Principal Resource Geologist

Date: Sep 15, 2026

Patagonia, AZ, US, 85624

South32 Group Operations Pty. Ltd.

• Discover a Brighter Future
• At South32, we’re meeting the challenge of enabling a sustainable future through our focus on responsibly producing commodities critical for a low-carbon world.

As a collaborative, caring and inclusive company, there’s no better place to make a genuine difference. Together we’re making a positive, global impact that has the potential to change lives.

Whatever career path you choose, we’ll support you every step of the way to learn, grow and succeed. So join us, step towards a brighter future and leave your legacy.

ABOUT Hermosa

Hermosa, located approximately 75 miles south-east of Tucson, Arizona, is the only advanced mining project in the United States as of 2023 that could produce two federally designated critical minerals—manganese and zinc—as well as silver and lead. The project has the potential to help power the nation’s clean energy future, strengthen the domestic supply chain of critical minerals, grow the local economy, and improve lives in Santa Cruz County and the surrounding community for generations to come.

ACERCA de Hermosa

Hermosa, ubicado a aproximadamente 75 millas al sur este de Tucson, Arizona, es el único proyecto de minería avanzada en los Estados Unidos hasta la fecha que puede producir dos minerales designados como críticos por el gobierno federal: manganeso y zinc, así como también plata y plomo. El proyecto tiene el potencial de ayudar a impulsar el futuro energético limpio del país, reforzar la cadena de suministro nacional de minerales esenciales, hacer crecer la economía local y mejorar la calidad de vida en el condado de Santa Cruz y en las comunidades aledañas para las generaciones venideras.

WHAT SOUTH32 OFFERS

• Annual short-term incentive bonus that recognizes both your individual performance and the overall success of the business.
• When you choose to contribute more into your retirement savings, South32 will match it up to a certain percentage.
• South32 provides you with 4 weeks paid time off.
• 12 weeks full-paid parental leave for primary careers and 2 weeks full-paid parental leave for secondary careers

ABOUT THE ROLE

As the Principal Resource Geologist , you will lead and oversee all Mineral Resource modeling activities for the Hermosa Project, ensuring the delivery of high-quality geological interpretations, resource models, and Mineral Resource estimates. This role is responsible for maintaining data integrity, applying industry best practices in resource estimation, and supporting critical business decisions through accurate resource evaluation and reporting. This role works closely with exploration, mine planning, geotechnical, metallurgical, and operational teams to define and enhance the project's mineral inventory and resource base. This position is based at the Hermosa Project site near Patagonia, Arizona.

Other key responsibilities include, but aren’t limited to

• Defines the mineral inventory and resource base for our operations and ensures internal and external reporting requirements are met
• Assists with the development of exploration work programs
• Provides geoscientific expertise to the operations and other functions as required by the business
• Undertakes the timely reporting and declaration of Mineral Resources

ABOUT YOU

• You will have experience and demonstrate capability in the following:
• B.Sc. or higher in Geology (or equivalent)
• Minimum 15 years of geology experience including experience in resource geology as well as exploration and mine geology.
• Experience acting as a Mineral Resource Competent Person (or equivalent).
• Multiple commodity experience desirable.
• An advanced understanding of the principles of exploration and mine geology.
• Knowledge of sampling theory, sampling, and drilling techniques.
• An advanced understanding of exploratory data analysis, geostatistics, resource modelling and estimation.
• Strong understanding of the JORC code.
• An understanding of mineral economics, discounted cash flow analysis including the modelling of uncertainty.

South32 is committed to building and maintaining an inclusive and diverse workforce that reflects the communities in which we operate. We provide a recruitment process that is fair, equitable and accessible for all and we encourage candidates from all backgrounds to apply.

South32 está comprometido a cimentar y mantener una plantilla de trabajadores diversa e inclusiva que refleje las comunidades en las cuales trabajamos. Proporcionamos una proceso de contratación que es justo, equitativo y accesible para todos y alentamos la aplicación de candidatos de todas las procedencias.

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