Amerikohl Mining, Inc. typically uses a method of mining called the
Modified Block Cut method.
This method of mining is one of the least disturbing to the environment.
The following seven steps illustrate the procedures of this method.
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The land is cleared from surface debris and rock so that any
and all top soil can be removed and stockpiled for final site
reclamation. This ensures successful post-mining vegetation and
growth. |
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Consolidated
rock layers must be broken with the use of explosives so the
mining equipment can mine the layers of overburden. The benched
area is drilled using down-hole rotary drill rigs. The holes
are then partially filled with approved explosive materials
and detonated or "shot."
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Overburden
removal is accomplished using large bulldozers, front-end loaders
and rock trucks. The bulldozers typically remove the top two-thirds
of the overburden by pushing or "slot dozing" the overburden
into the previous block cut. The front end loader then loads
the remaining one-third of overburden lying directly above
the coal seam onto the rock trucks, which transport overburden
away from the open cut area and "back dump" towards the bulldozers.
This allows for continuous, concurrent reclamation.
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Once the
pit area is cleaned from rock and debris, a front end loader
with a straight edge attached to the bucket is used to clean
the coal. The coal is then loaded in to trucks using a Gradall,
excavator or front-end loader. This process must be carefully
executed to ensure that the coal is loaded as cleanly as possible.
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To ensure
that any water emanating from the final reclaimed area is clean
and free from impurities, Amerikohl prides itself in its special
handling and alkaline addition practices. Once all coal is
loaded from the pit area , the coal waste is cleaned from the
pit floor and placed high in the backfill area away from any
contact with water. Limestone quarry dust, rec-mix or other
alkaline materialis then placed over the entire pit floor,
thus creating an alkaline pit environment.
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Concurrent
backfilling, a trademark of Amerikohl's mine sites is accomplished
as part of the normal mining practice of modified block cut
mining. Rough backfilling is always within 300 feet of the
active open cut mining area. Concurrent backfilling allows
for continuous seasonal reclamation and revegetation, which
in turn can aid in the prevention of acid mine drainage. |
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