THE MINING AND QUARRY INDUSTRY I912 8l 



Production of marble 



VARIETY 



1910 



1911 



1912 



Building marble 



Monumental 



Other kinds 



$252 965 



88 684 



231 



$171 748 

 79 ii5 



2 7 I78 



$155 411 

 84 511 



I 925 



Total 



$341 880 



$278 041 



$241 847 



NOTES ON NEW YORK MARBLE QUARRIES 



The marble resources of the State have been described only in a 

 very general way, and the published information is mainly contained 

 in the reports of the Tenth Census and Smock's bulletin on " Build- 

 ing Stone in New York " which reflect conditions as they existed 

 twenty-five years or more ago. The following account of some of 

 the developed quarries has been prepared from observations made 

 in the summer of 191 2, intended as a basis for a detailed geological, 

 petrographical and chemical study of the subject. 



Gouverneur district. The principal area of crystalline lime- 

 stones with their interbedded gneisses, schists and quartzites, which 

 together represent the Grenville series of the Adirondack region, 

 is exposed in southwestern St Lawrence county and the contiguous 

 part of Jefferson county in the interval between the Adirondack 

 highland and the St Lawrence river. The area is irregular in out- 

 line, but is drawn out along a northeast-southwest direction which 

 is the main structural trend of the region. The northeastern section 

 in Canton and DeKalb townships, St Lawrence county, consists of 

 a narrow belt a mile or so wide, but as it continues southwesterly 

 into Gouverneur, it expands so as to cover most of that town and 

 the adjoining towns of Macomb and Rossie on the north and west, 

 narrowing at the county line and soon terminating in the towns of 

 Antwerp and Theresa, Jefferson county. The total surface covered 

 by this body of Grenville strata may be placed at approximately 

 175 square miles. 



Throughout the area, the limestone is the most persistent and 

 conspicuous member of the series, but it gives way locally to mi- 

 caceous, pyritic schists, graphitic or glassy quartzites and dark horn- 

 blende gneisses and amphibolites. The several formations have the 

 appearance of an interbedded but strongly folded, compressed and 

 altered series of sediments. Subsequent to their folding and meta- 



