A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . n very productive of metalliferous matter, and whichhave consequently been removed. The term counter or caiinter lode is given to such lodesas dip at a considerable angle with the direction of the other lodes in its vicinity. Such alode is shown, (fig. 433,) which is, however, inserted principally to explain that where the underlie of the lode is great, a vertical shaft is sunk at some distance from it on the sur-face, so as to cut (intersect) the lode at some d
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . n very productive of metalliferous matter, and whichhave consequently been removed. The term counter or caiinter lode is given to such lodesas dip at a considerable angle with the direction of the other lodes in its vicinity. Such alode is shown, (fig. 433,) which is, however, inserted principally to explain that where the underlie of the lode is great, a vertical shaft is sunk at some distance from it on the sur-face, so as to cut (intersect) the lode at some depth, in this instance at 70 fathoms belowthe adit-level. As the inclination of the lode then alters, the shaft is continued on thelodes. Another fissure or lode, sometimes called a ^^ dropper, is seen to take nearly avertical direction from the 50-fathom level, and from the shafts levels are driven into thislode, at about evcrv 10 fathoms. 756 MINING. Fig. 435 represents in plan the underground workings of a Cornisli mine. Those whoare not familiar with mining are requested to suppose that the earth is transparent so as to 432. enable us to see the levels worked at variousdepths, from the adit-level—through whichthe water pumped from the mine is dis-charged—to the 125-fathom level below levels arc numbered in the plan. Theyare not worked immediately under one ano-ther ; but, as the lode inclines, in the sameway as is shown in the Caunter Icde, {,) they follow in position this underlieof the lode. The dark lines and the dottedlines crossing the numbered lodes, are work-ings upon lodes, running in a contrary di-rection to the lode principally shown. Thisplan shows the junction of the granite withthe killas or claii-4ate of Cornwall, and theoccurrence of elvan courses is shown at thediiferent levels. By studying the plan, with 433 fKD/T LBVEL
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
