on the Wahsaich and Oquirrh Mountains. 199 
esi od) ies. Soups. tne wipes 40°90 
Metallic sulphides, ._._. iv ae OBO 
Al ‘35, Mg -25, Oa -72, Mn? Mn -20, 1°52 
95°02 
Water, carbonic acid and loss,.....-.._-.-- 4°95 
This calculation assumes that the sulphides are as follows, viz: 
Sralemite. oo. oe ee 38°69 
peibnite, See ee eee 3°30 
Poe, OO 103 
Sphalerite (blende), ..........-.------------ 3°62 
FPG os 5°42 
Argentite, _ . ._ 0°54==52°60 
This statement excludes the presence of any other gangue 
than silica, and considering that the ores exist in limestone, the 
almost total absence of lime in the composition of the average 
mass is certainly remarkable. The amount of silica found is 
noticeable, since quartz is not seen as such in this great ore 
chamber, nor so far as I could find, in other parts of the mine. 
The silica can haye existed in chemical combination only in the 
most inconsiderable quantity, since the bases with which it could 
! search among the contents of the mine The miners 
of the “ chlorides,” and unscientific observers have repeated the 
Statement that silver chloride is found in the Emma Mine, but 
eat i a) territories 
mining population of the centr r 
of the United State tinction between horn silver and of silver. Ped 
*rror arising, as I am persuaded, from supposing the ochreous ores to be chlorides 
Rot 80 perfectly developed as to be sectile. 
