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GTI Energy

Drilling to Start Mid November at Lo Herma ISR Uranium Project

GTI Energy Ltd (ASX: GTR) (GTI or Company) is pleased to advise that permitting is completed, and bonds are now in place to begin drilling at its 100% owned Lo Herma ISR Uranium Project (Lo Herma) located in Wyoming’s prolific Powder River Basin (Figures 1 & 2). This initial program of up to 26-holes (~15,000 ft or ~4,600 m), will utilise mud rotary drilling and down hole gamma logging.

  • Permits and bonds in place for drilling to start mid-November at the Lo Herma ISR Uranium Project in Wyoming’s Powder River Basin.
  • Lo Herma is ~10miles from the US’s largest ISR U3O8 production plant at Cameco’s Smith Ranch-Hyland & ~60 miles from UEC’s Irigaray & Energy Fuels’ Nichols Ranch
  • Initial drilling of up to 26 holes (~15,000ft/~4,600m) to validate and upgrade the maiden JORC inferred resource of 5.7Mlbs U3O8 at average grade 630ppm
  • Drilling to also target exploration potential along trend in the Wasatch Formation & in the deeper Fort Union Formation which Cameco produces from ~10 miles west.
  • New strategic claim staking in progress to grow the Lo Herma project area
  • Promising results received from recent aerial geophysical survey at Lo Herma
  • Green Mountain aerial geophysics results to be delivered in the coming weeks

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GTI has also secured an additional strategic area of 28 lode claims, contiguous with the existing land position at Lo Herma (Figure 2). The new claims contain historical drill holes & hold excellent exploration potential particularly within the under-explored deeper Fort Union formation sands.

Final results from the recent aerial radiometric & magnetic surveys have been received, providing valuable geophysical data for Lo Herma, Green Mountain, & Loki West. At Lo Herma, the radiometric map (Figure 4) confirmed our exploration hypothesis & assists with the characterization of mineralized REDOX trends, previously projected across the property. The suite of aerial geophysical survey products will be invaluable in planning future exploration.

GTI Executive Director & CEO Bruce Lane commented“we are delighted to be heading back into the field for our maiden drill program at Lo Herma. This campaign is designed to verify the large body of historical data used to prepare the Lo Herma JORC inferred resource whilst upgrading & potentially extending that resource. Our near term objective is to build sufficient data from this drilling & a follow-up campaign in 2024, to support a preliminary economic assessment for the project."


The Lo Herma ISR Uranium Project (Lo Herma) is located in Converse County, Powder River Basin (PRB), Wyoming (WY). The Project lies approximately 15 miles north of the town of Glenrock and close to seven (7) permitted ISR uranium production facilities. These facilities include UEC’s Willow Creek (Irigaray & Christensen Ranch) & Reno Creek ISR plants, Cameco’s Smith Ranch-Highland ISR facilities and Energy Fuels Nichols Ranch ISR plant (Figure 1). The Powder River Basin has extensive ISR uranium production history with numerous defined ISR uranium resources, central processing plants (CPP) & satellite deposits (Figure 1). The Powder River Basin has been the backbone of Wyoming U3O8 production since the 1970s.

FIGURE 1. WYOMING IS URANIUM PROCESSING PLANTS & GTI PROJECT LOCATIONS11 Data sources are detailed on Page 7. ISR uranium deposits and plant locations are approximated. Dewey Burdock is on the South Dakota Border

As reported to ASX on 14 March 2023, a comprehensive historical data package, with an estimated replacement value of ~$15m, was purchased for the Lo Herma project in March of 2023. The data package includes original drill data for roughly 1,771 drill holes, from the 1970’s and 1980’s, pertaining to the Lo Herma region. 1,391 original drill hole logs were digitised for gamma count per second (CPS) data and converted to eU3O8% grades. 845 of the drill holes were located on GTI’s current land position & used to prepare the Mineral Resource Estimate.

An initial exploration target for the Lo Herma project was previously announced to the ASX on 4 April 2023. An additional data package containing previously unavailable drill maps with geologically interpreted redox trends was subsequently secured by GTI as announced to the ASX on 27 June 2023. The additional redox trend interpretations allowed for an update of the previously reported Lo Herma exploration target (Table 1).


The potential quantity and grade of the Exploration Targets is conceptual in nature and there has been insufficient exploration to estimate a JORC-compliant Mineral Resource Estimate. It is uncertain if further exploration will result in the estimation of a Mineral Resource in the defined exploration target areas.


Final regulatory approvals have been received to begin drilling at Lo Herma. The initial drilling program is a 26-hole (~15,000ft/~4,600m) campaign to both confirm a subset of historical drill holes as well as explore untested locations and depths. Drilling is expected to average 500 feet with a maximum potential depth of 1,500 feet. Commencement of drilling operations is anticipated to kick off mid-November pending contractor schedules and weather conditions.

Several of the drill holes are sited to target locations for confirmation of the historical drilling data. If conditions allow, the drillers will attempt to recover rock core samples of the mineralized zone for metallurgical testing. In addition to the confirmatory drilling, drill holes have been planned to test the alteration conditions of the host sand units across the property and geologic strata. This will help in further refining the locations of the projected REDOX trends and in improving targets for future exploration. These stratigraphic holes will also bring the benefit of testing the deeper sand units of the Fort Union formation which were historically underexplored.

This initial program is part of a larger permitted campaign totalling 68 holes with the balance of the campaign to be refined & assessed for execution during 2024 subject to results.


GTI has secured an area of 28 additional Lode Claims (approximately 566 acres) at Lo Herma. The ground is contiguous with the main claim block at Lo Herma. The potential of this area came to GTI’s attention through further review of the historical drill data package, indicating that this ground is highly prospective for mineralization in deeper sands within the Fort Union formation.

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