Last Updated：2025/12/30
Sentence
Estimates
of
coal
which
can
be
strip
mined
should
not
be
interpreted
to
mean
that
this
coal
can
only
be
strip
mined.
Strip
mining
began
as
a
process
of
recovering
coal
which
was
located
quite
near
the
surface
of
the
earth
or
at
the
"outcrop"
on
a
hillside.
But
now
it
is
common
to
strip
mine
coal
which
is
buried
beneath
80
to
150
feet
or
more
of
rock,
quite
enough
rock
to
support
the
roof
of
an
underground
mine.
Quizzes for review
Estimates of coal which can be strip mined should not be interpreted to mean that this coal can only be strip mined. Strip mining began as a process of recovering coal which was located quite near the surface of the earth or at the outcrop
on a hillside. But now it is common to strip mine coal which is buried beneath 80 to 150 feet or more of rock, quite enough rock to support the roof of an underground mine.
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