About Marcio Fonseca

Marcio Fonseca founded GR Silver Mining in 2018 with the aim of discovering high-grade silver projects in the Rosario mining district of Sinaloa, Mexico. He took the Canadian-based junior mineral exploration company public. As of March 25, 2026, Fonseca is no longer the President, CEO, or Founder of GR Silver Mining.

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•By Alejandro Cremades

Marcio Fonseca, Founder of GR Silver Mining

About Marcio Fonseca

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