Lion Creek drains Laundry Canyon in the Leona Heights and Crestmont neigborhoods as well as the former Leona Quarry lands. It runs through Mills College, past Evergreen Cemetery, and into the bay at 66th Avenue — it’s the stagnant creek you see from BART just north of the Coliseum.
This is one strand of its headwaters, coming out of a former pyrite mine at the end of McDonell Avenue. The local chapter of the Society for Industrial Archeology says about this mine, the Leona Heights mine, “From the 1890’s to the mid 1930’s, iron pyrite was mined here and at the nearby Alma mine. It was processed into sulfuric acid at the Stege Works of Stauffer Chemical in Richmond (and other sites).” The photo was taken in 2003; I think it’s a little better today. The orange is iron oxides, not especially poisonous, but it looks awful. As I imperfectly understand it, sulfuric acid in the drainage water drops this mineral as it is neutralized. The acid comes from sulfur-eating bacteria in the mine environment.
Yes, Oakland has its own example of the same acid mine drainage that plagues the Appalachian states and many other lands. Every place the pioneers came to, they began mining everything they could, because that was the only way to build civilization. Sulfur is essential for gunpowder, and pyrite was the readiest source. Coal came from the Contra Costa hills, mercury from San Jose and from points north, lime from the San Mateo coast (and the local shellmounds), rock of all kinds from the Oakland Hills. This place was rich in timber and pasturage, we all know, but rich in minerals too.