…Since the completion of the Joban Line (then the Japan Railway Coast Line) in the 1890s, coal mining became active due to its proximity to the Keihin Market, and for about 70 years until it was abandoned due to the energy revolution, it had a major impact on the economy of the northern part of the prefecture. Also, the Akazawa Copper Mine, which was opened in the early modern period, did not produce sufficient results during the Edo period, but it developed after being renamed Hitachi Mine in 1905. The establishment of a large-scale smelter sparked the launch of the electrical machinery industry in the 1910s, which became independent as Hitachi Ltd. in 1920. … [Hitachi Mine] …The ore minerals are chalcopyrite, sphalerite, pyrite, and pyrrhotite, but the average copper content is relatively low at about 1.5%, and the sulfur content is about 20%. [Umetaro Yamaguchi] *Some of the terms mentioned in relation to Akazawa Copper Mine are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…1890年代に常磐線(当時は日本鉄道海岸線)が全通して以来,京浜市場への近さから石炭鉱業は活発化し,エネルギー革命による廃山に至るまで約70年間,県北地方の経済に及ぼした影響は大きかった。また近世初期に開坑された赤沢銅山は江戸時代には十分な成果をあげず,1905年日立鉱山と改称してから発展した。大規模な精錬所が設置されたことが口火となって,1910年代には電気機械工業が発足し,20年日立製作所として独立した。… 【日立鉱山】より…鉱石鉱物は黄銅鉱,セン亜鉛鉱,黄鉄鉱,磁硫鉄鉱であるが,平均的な銅品位は比較的低く1.5%程度であり,硫黄品位は20%程度であった。【山口 梅太郎】 ※「赤沢銅山」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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