Spruce Pine Mining District
Coordinates: The Spruce Pine Mining District is a swath of the valley of the North Toe River in the Blue Ridge Mountains of northwestern North Carolina that is home to one of the richest deposits of gems and minerals in the world. Mined for its mica, kaolin, quartz and feldspar, the district provides much of the raw materials used in plumbing fixtures. Spruce Pine district is one of the largest suppliers of high-purity quartz, which is used in the manufacture of silicon chips.
The district is named after the town of Spruce Pine, which is located in the middle of the region and is the hub of major mining activity there. The district is approximately 25 miles (40 km) long and 5 miles (8.0 km) wide.
The pegmatites intruded into the Ashe Formation. The pegmatites and country rock are part of the Spruce Pine thrust block, the highest thrust sheet of the Blue Ridge belt, the latter being part of the Tugaloo Terrane which was accreted to North America during the Taconic Orogeny.
- Nelson, Sue (2 August 2009). "Silicon Valley's secret recipe". BBC News - Radio 4. BBC. Retrieved 2009-08-03.
- Swanson, S.E.; Veal, W.B. (2010). "Mineralogy and petrogenesis of pegmatites in the Spruce Pine District, North Carolina, USA" (PDF). Journal of Geosciences: 27–42. doi:10.3190/jgeosci.062.
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