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Junucrry 15, 2008 Ptige i <br />? t <br />TRAPPI-:R G-PIT LANDSLIDE MINING AR SS1?i%1iF <br />DEI, 'i U .?008 <br />TABLE OF CONTENTS pivisw„ _ .4mation, <br />Mining and Safety <br />1.0 INTRODI CTION <br />2.0 LABORATORY TESTING ............................................................................................6 <br />3.0 ROCK MASS CHARACTERIZATION .........................................................................9 <br />4.0 SPOIL STABILITY ANALYSIS ................................................................................. 22 <br />4.1 Calibration of Spoil Strengths ............................................ ...............................22 <br />4.2 K-Pit T & S Spoil Pile Model .............................................. ..............................27 <br /> 4.2.1 Assumptions and Limitations ................................... ..............................27 <br /> 4.2.2 Methodology .......................................................... ...............................27 <br /> 4.2.3 (ieometr) . ................................................................ ...............................28 <br /> 4.2.4 Material Properties ................................................. ...............................28 <br /> <br />.............................................. <br />4.2.5 Boundary Conditions 29 <br />................................. <br />4.3 <br />............................. <br />Analysis Sequence and Cases Analyzed 29 <br />................................. <br />4.4 Analysis Results ................................................................. ...............................30 <br />4.5 Spoil Pile Reeommcndations .............................................. ...............................32 <br />5.0 GEOTECIINICAI. ISSUES FOR MINING: K-PIT AND G-Pri ..................................36 <br />5.1 Failure Mechanisms ................................................................................ ..........36 <br />5.2 Understanding ofMine Plan .................................................................... ..........45 <br /> 5.2.1 Z-Dip Pit Mining Plan ................................................................. ..........45 <br /> 5.2.2 A-Pit Ilighwall Mining And Dragline Dip-Pit Mining Plan .......... ..........48 <br /> 5.2.3 K-Pit And G-Pit Mining Plan ....................................................... ..........50 <br />5.3 Reserve Recovery Estimates .................................................................. ...........52 <br />5.4 Truck K Shovel Cut Face Stability and Monitoring ................................. ..........54 <br />5.5 Drazline Cut Face Stability and Monitoring ........................................... ...........56 <br />5.6 Ground\catcr I.xU'action and Monitorim . ................................................ ...........57 <br />6.0 SUNINIARY ..................................................................................................................60 <br />APPENDI\-LABORATORY TESTING RESULTS ..........................................................A-1 <br />Agapito Associates. Inc.