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- The Black Diamond Mines Regional Preserve is a 6,000-acre (2,400 ha) park located north of Mount Diablo in Contra Costa County, California under the administration of the East Bay Regional Park District (EBRPD). The district acquired the property in 1973. The preserve contains relics of 3 mining towns, former coal and sand mines, and offers guided tours of a former sand mine. The 60 miles (97 km) of trails in the Preserve cross rolling foothill terrain covered with grassland, California oak woodland, California mixed evergreen forest, and chaparral. (en)
- El Black Diamond Mines Regional Preserve es un área localizada en el Condado de Contra Costa, California bajo la administración del East Bay Regional Parks District. La reserva incluye los restos de varias minas de carbón y los lugares de cinco ciudades alrededor de las minas. Las ciudades eran , Somersville, Stewartville, West Hartley y Judsonville. El carbón extraído de estas minas era de un bajo grado de calidad, pero en su época en el siglo XIX, era la única fuente de suministro accesible y económica en California. (es)
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- The Black Diamond Mines Regional Preserve is a 6,000-acre (2,400 ha) park located north of Mount Diablo in Contra Costa County, California under the administration of the East Bay Regional Park District (EBRPD). The district acquired the property in 1973. The preserve contains relics of 3 mining towns, former coal and sand mines, and offers guided tours of a former sand mine. The 60 miles (97 km) of trails in the Preserve cross rolling foothill terrain covered with grassland, California oak woodland, California mixed evergreen forest, and chaparral. (en)
- El Black Diamond Mines Regional Preserve es un área localizada en el Condado de Contra Costa, California bajo la administración del East Bay Regional Parks District. La reserva incluye los restos de varias minas de carbón y los lugares de cinco ciudades alrededor de las minas. Las ciudades eran , Somersville, Stewartville, West Hartley y Judsonville. El carbón extraído de estas minas era de un bajo grado de calidad, pero en su época en el siglo XIX, era la única fuente de suministro accesible y económica en California. (es)
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- Black Diamond Mines Regional Preserve (en)
- Reserva Regional Minas Diamante Negro (es)
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