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San Juan Ridge
The San Juan Ridge () is a geographic feature
extending approximately east-northeast between the South and Middle Yuba Rivers in the foothills of the northern Sierra Nevada. The elevation is approximately 790 m (2,600 ft) above sea level.
==History==
"The Ridge" was notable for hydraulic mining during the California gold rush, the largest operation of its kind being run by North Bloomfield Mining and Gravel Company. French Corral was the first mining camp on The Ridge. In the 1990s, research was conducted to renew gold mining efforts.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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