ADIRONDACK MAGNETIC IRON ORES Jl 



The Cheever ore resembles very closely the Old Bed variety at 

 Mineville. It is not quite so rich in phosphorus, but is still 

 rather high in this element. Mr Putnam foir the Tenth Census 

 [XV: 114] took six samples, four underground and two from stock 

 piles on the surface, which showed the following percentages: 



Iron 65.33 63.5 63.86 64.42 64.77 6 3-° 8 



Phosphorus. 0.643 0.603 0.689 0.452 0.673 0.573 



Titanic acid was found in five of the six, but its amount is very 

 small. The ore is rich and as shown by the analyses, it is of quite 

 remarkable uniformity. Recently [1907] a small magnetic mill 

 has been built and concentration of the leaner unused ore is to be 

 attempted, accompanied by a reduction of the phosphorus. 



Nos. 5 and 6. These two pits are called the Pilfershire. They 

 lie at the western foot of the ridge which intervenes between 

 Moriah Center and the lake. Not far above them is the Grenville 

 with its limestones, and the relations are extraordinarily like those 

 at Cheever. Even the gabbro appears not far to the eastward as 

 detected by F. L. Nason, who has called the writer's attention to it. 



The southern pit is a small one and of no particular importance. 

 The northern pits consist of three larger and two smaller openings. 

 They strike nearly north and south and dip 6o° west, passing below 

 the highway 50 feet lower down. The wall rock is the familiar 

 green gneiss which in thin section shows plagioclase and pyroxene. 

 The mines are now abandoned and full of water. 



The close parallelism between the geological relations here dis- 

 played and those at the Cheever is worthy of emphasis. In both 

 the ore belt strikes nearly north and south and dips at about 

 6o° west. It is in the characteristic green gneiss of almost identi- 

 cal mineralogy. Just above are the Grenville limestones. Just 

 below but after an interval of gneiss is the gabbro. Between 

 the two stands a ridge of old syenitic gneisses, with no Grenville 

 involved and extending 2 miles without a break. Undoubtedly 

 faulted upward, they make a mountain summit, 500 feet above 

 the Pilfershire and 1000 feet above the Cheever. 



Nos. 7 through 11. Mineville group. 1 A general outline of the 



: In the preparation of tnese notes, every possible kindness has been 

 extended to the writer by Mr S. Norton, general manager of Witherbee, Sher- 

 man & Co., Mr S. LeFevre, chief engineer, and Mr Rogers Hunt, assistant 

 engineer. Mr Guy C. Stoltz, engineer for the Port Henry Co., has been 

 equally courteous and helpful in affording data and advice regarding the 

 adjacent properties. 



