大土森鉱山（おおどもりこうざん）は宮城県栗原市にあった鉱山。 金・銀・鉛・亜鉛が採掘された。 細 倉鉱 山の北部 は以前には 横田鉱業(株)により稼行されており、昭和44年に三菱金属(株)が休山中の大土森鉱山を買収、 細倉鉱山と一体化された。 地図位置付近に鉱山集落があったらしい。
Omori-mori mine (Oohmori Kozan) was a mine in Kurihara city, Miyagi prefecture. Gold, silver, lead and zinc were mined. The northern part of the Shimokura mine was previously operated by Yokota Mining Co., Ltd., and in 1943 Mitsubishi Metal Corporation acquired Mokomori mine which is closed and was integrated with Hosokura Mine. It seems there was a mine settlement near the map position.