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笹ヶ谷鉱山 (Sasa Ke Tani Kōzan)

笹ヶ谷鉱山(ささがだにこうざん)は、かつて島根県(旧石見国)津和野町にあった銅、亜鉛等の鉱山で、1971年5月(昭和46年)に完全閉山し現在は廃鉱となっている。 当初は銅を主たる産物としていたが、銅や亜鉛などの金属とともに、殺鼠剤(ネズミの駆除剤)の原料となる砒素(ヒ素)を副産物として産出したため、江戸時代には、むしろ砒素を主たる産物とするようになった。 江戸時代にヒ素を用いた殺鼠剤を商品化する際、当時、国内屈指の大銀山として知られていた「石見銀山(大森銀山)」の名を冠して、「石見銀山猫いらず」として売られたが、石見銀山では砒素は産出しない。 江戸時代に入り、石見銀山の産銀量が衰えるに伴い、「石見銀山」の名前は銀山としてよりも、殺鼠剤としての知名度を得るとともに、石見銀山が砒素の鉱山であるかような誤解を招いた。 現在でも旧笹ヶ谷鉱山周辺の残土や旧坑道からの排水には砒素が含まれており、コンクリート製の堰堤が築かれるなど、大規模な鉱害防止対策が施されている。 地図は七番坑跡のおおよその地点。

Sasagogaya mine

Sasagaya mine (Sasagaya mine) was a mine, such as copper, zinc, etc. which was once in Tsuwano cho, Shimane prefecture (former Iwami country), closed completely in May 1971 (now Showa 46) It has become abandoned mine. Initially, copper was the main product, but arsenic (arsenic), which is a raw material for rodenticide (a rat control agent), was produced as a byproduct together with metals such as copper and zinc, so in the Edo period, rather arsenic was the main product It was way. At the time of commercializing rodenticide using arsenic in the Edo period, it was sold as "Iwami Ginzan Catsumori" with the name of "Iwami Ginzan (Omori Ginzan)", which was known as the biggest silver mine in the country at the time However, arsenic does not produce in Iwami Ginzan. In the Edo era, as the amount of silver in Iwami Ginzan declined, the name "Iwami Ginzan" gained notoriety as a rodenticide rather than as a silver mountain, and also caused a misunderstanding that the Iwami Ginzan is an arsenic mine There was. Even now, arsenic is contained in waste water surrounding the old Sasagaya mine and drainage from the old galleries, and large-scale measures against mine pollution have been applied, such as concrete dams being built. The map is an approximate point of the seventh mine track.

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