Andes Gold Corp (AGCZ)

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The Miranda mine was originally owned by a mining individual who held ownership of the property for over thirty years. Some rudimentary tunnels and mining activity took place over this period, but no significant volume of ore was extracted. In the beginning, Compañia Minera PL S.A utilized the existing mining works, tunnels, raises, and shafts to access the gold bearing veins. These tunnels have been improved by the utilization of advanced engineering technology to serve the mining requirements of the company.

http://andesgoldmine.com/history.html