USEFUL J//.T1/.S 



288 



shaped masses that somewhat rcs.-ml.li- h. .l.lc.l depoHite. Aninulc 

 lump of ore weighing ()V cr :{<MM) Ik has been obtained. The cost 

 of labor and rail way transportation i> si. ;, p.-r ton. Thepriceof 

 the ore as determined t.v the Illinois Steel Company of South 



enevion Jt 

 >ula flag 



Grits 



ingula flags. 

 Manganese btdi Indicated ty thick black lint 



FIG. 127. Map showing the manganese bearing horizons in the Cambrian 

 rocks of Merionethshire, North Wales. (After J. G. Goodchild.) 



Chicago, and the Carnegie Steel Company of Bessemer, Pennsyl- 

 vania, ranges from $9 to $10 per ton. Therefore the approximate 

 profit is $5 per ton. Fifteen cents per ton is deducted for each 

 per cent, of silica exceeding 8 per cent. The Brazilian ore con- 

 tains 1.05 per cent, of silica. Two cents per unit is deducted for 



