Helen Mercury Mine - Abandoned Mine Lands Project

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Photo 1: Mine effluent from main adit portal located to the left of photo.  The brown sediment extends about 100 feet from the portal where it enters an erosional gully on route to Dry Creek.  The content of the white precipitate has not yet been determined.  During the late summer season, a whitish mineral precipitate forms on the surface of the mine tailings and then is subsequently washed away by winter storm events into Dry Creek, an ephemeral stream tributary of Upper Putah Creek.