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Re: A21 Construction Environmental Management Plan Version 3.0

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Re: A21 Construction Environmental Management Plan Version 3.0 Diavik Diamond Mines (2012) Inc. P.O. Box 2498 Suite 300, 5201 – 50th Avenue Yellowknife, NT X1A 2P8 Canada T (867) 669 6500 F (867) 669 9058 Ms. Violet Camsell-Blondin Chair Wek’èezhíi Land and Water Board Box 32 Wekweeti, NT X0E 1W0 31 December 2014 Re: A21 Construction Environmental Management Plan Version 3.0 On October 15, 2012 the Wek’èezhíi Land and Water Board approved or accepted all of the submission from Diavik Diamond Mines (2012) Inc. (DDMI) in relation to the construction of the A21 dike to allow open-pit mining of the A21 kimberlite pipe. Dike construction was subsequently delayed. We will commence the in-lake components of dike construction in July 2015. Crushing for construction material and road/laydown development has begun. Attached for your approval is an updated A21 Construction Environmental Management Plan (CEMP) that includes both the Dewatering Management Plan (Part E, Item 2) and the Dredging Management Plan (Part C, Item 6). Regards, Gord Macdonald cc Ryan Fequet (WLWB) Brett Wheler Attached: A21 Construction Environmental Management Plan – Version 3.0. Diavik Diamond Mines (2012) Inc. PO Box 2498, Suite 300,5201-50th Avenue, Yellowknife, NT, X1A 2P8, Canada Registered in Canada A21 DIKE: CONSTRUCTION ENVIRONMENTAL MANAGEMENT PLAN: 2014 UPDATE Version 3.0 Prepared by Diavik Diamond Mines (2012) Inc. Yellowknife, Northwest Territories 31 December 2014 Document# : CSLR-002-0513 R3 Diavik Diamond Mines (2012) Inc. A21 Dike: 2014 Update Construction Environmental Management Plan 31 December 2014 INSTRUCTION TO DOCUMENT CONTROL X Entire document revised. Reissue all pages. Reissue revised pages only. STAMP THE SPECIFICATION AS FOLLOWS: Issued for comments. Issued for approval. X Issued for regulatory submissions Issued for construction. SPECIFICATION REVISION INDEX No. Prepared Checked By Project Client Pages Remarks By Date Manager Approved Revised Date Date Date B. Hulsman T. Martin T. Martin Issued for regulatory 0 Aug/07 All Aug/07 Aug/07 Aug/07 applications for A21 N. Ekman T. Martin K. Halisheff Issued for regulatory 1 Jul/12 All Jul/12 Jul/12 Ju/12 applications for A21 2,3, G. 32,33,40,41, Issued for regulatory 2 Macdonald June 2013 63, applications for A21 Jun/13 64,71,72,73,76 G. Issued for regulatory 3 Macdonald Dec 2014 All applications for A21 Dec/14 Summary of Changes for Revision 3: • Revised construction schedule. • Cut-off wall construction method. • Two open-water seasons of foundation preparation and embankment placement. • DDMI as general contractor. Diavik Diamond Mines (2012) Inc. A21 Dike: 2014 Update Construction Environmental Management Plan 31 December 2014 TABLE OF CONTENTS Page 1.0 INTRODUCTION .................................................................................................................. 1 1.1 Objective ..................................................................................................................... 1 1.2 Definition of Best Management Practices ................................................................... 3 2.0 BACKGROUND AND ASSUMPTIONS ................................................................................ 4 2.1 Physical Setting ........................................................................................................... 4 2.1.1 Location and Terrain ........................................................................................ 4 2.1.2 Climate ............................................................................................................ 4 2.1.3 Lake currents ................................................................................................... 4 2.1.4 Lakebed ........................................................................................................... 4 2.1.5 Sediment Settling ............................................................................................ 5 2.1.6 Sediment Settling Implications ........................................................................ 6 2.1.7 Constraints ...................................................................................................... 6 3.0 OVERVIEW OF CONSTRUCTION SCOPE AND SCHEDULE ........................................... 8 4.0 CONSTRUCTION PHASE ORGANIZATION AND RESPONSIBILITIES .......................... 10 4.1 Introduction ................................................................................................................ 10 4.2 Overall Project Organization ..................................................................................... 10 4.3 Responsibilities ......................................................................................................... 12 4.3.1 DDMI ............................................................................................................. 12 4.3.2 BGC/DDMI ..................................................................................................... 12 4.3.3 Specialist Contractor/DDMI ........................................................................... 13 5.0 CRUSHING FACILITIES .................................................................................................... 14 5.1 Crushing and Screening Operations ......................................................................... 14 5.2 Production and Schedule .......................................................................................... 16 5.3 Equipment ................................................................................................................. 16 5.4 Stockpiling ................................................................................................................. 16 5.5 Quality Control ........................................................................................................... 17 5.6 Reporting ................................................................................................................... 18 5.7 Engineering and Gradation Specifications ................................................................ 18 6.0 BATCH PLANT .................................................................................................................. 20 7.0 TURBIDITY BARRIERS ..................................................................................................... 21 7.1 Overview ................................................................................................................... 21 7.1.1 Design and installation .................................................................................. 21 7.2 Deployment ............................................................................................................... 25 7.2.1 Installation of End Anchors on Islands, Bottom Anchors and Buoys ............. 25 7.2.2 Turbidity Barrier Installation and Removal ..................................................... 25 7.2.3 Control ........................................................................................................... 26 7.2.4 Contingencies ................................................................................................ 26 8.0 FOUNDATION PREPARATION ......................................................................................... 27 Document #: CLSR-002-0513-R3 Page i Diavik Diamond Mines (2012) Inc. A21 Dike: 2014 Update Construction Environmental Management Plan 31 December 2014 TABLE OF CONTENTS Page 8.1 Introduction ................................................................................................................ 27 8.2 Conventional excavation ........................................................................................... 27 8.2.1 Overview ........................................................................................................ 27 8.2.2 Equipment ..................................................................................................... 28 8.2.3 Operating Procedures ................................................................................... 28 8.2.4 Controls ......................................................................................................... 29 8.2.5 Contingencies ................................................................................................ 29 8.3 Hydraulic Dredging .................................................................................................... 29 8.3.1 Overview ........................................................................................................ 29 8.3.2 Installation ..................................................................................................... 29 8.3.3 Operating Procedures ................................................................................... 32 8.3.4 Controls ......................................................................................................... 35 8.3.5 Contingencies ................................................................................................ 35 8.4 Environmental issues ................................................................................................ 36 8.5 Management Measures ............................................................................................. 37 8.5.1 Monitoring and Controls ................................................................................ 38 Drainage and Piping .................................................................................................. 38 8.6 38 9.0 A21 DIKE EMBANKMENT PLACEMENT .........................................................................
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