File:Annual report of the State Mineralogist for the year ending (1883) (14777814702).jpg

Identifier: annualreportofst10cali (find matches)
Title: Annual report of the State Mineralogist for the year ending ...
Year: 1883 (1880s)
Authors: California State Mining Bureau
Subjects: California State Mining Bureau Mines and mineral resources Gold mines and mining Geology Mineralogy
Publisher: Sacramento : California State Mining Bureau
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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n Ridge about a mile east of Georgetown, inEl Dorado County. Going north it crosses Bear River, and continues into Nevada County,passing west of Omega and Washington. This great belt of serpentine divides the central from the eastern goldbelt in Placer County. East of the serpentine is a continuous belt, nearly eighteen mileswide, known in Placer as the East Gold Belt. This is composed ofmetamorphic slates, mica, talc, chlorite, and hornblende schists,quartzite, dikes of diorite, and porphyry and diabase, and on theextreme east syenite, which joins the granite near Cisco, and east of theRalston Dam, on the Middle Fork of the Middle Fork of the AmericanRiver. The outcrops of numerous veins are seen on the ridges between BearRiver and the North Fork of the North Fork of the American River,on Texas Ridge, between the North and South Forks of the American,south of Humbug Canon, near Damascus, on the ridge between theNorth Fork of the American River and Humbug Canon, and at Canada Plate 4-
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rres ent R iver o o £ c/> —. z (/> (D o ja 30 -n m 2* *J m H 5 < £ Z m 03 O »■5 2 O o 2^ O Z H Jo H xin tn o J3 O 2 *2 38 71 > 5 «>? o > m Z » ? o V z. -< H 00 - * m rn < Z k m 55 o i PLiCEPit COUNTY. 417 Hill and Last Chance. Throughout the above described region severalgold-bearing veins,are being prospected and worked with very flatter-ing results. West of the serpentine also are numerous promising gold-bearingeins, which have been located, and are being prospected and worked,the most important of which is the Drummond Mine, on Sec. 1, T. 14N., R. 10 E., M. D. M. The only fossils found during my examinations were ammonites,found in a peculiar belt of slaty rock which is about two thousand feetwide and forms the foot wall of the Sterrett Quartz Mine on SailorCanon. On top of the ridges the rocks are usually decomposed for aconsiderable depth, and covered with soil, and in numerous places arethe beds of the ancient rivers of the Tertiary f

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