THE MINING AND QUARRY INDUSTRY ICjI2 



97 



has been obtained from this region, chiefly from the vicinity of 

 Haverstraw and Nyack, but to some extent from near Richmond, 

 Staten Island, where the sheet has its southern termination. Smaller 

 occurrences of diabase are found in the Adirondacks and the bord- 

 ering area. There are countless numbers of trap dikes in the in- 

 terior of the Adirondacks, but very few have any considerable 

 thickness and in general they are too remote from the market to be 

 profitably quarried. In the outlying region the dikes at Greenfield, 

 Saratoga county, and at Little Falls, Herkimer county, are the most 

 notable. Quarries have been opened at the former locality and the 

 trap is crushed for road material. 



Production. The trap industry in Rockland county has been in 

 an unsettled state during the past year, owing to the development 

 of the plans for the Palisades Park. The lands to be set aside for 

 the latter include a strip along the river that covers the more 

 accessible part of the trap intrusions, and the abandonment of all 

 operations in that section of Rockland county is in prospect. So 

 far, only the property of the Manhattan Trap Rock Co., of Nyack, 

 has been actually taken over and closed down previous to the open- 

 ing of last season, but the contribution from other quarries was 

 considerably reduced. 



The value of the trap produced in 1912 was $483,863 as com- 

 pared with $899,414 in 191 1 and $909,006 in 1910. The whole 

 output consisted of crushed stone, although in previous years build- 

 ing stone and paving blocks have also been produced to some extent. 

 The quantity of crushed stone made was 675,309 cubic yards, of 

 which 283,628 cubic yards, with a value of $207,957 was reported 

 as sold for road purposes and 391,681 cubic yards valued at 

 $275,906 for railroad ballast, concrete and other purposes. Alto- 

 gether, there were six firms represented in the industry, of whom 

 five operated in Rockland county and one in Saratoga county. 





Production of trap 









1911 



19 



12 



MATERIAL 



CUBIC 

 YARDS 



VALUE 



CUBIC 

 YARDS 



VALUE 



Crushed stone for roads 



Crushed stone for other pur- 

 poses 



Other kinds 



85O 322 



267 9^0 

 185 



1 118 437 



$696 367 



199 797 

 3 250 



283 628 

 391 68l 



$207 957 



275 9^6 







Total 



$899 414 



675 309 



$483 863 



