OCR Text |
Show Lead Is Found So Deep j That Man Cannot Mine It Durham. England. Lead deposits go deeper than man can mine them, according to findings recently published pub-lished by Dr. Arthur Holmes, noted British geologist, in Economic Geology. Geol-ogy. Formerly It was believed that lead veins were closely related to the rocks containing them, but Dr. j Holmes finds the lead in many rocks differs from lead in veins and is actually a different kind of lead, j having a difTercnt atomic weight. Basing his conclusions on the ! studies of radioactivity which he-has he-has been making for many years, j Dr. Holmes has learned that rock , lead (not in veins) contains the ! products of radioactive disintegration, disintegra-tion, while vein-lead, the material mined and sold, does not contain radioactive end-products. It therefore there-fore appears, according to Holmes, that vein-lead docs not have its source in the rocks surrounding the veins, but in some deeper zone. |