Page:Transactions of the Geological Society, 1st series, vol. 1.djvu/173

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C. Of Alluvial Depositions of Ores.

I agree with many mineralogists in the opinion that these accumulations of ore have been originally true veins, worn down and removed by some cause or other from the place where they were formed; that they have been water-worn, and carried to a greater or less distance, where they have been covered by alluvial soil. These washed ores occur every where in similar situations, either in a plain, or in open and very low-lying vallies, in beds or strata, which are generally at a small depth below the surface of the ground, and often