GR Silver Mining CEO Márcio Fonseca passes away
Canadian explorer GR Silver Mining has announced the sudden passing of its president, CEO and director Márcio Fonseca.
Fonseca was a founder of the company and played an important role in shaping its strategy and advancing its operations in Mexico.
He had a career spanning more than 30 years in mining and mining finance, and was a member of both the Association of Professional Engineers and Geoscientists of British Columbia and the Australasian Institute of Mining and Metallurgy.
Executive chair Eric Zaunscherb described Fonseca as a passionate and principled leader whose impact extended beyond the company.
“Our hearts are heavy today with the passing of our dear friend and colleague Márcio,” he said. “Márcio did everything with absolute passion and integrity; his big heart and dedication radiated through our company.”
He added that Fonseca’s legacy included a strong team across Canada and Mexico that would continue to advance the company’s projects.
Following the announcement, the board has appointed Zaunscherb as interim president and interim CEO. He previously held the CEO role from February 2022 to June 2025.
GR Silver Mining is focused on silver and gold exploration in Mexico, where it holds 100% of the Plomosas project, located on the eastern edge of the Rosario mining district across Durango and Sinaloa. The project includes the past-producing Plomosas underground mine and the San Marcial area, which hosts high-grade silver mineralisation.
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