Geological Survey of Japan Reports of Progress for 1878 And 1879

Cover Geological Survey of Japan Reports of Progress for 1878 And 1879
Geological Survey of Japan Reports of Progress for 1878 And 1879
Benjamin Smith Lyman
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The tin vein would seem to be very thin ; but was mined from the Temmei period (1781-1788) until about 1873. The Kinra tin mines were still older. Obira and Kiura toge- ther yielded 200 piculs of tin a year, and even 394 piculs in 1825 (12th year of Bnnsei). At Obira there was much arsenic present, and the ore had to be roasted 30 days ; at Kiura there was none. At Kiura the copper ore is said to be in small pockets up to two feet in diameter, scattered irregularly through the rock without any ...proper vein. The country rock there is likewise a grit but rather coar- 185 ser and flaggy or shaly, so that it is easily split down. A little copper is still made at Obira from the Hachimanya- ma and a little at Hibira near Kiura in the edge of Hinga, and at Uchinokuchi, north-east of Kiura, galena (said to be in scattered masses 0. 2 ft. Or 0. 5 ft. In diameter) and cerussite are worked now, but only by a single family of miners. It is said that native silver also occurs some- times with the galena.

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