Meet the Team
DR. DEAN PETERSON, PHD – CHIEF GEOLOGIST
Dr. Dean Peterson brings over 35 years of experience in economic geology to his role as Chief Geologist at Big Rock Exploration. With a Ph.D. from the University of Minnesota, Dean has a rich background that spans government, academic research, and industry. His expertise includes geologic mapping, ore deposit modeling, and 3D geologic modeling. Known for his ability to integrate complex geological, geochemical, and geophysical data, Dean is committed to advancing Big Rock’s exploration efforts. Beyond his technical skills, he is a dedicated mentor to young geologists, helping to shape the next generation of industry leaders.
Aubrey Lee – Vice President of Technical Services
Aubrey Lee is a geologist and VP of Technical Services driven by a passion for innovation and sustainability in the mining industry. With a focus on core logging and petrography, she excels at setting up efficient and productive core shack operations from scratch. Aubrey’s expertise lies in organizing thorough data collection, training collaborative teams, and ensuring operations run smoothly. Inspired by the future of clean energy and responsible mining practices, she is committed to contributing to the industry’s progress. Outside of geology, Aubrey enjoys music and has a wide range of interests in science, arts, and social issues.
Gabriel Sweet – Vice President of Client Services
Gabriel Sweet has over 15 years of experience in mineral exploration, with a focus on early-stage exploration programs across the United States. He holds a master’s degree in economic geology from Lakehead University and is a licensed Professional Geologist in Minnesota. Gabriel’s expertise extends to navigating permitting and compliance at federal, state, and local levels. An active member of the Society for Economic Geologists (SEG) and the Society for Mining, Metallurgy, and Exploration (SME), Gabriel has also served on several industry boards and councils. His commitment to regulatory excellence ensures that Big Rock Exploration operates within the highest standards of compliance.
Chris Nicosia – Vice President of Exploration
Chris Nicosia joined Big Rock Exploration in 2015 as an intern, quickly becoming a key player in the company’s growth. With a background in Geology and Environmental Geosciences from Winona State University, Chris specializes in structure and geochemistry within Proterozoic and Archean Orogenic systems, focusing on skarn and copper deposits. Known for his hands-on approach, Chris tackles everything from staking claims to detailed geological mapping with an ore systems approach. His commitment to mentoring new geologists and his passion for discovery drive his work, whether he’s answering crucial early-stage questions or guiding complex projects from concept to completion. For Chris, the most rewarding aspect of his role is contributing to the larger picture—helping to develop projects that can one day supply minerals to the world.
Bryan Hardel – Vice President of Operations
Bryan Hardel is a geologist and seasoned project manager at Big Rock Exploration, where he excels in managing people and ensuring projects kick off smoothly. With a strong background in fieldwork, drill contractor coordination, and multi-rig project management, Bryan brings valuable experience to early and mid-stage exploration projects. Known for his ability to bridge gaps in management and solve problems on the ground, Bryan believes in involving all team perspectives to achieve success. His extensive experience spans various deposit types, from diamond mining in the Northwest Territories to copper exploration in Arizona. Outside of work, Bryan is dedicated to his family and has a wide range of hobbies that keep him engaged.
Dr. Alex Steiner – Senior Geologist
Dr. Alex Steiner is a Senior Geologist at Big Rock Exploration with over a decade of experience in both industry and academia. Specializing in magmatic Ni-Cu-PGE deposits and the petrology of large mafic magmatic systems, Alex leverages his expertise in geochemistry and petrology to provide technical insights into complex geological problems. He has previously worked with Twin Metals Minnesota LLC and Rio Tinto Exploration. Alex holds a Ph.D. in petrology and a master’s degree in geology from the University of Minnesota Duluth, bringing a deep understanding of magmatic systems to Big Rock’s exploration efforts.
Explore and Discover® with Us
Big Rock Exploration’s team of experienced geologists and technical specialists are ready to jump in and support your project needs. Contact us today!
Meet the BOARD
Rob Bergmann
COFOUNDER, DIRECTOR
Brian Lentz
COFOUNDER, DIRECTOR
Founders’ Story
Big Rock Exploration cofounders Rob Bergmann and Brian Lentz met in field mapping class at Winona State University where they completed their B.S. in Geology. After extensive independent work in the mineral exploration industry all across North America, they soon seized the chance to join forces.
Big Rock was born around a campfire, where Rob and Brian envisioned building a world-class consultancy that leveraged their expertise to deliver exceptional value to clients. What started with a single major miner client has grown to a vibrant consultancy with a client list that has included most of the major mining companies on projects of every commodity type across North America and beyond.
Today, Rob and Brian have handed off Big Rock to the next generation of leadership, but remain involved with the company at the Board of Directors level. To learn more about their other projects please visit the BRI.Group website.