Identifier: reportofstatemin17cali (find matches)
Title: Report of the State Mineralogist
Year: 1892 (1890s)
Authors: California State Mining Bureau
Subjects: Mines and mineral resources Gold mines and mining Mineralogy
Publisher: Sacramento : California State Mining Bureau
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
The folding of the Tertiaryrocks shows that compression was repeated in the same direction at the close of theMiocene. The position of the rhyolite dike proves that the dislocation which openeda passage for this lava again followed a similar course. Also :2 Ore deposition followed the eruption of lava. The minerals deposited and themanner of their deposition are such as in the more northerly quicksilver districtswere induced by volcanic springs. Though there are now no indubitable remnants ofthe volcanic activity which certainly prevailed here since the beginnng of the Pliocene,the analogies of the deposit, together with the presence of lava of approximately thesame age as the ore, make any theory of deposition excepting from hot sulphursprings improbable. There have been but two mines of consequence developed in this dis-trict, the New Almaden and Guadalupe, though there are a number ofsmall properties which have at times produced a few flasks of qirick- ^Idem, p. 314.2Idem, p. 32 8.
Text Appearing After Image:
Plate II. Map of New Almaden Mining Distr SC/EAICESUBRAfry Table of Mineral Production of Santa Clara County—1850 to 1918, Inclusive. Quicksilver Mineral water Petroleum Brick Clay Sandstone Limestone Stoneindustry Magneslte Miscellaneous and unapportioned Year Flasks 7,723 2r,779 15,90122,28430,00429,14227,13828,20425,7611,2947,06134,42939,67132,80342,48947,19435,15024,46125,62810,89814,42318,56818,57411,0429,08420,00016,98027,93030,23724,92436,05430,13531,28329,20829.08420,03021,40018,00920,00018,01013,10012,0098,200 ;.,503 6,6147,2357,0506,2224,7005,8754,4355,1455,220 5,6033,889 2^5922,5182,4603.7474,0387,5338,6953,7092,4074,3864,0165,9213,9773,012 Value Gallons Value Barrels ; Value M Value Tons Value Cubic feet Value Tons Value Tons Value Vaiue 1850 $76S,052 1852 927,5051,235,6181,663,7221,560,5541,401,6781,374,381 ::::::::::: ::::::::::: ::::::::::: :::::::::::: :::::::::::: 1853 1854 1855 1850 1859 I860 1861 1862 81,690 378,1171,447,7391,442,0411,389,3501,950,2452,166,2051,86

Note About Images