著者

井澤 一郎 氏家 英明

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.100, no.1160, pp.944-948, 1984-10-25 (Released:2011-07-13)

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Nakatatsu Mine, which is located nearly in the central part of Honshu Island of Japan, is a lead and zinc mine, where pyrometasomatic lead and zinc deposits in skarn masses have been mined.The annual output of crude are in this mine is 410, 000 tons with the average grade of 25 grams per ton silver, 0.38 percent lead and 5.38 percent zinc respectively.The lead and zinc concentrates prepared here are processed at the smelting and refining plants of Mitsui Mining & Smelting Co. Ltd. In 1973, a trackless mining system was introduced into Nakatatsu Mine and to secure more increase in are production, various improvements for the mining facilities such as streamlining its transportation network and various large-sized rock drilling machines were also carried out.Basing on such improved technologies, a mechanized cut and fill method was employed and as a result, the total efficiency per man-month has risen to 227 tons in 1982 from 189 tons in 1973.