ADIRONDACK MAGNETIC IRON ORES IOl 



the pit for 150 feet. The containing rock has a granitic texture and 

 in other respects is analogous to an acid intrusive. 



Two diabase dikes, each about 15 feet thick, cut the ore. One 

 of these runs nearly parallel to but west of the outcrop, standing 

 as a vertical wall when seen underground. It sends off a small 

 offshoot from the eastern end but holds its width undiminished 

 so far as it can be traced. The second dike intersects the deposit 

 at the Big pit, crossing at an oblique angle and continuing in a 

 northerly direction over the summit of the hill. The dikes have 

 exerted noticeable contact effects upon the ore in the development 

 of a black garnet (brown in thin section), which has been formed 

 at the expense of the magnetite and feldspar, as well as by rendering 

 it dense and exceedingly hard. A considerable quantity of the 

 garnetiferous ore can be found on the waste dumps, having proved 

 evidently too refractory to be used. 



Description of workings. The ore body has been excavated for 

 a long distance as an open pit, with chambers extending down the 

 dip when the depth became too great for removal of the overlying 

 rock. In places the surface workings have caved and are inaccessible. 

 The Elliot slope enters the hill on the southwestern side at a little 

 over 900 feet elevation. It pitches nearly north. The slope was 

 the last one opened and is said to follow a shoot of ore 9 feet thick. 

 The adjoining White Flint slope, somewhat higher up, also pitches 

 north at an angle of 70 at first, but flattens downward; it is bot- 

 tomed at 1200 feet. The breast of ore, judging from the visible 

 part of the excavation, must have measured about 20 feet. The 

 ore contains a good deal of milky quartz, but is rich compared with 

 the general average. Between this and the Big pit the north-south 

 dike intervenes and the ore body swings off toward the east. The 

 Big pit is the deepest of all, 2200 feet on the dip which begins at 

 6o° and is nearly horizontal at the bottom. The Summit pit at 

 the highest point of outcrop of the deposit is credited with a depth 

 of 1000 feet and dips about 30 . Of the other workings, the Little 

 pit, opened by the Peru Steel & Iron Co., and lying near the eastern 

 end, is the largest. The slope has a length of 1200 feet and follows 

 a shoot 10 feet thick and 100 feet wide across the dip. 



Character of the ore. In texture the ore is rather fine. Its 

 appearance and mode of occurrence is much like the Lyon Mountain 

 ore. The gangue consists mostly of microcline, orthoclase and 

 quartz, with a very small proportion of ferromagnesian minerals 

 in the form of augite and biotite. Phosphorus and sulfur fall within 

 the Bessemer limits. The chemical composition is shown by the 



