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In Minnesota, railroads generally use granite, gabbro, or
taconite for ballast. Dolomite is not generally used because it
is softer than desirable.
Rubble is a loose mass of angular fragments of rock or
masonry crumbled by natural or human forces and irregular
fragments or pieces of rock used in masonry or the masonry made
with such rocks. The type of angular rock which may be
incorporated in the rubble could be virtually any type of rock
that is used in manmade structures.
Petitioner processes and sells the dolomite that it mines
for the following products: driveway and road base rock;
concrete aggregate; utility and bedding rock; and "specialty
rock". "Specialty rock" includes rip rap, agricultural lime
(aglime), red ball diamond aggregate, and landscaping rock.
Petitioner did not sell dolomite for use as ballast during the
years at issue.
Petitioner sells driveway and road base rock, which is
available in sizes ranging from a maximum3 of 3/8" to a maximum
of 3" in diameter, for use as a base upon which a driveway or
road surface (concrete or asphalt) is laid. This product
includes dolomite fines, a powdery material created when dolomite
3 Each product size actually includes a range of rock
sizes. The maximum size within that range is used to label that
size. For example, 1-3/4" size rock may range from 3/4" to 1-
3/4"; the 3/4" size may range from 5/15" to 3/4".
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Last modified: May 25, 2011