Cambrian, Ordovician and Silurian beds have been recognized, the Upper Cambrian consisting of a limestone which is very rich in metalliferous ores (especially galena and calamine). [Please select]
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It is a general rule that metalliferous veins running parallel with the strata of the bed-rock or country are not extensive. [Please select]
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_--The quarrying of quartz rock differs little from the quarrying of other metalliferous vein-stones. [Please select]
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