The remainder of this extensive territory ranges at altitudes of 3000 to 4500 ft., even in the bottoms of the river valleys and in the lower plains; while the ridges which constitute the water-partings rise about 2000 ft.
From each other by their partings, but making together one great bed of from 25 to 40 ft.
The partings together do not amount to more than 2 or 3 ft.
The nature and extent of these operations vary with the character of the coal, which if hard and free from shale partings may be finished by simple screening into large and nut sizes and smaller slack or duff, with a final hand-picking to remove shale and dust from the larger sizes.
The drainage basin measured from the water-partings of the enclosing mountains is some three times as great.
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