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Encyclopedia > St. John's Mine

The St John's Mine is a mineral extraction site approximately three miles north of the city of Vallejo, Solano County, California. The St John's site was used for extraction of cinnabar in the early 1900s.[1] The St. John's Mine is classified as a medium priority mine from the standpoint of environmental oversight.[2] The last inspection of the Hastings Mine occurred in 1997 and found only slight erosion of the considerable mine tailings; however the tailings exceed 10,000 cubic yards of material, or one of the largest cinnabar tailings in the State of California; 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. In 1989, Earth Metrics reviewed old 1918 maps of workings of the Hastings and St. John's Mines and found that mine shafts were not driven into the site prior to the year 1918.[3] Vallejo (pronounced IPA: , vuh-LAY-oe) is a city in Solano County, California, United States. ... Solano County is a county located in central part of the U.S. state of California, about halfway between San Francisco and Sacramento and is one of the nine San Francisco Bay Area counties. ... Cinnabar, sometimes written cinnabarite, is a name applied to red mercury(II) sulfide (HgS), or native vermilion, the common ore of mercury. ... Tailings (also known as slickens[1]) are the waste left over[2] after removing the gangue from ore. ... Quicksilver is a common name for the chemical element mercury, literally meaning living silver based on its appearance and its unusual liquidity at room temperature. ... The Hastings Mine is a mineral extraction site approximately two miles northeast of the city of Vallejo, Solano County, California. ...

Contents

Environmental effects

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.[3]


See also

The Hayward Fault Zone is located in northern California in the San Francisco Bay Area. ... The Hastings Mine is a mineral extraction site approximately two miles northeast of the city of Vallejo, Solano County, California. ...

References

  1. ^ U.S.Bureau of Mines, Mercury Potential in the United States
  2. ^ Oversight of inactive mercury mines in California
  3. ^ a b C.Michael Hogan, Marc Papineau et al., Environmental Assessment of the Columbus Parkway Widening between Ascot Parkway and the Northgate Development, Vallejo, Earth Metrics Inc. Report 7853, California State Clearinghouse, Sept, 1989

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