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Tag: Sierra Nevada

  • Drought Gold Rush Brings Prospectors to California

    “A mine is a hole in the ground with a liar standing next to it, down which you throw money.” – attributed to Mark Twain

    The San Bernadino Sun reports that one of the worst droughts in California history, one that is forecast to bring dangerous wildfires this summer, has had another surprising effect in the Sierra Nevada mountains near Colfax, Califormia. People are showing up in droves to pan for gold in the foothills areas.

    Apparently, low water levels are exposing ground areas that have not been accessible since the gold rush days of the 1800’s. Hobbyist prospectors are buying equipment and heading out toward areas like the Bear River with hopes of striking it rich.

    “With the drought going on, we’re able to dig in more locations that wouldn’t be accessible at later times,” said Tim Amavisca.

    Amivasca has been able to prospect in areas that are normally under water. “If you see a good-sized flake, that’s when you get excited,” said Amavisca.

    The lowered water levels have even revealed an old mining town called Mormon Island that had long been submerged.

    Some avid amateur prospectors are quick to point out, however, that these gold rush participants don’t have much hope of actually getting rich off what they may find around Bear River.

    “It’s called placer gold, and it is fun to find,” remarked one reader who goes by the username Bubba. “Most everyone will find some if they go to the places known for finding it. You won’t get rich and will spend more on GAS and the day trip than any gold you find.”

    However, as another reader points out, even that is not such a bad deal.

    “Only 1% of those who venture into the Gold Prospecting Hobby will ever find enough gold to actually turn a profit from the expenses involved in this pastime,” says Just Moi. “But you could add several years to your life by being outdoors, being more physically challenged and by being away from your computer desk. Eureka!”

    Image via Wikimedia Commons

  • Mercury From Gold Rush Contaminating Wildlife Today

    Gold mining has been called “the gift that keeps on taking” by geographer Gary Brechin, and the damage to California will possibly last ten millennia. The LA Times and USA Today report that the hydraulic mining practices of gold rush-era miners in the mid-to-late 1800s deposited mercury-laced sediments throughout the Sacramento Valley and deep into the San Francisco Bay. Even though the practice stopped, the damage remained, and the mercury washed down from the Sierra Nevada mountains.

    The paper, authored by Michael Bliss Singer, et al, from the Earth Research Institute at UC Santa Barbara and published in the Proceedings of the National Academy of Sciences, analyzed the process by which sediment deposits form downriver.

    By studying the historical streamflow and topographical data of 105 sites along the Yuba River, they were able to run computer modeling to gauge sediment distribution. Their conclusion was grave: large stores of undiluted mining debris are still present in the floodplains, and any major flood could wash the pollutants downstream for the next 10,000 years.

    Because the Yuba is downstream from several abandoned gold mines, the scientists felt it was an appropriate site choice, and they also noted that huge amounts of mercury were washed downstream in the huge floods that took place in 1986, 1997 and 2006.

    “[We have a] romantic view of the Gold Rush, which is old guys roaming around with pans of gold. It was really an industrialized operation run by engineers,” Singer said. “[But over 100 years later,] the problem [is] much, much bigger than (many others) are suspecting it is.”

    The scientists were unable to investigate how far downstream the mercury goes, but a Duke University geochemist not attached to the study, Gretchen Gehrke, said the information they uncovered is valuable for estimating how much mercury reaches the lowlands. She contended that evidence exists of mercury’s polluting effects on ecologically diverse areas that represent stopovers for millions of migrating bird species.

    “Sediment-bound Hg has contaminated food webs of the San Francisco Bay-Delta, but the dominant geographical sources of Hg to downstream ecosystems in this and similar river basins are debated,” the Academy writes of the study’s significance. “This research addresses a gap in generic theory of postmining fan evolution that enables anticipation, prediction, and management of contamination risk to food webs.”

    [Image via this YouTube video about the effects of gold mining on San Francisco]