Transactions . Fis?ure completely ill , limestone. B, red clay. C, drybone. D, cahuiiine. E, galena. F, heavy spar. In these cave openings mining is carried on with much ease andlittle labor, as the contents are all removed without blasting, and Fig. Fissure partly , clay. B, drybone. C, brown hematite. D, galena. E, calamine. 124 LEAD ORES IN MISSOURI. when the caves are four or five feet high and several in width,all blasting can be dispensed with. In some of these caves the cala-mine occurs in such quantities that the mining for the zinc yieldslarger returns than that for
Transactions . Fis?ure completely ill , limestone. B, red clay. C, drybone. D, cahuiiine. E, galena. F, heavy spar. In these cave openings mining is carried on with much ease andlittle labor, as the contents are all removed without blasting, and Fig. Fissure partly , clay. B, drybone. C, brown hematite. D, galena. E, calamine. 124 LEAD ORES IN MISSOURI. when the caves are four or five feet high and several in width,all blasting can be dispensed with. In some of these caves the cala-mine occurs in such quantities that the mining for the zinc yieldslarger returns than that for lead. The pipe-vein (Figs. 19 and 20) and stock-werk are very similarin character, with the exception that the former is more originated, no doubt, in the same way as the cave openings. Fig. 19.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
