The quicksilver resources of California . a w^orkable ore same is found on the Bacon Consolidated and CinnabarKing ground (Pine Mountain), and also in the Double Starmine (Pine Flat). (Lawsons silica-carbonate sinter.) Pine Mountain is a mass of andesitic tufa, most probablywith an eruptive core, of small dimensions and very steepsides, and entirely disconnected from the Mount St. Helenaand the Mount Cobb groups of eruptives. Its main ridge isnot over 25 feet wdde, and about 300 feet long; elevation, 3475feet. The tufa is of a light grayish color, and has spread overa part of the a
The quicksilver resources of California . a w^orkable ore same is found on the Bacon Consolidated and CinnabarKing ground (Pine Mountain), and also in the Double Starmine (Pine Flat). (Lawsons silica-carbonate sinter.) Pine Mountain is a mass of andesitic tufa, most probablywith an eruptive core, of small dimensions and very steepsides, and entirely disconnected from the Mount St. Helenaand the Mount Cobb groups of eruptives. Its main ridge isnot over 25 feet wdde, and about 300 feet long; elevation, 3475feet. The tufa is of a light grayish color, and has spread overa part of the adjacent ravines. No signs of basaltic rock couldbe found on the ridge. The Helen mine is situated on theeastern slope, near the edge of the tufa, and on the south-western, western, and northwestern slopes are located a seriesof mines, comprising the Cinnabar King and Bacon group ofmines. The northwestern slope is very steep and partly cov-ered by tufa, which covers alternate beds of serpentine and 38 QUICKSILVER RESOURCES OF Fig. I. Section of uonhwest slope of PineMountain, Sonoma County. metamorphosed sandstones. At the contacts wide belts ofcroppings show, partly in place, partly covering the side hillwith large bowlders. These croppings resemble very muchthose of the Wall Street and Jewess. In the caiion continu-ing below the old road from Middletown to Pine Flat a verywell-defined cropping on the contact of serpentine and sand-stone is seen. [See Fig. i.] A great amount of work has been done here; remnantsof old shafts and tunnelsare found everywhere onthe hillsides, but all workis now abandoned. Sev-eral pockets of very richcinnabar ore were foundat diSerent points at thesurface, but none appearto have been found persist-ent in depth. The headwaters of Putah Creek are situated in a basin onthe south slope of Mount Cobb. In this basin are a greatnumber of hot springs, of which Anderson Springs are by farthe most prominent. These springs generally contain a gre
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
