GAGE — IRON ORES IN MISSOURI. 



:8 7 



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

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

 Wirth : 



Otto 



Peroxide iron, - 

 Magnetic oxide of iron, 

 Manganese, 

 Alumina, 

 Lime, - 



Magnesia, 

 Phosphoric acid, 

 Silicic acid, - 



Metallic iron, 

 Phosphorus, 



Specific gravity. 



Iron Mountain Ore. 



67.416 

 0.016 



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, 

 1 1 12 above the directrix in St. Louis, and 1^21 above tide. 



