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

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.