First ... Copiapo, for a very sappy took pictures of the mine roofs to see the rock strength and fortifications. In Galleguillos (more artisanal mining) had no support in parts and how to drill and let the rock thunder striking reasons (for me xD Bakane! Thinking that the majority is always pure and formless stone chips )
definitely do not look like the roof of a tunnel.
more inches in Santiago gave
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