Steel exports also increased in the first four months while imports were flat, industry data shows.
The Goldsource Mines project is currently in a prefeasibility stage that is due to be completed in the second half of this year.
Companies issue updates relating to silver, copper and gold assets in Mexico, Chile and Ecuador.
Companies in Ecuador, Mexico and Argentina provide updates on their exploration programs.
Southern Copper believes its long-delayed Peru copper-silver project is inching its way closer to securing vital permits.
Vancouver-based companies operating in Brazil, Mexico and Guyana publish updates on their exploration programs.