Arsenic, lead, zinc, and antimony in a National Park? Removal of contaminated soils proposed at Gold Hill Mill in Death Valley
DEATH VALLEY, CA – The National Park Service (NPS) seeks public feedback on a proposal to remove contaminated soils from Gold Hill Mill in Death Valley National Park.
The mercury amalgamation mill was in use from the 1930s through the 1950s in Warm Springs Canyon in the southern end of the park. The mill site includes a well-preserved mill and arrastra. It is easily visited via the unpaved Warm Springs Road and is near a perennial stream.
Environmental analysis shows high levels of arsenic, lead, mercury, zinc, and antimony in the waste piles and the soils at the mill’s foundation. The site can pose a health risk for people who visit repeatedly or spend more than a passing amount of time there. It provides a greater risk to wildlife, exceeding wildlife’s safe exposures to lead by 130 times, zinc by 202 times, and antimony by 327 times.
The NPS proposes to remove about 50 cubic yards of contaminated soils from the mill foundation and waste piles. The materials would be disposed of in an appropriately licensed landfill. If this action is selected, more detailed design will be necessary to minimize risk of impacts to historic structures, such as the mill.
Public comments are welcome through December 26, 2021. To learn more about the project, or to comment, visit parkplanning.nps.gov/GoldHill.
Death Valley National Park is the homeland of the Timbisha Shoshone and preserves natural resources, cultural resources, exceptional wilderness, scenery, and learning experiences within the nation’s largest conserved desert landscape and some of the most extreme climate and topographic conditions on the planet. About two-thirds of the park was originally designated as Death Valley National Monument in 1933. Today the park is enjoyed by about 1,700,000 people per year. The park is 3,400,000 acres – nearly as large as the state of Connecticut. Learn more at www.nps.gov/deva.