W. P. Blake—Columbite in the Black Hills. 341 
6, not less than 2000 pounds, or one ton. On blasting it out it 
without sulpburic or carbonic acid. A similar mineral occurs 
‘at the Etta but gives different reactions. 
The blow-pipe reactions of the columbite from the Ingersoll 
Claim are peculiar in the amount of manganese indicated. 
With borax, in O.F. the bead is dark amethystine red, and in 
R.F. a pale amber yellow. The purity of this reaction for man- 
ganese is not impaired by any other metallic reaction. With 
phosphate of soda and ammonia in O.F. the mineral dissolves to 
Sapphire-blue reaction. 
Pine Forest Camp, September 25, 1884. 
