520 Revieivs — Geological Survey of Canada. 



III. — Geological Survey of Canada, 1897. Geological Map of 

 part of the Trail Creek, Mining Division, West Kootenay 

 District, British Columbia. Scale, one mile to one inch. Geo- 

 logically surveyed by R. G. McConnell. Preliminary edition. 



THE Map, with contours, was compiled and drawn by J. McEvoy, 

 from original surveys and plans of railways and the Depart- 

 ment of Lands and Works, British Columbia. The series of 

 rock-formations indicated on the map are: — (1) Conglomerate 

 (Tertiary?). (2) Palaeozoic volcanic rocks, effusive and fragmental. 

 (3) Altered basic igneous rocks (serpentine, etc.). (4) Gabbro. 

 (5) Schists and granite-gneisses (Shuswap series?). (6) Younger 

 granite. (7) Older granite. 



Each of these rock-groups has a marginal note descriptive of 

 characteristics, area, etc. Notes " 8 " and " 9 " refer more par- 

 ticularly to the auriferous rocks, thus : — 



Note 8. "The sulphide ores of the district are associated 

 principally with the basic igneous rocks, and especially with the 

 central gabbro area, around which the principal mines, so far 

 worked, are grouped. Tde veins have an approximately east-and- 

 west strike, and, with few exceptions, dip to the north at high 

 angles. They follow lines of fissuring; and, so far as present 

 evidence goes, belong to the class known as ' replacement veins.' 

 The lodes are somewhat irregular, and vary in size from small 

 stringers and disseminated grains to great ore-bodies, forty feet 

 or more in width. The principal ores are pyrrhotite and chalco- 

 pyrite, often associated with pyrite and mispickel and occasionally 

 with molybdenite. Cobaltiferous mispickel, or danaite, occurs at 

 the 'Evening Star,' and gersdorifite, a sulph-arsenide of nickel, 

 at the same mine, and at the ' Columbia-Kootenay.' Besides the 

 above minerals, galena and blende occur in some of the mines 

 situated near the outskirts of the main mineral area. The ores 

 are often more or less siliceous, and calcspar is occasionally met 

 with in seams and pockets ; but, as a rule, the principal gangue 

 is the ordinary country-rock of the district, usually only slightly 

 altered. The gold contents of the ores are exceedingly variable, 

 ranging from traces up to several ounces per ton. The smelter- 

 returns of 1,200 tons of ' Le Roi ' first-class ore are given by 

 Mr. Carlyle as 2-6 oz. of gold, 1-8 oz. of silver, and 2-o per cent, 

 of copper; and of 4,800 tons second-class ore as 1-34 oz. of gold, 

 l'4oz. of silver, and 1-6 per cent, copper." 



Note 9. "Eissure veins filled with a quartz gangue are occa- 

 sionally met with in this district. The best known of these is the 

 ' O.K.' mine, situated west of Sheep Creek, but a number of 

 locations have also been made on Murphy Creek, Grouse Mountain, 

 and other places. The veins vary in size from a few inches to 

 six feet or more, and carry free gold and auriferous sulphides of 

 iron, copper, and lead." 



The index to tlie numbers of the mining claims comprises 240, 

 457, 459, 531, and on to 1,692, with some exceptions. 



