How Anson’s New Models Unveil a Vast Lithium Brine Reservoir at Green River

Comprehensive Geological Modeling Advances Green River Project

Anson Resources Ltd (ASX, ASN) has announced a significant technical milestone for its Green River Lithium Project in Utah, USA, with the completion of both static and dynamic Petrel geological models. These models integrate previous 3D geological and groundwater flow data to provide a detailed subsurface understanding of the lithium-rich brine reservoirs within the Mississippian Unit.

The models confirm that the Mississippian Unit, a key geological formation hosting lithium brines, ranges from 500 to over 700 feet thick across the project area. Importantly, the models reveal a large, interconnected brine reservoir extending throughout the Green River Lithium Project, connecting wells such as Mt Fuel Skyline-Geyser 1-15 and Boysdaba #1. This connectivity suggests a substantial resource base that could support scalable lithium extraction.

Strategic Well Selection and Resource Expansion Potential

Leveraging the model insights, Anson has identified the Mt Fuel well as an ideal candidate for re-entry drilling. Historical drilling logs indicate that the bottom of the Mississippian Unit was not reached in this well, presenting an opportunity to extend the resource estimate under the JORC Code. The re-entry program aims to better define the reservoir’s full extent and lithium content, potentially increasing the project's resource base.

The models also highlight the presence of at least 42 distinct aquifers within the Mississippian Unit, many containing brine. Understanding the distribution and thickness of these aquifers is critical for optimizing well placement, extraction strategies, and disposal plans. This detailed stratigraphic and structural information will feed into engineering studies to estimate operating costs and production feasibility.

Geological Faults and Future Drilling Plans

The project area features two major geological structures, the Grand Wash Fault and the Ten Mile Garben, that may act as traps concentrating lithium grades by influencing brine flow. While these faults do not extend beyond the project’s western boundary, their impact on lithium distribution remains a key hypothesis to be tested in upcoming drilling campaigns, particularly around the Mt Fuel well.

Historical wells drilled for oil and gas intersected brines but were not assayed for lithium, leaving a gap that Anson’s current program aims to fill. The company plans further drilling and sampling, including targeting the Leadville Limestone unit, to expand the resource and support feasibility studies.

Implications for Project Development and Market Positioning

By integrating geological, hydrological, and petrophysical data into the Petrel models, Anson is advancing its understanding of reservoir dynamics and production potential. This approach supports more accurate cost modeling for extraction and disposal wells, a critical step toward commercial lithium production. Given the surging demand for lithium in energy storage and electric vehicles, these developments position Anson to capitalize on a strategically important resource.

While the models provide a robust framework, the economic viability of the Green River Project hinges on forthcoming drilling results and lithium assays. The company’s ability to convert geological potential into a defined, economically extractable resource will be closely watched by investors and industry observers alike.