2020-04-21_REVISION - C1981010

• Permit No: C1981010
• IBM Index Class Name: Revision
• Doc Date: 4/21/2020
• Doc Name: Correspondence
• From: Trapper Mining Inc
• To: DRMS
• Type & Sequence: TR124
• Email Name: JLE
• Email Name: RAR
• Media Type: D
• Archive: No

April21, 2020
Page i
NIGHTHAWK STRIKE PIT
SPOILS PILE GEOTECHNICAL EVALUATION,
TRAPPER MINE
TABLE OF CONTENTS
Page
INTRODUCTION.......................................................................................................................1
Development of Spoil Properties.....................................................................................1
Global Stability Analysis Using Numerical Modeling......................................................4
Conclusions and Recommendations...............................................................................11
LIST OF TABLES
Table 1. Summary Numerical Model Input Parameters............................................................4
LIST OF FIGURES
Figure 1.
Location of Proposed N-Strike Pit Spoil Pile..............................................................2
Figure 2.
Three -Dimensional Numerical Model Geometry of Spoil Pile (plan view) .................
5
Figure 3a.
Displacement Plot for the Spoil Pile Numerical Model (plan view)............................7
Figure 3b.
Material Velocity Plot for the Spoil Pile Numerical Model (plan view) ......................
8
Figure 3c.
Yield Condition Plot for the Spoil Pile Numerical Model (plan view) ........................9
Figure 4.
Global Slope Stability Plot.......................................................................................10
Agapito Associates, Inc.