The quicksilver resources of California . acicular crystalsare found in the vugs. Some metacinnabarite is found, gen-erally as coating of iron pyrite aggregates. The mine isequipped with a 6o-ton Hlittner & Scott furnace. Corona Mine.—Mayacmas District. In Sees. 32 and 33,T. 10 N., R. 6 W. [See Report State Mining Bureau of Cal.,XIII, page 597.] The Vallejo Quicksilver Mining Company,owner; J. B. McCauley, president and superintendent, Oathill,Napa County. The mine is at the head of James Creek, on thecontact of a serpentine belt and the Oathill sandstone for-mation. [See Fig, 25.] The ore occ
The quicksilver resources of California . acicular crystalsare found in the vugs. Some metacinnabarite is found, gen-erally as coating of iron pyrite aggregates. The mine isequipped with a 6o-ton Hlittner & Scott furnace. Corona Mine.—Mayacmas District. In Sees. 32 and 33,T. 10 N., R. 6 W. [See Report State Mining Bureau of Cal.,XIII, page 597.] The Vallejo Quicksilver Mining Company,owner; J. B. McCauley, president and superintendent, Oathill,Napa County. The mine is at the head of James Creek, on thecontact of a serpentine belt and the Oathill sandstone for-mation. [See Fig, 25.] The ore occurs in a zone of blackchert rock, Ijing between a sandstone foot wall and probably c/f f ot^r/^/y ?ifaC S en-/:>f>-j^ Z^---e -—^ -. ^ in^ /StT JtV/ S ^ Fig. 26. Corona Mine—Section showing formation. Dip, 30*. a serpentine hanging wall. [See below.] The general strikeof the zone is N. 45° W. Three ore shoots show at the sur-face. The development consists mainly in a level which entersthe hill running very nearly west and crosscutting the sand-stone foot wall for about 400 feet. The sandstone is heremixed with some shales. At 400 feet, the tunnel cuts the veinand follows it about 800 feet to the southeast, and 1300 feet tothe northwest. The tunnel cuts the vein at the southeasterlyore shoot, with about 130 feet of backs. The workable orebody is here from 10 to 15 feet wide, the cinnabar forming infissures running through the opaline rock. Underlying thelatter is a white talc, wherein pieces of white and gray rockare found, determined as phthanite, indicating that originallya body of shales overlaid the sandstone and were silicified, 80 QUICKSILVER RESOURCES OF CALIFORNIA. probably by the same solution which
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