 | Geological Survey (U.S.) - 1902 - 238 Seiten
...or 4 miles apart, and are remarkable for the great depth they attain in the short distance of 6 to S miles from their point of origin. SOIL. The eastern...the main river. The placer deposits that extend east into the Fall Creek Mountains are of small consequence and are mined by hand. Quartz mining is carried... | |
 | 1902 - 376 Seiten
...to a junction with Middle Fork of Yuba have been torn up in all directions by the hydraulicgiants. Vast masses of debris have resulted. Some of this...acquiring a permanent slope, while the smaller streams arc choked with finer debris gradually sliding into the main river. The placer deposits that extend... | |
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The western portion of the basin is noted for its rich and extensive placer deposits, which have been worked since the early days of gold discoveries in California. Since the introduction of hydraulic methods the auriferous gravel beds west of a line... 