing the proven In-Situ Recovery technology (“ISR”) to provide necessary fuel for the generation of clean, reliable, and carbon-free nuclear energy.
Rosita CPP & Wellfields
Alta Mesa CPP & Wellfields
Kingsville Dome CPP
Rosita CPP & Wellfields
Rosita ISR Uranium Central Processing Plant and Wellfields
Location
The Rosita Central Processing Plant (“CPP”) is located approximately 60 miles west of Corpus Christi, Texas in the Texas Uranium Belt.
Operation
A fully licensed CPP with an operational capacity of 800,000 pounds of U3O8 per year; expandable under existing license.
Status
Currently operating since November 2023. The Rosita CPP serves as the Central Processing Plant to one permitted ISR wellfield with plans to receive material from future Satellite IX Projects.
The Rosita CPP is licensed to receive uranium-loaded resin from remote project areas across the South Texas region through a network of Satellite IX Plants. These Satellite IX Plants, located near wellfields, are a key component of the ISR uranium extraction process. A lixiviant, consisting of groundwater mixed with oxygen and sodium bicarbonate (baking soda), is injected into the wellfield using ISR technology, where it dissolves uranium from the underground sandstone. The uranium-bearing solution is then pumped to the surface and directed through the IX columns at the nearby Satellite IX Plant, where uranium is absorbed onto resin beads. The uranium-loaded resin is then transported to the Rosita CPP, where the uranium is removed from the resin and processed into yellowcake. Once processed, the resin is recycled and trucked back to the Satellite IX Plants for reuse. These modular, efficient, and relocatable IX Plants allow for cost-effective operation across multiple sites without the need to construct full processing facilities at each location, and they can be relocated once a wellfield is depleted.
The Rosita CPP is currently processing uranium coated resin from the Rosita Wellfield. The Rosita CPP is slated to ultimately process uranium coated resin from a number of other satellite facilities including:
- The Upper Spring Creek – Brown Area ISR Uranium Project
- The Upper Spring Creek – Brevard Area ISR Uranium Project
- The Rosita South Cadena ISR Project
- The Butler Ranch Uranium ISR Project
Currently, the Rosita ISR CPP includes the following wellfields and proposed satellite project areas:
Rosita Production Area 5 (Wellfield 5)- Wellfield 5 is located less than 1 mile southwest of the Rosita CPP. This Satellite IX facility was completed in Q4 of 2022 and Wellfield 5 was the first production area for enCore’s refurbished Rosita CPP. Uranium extraction began from this wellfield in November of 2023 and continues. This permitted wellfield includes uranium mineralization extending approximately 3,000 feet in length.
Upper Spring Creek – Brown Area Project, Live Oak County, Texas – The USC-Brown Project is currently under construction and is scheduled for development from Oakville Formation mineralization by 2026, having received inclusion in the Radioactive Materials License (RML)
Upper Spring Creek – Brevard Area Project, Live Oak and Bee Counties, Texas – The USC Brevard wellfield is scheduled for development from basal Oakville Formation sands in late 2026, dependent upon permitting.
Rosita South, Duval County, Texas – The Rosita South Project is located approximately 3.5 miles southwest of the Rosita CPP and provides one of the most optimal sources of satellite feed for the Rosita CPP. The Rosita South Project will extract uranium from the Goliad Formation. A deeper Oakville Formation exploration program is also currently underway at the project site. To date, enCore has completed 32 drill holes for a total of approximately 11,000 feet including twenty delineation drill holes, and 12 deep exploration drill holes. The deep exploration drilling has identified eight mineralized sands plus an additional four potentially mineralized sands, all within 800 feet of the surface, which provide opportunities for discovery of future uranium resources.
Butler Ranch Project, Karnes County, Texas –The Butler Ranch Project is situated in the southwestern end of the Karnes County uranium mining district, one of the largest uranium production areas in Texas. 2024 Rosita Uranium Project Measured and Indicated Resource Summary
Uranium mineralization at the Rosita Wellfield occurs as roll-fronts hosted in porous and permeable sandstones of the Goliad Formation, at depths ranging from 125 to 350 feet below the surface. Additional potential for economic roll-front mineralization may exist between 500 and 700 feet in the Oakville Formation and is the subject of current exploration efforts.
Alta Mesa CPP & Wellfields
Alta Mesa ISR Uranium Central Processing Plant and Wellfields
Location
Located 80 miles south of the Rosita CPP and 75 miles southwest of Corpus Christi, on ~200,000 acres of private land in South Texas uranium belt.
Operating Capacity
Total operating capacity is 1.5 million lbs. per year with an additional drying capacity of 0.5 million lbs.
Status
Currently in operation as of June 2024.
