. Ancient mining on the shores of Lake Superior. Copper mines and mining. ON THE SHORES OF LAKE SUPERIOR. 9 In the Porcupine Mountains I have seen works made by the English miners in the years 1769 and '70, where an adit or open cut made in the face of a chfF has been always exposed to the frost and rains. But here the marks of picks and drills appear as fresh and as perfect as if they had been recently made, although in some places the sides of the cut are covered by old lichens and mosses. Copjier Falls Location.—The ancient miners made very extensive excavations on the property of the Coppe
. Ancient mining on the shores of Lake Superior. Copper mines and mining. ON THE SHORES OF LAKE SUPERIOR. 9 In the Porcupine Mountains I have seen works made by the English miners in the years 1769 and '70, where an adit or open cut made in the face of a chfF has been always exposed to the frost and rains. But here the marks of picks and drills appear as fresh and as perfect as if they had been recently made, although in some places the sides of the cut are covered by old lichens and mosses. Copjier Falls Location.—The ancient miners made very extensive excavations on the property of the Copper Falls Mining Company, both upon veins and metallife- rous bands, which run parallel with the formations. By the profile and explanations here given the geological structure of the place will be well understood. Fig. Section on the Copper Falls Vein. Explanations.— \4S^^\ Trap rock. |6fo'°g°o?| Conglomerate beds. \yi-yf-hyH Sandstone.—a a a. Ancient pits on tlie vein.—6 b b. Shafts and galleries of the Sand dunes.—d d. Copper bearing bed of trap. Scale—horizontal and vertical—2 inches to the mile. 1, 6, 7, Nos. of the shafts. This sketch illustrates the geology of the northern part of the range, or of all mines described under the head of Copper Falls Location. From this it wiU also appear that when we use the term extensive, as applied to "Indian diggings," it is only in a comparative sense, and in reference to other works of the old miners. The levels and shafts constructed by the Copper Falls Minmg Company, since 1851, cause the mining of the ancients to appear like mere exploratory pits. On looking at the map, the pits will be seen to occupy a total length of several miles on this location; but none have been reopened that had a greater depth than twenty-four feet, while the modern shaft has already descended more than 250 feet, and the mine has rock galleries of greater total length than all the old trenches of the ancients. In the p
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectcopperminesandmining
