MINING GOSSIP.
The deepest shaft in the world is at the Heckla and Calumet copper mine, Lake Superior, America— 4,9ooft. It is now suggested to sink a craft to a depth of 10,000 ft. The temperature is comparatively low in the bottom of the 4,900 ft. shaft, viz., 87.6deg. Fahrenheit. If the heat increases in the same ratio as in the present workings the thermometer at 10,000 ft. would show 117deg. From the deep shaft of the Heckla and Calumet mine it is proposed to drive a level 2,000 ft. long. The Simmer and Jacks mines, South Africa, has a crushing battery of 280 heads. The mill building is 1000 ft, •wide by 270 ft. long, and is 33ffc. Bin. from the floor to the lowest tie beam of roof. The 280 stamps of 1,2501 b. weight are arranged in two rows back to back, in batteries of 20, with a space of lift, between the adjoining king posts of each 20.
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Bibliographic details
Grey River Argus, Volume LVII, Issue 9871, 8 January 1898, Page 4
Word Count
162MINING GOSSIP. Grey River Argus, Volume LVII, Issue 9871, 8 January 1898, Page 4
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