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Outdoor Recreation Could Pose Mesothelioma Risk in California


Outdoor enthusiasts are being warned to steer clear of the trails around abandoned gold mines in California’s Sierra Nevada foothills, or risk mesothelioma and other asbestos related diseases.

A study by The Sierra Fund (TSF) says mountain bikers, hikers and horseback riders in these areas could be in danger of serious health hazards including mesothelioma because of high levels of toxic minerals in the soil around the old mines.  The study, called The Gold Country Recreational Trails and Abandoned Mines Assessment, found many of these public lands to be contaminated with lead, arsenic and asbestos.

According to Elizabeth Martin, CEO of The Sierra Fund, “More than 100 years after the end of the Gold Rush era, the environmental, cultural and health impacts of that time have still not been assessed or addressed. Our study documents that these abandoned mines pose a toxic health threat on public lands that are widely used for recreational activities. The time has come for a serious assessment of abandoned mines, and the public needs to be informed about potential exposure to toxic heavy metals and asbestos in areas with abandoned mines.”

To conduct the study, Sierra Fund researchers collected soil samples from areas around Downieville, Nevada City and Foresthill where the recreational trails intersect abandoned mine sites, mine tailings, and waste rock piles.  Toxins were found in several areas at high enough levels to severely impact human health.  At the Foresthill ‘Off Highway Vehicle’ riding area, soil samples showed asbestos in 40 percent of the soil samples and lead levels nearly 18 times higher than state and federal safe levels.

Asbestos is a naturally-occurring component of the serpentine rock found throughout California. Used for years in industrial applications, in its dust form it has been shown to cause lung cancer, mesothelioma, asbestosis and a host of other health problems. Although industrial workers now follow strict safety precautions when working around asbestos, casual recreation enthusiasts may be unaware of the danger.  Because off-road vehicles, bikes and hiking boots can stir up dust, The Sierra Fund warns that asbestos can be freely inhaled by people hoping to enjoy the ‘fresh air’.  The greater and more frequent the exposure, the greater the statistical likelihood of one day being diagnosed with mesothelioma or another asbestos related disease.

The Sierra Fund announced the results of the study on the steps of the California state capitol building in Sacramento.  The group says additional assessment of California’s many outdoor recreational areas is ‘urgently needed’. A spokesman for the Central California division of the Bureau of Land Management says the mining areas would be nearly impossible to clean up because there are so many of them and because the minerals are so abundant in the soil. The Sierra Fund is pushing for warning signs and, in some cases, restricted public access.


“TSF study reveals potential for health exposure while recreating on Sierra Nevada public lands”, June 22, 2010. The Sierra Fund website. Accessed July 21, 2010.
Zito, Kelly. “Several Sierra trails are toxic, group says”, June 23, 2010.  The San Francisco Chronicle.

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