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way of determining how much material will be unrecoverable due to
these setbacks. We can calculate the approximate acreage taken
out of the evaluation by these setbacks:
• southern edge: 1022 feet and 25-foot setback
yields 0.59 acres;
• eastern edge: 1575 feet (1600 feet - 25 feet
already counted) and 25-foot setback yields 0.90
acres;
• northern edge: 670 feet (695 feet - 25 feet
already counted) and 10-foot setback yields 0.15
acres; and
• western edge: 1515 feet (1550 feet - 35 feet already
counted) and 10-foot setback yields 0.35 acres.
The setbacks therefore take up a total of 1.99 acres, which we
round to 2 acres.
We also have to make some assumptions about the distribution
of the deposits beneath the property, which is inherently
unknowable until mining begins. Ebanks prepared his isopach map
using the data from the four boreholes taken on the property plus
three of the boreholes on the neighboring tracts. This map
suggests that the thickest deposits are in the southwestern
corner of the parcel and the thinnest in the northwestern corner,
but without enough variation to allow one to easily calculate
different volumes for different parts of the property. Because
the adjustment for setbacks affects the entire perimeter of the
property, we find that it is reasonable to assume for these
calculations that the sand and gravel are uniformly distributed.
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Last modified: November 10, 2007