THE MINING AND QUARRY INDUSTRY I9I3 79 



angles. A 12 foot diabase dike intersects the quarry face in an 

 east-west direction. The rock is fine in texture, except for the 

 residual crystals which range from a fraction of an inch to several 

 inches across. At the second quarry, which is a pit opening, the 

 rock is coarser and contains a larger proportion of residual feld- 

 spars. The joints here run southeast-northwest and northwest- 

 southeast with a horizontal set at intervals' of 3 or 4 feet. A dike 

 of trap and one of syenite porphyry were, noticed in the walls 

 of the quarry. 



On the shores of Augur lake occur extensive exposures of anor- 

 thosite ; in some places cliffs rise from 75 to 100 feet directly from 

 the lake. The material varies in texture and appearance from place 

 to place. Some varieties have a dark color and contain a large 

 percentage of iron-magnesia minerals in the form of pyroxene 

 and biotite. Other types of the rock are light gray or greenish, 

 being then more feldspathic. The places prospected by the Empire 

 State Granite Co. are on the west side of Augur lake. Nearby is 

 a quarry on the property of C. B. White which was worked several 

 years ago and the product shipped to New York for use in the 

 Criminal Courts building. The stone is of light gray color. The 

 quarry opening is on top of a ledge 80 feet above the lake and is 

 about 150 feet square. 



The anorthosite from this section is a strong durable material, 

 well adapted for most structural purposes. It takes a good polish 

 and is attractive on account of its rare color. The polished samples, 

 however, show minute hairlike fractures which seem to mark the 

 direction of the rift and grain. Apparently their presence does 

 not materially weaken the structure, as the crushing is equal to 

 that of the average granite. Tests made by the office of public 

 roads in Washington showed an ultimate strength of 20,500 pounds 

 a square inch on a specimen from the Smith property and 18,500 

 pounds on a specimen from Augur lake. 



Parishville. A new monumental and structural granite has been 

 quarried at Parishville in eastern St Lawrence county. The stone 

 has. been ma.rke.ted under the name of the St Regis Red Veined 

 Granite. . It has a dark red fine-grained body in which appear curved 

 and . branching vginlets of bright red color and somewhat coarse 

 grain, but of the same mineral composition as the rest. The vein- 

 ing is not sharply defined but shades off on the borders and in 

 places developes into round or irregular unclear patches which give 

 the effect of clouds of lighter color. The appearance of a polished 



