


In Maine there are in operation to-day only quarries of granite, gneiss and gabbro, and of roofing slate. Very many of the granite quarries lie so near the water's edge that cost of transportation is reduced to the minimum, and hence quarries are enabled to compete with others, even in markets at a great distance. The roofing slates lie remote from water ways and only the general excellence of the materials enables them to compete with others beyond the state limit. The output of these materials for 1889 was: of granite 6,701,346 cubic feet valued at $2,225,839.00, and of slate $41,000 squares, valued at $201,500.00.
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