From the 1850's into the 1970's mercury deposits were mined in the upper Cache Creek and Putah Creek watersheds and processed to produce the elemental form known as “quicksilver.” Mercury mined in this region was used during the Gold Rush throughout much of the Sierra Nevada to amalgamate and recover gold particles from ore and placer deposits. More recently, mercury was mined during World War II for ammunitions and in the 1950-1970 period when mercury was used in hearing aids. For more background information CLICK HERE.
Impaired Water Bodies & TMDLs in the Region
Most water bodies in the Cache Creek and Putah Creek watersheds are listed as impaired. The current list of such water bodies is available HERE. TMDLs (Total Maximum Daily Loads) have been developed already for Clear Lake and for Cache Creek below Clear Lake. Documents regarding these regulatory programs are available HERE.
KEEP UPDATED ON THIS PROGRAM:
CLICK HERE to join the listserve for this specific program. Note: the link at the bottom of the webpage is for Tuleyome's email blast, not for information on this program.
CORONA AND TWIN PEAKS MINE
DRAINAGE TREATMENT PROJECT
Tuleyome is implementing in 2016-2018 a $2.4 million dollar grant by the California Department of Fish and Wildlife's Ecosystem Restoration Program (ERP) to address drainage waters from the Corona and Twin Peaks Mines in northwest Napa County. Additional, related work is being funded by the Corona/Twin Peaks Historical Assoc., LLC, and the Napa County Regional Park and Open Space District. This page and its attachments contains information about the project. CLICK HERE for a PDF report with more information about the Corona and Twin Peaks mines.
Project goals are to (1) render the project site safe for public use; and (2) support healthy aquatic ecosystems downstream in James Creek, Pope Creek, Lake Berryessa, lower Putah Creek, lower Yolo Bypass, and the Delta.
Project objectives are to (1) improve the effectiveness of existing mine drainage treatment systems for the Boiler House and Twin Peaks entrances [referred to as “adits”]; (2) minimize leaching and mobilization of nickel and acid drainage from the mined ore body through the Corona Drain Tunnel; and (3) address physical and chemical hazards on the site.
CLICK HERE to view a brief presentation about the project.
Click on the name of any link listed below to access the link.
- Join the project listserv to receive project updates.
- Abandoned Mine Lands Report to the CA state legislature.
- American Forests Magazine article on mercury in forests.
- Cache Creek Discovery Report.
- Central Valley Regional Water Quality Control Board.
- CERCLA-Good Samaritan Administrative Tools.
- Delta Tributary Mercury Council.
- Difficulties with abandoned mines and suggestions on dealing with regulatory constraints.
- Fish Consumption Advisories and Safe Eating Guidelines by California’s Office of Environmental Health Hazard Assessment.
- Statewide Mercury Program for addressing mercury in California's waters.