' APPENDIX. 



A. — Minerals of the District. 

 B. — Catalogue of Eocks. 



A. 



MmEEALS OF THE DISTEICT. 



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

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

 in importance, beds of this mineral occurring in the Salt Eiver Eegion, 

 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 Eiver Eange and the Malade 

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

 probable that the areas are limited and will never become successful 

 mining districts. It must be said, however, that comx3aratively 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 exi3lored by us. 



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

 ities, of which the following is a list : 



&oda Springs. — The specimens at this locality are x)articularly fine, 

 especially those from the Formation Spring. 

 Twin Springs, at base of Soda Springs Hills 

 Canon of Bear Eiver, in Basalt Valley. 

 Gentile Valley, on Bear Eiver. 

 Fortneuf Canon. 

 Calcite. — In the limestones of the Wyoming, and Salt Eiver Eanges. 



In Preuss Eange and Bear Eiver Eange. 

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

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



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

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

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



Obsidian in the basalts of the Blackfoot Basin. 

 Halite (common salt), in springs in Salt Eiver Valley and on Smokiug 

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

 used at the salt-works. Two hundred thousand i)ounds of salt is 

 the monthly yield. 



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