Presentation is loading. Please wait.

Presentation is loading. Please wait.

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.

Similar presentations


Presentation on theme: "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."— Presentation transcript:

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 1.Introduction to Barrick and Goldstrike 2.Goldstrike Dewatering System 3.Goldstrike Monitoring System 4.Impact Evaluation 5.Conclusions April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Presentation Contents 2

3 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 Unit Conversion U.S. EPA Hardrock Mining Conference 20123

4 1. Introduction – Barrick April 3-5, 2012U.S. EPA Hardrock Mining Conference South America Lagunas Norte Pierina Zaldívar Cerro Casale Pascua-Lama Veladero North America Donlin Creek Golden Sunlight Hemlo Goldstrike Turquoise Ridge Marigold Bald Mountain Cortez Ruby Hill Round Mountain Pueblo Viejo ProjectMine African Barrick North Mara Kabanga Tulawaka Bulyanhulu Buzwagi Australia Pacific Porgera Cowal Granny Smith Kalgoorlie Kanowna Plutonic Darlot Lawlers Reko Diq Jabal Sayid Lumwana

5 Barrick Global Operations – Equinox Addition Plutonic Darlot Kalgoorlie Lawlers Cowal Kanowna Granny Smith Porgera A U S T R A L I A P A P U A N E W G U I N E A Mines Projects Lumwana Jabal Sayid ZAMBIA SAUDI ARABIA April 3-5, U.S. EPA Hardrock Mining Conference 2012

6 April 3-5, 2012U.S. EPA Hardrock Mining Conference Introduction – Goldstrike Mine 6

7 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Open Pit 400 m 3,700 m 2,000 m 7

8 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Underground Mines Pre-mining water table 1600 m amsl Current water table 1100 m amsl with a drawdown of 500 m 8

9 April 3-5, 2012U.S. EPA Hardrock Mining Conference Goldstrike Dewatering System 9

10 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 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 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Dewatering System - Active Piezometer Local Well Regional Well 11

12 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Dewatering System - Passive 12

13 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Dewatering System - Passive HD (1994 – 2002) Numbers: 1800 Length: 10 – 450 m Total Length: 380 km 13

14 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Water Management System 560,000 m 2 /Each 14

15 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Cumulative Water Balance 15

16 April 3-5, 2012U.S. EPA Hardrock Mining Conference Goldstrike Monitoring System – 15,000 km 2 Manual/Automatic Surface Water Monitoring Manual/Automatic Groundwater Monitoring 16

17 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 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 April 3-5, U.S. EPA Hardrock Mining Conference 2012 From Massonnet, 1997

19 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Ground Deformation – InSAR Results Subsidence Uplift Subsidence and Uplift June 1, 1992 – Nov 26, 2000 From Katzenstein,

20 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Monitoring System – InSAR Results From Katzenstein,

21 April 3-5, 2012U.S. EPA Hardrock Mining Conference Impact Evaluation – Flow Model Pre-Mining Water Level ( ) MODFLOW Model Grids From Maurer et al.,

22 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Flow Model – Steady State (Pre-mining) 22

23 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Flow Model – Transient (Pit Area) 23

24 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Flow Model – Transient (Mountain Block) 24

25 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Flow Model – Transient (Infiltration Basin) 25

26 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Flow Model – Transient (Surface Water) 26

27 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Flow Model – Projection Post-Mining Pit Lake Recovery Simulated Maximum Drawdown (10 feet) 27

28 April 3-5, 2012U.S. EPA Hardrock Mining Conference 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 April 3-5, 2012U.S. EPA Hardrock Mining Conference 2012 Thank You for Your Attention! 29


Download ppt "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."

Similar presentations


Ads by Google