APPENDIX. 



A. — Minerals of the District. 

 B. — Catalogue of Bocks. 



A. 



MINERALS OF THE DISTRICT. 



The mineral of most importance in an economic point of view in our 

 district is coal, which occurs at three or four localities. Salt is the next 

 in importance, beds of this mineral occurring in the Salt River Region, 

 which is also full of salt springs. As far as known, there are no mining 

 localities in the district, which, as the report shows, is an area of sedi- 

 mentary rocks, in which it is not probable that gold and silver deposits 

 will be extensively found. The Bear River Range and the Malade 

 Range, it is true, are said to have yielded silver-bearing ores, but it is 

 probable that the areas are bruited and will never become successful 

 mining districts. It must be said, however, that comparatively little 

 prospecting for ores has yet been carried on. 



LIST OF MINERALS OF THE GREEN RIVER DISTRICT. 



The list of minerals presented is meagre for the reason that time was 

 too short to explore the natural cuts for specimens, and there were no 

 mining districts within the areas explored by us. 



Calcareous tufa. — Calcareous tufa was found at all the spring local- 

 ities, of which the following is a list : 



Soda Springs. — The specimens at this locality are particularly fine, 

 especially those from the Formation Spring. 

 Twin Springs, at base of Soda Springs Hills 

 Canon of Bear River, in Basalt Yalley. 

 Gentile Valley, on Bear River. 

 Portneuf Canon. 

 Calcite. — In the Hmestones of the Wyoming, and Salt River Ranges. 



In Preuss Range and Bear River Range. 

 Coal. — Bituminous coal {lignitic), at Twin Creek Mines ; Smith's Fork ; 

 Bell's Pass, between Ham's Fork and Twin Creek. 



Lignite, on Bear River, above Soda Springs ; in Gentile Yalley ; 

 on Smith's Fork of Bear River, near the forks of the river. 

 Feldspar. — Orthoclase in the granites of the Wind River foothills. 



Obsidian in the basalts of the Blackfoot Basin. 

 Halite (common salt), in springs in Salt River Yalley and on Smoking 

 Creek. At the latter idace there is only one spring that is being 

 used at the salt-works. Two hundred thousand pounds of salt is 

 the monthly yield. 



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