74 NEW YORK STATE MUSEUM 



saturated and injected by the Laurentian white granite and then 

 subsequently injected by the Algoman granite. The presence of this 

 later rock here indicates to the practical miner that it very likely cuts 

 off the ore in depth as is shown by the vertical section. See figure 



I?- 



Structure. The beds, including the graphitic layer, are dipping at 

 an angle of 25 ° to the southeast. Considerable variation from this 

 figure is to be expected as the dip is rarely constant for any great 

 distance. This is well shown in the main pit. Near the eastern end 

 a dip of 26 S 35 E was measured, while directly north of the 

 office on the north road 32 ° S 18 E was noted. The twice injected 

 gneiss on the south road was found to have the following dip: io° S 

 20 E. Other observations show that the beds are probably flat- 

 tening as they continue to the southeast. 



Along the south road beyond the limits of the map, the quartzite, 

 very free from the Laurentian granite, essentially the typical Swede 

 Pond quartzite, was found succeeded by the Hague gneiss and the 

 Dresden amphiboiite in the reverse order, due to isoclinal folding; 

 the rocks have been folded back upon themselves. The rocks all 

 show crinkling and stretching. A careful search for the ore that 

 normally lies between the Swede Pond and the Hague gneiss, re- 

 vealed only a narrow black band with the graphite flakes stretched, 

 rubbed and polished. The unresistant Dixon schist on close folding 

 is stretched and pulled out into a narrow band which often breaks 

 under such excessive strains. 



In spite of this pinching of the ore and the cutting out by the 

 Algoman granite, there is an immense amount of ore, perhaps a 

 million and a half tons, within the property. 



The ore. The graphite schist is the familiar Dixon schist very 

 similar to the rock being mined at Graphite by the American 

 Graphite Company- Perhaps the schist here has not been so 

 squeezed and is harder and firmer than some of the best ore, say, 

 from the Summer pit. 



It is a quartz- feldspar combination with dominant quartz, 65 to 80 

 per cent, feldspar 15 to 30 per cent, and accessory graphite, biotite, 

 chlorite and pyrite. The micro-analyses, tabulated below, although 

 only approximate, show the relations fairly well. The ore from the 

 main pit, which is located near the eastern limit of the outcrop, does 

 not exhibit the best ore on the property, as is revealed by the series 

 of test pits farther westward. The rock now mined carries a small 

 flake which is highly involved with chloritic material. The latter is 



