Bulletin . 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
Bulletin . 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 ,
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