waste and overburden management plan, phase iv development ... ??minto explorations ltd. waste rock...

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  • E

    MINTO EXPLORATIONS LTD.

    WASTE ROCK AND OVERBURDEN MANAGEMENT PLANPHASE IV DEVELOPMENT

    MINTO MINE, YT

    REPORT

    SEPTEMBER 9, 2011ISSUED FOR USE

    BA FILE: W14101068.015

  • EBA, A Tetra Tech CompanyCalcite Business Centre, Unit 6, 151 Industrial Road

    Whitehorse, YT Y1A 2V3 CANADAp. 867.668.3068 f. 867.668.4349

    LIMITATIONS OF REPORT

    This report and its contents are intended for the sole use of Minto Explorations Ltd. and their agents. EBA, A Tetra Tech

    Company, does not accept any responsibility for the accuracy of any of the data, the analysis, or the recommendations

    contained or referenced in the report when the report is used or relied upon by any Party other than Minto Explorations Ltd., or

    for any Project other than the proposed development at the subject site. Any such unauthorized use of this report is at the

    sole risk of the user. Use of this report is subject to the terms and conditions stated in EBAs Services Agreement. EBAs

    General Conditions are provided in Appendix A of this report.

  • WASTE MANAGEMENT PLAN PHASE IV DEVELOPMENT

    EBA FILE: W14101068.015 | SEPTEMBER 9, 2011 | ISSUED FOR USE

    i

    Waste and Overburden Management Plan, Phase IV Development Report - IFU.docx

    TABLE OF CONTENTS

    1.0 INTRODUCTION................................................................................................................................. 1

    2.0 PROPERTY DESCRIPTION AND BACKGROUND INFORMATION........................................ 1

    2.1 General Location and Access .......................................................................................................... 1

    2.2 Topography and Vegetation............................................................................................................. 1

    2.3 Permafrost....................................................................................................................................... 2

    2.4 Regional Geology ............................................................................................................................ 2

    2.5 Climate............................................................................................................................................ 3

    2.5.1 Temperature ....................................................................................................................... 3

    2.5.2 Wind ................................................................................................................................... 3

    2.5.3 Precipitation ........................................................................................................................ 4

    2.5.4 Solar Radiation.................................................................................................................... 4

    2.6 Status.............................................................................................................................................. 4

    2.7 History ............................................................................................................................................. 4

    3.0 OBJECTIVES OF THE WASTE ROCK AND OVERBURDEN MANAGEMENT PLAN .......... 5

    4.0 WASTE CHARATERISTICS AND SEGREGATION...................................................................... 5

    4.1 Types of Waste................................................................................................................................ 5

    4.2 Waste Characteristics ...................................................................................................................... 5

    4.2.1 Overburden......................................................................................................................... 5

    4.2.2 Waste Rock......................................................................................................................... 6

    4.3 Waste Segregation Protocol............................................................................................................. 6

    5.0 WASTE RELEASE AND DISPOSAL SCHEDULE.......................................................................... 8

    5.1 Waste Volumes ............................................................................................................................... 8

    5.2 Waste Disposal Schedule ................................................................................................................ 9

    6.0 WASTE DUMP DESIGN ...................................................................................................................10

    6.1 General Design Criteria.................................................................................................................. 10

    6.2 Closure Considerations.................................................................................................................. 12

    6.3 Surface Drainage Considerations................................................................................................... 12

    6.4 Mill Valley Fill Expansion................................................................................................................ 12

    6.4.1 Design Considerations ...................................................................................................... 12

    6.4.2 Design Details................................................................................................................... 13

    6.4.3 Closure Plan ..................................................................................................................... 14

    6.5 Southwest Waste Dump Expansion ............................................................................................... 15

    6.5.1 General Description of Waste Disposal.............................................................................. 15

    6.5.2 Design Considerations ...................................................................................................... 16

    6.5.3 Design Details................................................................................................................... 16

    6.5.4 Closure Plan ..................................................................................................................... 17

    6.6 Area 1 South Wall Buttress ............................................................................................................ 17

  • WASTE MANAGEMENT PLAN PHASE IV DEVELOPMENT

    EBA FILE: W14101068.015 | SEPTEMBER 9, 2011 | ISSUED FOR USE

    ii

    Waste and Overburden Management Plan, Phase IV Development Report - IFU.docx

    6.6.1 Design .............................................................................................................................. 17

    6.6.2 Buttress Construction ........................................................................................................ 17

    6.6.3 Closure Plan ..................................................................................................................... 18

    6.7 Reclamation Material Stockpiles .................................................................................................... 18

    6.7.1 Design Considerations ...................................................................................................... 18

    6.7.2 Design Details................................................................................................................... 18

    6.7.3 Closure Plan ..................................................................................................................... 19

    7.0 GENERAL RECOMMENDATIONS FOR CONSTRUCTION.....................................................19

    7.1 Site Preparation During Waste Disposal......................................................................................... 19

    7.2 Reclamation of Overburden Waste................................................................................................. 19

    8.0 MONITORING PROGRAM...............................................................................................................19

    9.0 CLOSURE.............................................................................................................................................20

    REFERENCES ................................................................................................................................................21

    FIGURES

    Figure WMP-01 Overall Site Plan - Waste Storage Components

    Figure WMP-02 Overburden Release from Phase IV Mine Expansion

    Figure WMP-03 Waste Rock Release from Phase IV Mine Expansion

    Figure WMP-04 Waste Flow Charts

    Figure WMP-05 Site Plan - Mill Valley Fill Expansion

    Figure WMP-06 Sections - Mill Valley Fill Expansion

    Figure WMP-07 Site Plan - Southwest Waste Dump Expansion

    Figure WMP-08 Section - Southwest Waste Dump Expansion

    Figure WMP-09 Area 1 Open Pit South Wall Buttress Plan and Profile

    Figure WMP-10 Site Plan Mill Valley and Airport Reclamation Stockpiles

    Figure WMP-11 Sections Mill Valley and Airport Reclamation Material Stockpiles

    APPENDICES

    Appendix A General Conditions

  • WASTE MANAGEMENT PLAN PHASE IV DEVELOPMENT

    EBA FILE: W14101068.015 | SEPTEMBER 9, 2011 | ISSUED FOR USE

    1

    Waste and Overburden Management Plan, Phase IV Development Report - IFU.docx

    1.0 INTRODUCTION

    Minto Explorations Ltd. (Minto) is proposing the Phase IV Mine Expansion at the Minto Mine site, located

    north of Carmacks, YT. According to Mintos Project Proposal (Reference 1), the Phas

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