GEOLOGY. 59 
of the town is from 920 to 930 fine. The Georgetown gold is 
coarse, and from 890 to 920 fine. At Kelsey’s Diggings the 
fineness is 860. At Placerville the range is from 870 to 970. 
Coon Hollow, near Placerville, produces gold 970 fine. At 
Diamond Springs the fineness varies from 870 to 900. The 
El Dorado or Mud Springs gold is 860 fine. The gold of the 
Cosumnes River varies from 865 to 875. 
The gold along the American River, in Sacramento county, 
is from 915 to 920 fine. 
Most of the gold in .\ador county is poor, from 865 to 
920. The gold about Vo.cano averages 870; Jackson, 865 to 
868; the Buttes, near Jackson, 920. 
The gold of the Mokelumne River, above Mokelumne Hill, 
varies from 850 to 910. At the hill, some of the gold has been 
980 fine. At Campo Seco the fineness is 900. Along the Mo- 
kelumne River are many placers where the gold is in coarse, 
wiry pieces, and poor in quality. At Vallecito, the fineness is 
915; at San Andres, 920; at Murphy’s, 885; at Douglas Flat, 
890; at Angel’s, 890; at Jesus Maria, from 858 to 860; and 
at Carson, from 890 to 920. 
The gold found along the Stanislaus River is from 875 to 
880 fine. 
Columbia, in Tuolumne county, is the best place for good 
gold in the state; it ranges from 930 to 970. There are many 
other places where gold equally fine is obtained, but none 
which produces so much gold of a high fineness, with so small 
a proportion of poor gold. The average of the Sonora gold is 
900; Jamestown, 870; Montezuma Flat, 900; ravines at Chi- 
nese Camp, 950; the river and creek claims at Chinese Camp, 
860; Don Pedro’s Bar, 880; Big-Oak Flat, 800; and Garote, 
810. . 
La Grange, in Stanislaus county, has gold 885 fine; that of 
the Merced River is from 845 to 860 fine. 
The gold of Mariposa county is poor, and much of it wiry, 
ranging from 700 to 820 fine, averaging about 760. Some of 
the gold of Mariposa county is coarse, and resembles that of 
