QUARRIES IN YORK COUNTY. 175 
Some tests of a Millbridge granite, quarried at White Rock Moun- 
tain by S. L. Treat & Co., were made in 1895 by the United States 
Ordnance Department at the Watertown Arsenal." These give it a 
shearing strength of 2,820 pounds, a transverse strength of 2,069 
rounds, and a compressive strength of 19,917 pounds, all per square 
rich. 
The Millbridge quarry was not visited by the writer, and the firm 
failed to reply to questions as to dimensions of quarry, plant, and 
Droduct. 
YORK COUNTY. 
The granite quarries in York County are in the towns of Alfred, 
Berwick, Biddeford, Hollis, Kennebunkport, and Wells. 
The Bennett quarry is in the town of Alfred, 1 mile southwest of 
Alfred village, south of Portland and Rochester Railroad, at the 
lorth foot of a 480- foot hill. Operator, Bennett Brothers (John H. 
md Edward), Alfred, Me. 
The rock (specimen 153, a) is a quartz diorite of slightly greenish 
lark-gray color, with conspicuous black mica, and of medium, even- 
drained texture, with feldspars up to one-fourth inch and biotite 
>cales under one-fifth inch. It consists, in descending order of abund- 
mce, of a grayish soda-lime feldspar (oligoclase), black mica (bio- 
ite) , quartz (smoky or milky), dark hornblende and magnetite, with 
iccessory titanite, zircon, apatite, and secondary epidote and a white 
nica. The oligoclase is often in good-sized twins and is intergrown 
vith orthoclase and quartz, and generally cloudy and altered by a 
vhite mica. The only contrast in this stone is that between the gray 
)f the feldspar and quartz and the black mica. After one or two 
rears' exposure the feldspar loses its slightly bluish tinge and assumes 
i greenish one, which is attributed to the oxidation of its ferrous 
i>xide. (See on this subject p. 54.) 
The quarry, opened prior to 1875, measures 60 by 150 and is up to 
M) feet in depth. 
Rock structure: The sheets, measuring up to 12 feet in thickness 
md inclined, are crossed by vertical joints striking N. 70° E., re- 
curring at intervals of 10 feet and forming a heading 8 feet wide in 
:enter of quarry. Another set, also vertical, and striking N. 20°-25° 
W., recurs at intervals of 20 feet. The rift is horizontal and the 
'rain vertical, with course N. 70° E. The sap is 2 inches thick along 
he sheets. A vertical bed of sand, 6 inches thick, lies in the central 
leading. 
The plant consists of 1 hand derrick. 
Transportation is effected by cartage of a mile to Alfred railroad 
Nation. 
a Rept. of tests of metals, etc., for 1895 (1896), pp. 319, 325, 344, 409. 
