2010-12-17_REVISION - C1981019 ‎(115)‎

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 12/17/2010
• Doc Name: Exhibit 6 Item 7 Geology Pre-Feasibility Part 3
• Type & Sequence: PR3
• Media Type: D
• Archive: No

o Repeat modeling process until satisfied with the results
0
Modelina Parameters for Colowvo StratModel
Modeling Parameter
Value
Schema
Schema_colow o
StratModel table
Schema_colow o
StratModel grid
Schema _colow o
Topographic Surface
To o_ m_bi
Thickness Interpolator
Height
Surface Interpolator
Height
Trend Interpolator
Height
Minimum modeled thickness
0.25 feet
Drill Hole Design File
Dholes.d n
Limit polygon design file
Limits_tot.d n
Mine Survey design file
Minesurve .d n
Final grid cell size
100 feet
Northern Model Extent
373,900
Southern Model Extent
3197,00
Western Model Extent
1,302,500
Eastern Model Extent
1,370,100
Outline of Coal Quality Modeling
• • Ensure the current coal quality model type is set to: DRY
• Export data files from DHDB
• Edit query "export_prox_04_prt3" to output latest quality data
■ See "Quality Export Notes" below.
• Export to comma delimited CSV or text file.
• Output file should contain:
■ Dhid, easting, northing, seam, sample no, sample type, sample
top elev, sample base elev, from depth, to depth, total
moisture, equilibrium moisture, dry ash, dry sulfur, dry btu,
ASG, AFT.
• Create backup copy of "raw_qual.tab" table
• Import latest quality data into "raw_qual.tab" table
o Append new data to existing data
• Check the "Waste" column of the "raw_qual.tb" table
• Samples with a waste value of 0.0 reside wholly within a seam.
• Samples with a waste value of 1.0 reside wholly outside a seam.
• Samples with a waste value between 0.0 and 1.0 straddle a seam.
The depth of these samples should be checked against the lithology for
that hole.
• Create backup copy of "comp_qual.tab" table
• Update (overwrite) "comp_qual.tab" composite table from StratModel table
and "raw_qual.tab" data
o Composite over "Intervals" in MineScape
■ See "MineScape Quality Composite Method"
o Input Model Type must be set to table.
• Rename "quality.grd" to "quality_ <date >.grd ", where <date> is the date of
the previous quality grid file.
• Create a new grid file called "quality.grd"
o Use grid specification: "full_cgmodel_200"