2014-03-03_REVISION - M1988112

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 3/3/2014
• Doc Name: Detailed inspection report TR33
• From: Battle Mountain Resources, Inc.
• To: DRMS
• Type & Sequence: TR33
• Email Name: WHE
• Media Type: D
• Archive: No

TABLE OF CONTENTS
1.0 PROJECT DESCRIPTION .................................................................... ..............................1
1.1 Project Background .................................................................... ..............................1
1.2 Tailing Facility Design and Construction .................................. ..............................2
1.3 Tailing Facility Operation .......................................................... ..............................4
1.4 Existing Instrumentation and Monitoring Program ................... ..............................4
2.0 INITIAL INSPECTION OBSERVATIONS ......................................... ..............................6
2.1 Operational Status During Inspection ........................................ ..............................6
3.0 STRUCTURAL STABILITY ................................................................ ..............................7
!_ 3.1 Summary of Existing Data and Analysis ................................... ..............................7
_ 3.1.1 Embankment Design ...................................................... ..............................7
3.1.2 Results of Previous Studies ............................................ ..............................8
3.1.3 Monitoring Data ............................................................ .............................10
3.2 Visual Assessment of Dam Stability ......................................... .............................10
_ 3.2.1 Slumps, Cracking and Settlement ................................. .............................11
-' 3.2.2 Erosion Gulley in Right Abutment Groin ..................... .............................12
3.2.3 Drain Outlets ................................................................. .............................14
3.2.4 Piezometers ................................................................... .............................16
3.3 Results of New Evaluations Performed as part of Detailed
Inspection
Analysis..................................................................................... .............................16
3.3.1 Steady Seepage Analyses .............................................. .............................16
3.3.2 Static Stability ............................................................... .............................18
3.3.3 Stability under Flood Loading ...................................... .............................18
3.3.4 Stability under Earthquake Loading ............................. .............................20
4.0 HYDROLOGY/HYDRAULICS .......................................................... .............................22
4.1 Summary of Existing Data and Analysis .................................. .............................22
4. 1.1 Impoundment Elevation- Area - Volume ........................ .............................22
4.1.2 Drainage Area and Runoff Conditions ......................... .............................24
4.1.3 Existing Hydrologic /Hydraulic Design Data ................ .............................24
4.1.4 Previous Design Analyses ............................................. .............................25
San Luis Project Miller Geotechnical Consultants
Tailing Dam Data Report ii
February 2014