MINING.
Brazil now boasts-the deepest mine in the . : world, at St. John del Rcy. Tie Engineering and Mining Journal-Press (New York) saye that recently it has attained a vertical depth, of 6726 ft, where the temperature of the rock o 8 _F., necessitating a system of artincial cooling on a large scale. . Tills has proved successful, but the ateplike aeries of ■ 1 shafts and levels by which the bottom stopea are reached has become so cumbersome as to involve an excessive cost in hoisting and ven- - tilation. A more direct, entry, by means of a vertical shaft, is being considered. Last - year was the most successful in the companya history at any rate, since 1884, 'when the ■ ■ mine was a comparatively young prospect. Further, the ore in the bottom workings shows no signs of a decrease in gold content, ■ ■- so that the St. John del Eey constitutes a ■ remarkable exception to the usual impoverishment of lodes in depth. ,/
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https://paperspast.natlib.govt.nz/newspapers/ODT19230531.2.78
Bibliographic details
Otago Daily Times, Issue 18876, 31 May 1923, Page 9
Word Count
158MINING. Otago Daily Times, Issue 18876, 31 May 1923, Page 9
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