Bulletin . trike)proved, on exploitation, to be a finer-grained material, carrying cin-nabar in much smaller percentage than the old ore. It was erroneouslynamed a shale mudrock. In 1912, the present owner took control ofthe property, rebuilt the furnace, and made a small jiroduction thatyear, besides developing a very large orebody of this low grade 142 CALIFORNIA STATE illXIXG BUREAU. material. In 1916. Edward A. Clark, et of New York, took a bondon the property, built a 300-ton concentrating mill,^ a new aerial tram-Avay of greater capacity than the old one, and a second 50-ton Scottfu
Bulletin . trike)proved, on exploitation, to be a finer-grained material, carrying cin-nabar in much smaller percentage than the old ore. It was erroneouslynamed a shale mudrock. In 1912, the present owner took control ofthe property, rebuilt the furnace, and made a small jiroduction thatyear, besides developing a very large orebody of this low grade 142 CALIFORNIA STATE illXIXG BUREAU. material. In 1916. Edward A. Clark, et of New York, took a bondon the property, built a 300-ton concentrating mill,^ a new aerial tram-Avay of greater capacity than the old one, and a second 50-ton Scottfurnace. They gave up their bond early in 1917, and the propertywith improvements reverted to Innes. The total recorded output ofthe Oceanic mine to the end of 1917 has been 23,251 flasks of quick-silver. Mine. The ore is a dark-gray, fine-grained sandstone, which containsenough calcite to cause marked .slaking on exposure. Petroleum is alsoassociated. There is considerable pyrite, and the cinnabar values are. Photo No. 30. Micro-photograph of diorite-gabbro at theOceanic Mine. / 60 diam. magnification. Photo byS. A. Tibbetts. SO finely disseminated as to be largely invisible underground. Init ifspecimens are taken from any part of the ore bloek. rcdiieetl on a buck-board and panned, a surprising prospect is obtained. There are alsooccasional crystalline accumulations of cinnabar on fracture ore is quite uniform in value. The ore stiikes XW-8E. (seePlate XVII), and the dip is nearly vertical though in places it reversesitself, being mainly NE. (see Photo. No. 29). It is from 15 to 60wide, being 40 wide at the top of the hill. The hanuing-wall is ser-pentine and the footwall, shale. On the southwest siile. and more orless parallel to the orebody. is a body of igneous rock of the diorite-gabbro series (see Photo No. 30). The sample from whieh the thin- See description, p , posi.
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