GAGE IRON ORES IN MISSOURI. 



187 



Insoluble silicious matter, 

 Peroxide of iron, 

 Protoxide of iron, - 

 Alumina, - - - 

 Lime, - . . - 

 Magnesia, - - - 

 Manganese, - . - 

 Sulphur, - - - 

 Phosphoric acid, 



Metallic iron, 

 Phosphorus, 



Cedar 

 Hill. 



5.62 

 93-54 



00.00 

 0.90 



65-47 

 0.039 



BUFORD 



Mt. 



8.54 

 68.30 



metallic 

 12.3 



O.OII 



0.102 



47.8 

 0.044 



All of these analyses were made by Mr. Andrew J. Blair. 

 The following, of Iron Mountain ore, was made by Mr. Otto 

 Wirth: 



Peroxide iron, - 



Magnetic oxide of iron, 



Manganese, 



Alumina, 



Lime, ... 



Magnesia, 



Phosphoric acid. 



Silicic acid, - 



Metallic iron. 

 Phosphorus, 



Specific gravity, 



Iron Mountain Ore. 



4-944 



5.002 



There is a number of porphyry mountains in this district, some 

 isolated like Shepherd Mountain, and some connected by saddles 

 as Pilot Knob. These mountains vary in height from two or three 

 to over six hundred feet, Pilot Knob being 562 above the valley, 

 II 12 above the directrix in St. Louis, and 1521 above tide. 



