Mine Dewatering and Water Management at Barrick Goldstrike Mine in the Carlin Trend, Nevada Johnny Zhan, Ph.D.
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1 Mine Dewatering and Water Management at Barrick Goldstrike Mine in the Carlin Trend, Nevada Johnny Zhan, Ph.D. Presented at U.S. EPA Hardrock Mining Conference 2012 Denver, CO, USA, April 3-5, 2012
2 Presentation Contents 1. Introduction to Barrick and Goldstrike 2. Goldstrike Dewatering System 3. Goldstrike Monitoring System 4. Impact Evaluation 5. Conclusions 2
3 Unit Conversion Distance: 1 meter = 3.3 feet Flow rate: 1 liters/second = 16 gallons/minute (gpm) Weight (Gold): 1 tonne = 32,000 troy ounces April 3-5, 2012 U.S. EPA Hardrock Mining Conference
4 1. Introduction Barrick Donlin Creek Goldstrike Turquoise Ridge Marigold Bald Mountain Cortez Ruby Hill Round Mountain Lagunas Norte Pierina North America Zaldívar Cerro Casale Pascua-Lama Golden Sunlight South America Veladero Hemlo Pueblo Viejo African Barrick North Mara Kabanga Tulawaka Bulyanhulu Buzwagi Jabal Sayid Lumwana Reko Diq Australia Pacific Porgera Plutonic Darlot Lawlers Granny Smith Kanowna Cowal Kalgoorlie Mine Project 4
5 Barrick Global Operations Equinox Addition Jabal Sayid SAUDI ARABIA P A P U A N E W G U I N E A Porgera Lumwana ZAMBIA A U S T R A L I A Plutonic Lawlers Darlot Granny Smith Kanowna Kalgoorlie Cowal U.S. EPA Hardrock Mining April 3-5, 2012 Mines 5 Conference 2012 Projects
6 1. Introduction Goldstrike Mine April 3-5, 2012 U.S. EPA Hardrock Mining Conference
7 Open Pit 3,700 m 2,000 m 400 m 7
8 Underground Mines Pre-mining water table 1600 m amsl Current water table 1100 m amsl with a drawdown of 500 m 8
9 2. Goldstrike Dewatering System 9
10 Dewatering System - Active Pumping well - Depth: 1000 m Diameter: 50 cm Rate: 200 l/s (3,000 gpm) Power: 2,000 HP Cost: US$3 Million/Each 10
11 Dewatering System - Active Piezometer Regional Well Local Well 11
12 Dewatering System - Passive 12
13 Dewatering System - Passive HD ( ) Numbers: 1800 Length: m Total Length: 380 km 13
14 Water Management System 560,000 m 2 /Each 14
15 Cumulative Water Balance 6% 5% 10% 27% 52% Mine Use Irrigation Infiltration/Injection Discharge to Humboldt River Flood Irrigation and Evap 15
16 3. Goldstrike Monitoring System 15,000 km 2 Manual/Automatic Groundwater Monitoring Manual/Automatic Surface Water Monitoring 16
17 Water Level Change To-Date Drawdown Mounding 17
18 New Tools Ground Deformation A New Assessment Tool - Interferometric Synthetic Aperture Radar (InSAR) Identified Subsidence/Uplift Associated with Mine Dewatering 100km x 100km coverage at 5m pixel resolution From Massonnet,
19 Ground Deformation InSAR Results Subsidence Uplift Subsidence and Uplift June 1, 1992 Nov 26, 2000 From Katzenstein,
20 Monitoring System InSAR Results From Katzenstein, 2008 Deformation Rate vs. Time Deformation Rate (cm/yr) Time (Calendar Year) 20
21 4. Impact Evaluation Flow Model From Maurer et al., 1996 Pre-Mining Water Level ( ) MODFLOW Model Grids 21
22 Flow Model Steady State (Pre-mining) Simulated Water Level (ft amsl) statistics of observed-simulated water levels number of wells 167 mean observed head 5,289 root mean square error (ft) 24.9 standard deviation of residual error (ft) 25.0 bias (mean error in ft) calibration ratio R-squared Measured Water Level (ft amsl) 22
23 Flow Model Transient (Pit Area) 5,300 5,100 4,900 Measured Pit Composite Water level (ft amsl) 4,700 4,500 4,300 4,100 Betze simulated, layer 1 Betze simulated, layer 2 Betze simulated, layer 3 3,900 3,700 3,500 1/1/1988 1/1/1992 1/1/1996 1/1/2000 1/1/2004 1/1/
24 Flow Model Transient (Mountain Block) 6,700 6,600 NA-37A NA-37B NA-37C NA-37 simulated, layer 1 NA-37 simulated, layer 2 NA-37 simulated, layer 4 Water elevation (ft a.m.s.l.) 6,500 6,400 6,300 6,200 6,100 6,000 1/1/1988 1/1/1992 1/1/1996 1/1/2000 1/1/2004 1/1/
25 Flow Model Transient (Infiltration Basin) Water elevation in ft a.m.s.l NA NA-14 simulated, layer /1/1988 1/1/1992 1/1/1996 1/1/2000 1/1/2004 1/1/
26 Flow Model Transient (Surface Water) 26
27 Flow Model Projection Simulated Maximum Drawdown (10 feet) Post-Mining Pit Lake Recovery 5200 Simulated Pit Stage Stage in feet (amsl) Groundwater level Pit water stage Recovery Time in Year 27
28 5. Conclusions Groundwater pumping at Goldstrike has resulted in 520 m of drawdown around the mine site. Most of the water pumped at the mine has been returned to the same hydrologic basin. Extensive monitoring program, assisted by modern satellite technology and by robust modeling, has identified aquifer responses. Improvement of the water-management system, the monitoring network, the modeling and analysis continue at Goldstrike. 28
29 Thank You for Your Attention! 29
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