Transactions . e intersection of the black dike and the No. 1and No. 2 dikes, and, as shown in the plans, is divided by the * The outlines of the porphyry dikes in these figures are constructed from ac-tual intersections in the drifts of the mines. The outlines of the ore-shoots, onthe other hand, are necessarily arbitrary, since the ore grades off into slightlyimpregnated quartzite, and there is actually no defined limit between pav-ore andcountry-rock. The point C and the lines running from it in each plan are in thesame vertical planes, and thus show the pitch of the dikes and ore-shoots. T
Transactions . e intersection of the black dike and the No. 1and No. 2 dikes, and, as shown in the plans, is divided by the * The outlines of the porphyry dikes in these figures are constructed from ac-tual intersections in the drifts of the mines. The outlines of the ore-shoots, onthe other hand, are necessarily arbitrary, since the ore grades off into slightlyimpregnated quartzite, and there is actually no defined limit between pav-ore andcountry-rock. The point C and the lines running from it in each plan are in thesame vertical planes, and thus show the pitch of the dikes and ore-shoots. Thethorough and systematic manner in which the mine surveys are kept up at this minerendered it possible to obtain in a few days a clear conception of the undergroundstructure, which, without them, might have involved the labor of many weeks. 668 THE DBLAMAB AND THE HORN-SILVER MINES. intersection of the No. 1 and the black porphyry dike intofour parts, the dikes themselves being barren of mineral. These Fig. Black Porphyry Ore Shoots Fifth Level of Delamar Mine. are called, respectively, the No. 1 shoot; the Northeast, theEast and the Southeast shoots; the No. 1 being on the N¥.sideof the intersection, and that which is first reached by the Fig. 5. Fissure
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
