QUARRY MATERIALS OF NEW YORK 1 89 



follows the northeasterly jointing and is from 2 to 3 feet thick, 

 consisting of a serpentinous groundmass with lath-shaped feldspars. 



The two openings near the mill, known as the St Lawrence 

 quarries, are vertical rock cuts with an area of about 20,000 square 

 feet each and a depth of 80 feet in the northerly quarry and 40 feet 

 in the southerly one. They have supplied large quantities of build- 

 ing marble, of which examples are seen in the First Presbyterian 

 church, Gouverneur ; Grace church, Watertown ; Jay Gould Memo- 

 rial, Roxbury ; Third Presbyterian church, Rochester ; and in many 

 other structures. For building purposes it is mostly used as rock 

 face ashlar which has a bright gray color. The monumental stock 

 is mainly the selected darker quality that is sold under the name 

 "St Lawrence" but includes some lighter stone called " Adirondack." 

 The beds here dip about 20 to the northwest. They have been 

 penetrated to a depth of 400 feet in a drill hole near the cutting 

 works. 



The quarry equipment includes six channeling machines, two 

 gadders and three derricks. The mill has sixteen gangs of saws, 

 besides rubbing beds, lathes, and polishing machines. Electric 

 power is used, supplied by the Hailesboro water power plant. 



A chemical analysis of the marble from Extra Dark quarry is 

 found on page 186. 



The company states that the marble has a specific gravity of 2.76, 

 corresponding to a weight of 172 pounds to the cubic foot. The 

 ratio of absorption is .160. 



Gouverneur Marble Company's quarries 

 The Gouverneur Marble Company owns quarries in the north- 

 eastern section of the marble 'belt, adjoining the property of the 

 St Lawrence company. The principal one is a cut about 250 feet 

 long and nearly as wide, with a depth of about 50 feet. A new open- 

 ing 125 feet long and 50 feet wide has been made just southeast 

 of the large quarry with which it will eventually be connected. 

 The bedding here dips very low to the northwest. The jointing is 

 in two systems, N. 40 W. and N. 50 E. which with the floor 

 seams divide the marble into rectangular blocks. A test hole in 

 the new quarry penetrated the marble to a depth of 95 feet. 



The product runs mostly to the medium and light varieties, but 

 the new opening shows considerable darker marble from the under- 

 lying beds. The grain is moderately coarse, with a grain diameter 



