THE MINING AND QUARRY INDUSTRY I9II 25 



grade consists of pink microcline practically free of quartz. It is 

 all sold in crude condition for pottery use. No. 2 consists of white 

 albite with more or less quartz and is ground at the local mill 

 before shipment. It goes mainly to enamel ware manufacturers. 

 No. 3 grade carries quartz, as well as more or less of the iron- 

 bearing minerals, and finds application in glass manufacture. It 

 is likewise ground locally. 



The quarries in Essex county are situated near Ticonderoga and 

 Crown Point. Those at the former locality are owned by the 

 Barrett Manufacturing Co., which utilizes the product mostly for 

 prepared roofing material. The pegmatite is broken down and 

 sent to the mill without sorting. It is thus a mixture of feldspar, 

 quartz and other minerals. 



The quarries of the Crown Point Spar Co., just south of Crown 

 Point, produce crushed feldspar for roofing purposes, poultry grit 

 and concrete, and some that finds use in enamel ware. They are 

 situated on top of Breed's hill, an elevation mainly composed of 

 black hornblende-biotite gneiss in which the pegmatite appears to 

 form a bosslike intrusion measuring several hundred feet in diam- 

 eter. The feldspar consists of pink microcline and white or green- 

 ish albite. It is frequently intergrown with quartz, but may form 

 separate masses up to 5 or 6 inches in diameter. Biotite is the 

 chief dark mineral and appears in seams, or as a coating on the 

 feldspar. The pegmatite has been squeezed or fractured, and there 

 is a noticeable development of secondary chlorite. The quarries 

 are connected with the mill which is situated at the lakeside over 

 a mile away by an aerial tram. The product is there crushed and 

 graded into different sizes for use as roofing material, poultry grit, 

 and in concrete. A part of the product is sold also to the enamel 

 ware trade. 



The production of feldspar, including crushed unsorted pegma- 

 tite, amounted in 191 1 to 15,652 short tons valued at $61,769. This 

 showed a slight gain compared with the totals reported for pre- 

 vious years. In 1910 the output was 12,132 short tons valued at 

 $46,863 and in 1909 it amounted to 13,871 short tons valued at 

 $46,444. Market prices remained unchanged ; the crude feldspar 

 for pottery uses brought about $3 a ton, the ground spar for 

 pottery and enamel ware $6, and the crushed material for roofing, 

 poultry grit, etc., about $3 a ton. 



