2011-08-31_REVISION - M1977215

• Permit No: M1977215
• IBM Index Class Name: REVISION
• Doc Date: 8/31/2011
• Doc Name: Technical Revision TR-18
• From: Rio Grande Silver, Inc.
• To: DRMS
• Type & Sequence: TR18
• Email Name: RCO
• Email Name: SSS
• Email Name: DMC
• Media Type: D
• Archive: No

TABLE OF CONTENTS
1.0 INTRODUCTION 4
2.0 EXISTING CONDITIONS 5
3.0 PROPOSED ACTIONS
UNDERGROUND EXPLORATION DEVELOPMENT ACTIVITIES 6
3.1 NEWDECLINE 6
3.2 PORTAL FACE -UP AND BENCH CONSTRUCTION 7
3.3 DECLINE EXCAVATION 7
3.4 VENTILATION /ESCAPE RAISE REHABILITATION 8
3.5 UNDERGROUND EXPLORATION WORK 8
4.0 EXPLORATION DEVELOPMENT ROCK HANDLING AND STORAGE 9
5.0 GROUNDWATER HANDLING 12
6.0 SURFACE FACILITIES 13
6.1 PORTAL AREA FACILITIES 13
6.2 PROJECT ADMINISTRATION AND SUPPORT FACILITIES 14
7.0 WORK FORCE 16
8.0 EQUIPMENT 17
9.0 MATERIALS AND SUPPLIES 17
10.0 RECLAMATION 19
11.0 ENVIRONMENTAL MANAGEMENT AND MITIGATION 20
11.1 AIR QUALITY 20
11.2 CULTURAL AND HISTORIC RESOURCES 21
11.3 EROSION AND SEDIMENT CONTROLMEASURES 21
11.4 HEALTH AND SAFETY 21
11.5 NOISE 22
11.6 RECREATION 22
11.7 ROAD CONSTRUCTION 22
11.8 TRASH AND OTHERWASTEMATERIAL 22
11.9 VISUAL RESOURCES AND LIGHTING 23
11.10 SOILS 23
11.11 VEGETATION 23
11.12 WILDLIFE 24
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