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The Sanford Underground Research Facility (SURF), or Sanford Lab, is an underground laboratory in Lead, South Dakota. The deepest underground laboratory in the United States, it houses multiple experiments in areas such as dark matter and neutrino physics research, biology, geology and engineering.
By 1910, Lead had a population of 8,382, making it the second largest town in South Dakota. [10] Lead was founded as a company town by the Homestake Mining Company, which ran the nearby Homestake Mine. Phoebe Hearst, wife of George Hearst, one of the principals, was instrumental in making Lead more livable. She established the Hearst Free ...
The Homestake Mine was a deep underground gold mine (8,000 feet or 2,438 m) located in Lead, South Dakota. Until it closed in 2002 it was the largest and deepest gold mine in the Western Hemisphere . The mine produced more than forty million troy ounces (43,900,000 oz; 1,240,000 kg) of gold during its lifetime. [1]
Redesignated as South Dakota Highway 8: SD 19: 86.974: 139.971 N-15 at the Nebraska state line south of Vermillion: SD 34 southeast of Madison: 1926: current Designated as part of US 12: SD 19A: 8.161: 13.134 SD 19/SD 46 south of Centerville: SD 19 west of Centerville: 1950: current Originally part of SD 19: SD 20: 385.079: 619.725
I-29 / US 81 at the North Dakota state line north-northwest of Victor: 1958: current I-90: 412.76: 664.27 I-90 at the Wyoming state line west-northwest of North Spearfish: I-90 at the Minnesota state line north-northeast of Valley Springs — — I-190: 1.72: 2.77 US 16 / SD 44 / West Boulevard in Rapid City: I-90 / US 14 / US 16 / SD 79 in ...
Leaving Sturgis, SD 79 leads to Bear Butte State Park and briefly runs concurrently with U.S. Route 212 south of Newell. Near North Dakota, the highway passes through the South Dakota portion of Custer National Forest. SD 79 then joins SD 20 for a short concurrent run, and finally turns northward until it reaches North Dakota.
South Dakota Highway 44 (SD 44) is a state highway in southern South Dakota that runs from U.S. Route 385 (US 385) west of Rapid City to Interstate 29 (I-29) south of Sioux Falls. It is just more than 379 miles (610 km) long.
South Dakota Highway 264 (SD 264) was a state highway located on a former alignment of US 16 in eastern Minnehaha County. It was created c. 1976, when the South Dakota Department of Transportation and the Minnesota Department of Transportation moved US 16 from surface streets to I-90 in the area. [4] [5] The route was decommissioned in 1999. [6]