TIN MINING IN AMERICA.
" Harper's Monthly " for February has an article on Dakota and its wonderful resources and incidentally refers to the tin mine in the Black Hills. As the information has a bearing on the Stewart Island mines we reproduce it :— " The tin stone is found in granitic veins sometimes hundreds of feet in width, and yields from 2to 4 per cent. By comparison with foreign tin mines it will be seen that this percentage is unusually heavy. It may not be generally known that the tin mines of Saxony only return a yield of from h to 1 per cent., and that from those of Cornwall is less than 2 per cent. Professor Frank R. Carpenter, dean of the Dakota School of Mines, Rapid city, U.S.A., has demonstrated by recent tests that this tin can be separated from the encompassing rook by the very simple process of jigging, the machinery to accomplish this costing but a comparatively small sum." The same article states that mica is found abundantly, and is mined for commercial uses.
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Bibliographic details
Otago Witness, Issue 1955, 9 May 1889, Page 12
Word Count
176TIN MINING IN AMERICA. Otago Witness, Issue 1955, 9 May 1889, Page 12
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