About Us

At South32, our purpose is to make a difference by developing natural resources, improving people’s lives now and for generations to come. We are trusted by our owners and partners to realize the potential of their resources.

South32 produces minerals and metals critical to the world’s energy transition from operations across the Americas, Australia and Southern Africa and we are discovering and responsibly developing our next generation of mines, including investing heavily in growing our presence in North America. We aspire to leave a positive legacy and build meaningful relationships with our partners and communities to create brighter futures together. Learn more:

Meet the Hermosa Project Team

Pat Risner

Hermosa President, South32

Pat Risner is an industry expert in complex mine project planning and development. He has held executive roles across the United States and Australia including Group Health Safety Environmental Officer for BHP, formerly BHP Billiton, where he had direct accountability to the company’s sustainability committee of the board of directors. As a seasoned leader, Pat brings a wealth of knowledge regarding sustainability, long-term economic development through mining, communities, and Tribal relations to the Hermosa project. He holds a degree in Mining Engineering from Missouri University.

Andy Thompson

Hermosa Project Vice President, Project Delivery

Andy Thompson is accountable for Hermosa project delivery, including studies, construction and execution, health and safety, and tailings management. With nearly two decades of experience in the mining sector, primarily at Barrick Gold, he brings international capital project experience developing greenfield underground mines and serving in leadership roles on brownfields expansions and recapitalizations.

Judy Brown

South32 Head of External Affairs, Americas

Judy Brown has oversight of external affairs for South32’s assets across the Americas, including and particularly the Hermosa project. She is an established and highly sought-after strategic government and community affairs expert, accomplished in managing complex international, national, and local issues of policy and reputation. Prior to joining South32, she served in multiple chief external affairs roles for Rio Tinto, most recently as Chief Adviser, External Affairs, in Latin America and the Asia Pacific region.

Brent Musslewhite

Hermosa Project Director of Environment and Permitting

Brent Musslewhite is an expert in U.S. mine permitting, feasibility studies, due diligence, mine reclamation/remediation, and closure. A former Manager of Legacy Assets and Manager of Environmental Services for BHP in both Arizona and New Mexico, he now directs the environmental and permitting team for the Hermosa project, leading on complex environmental permitting and studies, regulatory compliance, and relationship management with regulatory stakeholders at both the state and federal level.

Todd Gwillim

South32 Legal Manager, North America

Todd Gwillim joined South32 soon after acquisition of Hermosa as the company’s first in-house legal counsel in North America and currently manages all legal matters in this jurisdiction. With over 22 years delivering commercial and regulatory legal counsel to large multinational corporations, he has extensive success leading diverse legal teams to support a wide range of functions including manufacturing, logistics, energy, mining, and product development. Prior to joining South32, he worked for 19 years within the global legal function at Caterpillar Inc. in the US and in Asia.

Skylie Estep

South32 Human Resources Director, North America

Skylie Estep provides strategic human resources leadership across South32’s assets in the Americas, including Hermosa. Her significant expertise in pinpointing people whose passion, purpose, proficiency, and potential will be key to creating a next-gen mine at Hermosa has been built through increasingly senior operational and corporate roles exclusively within multinational mining organizations, including South32, Barrick Gold, and Newmont.

Jenna Tan

Hermosa Project Director of Finance

Jenna Tan leads the finance and valuations team at the Hermosa project. She previously held senior roles in finance, business analysis, corporate development, strategy and performance for global mining majors including BHP, Peabody Energy, and Vale, where she had oversight of operations and projects in Australia, China, and Mozambique. Most recently, she served as the Manager of Strategy and Performance for South32 Group in Perth, Australia.

Project summary

South32 is a global metals and mining company, headquartered in Perth, Australia. We currently have operations in Australia, southern Africa, and South America and are investing heavily in growing our presence in North America. In August 2018, South32 completed the acquisition of the Hermosa project in the Patagonia Mountains, about 50 miles southeast of Tucson, Arizona.

Hermosa is the only advanced mining project in the United States to date 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 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.

Hermosa is a part of a larger critical minerals district, 45,000 acres of private land that includes opportunities to potentially develop copper as well as additional zinc deposits.

We believe by deploying next generation mining technology to sustainably produce these critical minerals—right here in Southern Arizona—Hermosa has the potential to positively impact our community, our state and the country’s energy future.

Read our latest Hermosa project update to the market.

Learn more about the Mining History of Patagonia.