\J inerals, i\ocks aad r ossils. 



I -BLACK HILLS COLLECTION. 



(Jollected hy II. Montgomery, in ISSo, under tlie antliority of the 

 Board of Ilegents. 



1 — Gold Ore. Native gold in porphyry. This weighs 

 some 70 pounds and. shows several nuggets on "its 

 surface. 



Homestake mines, Lead City, Black Hills, Dakota. 



2 .3 — Gold Ore. Gold ore in porphyry. 



Homestake mines, Lead City. Black Hills, Dakota. 



4 — Gold Ore. Native gold in quartz rock. 



Homestake mines, Lead City, Black Hills, Dakota. 



5-7 — Silver Ore. Cerargyrite or horn silver. 



Carbonate Camp, Central City, Black Hiils, Dakota. 



S-l 1 — Tin Ore. Cassiterite in Albite rock. 



Etta mine, Harney Peak region, Black Hills, Dakotn. 



12-10 — Tin Ore. Cassiterite in Greisen rock, (piartzose rock, 

 etc. 



Harney Peak region, Black Hills, Dakota. 



20 21 — Tin Ore. Stream tin. Cassiterite. 



Stream in liear Gulch, west of S|)earfish, Black Hills. 



22 — Tin Ore. Cassiterite in <juartzose rock. 



Bear Gulch, near Speartish, Rawlinson's mining re- 

 gion, Black Hills, Dakota. 



