Bulletin . acres. TheAccident claim at the west end of the first-named group is under leaseto Frank Hooks, Oakville, who, in September. 1917. had 30 feet of tun-nel driven, with some cinnabar showing in a siliceous gangue. The LaJoya property had been idle many years, but was reopened in 1915. thepresent operators taking charge in July. l!)l(i. A total of 405 flasks QUICKSILVER RESOURCES. 85 of quicksilver have been produced to the end of 1917, not including theearlier day operations, as those figures were not segregated. The vein is in a much-altered serpentine, but there is a contact wi
Bulletin . acres. TheAccident claim at the west end of the first-named group is under leaseto Frank Hooks, Oakville, who, in September. 1917. had 30 feet of tun-nel driven, with some cinnabar showing in a siliceous gangue. The LaJoya property had been idle many years, but was reopened in 1915. thepresent operators taking charge in July. l!)l(i. A total of 405 flasks QUICKSILVER RESOURCES. 85 of quicksilver have been produced to the end of 1917, not including theearlier day operations, as those figures were not segregated. The vein is in a much-altered serpentine, but there is a contact withsandstone nearby. The strike is northwest and the dip southwestrather flat; average width 6, l)ut in the Big Stope it is up to 6 sets(36) wide. There is another, smaller vein ir the hanging wall. Thecinnabar is mostly crystalline, with a little pyrite, and the gangue islargely siliceous, both chalcedony and quartz being present. Chlorite,characteristic as an end product of the weathering of serpentine, is. Photo No. 15. Furnaces at La Joya Mine, Napa County. Fitzgerald furnaceleft; Livingston at right; and retorts on bench between. ildines at abundant. A little native mercury has been noted. The main aditwas driven 820 to crosscut the vein, which has been drifted on for alength of 400 feet. (See sketch map, Plate XI.) This is at a depth of250-300 below the outcrop. Ore is being broken by raises and Fitzgerald furnace was built some years ago. This was suppos-edly an inclined retort/ but it appeared to the writer to have been oper-ated like a Livermore furnace, with the flames passing along the top ofthe ore instead of outside the ore-chamber as designed. This furnacein March-May, 1917, was treating 6 tons per day with a yield of 1 flaskof quicksilver daily. It is stated that at first there was condensation ofquicksilver in the upper part of the ore chamber, following which a -See p. 216, post: also Forstner, op. cit., pp. 204, 305. 86 CALIFORNIA STATE MINING BUREAU.
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