THE MINING AND QUARRY INDUSTRY I906 



69 



as the Palisades. The southern end of this intrusion is found in 

 Staten Island, where it extends southwest from Port Richmond. 



The principal use of trap is for crushed stone for roadmaking and 

 concrete. It possesses qualities of strength and durability which 

 place it first among the varieties of stone used for these purposes. 

 The sombre color and the difficulty of dressing trap limits its em- 

 ployment in building work. It is used to some extent for paving 

 blocks. 



Rockland county produces most of the trap at the present time. 

 The principal quarries are those at Rockland Lake operated by the 

 Clinton Point Stone Co., and the Rockland Lake Trap Rock Co., 

 those at Mt Joy worked by H. M. Gurnee, the Haverstraw quarries 

 worked by the Haverstraw Trap Rock Co. and the Long Clove Trap 

 Rock Co., and the quarries at Nyack operated by the Manhattan 

 Trap Rock Co. The output of the county in 1906 amounted in value 

 to $780,703. 



In Richmond county the Quinroy Construction Co. operates quar- 

 ries at Port Richmond. 



The Saratoga Trap Rock Co. has opened a quarry in the town 

 of Greenfield, 2 miles north of Saratoga Springs, where a dike about 

 200 feet wide is exposed. This is one of the largest of the Adiron- 

 dack dikes. At' Northumberland in the eastern part of Saratoga 

 county, the Champlain Stone & Sand Co. has begun operations on 

 a partially serpentinized diabase. 



The production of trap in New York last year was valued at 

 $847,403, as compared with a value of $623,219 reported for 1905, 

 and $468,496, the value of the output in 1904. Crushed stone was 

 the principal item in the totals, aggregating 851,293 cubic yards 

 valued at $780,103 in 1906, against 774,111 cubic yards valued at 

 $601,669 and 610,285 cubic yards valued at $452,621 in the two 

 preceding years respectively. The greater part of the crushed stone 

 was sold for road material, though the quantities thus used can not 

 be accurately stated. 



Production of trap 





19 



05 



1906 





Cubic 

 yards 



Value 



Cubic 

 yards 



Value 



Crushed stone 



774 III 



$601 66q 

 21 550 



851 293 



$780 103 

 67 ^00 



Paving blocks etc 









Total 





$623 219 





$847 403 









