Jackson-Plymouth Mining District, Amador County, California, USAi

Regional Level Types
Jackson-Plymouth Mining District	Mining District
Amador County	County
California	State
USA	Country

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Location
A 20-mile-long belt of gold mineralization runs through western Amador County. On the belt, a portion of the Mother Lode, are the towns of Jackson, Sutter Creek, Amador City, Drytown, and Plymouth.

History
This entire belt was settled early in the gold rush when the streams were placer-mined. Jackson was settled by California Spanish at least as early as 1849. It was first known as Botilleas, but the name was soon changed in honor of Colonel Alden Jackson. Sutter Creek was named for Captain John A. Sutter who visited the region in 1846. Amador City was settled in 1851 and Plymouth in 1852. Drytown flourished from 1848 until 1857 when rich placer deposits were worked. Most of the important lode deposits were discovered during the 1850s. The Argonaut mine was first developed in 1850, the South Spring Hill and Lincoln in 1851, the Plymouth in 1852, the Original Amador and Keystone in 1853, the Central Eureka in 1855 and the Kennedy in 1856. Lode mining in the district developed into a major industry that was to last 90 years.

Geology
The gold deposits are in a north- and northwest-trending mile-wide belt of gray to black slate of the Mariposa Formation (Upper Jurassic), with some interbedded coarse and occasionally sheared conglomerate and minor sandy and gritty layers (fig. 12). Massive greenstone of the Logtown Ridge Formation (Upper Jurassic) lies west of the belt of Mariposa Formation slate. Metasedimenrary rocks, chiefly graphitic schist, metachert and amphibolite schist of the Calaveras Formation (Carboniferous to Permian) are to the east. Several deposits of Tertiary auriferous channel gravels are exposed south of Jackson.

Mines: Alma; Alpine; Amador Gold ($100,000+); Amador King ($100,000+); Amador Queen No. 1 ($100,000+); Amador Queen No. 2 ($100,000+); Amador Star ($100,000+); Anita; Argonaut ($25.2 million); Ballard; Bay State ($100,000+); Bellwether; Bunker Hill ($5.1 million); Central Eureka group ($36 million); Crown Point; Detert group; Fremont-Gover ($5 million); Good Hope; Italian ($140,000+); Hardenbergh ($100,000+); Kennedy ($34.28 million); Keystone ($24 million); Lincoln ($2.2 million); Mammoth; Mayflower; Mineral Point; Moore ($564,000+); New London; North Star et al.; Oneida $(2.5 million+); Original Amador ($3.5 million); Plymouth Consolidated ($13.5 million); Potosi; South Eureka ($5.3 million); South Jackson; South Spring Hill ($1.1 million); Treasure ($1 million); Valpariso ($100,000+); Wildman-Mahoney ($5 million); and the Zeila (5 million+).

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

Mineral List

Mineral list contains entries from the region specified including sub-localities

24 valid minerals.

Rock Types Recorded

Rock list contains entries from the region specified including sub-localities