QUARRIES IN WASHINGTON COUNTY. 163 
cite. It takes a high polish, and the hammered and cut surfaces 
are very light. The stone is suitable for monumental work. Dr. 
George Otis Smith, who visited the Gardner prospects in 1903, 
states that " pink granite occurs intrusive in the dioritic rock in 
such a manner that both kinds of stone could be quarried from the 
same opening." One part of the dioritic rock he found in thin 
section to be in reality a diabase. 
Mingo, Bailey <& Company's Mack- granite quarry is in the town 
of Calais, about 6 miles south of Calais, on the southwest side of the 
road to Redbeach, on the north side of an east -west ridge, near top. 
Operator, Mingo, Bailey & Co. ; office, Redbeach, Me. 
The rock (specimen 103, a) is a norite, of almost black with 
slightly greenish tinge and fine to medium even-grained ophitic 
texture, consisting, in descending order of abundance, of a whitish 
soda-lime feldspar (andesine) considerably altered to a white mica, 
hypersthene (some of it partially or entirely altered to fibrous actin- 
olite), magnetite, and black mica (biotite), with accessory pyrite. 
The stone takes a fine polish and affords a very light hammered or 
cut surface. 
The quarry measures 50 by 15 feet and up to 20 feet in depth. The 
sheets are about 10 feet thick. Vertical joints, striking about east 
to west, recur at intervals of 1 to 3 feet. 
There is one derrick. The quarry is worked only occasionally, and 
the stones are carted to the company's cutting shed, near Redbeach, 
on the St. Croix River. 
The Beaver Lake black-granite quarry is in the "town of Calais, 
near the north end of Beaver Lake, 4 miles west of Redbeach village. 
Operator, Maine Red Granite Company; office, Redbeach, Me. 
The rock (specimen 96, g) is a mica-quartz cliorite of general dark- 
gray shade (black mottled with white and gray) and of coarse to 
medium porphyritic texture, with feldspars up to one-half inch in 
diameter. It consists, in descending order of abundance, of a grayish 
feldspar containing both soda and lime (andesine-labradorite), black 
pornblende, black mica (biotite), magnetite, and a little quartz, 
together with accessory pyrite, caicite, and apatite. The feldspar is 
partly altered to kaolin and a white mica, producing the milky-white 
arts of the feldspars seen in the polished specimen, and some of the 
ornblende is fibrous. The stone takes a high polish and when ham- 
ered or cut has a very light surface. 
The quarry, opened in 1885, measures 250 feet from north-northeast 
o south-southwest by 75 feet across, and has a working face on the 
past 30 feet in height. Its drainage requires the use of pumps in 
spring. 
Rock structure : The sheets, from 6 inches to 7 feet inches thick, 
dip 15° W., and are lenticular in form. The upper 10 feet of the face 
