2021-07-14_REVISION - M2012032 ‎(4)‎

• Permit No: M2012032
• IBM Index Class Name: REVISION
• Doc Date: 7/14/2021
• Doc Name Note: II of II
• Doc Name: Adequacy Review Response
• From: Ouray Silver Mines
• To: DRMS
• Type & Sequence: TR15
• Email Name: LJW
• Media Type: D
• Archive: No

FLSmidth USA, Inc.
7158 S FLSmidth Drive • Midvale• UT 84047-5559 • USA M ' D T H
Table of Contents
1.0 Executive Summary .......................................................................................1
1.1 Thickening .................................................................................................1
1.2 Filter Press Testing......................................................................................1
Tableof Contents....................................................................................................2
Listof Figures.........................................................................................................2
Listof Tables..........................................................................................................3
RevisionLog ...........................................................................................................3
2.0 Introduction ..................................................................................................4
3.0 Equipment and Testing Methods ......................................................................4
3.1 Sample Characterization ..............................................................................4
3.2 Flocculent Screening and Flux Testing ...........................................................4
3.3 2-Liter Thickener Static Simulation Tests .......................................................5
3.4 Continuous Fill Deep Tube Thickener Tests.....................................................5
3.5 Mud Rheology.............................................................................................7
3.6 Pressure Filtration - Filter Press....................................................................8
4.0 Received Samples........................................................................................ 10
5.0 Thickening Results ....................................................................................... 10
5.1 Flocculent Screening .................................................................................10
5.2 Flux Testing ............................................................................................. 11
5.3 2-L Static Testing...................................................................................... 12
5.4 Continuous Fill Deep Tube Test................................................................... 12
5.5 Underflow Rheology .................................................................................. 15
6.0 Filter Press Testing Results............................................................................ 16
7.0 Conclusions and Recommendations................................................................21
7.1 Thickening Results ....................................................................................21
7.2 Filter Press Results....................................................................................21
AppendixGuide.....................................................................................................22
Appendix A - Proprietary and Confidential Information ..............................................i
Appendix B - Disclaimer and Copyright Information .................................................ii
Appendix C - Particle Size Analysis ....................................................................... iii
Appendix D - 2-1- Static Test Results ..................................................................... iv
Appendix E - Filtration Graphs...............................................................................v
List of Figures
Figure 1: FLSmidth Testing Setup - Continuous Fill Test ..............................................7
Figure 2: Haake VT550 Vane Viscometer with Custom Vane .........................................8
Figure 3: FLSmidth Testing Setup - Filter Press ..........................................................9
Figure 4: Flocculent Screening ................................................................................ 11
Figure5: Flux Testing............................................................................................ 12
Figure 6: CF Test - U/F Bed Compaction vs. Time Results ......................................... 13
Figure 7: Continuous Fill Test - Dynamic Fill............................................................. 15
Figure 8: Continuous Fill Test - Dynamic Fill - Incoming Feed (L), Bed Development (R)15
Figure 9: Underflow Rheology Results...................................................................... 16
Figure 10: Volume per Filter Area & Feed Pressure vs. Time: Test 1 - 50-mm Cake ...... 17
Figure 11: Cake Moisture vs. Air Blow Time - All Tests .............................................. 18
Figure 12: Filtration Rate vs. Cake Moisture - All Tests.............................................. 19
Figure 13: Generated Filter Cake: Test 1 - 50-mm Cake............................................ 19
Figure 14: Generated Filter Cake: Test 4 - 32-mm Cake............................................20
Figure 15: Clean Cake Discharge & Filter Media - 18-oz. Felt......................................20
Figure 16: Particle Size Analysis Report .................................................................... iii
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