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Triumphs and wonders of the 19th century, a volume of original, historic and descriptive writings showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress (1901)

Boyd, James Penny, 1836-1910 · Philadelphia, A. J. Holman & co · leaf 620

An illustration from Triumphs and wonders of the 19th century, a volume of original, historic and descriptive writings showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress, 1901, leaf 620
od obviates the use of timber for holding upthe surface. After the overlying gravel is removed, should the conditions be favorable,the ore is taken out with a shovel. If this cannot be done, some methoddepending on rock-filling is adopted. At the Auburn mine, after strip]>ingand driving the… … 584 TRIUMPHS AND WONDERS OF THE XIX1 CENTURY cones, having their bases at the surface. Additional raises are then madehalfway between the others, and the remaining material extracted. At the Fayal mine they take out rooms twenty-four feet wide by threehundred feet long, with a twenty-four-foot…

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