ADIRONDACK MAGNETIC IRON ORES 115 



group of workings in the near vicinity of Lyon Mountain, and 

 Parkhurst shaft which lies about 2 miles northeast of the latter. 



Mine 81. This mine is a little over 2 miles in a direct line south- 

 west of Lyon Mountain on the southern face of a prominent ridge 

 which offshoots from Averill peak toward Upper Chateaugay lake. 

 The deposit strikes n. 20 e. into the ridge. It is reported to have 

 been traced by magnetic readings across the ridge toward Lyon 

 Mountain and its strike brings it in line with the Phillips ore body 

 west of the main group. It has been mined along its course for a 

 distance of 1000 feet or more. At present the only accessible work- 

 ings are two drifts near the surface, the shafts being dismantled 

 and filled with water. The eastern drift which lies higher upon 

 the ridge is approximately 600 feet long and from 25 to 75 feet 

 high, and is open cut for some distance from the entrance at the 

 south end. On the western section there are three shafts, with a 

 drift from the central shaft extended in the direction of the first, 

 but at a slightly lower level. Two of the shafts have been carried 

 down to a depth of 400 feet and a series of levels was opened shortly 

 before the mine was abandoned. The ore averages about 18 feet 

 thick with only minor pinches and swells. It stands nearly vertical, 

 inclining slightly to the east in some places and in other parts 

 slightly to the west. 



The adjoining gneiss is the augite variety, almost massive and 

 carrying little quartz. Specimens from near the contact show 

 abundance of titanite and some hornblende. There is little or no 

 gradation along the walls; practically the entire width of the ore 

 zone is occupied by the workings. 



Several dikes are found in the eastern drift. They are all diabase. 

 The smallest is about 3 inches and the largest about 3 feet wide. 

 Their direction is northwest-southeast, except in one instance 

 near the heading of the drift where a 2 -foot dike occurs on the 

 north side of the ore body running nearly parallel to it. According 

 to local records, the mine was the first one to be explored in the 

 Lyon Mountain district and was worked to some extent as early 

 as 1840. No systematic mining was undertaken, however, until 

 1878 when the western drift was opened. The eastern drift was 

 opened in 1880. The ore was hauled by wagon to the forges at 

 Clayburg. According to Smock, mining was suspended about 

 1885; but operations were resumed a few years later and continued 

 up to 1902, since which time the mine has been idle. 



The ore does not differ in appearance from the general run of 

 the mines at Lyon Mountain. It is a granular aggregate of magne- 



