The St John's Mine is a mineral extraction site approximately three miles north of the city of Vallejo in Solano County, California, United States.
Furthermore, the drainage from St. John's Mine flows to receiving waters of Rindler Creek and thence to Lake Chabot.
Miles of underground shafts were driven in the course of working the quicksilver deposits in the area.
[3] Principal ongoing impact is from mercury contamination of spring water flowing beneath the site; moreover, historical analysis has shown that the volume of spring water itself has been greatly reduced from levels of a century ago.
This reduction of spring flow has come about due to the extensive mine shafts driven to achieve the cinnabar extraction.