PERMFILE73119

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: GEOLOGICAL MAPPING YOAST MINE ROUTT CNTY COLO BY AMUEDO & IVEY INC
• Section_Exhibit Name: TAB 13 ATTACHMENT 13-6
• Media Type: D
• Archive: No

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TABLE OF CONTENTS
1.0 INTRODUCTION
Paae No.
1
1.1 Description of the Area 1
1.2 Purpose and Scope 1
1.3 Mapping Methods 3
1.4 Field Work 4
1.5 Post-Field Conference 4
2.0 SUMMARY AND CONCLUSIONS 5
2.1 Summary 5
2.2 Conclusions 7
2.2.1 General Conclusions 7
2.2.2 Conclusions Regarding
Haul Roads 8
2.2.3 Conclusions Regarding
Sedimentation Pond 010 8
2.2.4 Conclusions Regarding
Topsoil Stockpile Areas 9
3.0 GENERAL GEOLOGY 10
3.1 Rock Units 10
3.1.1 Iles Formation 10
3.1.2 Williams Fork Formation 11
3.1.3 Lewis Shale 12
3.2 Surficial Units 13
3.2.1 Alluvium 13
3.2.2 Colluvium 13
3.3 Geologic Structure 14
3.4 Hydrology 16
4.0 ENGINEERING GEOLOGY 18
4.1 Haul Road A 18
4.2 Haul Road B 22
4.3 Sedimentation Pond (010) 26
4.4 Topsoil Stockpile Areas 27
4.4.1 Stockpile Area A 28
4.4.2 Stockpile Area B 29
4.4.3 Stockpile Area C 30
4.4.4 Stockpile Area D 30
4.4.5 Stockpile Area E 31
4.4.6 Stockpile Area F 32
4.4.7 Stockpile Area G 32
4.4.8 Stockpile Area H 33