. The Canadian naturalist and geologist. Natural history -- Periodicals. Macfarlane on the Acton Copper Mine, 449 of sliale b having been previously taken down) in the south- westerly half of the opening, along a distance of about sixty feet and to an additional depth of seven feet.* The limestone was more, or less charged with ore along the whole of this distance; but hav- ing in view the disadvantages which attend such large excavations in depth, it was resolved to sink a shaft, in order to examine the Section along the line a—h of the general plan. A, Hill limestone ; B, underlying sh
. The Canadian naturalist and geologist. Natural history -- Periodicals. Macfarlane on the Acton Copper Mine, 449 of sliale b having been previously taken down) in the south- westerly half of the opening, along a distance of about sixty feet and to an additional depth of seven feet.* The limestone was more, or less charged with ore along the whole of this distance; but hav- ing in view the disadvantages which attend such large excavations in depth, it was resolved to sink a shaft, in order to examine the Section along the line a—h of the general plan. A, Hill limestone ; B, underlying shale ; C, cupriterous limestone ; D, hanging shale. ground before hand. Accordingly shaft No. 4 was commenced in the south-west end of the working, and sunk, at intervals, to a depth of seventy-five feet on the inclination of the bed. The first twenty-five feet sunk below the open working was in rock con- taining very good ore, of which rock eighteen and a half cubic fathoms were excavated, and yielded— If 3 5 2 t^°s of first quality ore of per cent of copper. 133|i " crush " " « These quantities correspond, after deducting the loss in dress- ing the crush ore (one-third of the copper contents), to tons of 12 per cent ore, or about one ton per cubic fathom. The of sinking these twenty-five feet, and bringing the rock to the surface, amounted to ; or to per cubic fathom of rock, and per ton of 12 per cent ore. Below the twenty- five feet the ground was poor; and in June, 1862, the sinking was discontinued, in order to the stoping of the ore ground on each side of the shaft. Up to the end of July, cubic fathoms • It is to be remarked with regard to this and other sections in this paper, that unless when otherwise mentioned, they are not drawn to a scale, and are merely intended to give an idea of the succession of the rarious rocks, without reference to their thickness. Can. Nat. 29 Vol. VII,. Please note that t
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