Kingman Engages Burgex to Conduct Underground Sampling and Technical Reassessment at Rosebud Mine

Rhea-AI Summary

Kingman Minerals (OTCQB: KGSSF) engaged Burgex Mining Consultants to conduct staged underground sampling and technical reassessment at the historic Rosebud Mine, Mohave Project, Arizona. Mobilization is planned on or about March 11, 2026 subject to safety planning and authorizations.

The program will document underground geometry, capture LiDAR data, and collect material for laboratory mineral processing and metallurgical testwork to refine geological interpretation and guide next exploration steps.

Vancouver, British Columbia--(Newsfile Corp. - March 5, 2026) - Kingman Minerals Ltd. (TSXV: KGS) (OTCQB: KGSSF) (FSE: 47A1) ("Kingman" or the "Company") is pleased to announce that it has engaged Burgex Mining Consultants to conduct underground sampling to obtain material for mineral processing and metallurgical testwork as part of a staged technical reassessment program at the historic Rosebud Mine, part of the Company's wholly owned Mohave Project in Arizona.

The program is designed to (i) document the underground geometry and vein exposures that remain accessible within the historic workings, and (ii) collect underground material for laboratory mineral processing and metallurgical testing under established protocols. The Company intends to use the resulting underground record and test results to refine current geological interpretation and guide next-step exploration decisions.

Figure 1 - Burgex personnel conducting a surface inspection and safety assessment of the historic Rosebud Mine production shaft area during a recent site visit.

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Rationale

Rosebud was discovered more than 140 years ago and mined intermittently for gold and silver, most prominently during the late 1920s and early 1930s. The historic workings preserve a direct record of how mining progressed through the vein system-where development advanced, where stoping occurred, where material was left in place, and where work ultimately ceased.

Simon Studer, Interim CEO, President and Director, commented: "Recovering material from multiple underground exposures and submitting it to mineral processing and metallurgical testwork is one of the most direct ways to clarify what the historic workings reveal—where mining advanced, where it stopped, and what may have constrained development at the time. He continued: "The objective is to reduce uncertainty around continuity, variability, and metallurgical response—including potential oxide versus sulfide differences."

Scope of Work and Timeline Considerations

The underground sampling and technical evaluation program are designed as a staged campaign integrating geological documentation, survey-grade measurement, and material characterization from accessible areas of the historic workings.

Key elements include:

- Underground access and evaluation: work will begin at accessible portions of the 100-foot level, with further access to additional levels evaluated as underground conditions allow.
- LiDAR survey: three-dimensional capture of shafts, drifts, and stopes to establish survey control and preserve a permanent underground record.
- Metallurgical testing: material collected underground will be submitted for laboratory mineral processing and metallurgical testing.

Program sequencing and access will be guided by underground safety considerations and site conditions encountered during the work. Burgex's crew mobilization is expected to occur on or about March 11, 2026, subject to final safety planning and authorizations.

Prior Underground Reconnaissance Phases

In early 2020, Burgex accessed the 100-foot level and collected 17 rock samples. No access was obtained below that level at the time due to obstructions within the shaft. Reported assays included values up to 252 g/t gold and 341 g/t silver over 0.46 metres (see May 14, 2020 NR). These samples were analyzed by ALS Laboratories in Reno.

A subsequent 2020 program cleared debris below the 100-foot level and accessed the 200-foot level. Channel sampling during that phase returned assays up to 688 g/t gold and 468 g/t silver. over 0.18 metres (see May 19, 2020 NR).

Figure 2 - Longitudinal section of the historic Rosebud Mine workings showing interpreted vein blocks, historic underground development, and locations of previous sampling. Values in red were collected by Burgex during the 2020 underground sampling programs. All values are presented in Au (g/t)/Ag (g/t). 

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These programs identified high-grade results within accessible workings and informed the design and sequencing of the current staged underground reassessment.

Technical Disclaimer

Historical underground sampling referenced herein, including grab and channel samples, is selective in nature and may not be representative of overall mineralization. Reported assay results should not be relied upon as indicative of grade continuity, tonnage potential, or economic viability.

Qualified Person

The technical information contained in this news release has been reviewed and approved by Brad Peek, M.Sc., CPG, a Qualified Person as defined under National Instrument 43-101 – Standards of Disclosure for Mineral Projects. Mr. Peek is a Director of Kingman Minerals Ltd.

ABOUT

Kingman Minerals Ltd. (TSXV: KGS) is a publicly traded exploration and development company focused on precious metals in North America. The Company's flagship project comprises the fully owned historic Rosebud Mine, located in the Music Mountains, Mohave County, Arizona. High-grade gold and silver veins were discovered in the area in the 1880s and were mined mainly in the late 1920s and 1930s. Underground development on the Rosebud property included a 400-foot main shaft and approximately 2,500 feet of drifts, raises and crosscuts.

For further information, please contact:

Simon D. Studer
Interim CEO, President & Director
simondavidstuder@gmail.com
Phone: +41 77 459 16 20

Corporate Office
Tel: +1 (604) 685-7720
Email: info@kingmanminerals.com
Web: www.kingmanminerals.com

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Cautionary Statement Regarding Forward-Looking Information This news release contains forward-looking information within the meaning of applicable securities laws. Forward-looking information includes, but is not limited to, statements regarding the planned scope, timing, mobilization, underground access, extraction, sampling, laboratory and metallurgical testing, and expected outcomes of the underground program. Forward-looking information is based on management's current expectations and reasonable assumptions, but involves known and unknown risks, uncertainties and other factors that may cause actual results to differ materially, including permitting and regulatory requirements, underground conditions, safety and access constraints, contractor availability and performance, laboratory capacity and turnaround times, and general market and economic conditions. Readers are cautioned not to place undue reliance on forward-looking information. The Company undertakes no obligation to update forward-looking information except as required by law.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/286302

FAQ

What will Burgex do during the March 2026 underground sampling at Rosebud (KGSSF)?

Burgex will perform staged underground access, mapping, LiDAR capture, and sample collection for metallurgical testing. According to Kingman, work targets the 100-foot level first with additional levels evaluated as conditions allow and mobilization expected about March 11, 2026.

How will the Rosebud sampling program affect KGSSF's geological interpretation?

The program aims to refine continuity and variability of vein mineralization through direct underground record and testwork. According to Kingman, collected material and LiDAR documentation will guide next-step exploration and update current geological models.

What historical assay results from previous Burgex work are cited for Rosebud (KGSSF)?

Past Burgex sampling reported assays up to 688 g/t gold and 468 g/t silver in channel samples. According to Kingman, earlier 2020 grab samples also returned up to 252 g/t Au and 341 g/t Ag from the 100-foot level.

When will Burgex mobilization for the Rosebud reassessment begin for KGSSF?

Burgex crew mobilization is expected on or about March 11, 2026, subject to final safety planning and authorizations. According to Kingman, sequencing and access depend on underground safety and site conditions encountered.

What lab work will be done on underground samples from Rosebud (KGSSF)?

Collected underground material will undergo laboratory mineral processing and metallurgical testing to evaluate oxide versus sulfide response and recoverability. According to Kingman, results will inform processing characteristics and further exploration decisions.