2010-12-17_REVISION - C1981019 ‎(116)‎

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 12/17/2010
• Doc Name: Exhibit 6 Item 8 Addendum to Pre-Feasibility Report
• Type & Sequence: PR3
• Media Type: D
• Archive: No

Addendum to the Collom Area Geology Pre - Feasibility Report
• HGC exported the updated drill hole data from the database and re- imported
the data into MineScape.
4.2 Geological Modeling
HGC prepared suites of burn line /coal extent maps using the latest drill hole
data. The Colowyo Exploration Team reviewed these maps in conjunction
with aerial imagery, field notes and drill logs. The Colowyo Exploration Team
revised the burn lines for each seam as needed on the maps. HGC then
updated the burn extent lines to reflect changes outlined by the Colowyo
Exploration Team.
HGC regenerated the Colowyo geological reserve model using the StratModel
application in MineScape. The StratModel schema used to build the model
was called "schema_colowyo ". HGC generated the final geological model
using a grid cell size of 100 -feet. Table 4.1 presents the extent of the entire
• Colowyo model.
Table 4.2 presents the coordinates defining the Collom Mine Area used for mapping and
exporting geological surface to SurvCADD.
Table 4.1
Geologic Model Extent Coordinates
Eastern Limit:
1,370,100
Western Limit:
1,302,500
Northern Limit:
373,900
Southern Limit:
319,700
Table 4.2 presents the coordinates defining the Collom Mine Area used for mapping and
exporting geological surface to SurvCADD.
September 2006 Page 10 of 25
Table 4.2
Collom Mine Area Subset Coordinates
Eastern Limit:
1,338,000
Western Limit:
1,318,000
Northern Limit:
357,000
Southern Limit:
334,000
September 2006 Page 10 of 25