122 NEW YORK STATE MUSEUM 



It is apparent that the percentage of free silica in the form of 

 quartz must be small. The relative proportions of the chem- 

 ical constituents agree quite closely with those found in many 

 syenites. 



^jParkhurst mine. This mine has been opened on the north- 

 eastern part of the ore belt. The shaft is about 2 miles from Lyon 

 Mountain station. Within a short distance north of the Williams 

 mine the outcrop of the deposits passes beneath drift and is nowhere 

 exposed over the northern section. There is no interruption in the 

 lines of magnetic attraction, however, so that it seems safe to 

 assume that the ore continues unbroken in the interval which is 

 something over a mile. 



The shaft has been put down on the slope of a small hill at a 

 point a few hundred feet east of the railroad and perhaps a hundred 

 feet above it. The shaft was located with a view to striking ore near 

 the outcrop, the line of which had been previously approximated 

 by magnetic determinations. The first work on the shaft was 

 done over 20 years ago. After passing through 70 feet of drift, 

 rock was encountered and sinking was discontinued for a time. 

 Later on a drill hole which had been put down in the bottom of the 

 shaft showed ore at a depth of 145 feet from the surface with an 

 apparent thickness of 48 feet and an average iron content of 40.41 

 per cent. The shaft was then sunk to the ore and mining begun. 

 In the period of operations from 1889 to 1892 inclusive the output 

 according to company records amounted to about 40,000 tons, of 

 which 37,500 tons was classed as furnace ore and was smelted 

 without concentration in the furnace at Standish. 



The shaft is now partially filled with water, preventing access 

 to the underground workings. The character of the rock dumps 

 about the shaft indicate that the walls are made up of a schist 

 similar to that at the Williams mine. There is much pegmatite in 

 both ore and country rock and the existence of one or more diabase 

 dikes is inferred. 



The magnetite has a granular texture, coarser than the average 

 of the ore found in the workings farther south, and is intermixed 

 with a gangue consisting mainly of quartz and feldspar. It con- 

 tains apatite in crystals and grains of macroscopic size, indicating 

 a fairly high phosphorus content. According to analyses that were 

 made during the period of operations, the ore shipped to the Standish 

 furnace averaged 49.73 P er cen ^ i ron and about .1 per cent phos- 

 phorus. The following two analyses furnish additional particulars 

 as to the character of the ore. 



