In 2006, South Dakota began turning a mine that produced 41 million ounces of gold into America’s deepest underground lab; today scientists work 4,850 feet down searching for dark matter and neutrinos - The Times of IndiaIn 2006, South Dakota began turning a mine that produced 41 million ounces of gold into America’s deepest underground lab; today scientists work 4,850 feet down searching for dark matter and neutrinos The Times of India