IRON OKE, LIMESTONE, AND COAL. F 2 . 99 



Sesquioxide of iron, 50.285 61.143 62.000 



" " manganese, 051 .072 .072 



Alumina, 5.101 2.937 4.191 



Lime, 1 070 .650 .600 



Magnesia, 342 .288 .324 



Sulphuric acid, trace. .107 .135 



Phosphoric acid, 146 .176 .279 



Water and organic matter, 7.465 9.980 9.925 



Siliceous matter, 35.540 24.640 22.570 



100.000 99.993 100.096 



Metallic iron, 35.200 42.800 43.400 



Metallic manganese, 035 .050 .050 



Sulphur, trace. .043 .054 



Phosphorus, 064 .077 .122 



Phosphorus in 100 parts iron, 181 .179 .281 



3. The Hamilton (Jfonlebello) foss il ore. 



This ore, which ranks third in the county for value and 

 productiveness, lies on the top of the Hamilton sandstone ; 

 and its outcrop, more or less ferruginous, follows the out- 

 crop of that bed through the county. It is usually about 

 two feet thick. In the lower part where in contact with the 

 rock it is very sandy and fossil if ero us. In the upper part 

 it is a fairly good hematite. Both parts are usually taken 

 out together. 



Most of the ore taken from this bed has been used at 

 Duncannon furnace for mixture with better ores. Some, 

 however, was mined near the old Perry furnace and smelted 

 there, many years ago, with ore brought from Catawi-^ a . 



The line of outcrop of this ore may be traced across the 

 county by any one who wishes to do it by following the 

 line between the Hamilton sandstone and the Hamilton 

 upper shale, on which horizon it will always be found if 

 present. It varies much in thickness, as do the other ore- 

 beds, sometimes thinning down to almost nothing. 



Little or no appearance of the Hamilton fossil ore is to 

 be seen in the northeast of the county, where the Hamilton 

 sandstone slopes down from the Tuscarora anticline along 

 Pfoutz's valley. 2s or have I observed or heard of ir- oc- 

 currence along the whole line of outcrop rhence to Sandy 

 hill. But it begins to show itself on the south side of the 



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