I visited a silver mine in Guanajuato, Mexico. We followed our guide deep under the ground. He showed us specks of shiny stuff in the walls of the tunnel. The specks were silver, gold, and copper. We had to wear hard hats in case rocks fell on us or in case we hit our heads on the low ceilings of the tunnels. Afterwards, we saw some of the beautiful rocks that come from mines. Aren't they beautiful?
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