As a result of the introduction of Western modern mining technology, Ashio copper mine became Japan's largest copper producer and became the largest in East Asia which produced thousands of tons annually. |
さらに西欧の近代鉱山技術を導入した結果、足尾銅山は日本最大の鉱山となり、年間生産量数千トンをかぞえる東アジア一の銅の産地となる。 |