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Abstract
AFTER a year's intensive study of the surface and underground conditions at the Rio Tinto Mines in the Province of Huelva, Spain, I have been led to a theory as to the origin of the great ore bodies in this region. As this theory or working hypothesis has already borne fruit, inasmuch as it has led directly to the finding of several new ore masses, it is deemed worthy of brief mention here in advance of the full discussion which will appear later.
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