A treatise on ore deposits Volume Ñ‚. 1

 
9781235970085: A treatise on ore deposits Volume Ñ‚. 1
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ... had increased to 11,709 tonnes of ore, worth £23,699; as, however, the Pestarena United-Mines produced in that year gold to the value of £23,580 10s. lOd. it leaves only £118 9s. 2d. as the value of the gold obtained in all the other mines in Italy. In the various valleys running down from Monte Rosa, such as those of Antrona, Anzasca, Sesia, &c, there are numerous mineral-bearing veins, either in the gneiss of Monte Rosa, or in the zone of contact between the gneiss and dioritic schists.3 A company known as the Monte Rosa Gold Mining Company, Limited, has commenced mining operations by drifting upon a well characterised quartz vein encased in gneiss. In 1894 dredging operations were commenced for the treatment of the sands of the river Ticino. The plant was not quite in 1 Reports of the Pestarena United Ootil Minimj Comjxiiii/, Limited, for 1894 and 1895. 2 G. Jervis, Del? Oro in Katura, Turin, 1881, p. 68. 3 Rivuta dtl Strcizio Minerario net 1894, p. 271. thorough working order, nevertheless 1,100 cubic metres of sand were excavated and 485 grammes of gold were obtained (about grains to the cubic yard). Operations are to be resumed in 1895, when it will be seen whether this industry is likely or not to prove an enduring one.1 Silver.--The first silver ores were discovered in 1870 at the Monte Narba Mine, on the eastern coast of Sardinia,2 where the metal occurs in the native state, as sulphide, and sometimes as horn silver, or as pyrargyrite. Silver is now obtained from the mines of Monte Narba, Giovanni Bonu, Bacu Arrodas, and Correboi, in the east, and from Perda San Oliu, in the west, of the island, in the neighbourhood of Sarrabus. At Monte Narba the lode, about a metre wide, occurs in Silurian clay slate in the vicinity of porphyr...

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