IRON ORES 



347 



vents observation. The belt continues beyond the Ke-w Bed to the 

 south, as recent drilling has tapped it. 



In this section, the wall rock near the ore at the Lovers Hole, ia 

 seen to contain plagioclase and orthoclase, brown biotite, green horn- 

 blende, titanite, zircon and magnetite and is an ordinary quartzless 

 gneiss. A specimen from the top of Barton Hill was shown by the 

 same form of examination to contain quartz, microperthitic orthoclase 

 in great amount, diallage and hornblende, being very like the rock 

 mentioned above as occurring near " 21." These rocks are all gneisses 

 that often but not always become more basic toward the ore body. 

 Sections from the wall rock at Fisher Hill and the Burt Lot mines 

 are practically the same. 



Along with the ore or near it in the wall rock, are at times masses 

 of very hornblendic rock. When cracked open these occasionally 

 show small zircons, apatites and very fair titanite crystals. 



At the South Pit some excellent red garnets up to 1" in diameter 

 have been brought to light, in talcose or chloritic material. They 

 were very brittle and crumbled with slight rubbing. 



The Lovers Hole pit has also yielded considerable fluorite, which, 

 of white, red and green colors, gave rather fine specimens. It had 

 more or less magnetite disseminated through it. It was probably 

 from a small vein-tilling or in part a replacement of the gneiss. 



Fine cleavage pieces of plagioclase are also to be had on the dumps. 

 The beautifully striated surfaces contain at times several square inches. 



The Pilfershire and Pease Pits. These are now abandoned. 

 They lie along the westerly foot of the range of gneissic hills that 

 separate Mineville and Moriah Center from the lake. Both mines 

 are now full of water. They strike a little west of north and 

 dip 50° to 60° west. The gneiss just to the south of them contains 

 quartz, microcline, orthoclase, very little plagioclase, emerald green 

 pyroxene, and a little magnetite. The lean ore in thin section 

 exhibits magnetite, light green pyroxene and apatite. As elsewhere 

 the gneiss is more basic near the ore. ' 



The Lee Mine. This is just back of Port Henry and in gneiss 

 immediately west of the ophicalcite exposures. The outcrop of ore 

 is in a small steep hill on the west side of the fault figured on the 

 map. The strike at the main opening is west of north and the dip 

 at the skipway is 19° W. Mr Putnam (10th Census Vol. X. p. 115) 



