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aerated concrete block coal mining

Jul 04, 2011 The coal in the mine was Carboniferous, which would mean the wall was at least 286 million years old. According to Mathis, the mining company officers immediately pulled the men out of the mine and forbade them to speak about what they had seen. Mathis said the Wilburton miners also told of finding a solid block of silver in the shape of a ...

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