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Show rxMMATION OF SILVER MINES. Row Nat tire Accumulates the Great Stores of Valuable Ore. The process by which nature forms ber silver mines is very interesting. It must be remembered that the earth' crust is full of water, which percolates everywhere through the rocks, making Bolutions of elements obtained from them. These chemical solutions tako up imall particles of the precious metal, which they find hero and there. Sometimes Some-times the solutions in question are hot tho water having got so far down as to bo set boiling by the internal heat Oc the globe. Then they rush upward, picking up the bits of metal as they go. Naturally heat assists the performance of this operation. Now and then the streams thus form, ed, perpetually flowing hither and thither thith-er below the ground, pass through cracks or cavities in the rocks, where they deposit their loads of silver. This ts kept up for a great length of time-perhaps time-perhaps thousands of years until th6 fissure or pocket is filled np. Crannies permeating the stony mass in every direction di-rection may become filled with the precious pre-cious metal, or occasionally a chamber may be stored full of it, as if a million hands were fetching the treasure from all Bides and hiding away a future mine for some lucky prospector to discover ix wiother ago. PitsbuxiZ PiKnatch. |