Bulletin . Mon. XIII, pp. 310-330, 467, 1888. ^Forstner, Wm., Quicksilver resources of California: Cal. State Min. Bur., Bull. 27,pp. 168-171, 1903. 155 IIIVX 3TAjq i:a-(,oA-!arly closely =f~ively worked -•^.,, for a con- . ilver miners, ? Bore or less products of nife blade to ound a body c-gray sand- ta (Spanish ay material, 1, yellowisli- :es the same tt below the ;an series in . ever, almost ^; is exposed,^ds of of thele , southA body ofirly east and .>y«*A bstance ofss, readilyock. It isti composi-Its black U- *^^^tsvV ^»<\\X<V^ft2/ maden
Bulletin . Mon. XIII, pp. 310-330, 467, 1888. ^Forstner, Wm., Quicksilver resources of California: Cal. State Min. Bur., Bull. 27,pp. 168-171, 1903. 155 IIIVX 3TAjq i:a-(,oA-!arly closely =f~ively worked -•^.,, for a con- . ilver miners, ? Bore or less products of nife blade to ound a body c-gray sand- ta (Spanish ay material, 1, yellowisli- :es the same tt below the ;an series in . ever, almost ^; is exposed,^ds of of thele , southA body ofirly east and .>y«*A bstance ofss, readilyock. It isti composi-Its black U- *^^^tsvV ^»<\\X<V^ft2/ maden dis- VHre sharplylower seriesew Almaden oast Ranges,den and thece of several nnabar, withrcasite, withid The Guada- ssure system.;. It followshe dike for alita. it seemsstrike of itslikely to be which also I ?MMMMHIBHIHi PLATE QUICKSILVER RESOURCES. 155 that the fissures wherein tlie orebodies have formed have invariably a serpentinefootwall; hence the serpentine must be considered to occur underground in a con-tinuous body through tliis entire territory and to be in places covered by overlymgsandstones and shales. Southwest of Capitancillos Creek lies another parallelexposure of serpentine, contiguous to which the outcrops of the Costello mmesnre found. The Santa Teresa and Bernal mines are located in the serpentine of theSanta Teresa hills, and the North Almaden or Silver Creek mine close to those of themost northern ridge. In the latter a great part of the serpentine is very highlyaltered by silicification, as also the sandstones, a great portion of the rocks beingjaspilites. The western slope of the adjoining Mount Diablo range is nearly exclusivelyformed of shales. , , , , In this district the occurrence of cinnabar-carrying orebodies is clearly closeiyallied to that of serpentine, and as the New Alm
Size: 1510px × 1655px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeology, booksubjectm
