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Oneonta Dolomite is composed of both limestone and dolomite, with
the latter distinguishable from the former by reason of its
greater magnesium content. Petitioner's dolomite is of
insufficient purity to be considered metallurgical or chemical
grade.
Most limestone and dolomite in Minnesota and neighboring
States is of a buff or brownish-gray color. Petitioner mines
buff and brownish-gray dolomite from its quarries. Petitioner
also has mined a reddish-brown colored dolomite from two of its
quarries at Shakopee, Minnesota. The reddish color most likely
is caused by its iron oxide content. We shall refer to this
particular dolomite as red dolomite. During 1989 and 1990,
petitioner mined red dolomite from its Merriam Quarry, located in
Shakopee, Minnesota. Petitioner currently mines red dolomite
from its 169 Quarry, which is located approximately one-half mile
from the Merriam Quarry.
Road material is aggregate2 used in the construction of
roads. Typically, a base consisting of crushed and graded
aggregate is placed on roadbeds, parking lots, and in utility
trenches to provide support for the overlying pavement or
utility. Road material aggregates are also material mixed with
2 "Aggregate" is: "1. rock composed of mineral crystals of
one or more kinds or of mineral rock fragments. 2. any of
several hard materials (as sand, gravel, or slag) used for mixing
with cement material to form concrete, mortar, or plaster."
Webster's Ninth New Collegiate Dictionary 64(1985).
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Last modified: May 25, 2011