. Annual report . he following percentages: Per cent. Silver Sulphur Antimony Iron Arsenic .52 Mr. Burrows afterwards analyzed other samples but with unsatisfactory instance, he found the following percentages of silver: , , , , also proved the presence of lead in samples examined later. In one case he got9 per cent, of lead, and in another only about He found these samples to showconsiderable free silver, which no doubt accounts for the varying percentages of thismetal, and that the mineral did not look the same in all parts, so
. Annual report . he following percentages: Per cent. Silver Sulphur Antimony Iron Arsenic .52 Mr. Burrows afterwards analyzed other samples but with unsatisfactory instance, he found the following percentages of silver: , , , , also proved the presence of lead in samples examined later. In one case he got9 per cent, of lead, and in another only about He found these samples to showconsiderable free silver, which no doubt accounts for the varying percentages of thismetal, and that the mineral did not look the same in all parts, some of it being of adull lustre and other parts bright. Burrows found a specimen of the tetrahedrite, which occurs massive, to possessthe following composition: Per cent. Copper Sulphur Antimony Zinc I roil ( bait none Nickel none Lea<l not det. Total Tetrahedrite has been found in most of the mines at Cobalt. 1913 Cobalt=Nickel Arsenides and Silver Top V; 0 %,a. 27 %fe
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