The Alta Mesa ISR Uranium Project operates under a 70/30 joint venture between enCore and Boss Energy Ltd. that is managed by the Company. The Project hosts a fully licensed and constructed CPP with operational wellfields and associated exploration projects.
Alta Mesa is now nearing flow capacity with two of the CPP’s three ion exchange circuits (“IX circuits”) now in operation. Ion exchange is a filtration system which removes dissolved uranium from groundwater before it is dried and processed into U3O8 at the CPP. The three IX circuits, when fully operational, can simultaneously provide dissolved uranium to the Alta Mesa CPP from multiple wellfields. Each circuit has a 2,500 gallons per minute (“gpm”) capacity. The first IX circuit was commissioned in June 2024, while the second IX circuit commenced operations in Q1 of 2025. The third IX circuit will come online when flow and extraction rates require it.
enCore’s operations at Alta Mesa involve a phased ramp-up of installed injection and recovery wells to capture increasing amounts of uranium from not only the currently producing Wellfield 7 but beyond, as additional well installations are planned for Wellfield 3-Extension and Wellfield 6. Continuing installation of additional injection and recovery wells will occur in Wellfield 7 through much of 2026 with Wellfield 3-Extension and Wellfield 6 slated to come online in late 2025 to early 2026 with additional well installation continuing through 2026.
Mesteña Grande Uranium Exploration Project, Brooks and Jim Hogg Counties, Texas– The Mesteña Grande Project properties include multiple project areas including 52 linear miles of stacked reduction-oxidation fronts identified; only approximately 5 miles of the identified fronts have been explored to date. Significant additional potential exists regionally within the permitted boundary in various locations within the Goliad Formation sands at depths between 400 and 500 feet, within the Oakville Formation sands at depths between 1050 and 1300 feet, and within the Catahoula Formation at depths between 450 and 600 feet. Exploration is planned across multiple areas of the Mesteña Grande Project.
History & Overview
The Alta Mesa CPP historically extracted nearly 5 million lbs. of uranium between 2005 and 2013 when production was curtailed due to low uranium prices. The Alta Mesa Project continues to utilize ISR technology to extract uranium in a non-invasive process using natural groundwater and oxygen.
Uranium mineralization at the Alta Mesa Project occurs locally as roll-front deposits hosted in porous and permeable sands of the Goliad Formation, at depths ranging from 300 to 600 feet beneath the surface. Significant additional potential exists locally within and surrounding the mining lease within the Goliad Formation at depths between 400 and 500 feet. Potential mineralization may yet be discovered in favorable sands within other formations at deeper levels.
Kingsville Dome CPP
Kingsville Dome ISR Uranium Central Processing Plant and Wellfield
Location
40 miles southwest of the city of Corpus Christi in Kleberg County, Texas.
Operation
Production capacity of 800,000 pounds of U3O8 per year.
Status
Uranium production at Kingsville Dome was suspended in 2009 and the CPP has been in a standby status since that time.
The Kingsville Dome ISR Uranium Central Processing Plant (CPP) and Wellfield is comprised of multiple tracts of land leased from third parties. The Kingsville Dome CPP is situated on approximately 15 acres of Company-owned land, surrounded by leased acreage located approximately eight miles southeast of the city of Kingsville. The CPP & Wellfield was constructed in 1987 as an up-flow uranium ion exchange circuit, with complete drying and packaging facilities within the recovery plant. The CPP & Wellfield produced uranium between 1988 and 1990, from 1996 to 1999, and most recently from 2007 through 2009. Two independent resin processing circuits and elution systems comprise the plant’s processing equipment, along with a single drying circuit.
The CPP has two 500 gallon per minute reverse osmosis systems for groundwater restoration. The first unit was idled in 2010 and the second unit was idled in January of 2014, when groundwater restoration was completed. The CPP can serve as a processing facility that can accept resin from multiple satellite facilities. In addition to the CPP, there are four satellite ion exchange systems in the wellfield area. Each of the satellite systems is capable of processing approximately 900 gallons per minute of uranium-bearing ISR fluids from well fields, and these satellite plants can be relocated to alternate extraction sites as needed.
Satellite Operations for the Kingsville Dome CPP and Wellfield
Vasquez Wellfield, Texas – The Vasquez Wellfield is located in southern Duval County, Texas, a short distance northwest of the town of Hebbronville. The project operated from 2004 through 2008 as a satellite plant operation to the Kingsville Dome CPP until the mineral resource was depleted and reclamation commenced. The Wellfield is situated on a leased tract of land that is being held until final restoration has been completed. The Vasquez property consists of a mineral lease of 1,023 gross and net acres. While the primary term of the mineral lease expired in February 2008, the Company continues to hold the lease by carrying out restoration activities.
