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2009-09-21_REVISION - C1981010
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2009-09-21_REVISION - C1981010
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Last modified
8/24/2016 3:55:41 PM
Creation date
9/22/2009 2:03:23 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
REVISION
Doc Date
9/21/2009
Doc Name
Proposed Decision and Findings
From
DRMS
To
Trapper Mining, Inc
Type & Sequence
PR6
Email Name
JDM
Media Type
D
Archive
No
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Cut 1. Each cut is further divided into mining horizons. The horizons were developed for a <br />loader with an assumed maximum digging depth of 30 feet, which is the maximum horizon <br />height. <br />Removal of Topsoil and Overburden <br />Prior to disturbance, and in advance of the pits, brush is cleared and topsoil is removed and <br />salvaged. Topsoil is stockpiled only if a live-haul replacement area is not available in the area. <br />If stockpiled, piles are shaped and seeded to establish vegetation for protection from wind and <br />water erosion. After topsoil removal, the overburden is drilled and blasted in advance of the pit. <br />Overburden is then stripped by draglines, scrapers, truck/loader or bulldozers. Finally, front-end <br />loaders load coal into 90-ton haul trucks, which deliver the raw coal to the Craig Power Plant. <br />Trapper proposes in PR-06 to remove approximately 29.3 million cubic yards of overburden <br />spoil material in the K-Pit and to place the material in two proposed permanent fills that will be <br />known as the K-Pit Buttress Fill and the Horse Gulch Fill. Much of this overburden is located <br />within the landslide that occurred in K-Pit in October 2006. Trapper will place the first 4.7 <br />million cubic yards of material at the K-Pit Buttress Fill, which will serve as a buttress against <br />further movement of the slide area. Upon completion of the K-Pit Buttress Fill, the remaining <br />24.6 million cubic yards of material will be hauled and placed in the Horse Gulch Fill. The only <br />portion of Trapper's operation that will be located downslope from the Horse Gulch Fill will be <br />Trapper's Horse Gulch sediment control pond. An underdrain will be constructed beneath the <br />Horse Gulch Fill. <br />Trapper Mine 16 September 21, 2009
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