ELISHA MITCHELL SCIENTIFIC SOCIETY. 59 



supply of ore will be obtained from the mines of the com- 

 pany at Ore Hill, Chatham connty, about forty miles dis- 

 tant. This ore is a brown hematite of very fair quality, 

 as shown b\- the following analyses, made in the laboratory 

 of the North Carolina Geological Survey: 



Phosphorus 0.069 0.139 0.106 0.038 



These deposits have been partially developed during the 

 past year and about 700 tons of ore taken out. Besides 

 this source magnetic ores from the western part of the 

 State will be used. Limestone will be obtained from Vir- 

 ginia and coke from the Flat Top region in the same 

 State. 



In Granville county some recently discovered deposits of 

 magnetic iron ore of good quality have been prospected 

 with encouraging results, but no regular mining opera- 

 tions have yet been started, and no ore has been shipped. 



COPPER ORE. 



The Blue Wing Mine in Granville county was the only 

 producing mine in the State during 1892. Up to October, 

 when the mine and concentrator closed down indefinitely, 

 the production of concentrates, shipped to the Orford 

 Copper Works, N. Y. , was valued at $15,000 (estimated). 



The ore is chiefly bornite in a quartz gangue. The fol- 

 lowing analyses show the quality of the ore and concen- 

 trates: 



Copper. Silver. 



Per Cent. Oz. Per Ton. 



Ruu of mine ore - -- 8.66 3.55 



Cobbed ore -- -- 14.21 5.66 



Jig concentrates 52.32 12.00 



Frue vanner concentrates - -^ 36.87 12.60 



