Bulletin . on the ridge between Big Sulphur andSquaw creeks, at their junction, the mine workings and reduction plantbeing on the slope toward the f(nmer. The topography is very steep(see Photo No. 37), the elevation lieing 1000 at the furnace and 2200(bar.) at the top of the ridge. The orebody is characterized by ledges of thinly stratified chert,enclosed by sandstone. These ledges have generally a northwest strikeand northeast dip. The chert strata vary from V to 3 in thickness. 184 CALIFORNIA STATE MINING BUREAU. The cinnabar forms as face metal and incrustations in the fissuresof the more
Bulletin . on the ridge between Big Sulphur andSquaw creeks, at their junction, the mine workings and reduction plantbeing on the slope toward the f(nmer. The topography is very steep(see Photo No. 37), the elevation lieing 1000 at the furnace and 2200(bar.) at the top of the ridge. The orebody is characterized by ledges of thinly stratified chert,enclosed by sandstone. These ledges have generally a northwest strikeand northeast dip. The chert strata vary from V to 3 in thickness. 184 CALIFORNIA STATE MINING BUREAU. The cinnabar forms as face metal and incrustations in the fissuresof the more compact chert beds, and as richer seams and bunches in thecrushed portions. The chert is highly siliceous. The deposit has beenopened up at several levels by both open-cuts and adits. It is statedthat at present sufficient ore is blocked out to operate the 20-ton furnacefor several years. As a whole the underground workings are not veryextensive, the major portion of the output having come from the open- I. Photo. No. 37. Cloverdale Mine, Sonoma County, showing gravity tram tofurnace ore-bins. Photo by Emile Huguenin. cuts. With topography decidedly in their favor, the ore is handled asurprisingly unnecessary number of times between the mine and thefurnace. The latter is a modified Livermore furnace, of 20 tons capacity,which is essentially a tile furnace with inclined reverberatory hearth.^The products of fuel combustion pass directly over the ore layer. See pp. 226, 230, post: also Photo No. 41 QUICKSILVER RESOURCES. 185 Crude oil is now used for fuel instead of wood, as formerly, the oilbeing fed by 4 Ray electric burners. (See Photo No. 48, post.) Thecondensers are in part Knox & Osborne iron chambers, to which wereadded in 1917, three redwood, rectangular boxes, approximately5x8xl5, each having 3 compartments. An experimental concentra-tion plant set up on the Squaw Creek side was in operation for a shorttime early in 1916. Some success is said to have attended their exper
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