142 Report on Building Stone of New York. 



Red slate is quarried here, and the greater part of it is worked up 

 into roofing material and tiles for flooring. The mill for sawing the 

 tile is at the east side of the quarry. Steam pumps, steam drills and 

 steam derricks are here in use. From eighteen to twenty men are 

 employed during the working season. The manufactured slate and 

 tile are carted to Whitehall, six miles north-west of the works, and 

 there shipped to markets. 



The Hall mill for tiles is located at North Granville. A novel use 

 of the waste from this quarry is grinding it for paint. It is used as 

 a filler In making oil-cloth also. The Hall quarry is represented in 

 the Gilsey House, New York city. 



The Ainsworth quarry is about 40 rods north of that of Hall, and 

 is in the low ground. Its dimensions are, approximately 150 feet on 

 the line of strike by 80 feet in width, and 80 feet deep, at the east 

 side. The beds here opened are a little west of the range of the 

 Hall quarry, and lower. There is a remarkable fold in the strata, thus 

 exposed in the vertical sections of the north and south walls of the 

 quarry ; and the arch or crown is seen at the west and the axis fur- 

 ther east, dipping eastward at about the same augle as the dip of the 

 strata above and below it — 40° south 82° east. The rock in this 

 fold and middle section of the quarry is hard and does not work well, 

 and it is thrown out as waste. The best material is found in the 

 bottom beds, under the fold. The main system of seams, or joints, 

 runs an east-west course, vertically ; a second set, with calcite- coated 

 surfaces, trends in an east-north-east direction, and vertically. The 

 quarry water comes largely from the swampy surface. It is raised 

 by a steam pump. The hoisting of the slate blocks is by a horse- 

 power derrick. The slate is of bright-red color, and homogeneous 

 in texture. A part is worked into roofing at the quarry, and a part 

 is carted to Middle Granville, and thence is shipped to the mill at 

 Castleton, Vermont, where it is cut into tiles, sills, lintels, billiard 

 table tops, etc. This quarry is on the Holcombe farm. Hiram 

 Ainsworth, of Castleton, Vt., is the lessee. It was opened first four- 

 teen years ago. The working season lasts from nine to ten months 

 each year. 



Herbert's quarry consists of two small openings about 200 yards 

 north of the Ainsworth quarry. The southern one only is worked. The 

 dip of the strata here is 45° (approximate) and eastward. The slate 

 is bright-red, and it is well exposed in the outcropping ledges near 

 the quarry on the west side. The surface rock has somewhat of red 



