Castle Mountain Venture (Viceroy Gold Corporation) CASTLE MOUNTAIN MINE SAN BERNARDINO COUNTY, CALIFORNIA MINE PLAN AND RECLAMATION PLAN Ver.2.1 (90M-013) California Mine ID NO. 91-36-0015 Prepared by: Castle Mountain Venture Castle Mountain Mine 911 American Pacific Drive., Ste. 190 Henderson, NV 89014 January 2, 2019 Castle Mountain Mine January 2019 Mine Plan and Reclamation Plan TABLE CONTENTS DESCRIPTION PAGE NO 1.0 SUMMARY ........................................................................................................................................ 1-1 1.1 Introduction and Background................................................................................................. 1-1 1.2 Mine Ownership and Prior Approvals .................................................................................... 1-1 1.3 Purpose and Need .................................................................................................................. 1-2 1.4 Organization of this Mine Plan/Reclamation Plan ................................................................. 1-4 1.4.1 Description – Site, Access, and Property ................................................................... 1-7 1.4.2 Background and Current Status of Operation ......................................................... 1-10 1.4.2.1 Early History – Hart Mining District ........................................................ 1-10 1.4.2.2 Operations (1990 – 2001) ....................................................................... 1-11 1.4.2.3 Operations (2001 – 2012) ....................................................................... 1-13 1.4.2.4 Operations (2012 – Present) ................................................................... 1-13 1.4.3 Permitting ................................................................................................................ 1-14 1.4.3.1 Permitting (1988 – 1990) ........................................................................ 1-14 1.4.3.2 Permitting (1995 – 1998) ........................................................................ 1-14 1.4.3.3 Permitting (Present) ................................................................................ 1-15 1.5 General Description of Approved Plan of Operations .......................................................... 1-15 1.5.1 General Permit Conditions ...................................................................................... 1-15 1.5.1.1 1998 Plan Amendments .......................................................................... 1-15 1.5.1.2 2013 Plan Amendments .......................................................................... 1-16 1.5.2 Layout of Open Pits, Overburden Sites and Heap Leach Pad Areas ........................ 1-16 1.5.3 Site Boundary .......................................................................................................... 1-23 1.5.4 Frequency of Monitoring at Piute Spring and Groundwater Elevation Monitoring ............................................................................................................... 1-23 1.5.5 Rock Staining and Placement of Cover Material ..................................................... 1-26 1.5.6 Vegetation Salvage Requirement and the Revegetation Review Committee ........ 1-26 1.6 Project Stipulations (BLM) and Conditions of Approval (County) ........................................ 1-28 2.0 MINING PLAN ................................................................................................................................... 2-1 2.1 Introduction ............................................................................................................................ 2-1 2.2 Major Mine Components ....................................................................................................... 2-4 2.3 Production Schedule .............................................................................................................. 2-6 2.4 Mine Operations ..................................................................................................................... 2-8 2.4.1 Growth Media Removal ............................................................................................ 2-8 2.4.2 Mining........................................................................................................................ 2-9 2.4.2.1 Pit Design .................................................................................................. 2-9 2.4.2.2 Operations............................................................................................... 2-12 2.4.2.2.1 Pit Characteristics .................................................................... 2-12 2.4.2.2.2 Mining Equipment ................................................................... 2-21 2.4.2.2.3 Mining Procedures .................................................................. 2-21 2.4.3 Staged Development ............................................................................................... 2-22 2.4.3.1 Stage 1 Through 5C (June 1991 to March 31, 1998) ............................... 2-26 2.4.3.1.1 General Description ................................................................ 2-26 i Castle Mountain Mine January 2019 Mine Plan and Reclamation Plan TABLE CONTENTS (cont.) DESCRIPTION PAGE NO 2.4.3.2 Stages 5A Through 5F .............................................................................. 2-26 2.4.3.2.1 General Description ................................................................ 2-26 2.4.3.2.2 Stage 5A .................................................................................. 2-27 2.4.3.2.3 Stage 5B ................................................................................... 2-27 2.4.3.2.4 Stage 5C ................................................................................... 2-27 2.4.3.2.5 Stage 5D .................................................................................. 2-27 2.4.3.2.5.1 Oro Belle, Hart Tunnel and Jumbo Pits ................ 2-32 2.4.3.2.5.2 North and South Clay Pit Reclamation Areas ...... 2-32 2.4.3.2.5.3 Other Overburden Stockpile Areas ...................... 2-32 2.4.3.2.5.4 Heap Leach Pad Area ........................................... 2-32 2.4.3.2.5.5 Mine Facilities ...................................................... 2-33 2.4.3.2.6 Stage 5E .................................................................................. 2-33 2.4.3.2.7 Stage 5F................................................................................... 2-33 2.4.3.3 Stage 6 ..................................................................................................... 2-33 2.4.3.3.1 General Description ................................................................ 2-33 2.4.3.3.2 Open Pit Mining Activities ...................................................... 2-37 2.4.3.3.3 North and South Clay Pit Reclamation Areas ......................... 2-37 2.4.3.3.4 Other Overburden Stockpile Areas ......................................... 2-44 2.4.3.3.4.1 Mine Facilities ...................................................... 2-44 2.4.3.3.4.2 Heap Leach Pad Area ........................................... 2-45 2.4.3.3.4.3 Onsite Roads (Including Overland Conveyor) ...... 2-45 2.4.3.3.5 Stage 7 Through 8 ................................................................... 2-46 2.4.3.3.6 Stage 9 .................................................................................... 2-46 2.4.4 Mine Product Characterization ............................................................................... 2-46 2.5 Ore Processing ...................................................................................................................... 2-47 2.6 Water Impoundments and Diversions ................................................................................. 2-47 2.7 Utilities and Supplies ............................................................................................................ 2-48 2.7.1 Water Requirements and Supply ............................................................................ 2-48 2.7.2 Other Utilities and Structures ................................................................................. 2-50 2.7.3 Supplies ................................................................................................................... 2-51 2.7.4 Water Containment, Treatment, and Disposal ....................................................... 2-55 3.0 RECLAMATION PLAN ........................................................................................................................ 3-1 3.1 Introduction ............................................................................................................................ 3-1 3.2 Purpose and Use of the Reclamation Plan ............................................................................. 3-1 3.3 Statutory and Regulatory Requirements ................................................................................ 3-2 3.4 Goals and Objectives of the Reclamation Plan....................................................................... 3-2 3.5 Land Use ................................................................................................................................. 3-3 3.5.1 Existing Land Use ....................................................................................................... 3-3 3.5.2 Post – Mining Land Use ............................................................................................