GEOLOGY OF WEST COAST REGION OF UNITED STATES 



Metallic products of Tertiary age also are of 

 impressive value. The great belt of mercury de- 

 posits of the Coast Ranges of middle California were 

 formed along a zone of fracturing which was 

 probably initiated at the close of the extensive 

 basaltic eruptions of middle Miocene times. Anti- 

 mony is found in connection with some of the 

 mercury deposits. Valuable deposits of gold and 

 silver are found at certain favorable localities in 

 the Tertiary volcanic rocks of the three Pacific 

 Coast states. These were deposited by heated 

 mineral-bearing currents formed subsequently to 

 the enclosing lavas. The more notable examples 

 occur at Bodie and Calico in southern California, 

 in the Bohemia district, Douglas County, Oregon, 

 and in the Republic district, Ferry County, the 

 Monte Cristo district, Snohomish County, and the 

 Pierre Lake district, Stevens County, in Washington. 



Mineral springs, of value for medicinal and less 

 often for potable properties, are distributed along 

 the major structural lines of the west coast. 



Finally, we may mention the underground water 

 resources of the west coast. The amount, direction 

 of flow, and availability of many of the underground 

 currents have been studied by numerous geologists. 

 It is to be hoped that the men engaged in the de- 

 velopment of the agricultural resources of the vast 

 Pacific Coast empire may become more familiar 

 with the data already available. 



How to Peach the Important Mines of California. 

 Mr. H. M. Wolflin, mining engineer for the Indus- 

 trial Accident Commission of the State of California, 

 has recently visited most of the mines of the State. 

 At my request he kindly furnished the following 

 information as to how the most interesting mines 

 may be reached. 



I. Copper and Iron Mines of the Northern Part of 

 the State: 



These can be reached from Redding on the main line of the 

 Southern Pacific Railway from San Francisco to Portland. 



1. The largest mine at present in operation is the Mam- 



moth. The smelter and main office of the company 

 are located at Kennett and can be reached by rail 

 from Redding. 



2. Other important mines in this district are: Balaklala 



near Coram, which can be reached by rail from 

 Redding. 



3. Mountain Copper Company at Keswick. 



4. Heroult Iron Mines, situated near the town of Heroult, 



which is reached by Sacramento Valley Railroad, 

 which connects with the Southern Pacific at the 

 town of Pit. 



5. Bully Hill Mine, reached by Sacramento Valley and 



Eastern Railroad from Pit. 



58 



