THE MINING AND QUARRY INDUSTRY I9QI2 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 $809,414 in 1911 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 
IQII IQI2 
MATERIAL 
CUBIC 2 CUBIC . 
YARDS ee YARDS YALUE 
Crushed stone for roads...... 850 322 | $696 367 | 283 628 | $207 957 
Crushed stone for other pur- 
(ONES Neral cael 3) ida ee 267 930 199 797 391 681 275 9(6 
MMASTRIITOS! 2 yates woe = § 185 BEI COIN mee Set || obs 0 
Billets corse en ett fi. I 118 437 | $899 414 | 675 309 | $483 863 
