This district is in northeastern Yuba County in the vicinity of the town of Dobbins. The town was named for the Dobbins' brothers who settled herein 1849. It also has been known as the Indiana Ranch district.
The principal rock type here is grandodiorite, with smaller amounts of quartz diorite and diorite intrusive into greenstone and slate. A number of north- and west-trending narrow quartz veins are found in granodiorite or along granodiorite-greenstone contacts. The ore contains free gold and varying amounts of sulfides and occasionally tellurides and scheelite.
California Mother Lode, Good Title, Higgins, Liberty, Lillian Francis, Red Cross, Red Ravine $100,000, Summit Hill, Templar.
Lindgren, Waldemar, 1895, Smartsville folio, California: U. S. Geol. Survey Geol. Atlas of the U. S., folio ,18, 6 pp.
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