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SITE LOCATION
Project overview Underground development rock storage TURKEY
Filtered tailings design placement SITE LOCATION
EXPLORE
Water management facilities
the Depths of our Experience | www.norwestcorp.com
PROJECT HIGHLIGHTS
• High grade epithermal gold vein deposit (>100,000 ounces/year) • Underground Mechanized mining – production began in June 2011 • Ore processed through a milling and flotation concentrate circuit. Filtered tailings generated from the flotation circuit and dewatered with pressure filters • Project requires above-ground development rock and “dry” tailings storage, with associated water management facilities.
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SEISMIC SETTING
Tectonic Map of Turkey. From USGS Circular 1193, Implications for Earthquake Risk Reduction in the United States from the Kocaeli, Turkey, Earthquake of August 17, 1999, modified from Barka (1992) and Rockwell and others.
Site Location M=7.6
Izmir AEGEAN PLATE
ANATOLIAN PLATE
M=6.1 Oct 23, 2011 M=7.2
Return Period
PGA*
Design Basis
1 in 475
0.5g
Operational
1 in 2475
1.0g
Closure
*Global Seismic Hazard Assessment Program (GSHAP)
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SITE CONDITIONS
• Area characterized by steep & narrow valleys • Surficial & Bedrock Geology:
Typically 10m below surface
•
Shallow seeps Sensitive watershed
Mediterranean Climate:
Semi-arid, characterized by distinct wet/dry seasons
• Land Constraints for waste placement:
Legacy land title issues
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DESIGN OVERVIEW
• 3.6 million tonnes filtered tailings • 1.8 million tonnes underground development rock • Integrated development rock/tailings disposal area • Phased design of tailings placement and development rock buttress
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ULTIMATE LAYOUT DESIGN
PLAN VIEW
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DOWN-VALLEY SECTION VIEW
11/19/2012
EXPLORE
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9
DEVELOPMENT ROCK PILE CONSTRUCTION
Site Preparation & Drain Installation
EXPLORE
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DEVELOPMENT ROCK INITIAL PLACEMENT
Approx. 630m bench
EXPLORE
•
Construction completed in y5m lifts.
•
Design consists of three y30m-high benches at angle of repose.
•
Final resloped design: 3H:1V slopes with 5m-wide benches.
the Depths of our Experience | www.norwestcorp.com
TAILINGS SITE PREPARATION & ROCK BERM INSTALLATION
Site Stripping/Foundation Prep
Rock Berm Construction
Rock Berm Underdrain
Piping system through toe berm for directing tailings seepage for downstream treatment
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Excavators to control initial placement over liner
Komatsu 51px Dozer
Vibromax (VM115D/VM115PD)
• Low ground pressure equipment used for initial placement. • Minimum 0.5m initial layer required for liner protection. • Compaction of each lift achieved through dozer and roller compaction.
Spreading of material
EXPLORE
Vibratory Roller – compacts & seals off the lifts
the Depths of our Experience | www.norwestcorp.com
WATER MANAGEMENT SYSTEM
TAILINGS AREA
Additional Contact Water Storage Capacity (East Pond) Contact Water Stored in Lower Pond & Concrete Dam
Parallel Clean & Contact Water Diversions Along Perimeter ULTIMATE DESIGN LAYOUT
• • •
19/11/2012
Ponds and Diversion Ditches sized for a 100-yr, 24-hr storm event. Clean water diversions will capture run-off from outside of disturbance areas. Interim contact water ditches will be placed as the footprint expands.
EXPLORE
EXAMPLE “TWINNED” DIVERSIONS
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21
WATER MANAGEMENT SYSTEM Water Treatment Plant Concrete Dam Pond Area Development Rock Storage
•
y12m-high lower concrete dam designed for a pond capacity of 14,700m3 (Promer Engineering).
•
Lower pond captures contact water run-off from the development rock and tailings facilities.
•
Contact water routed to the water treatment plant prior to discharge.
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PROJECT HIGHLIGHTS
• Compact site in high seismic setting • Integrated waste rock/filtered tailings design. • Dry filtered tailings placed in a lined facility • Closed system water management with treatment
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Efemçukuru Village
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EXPLORE the Depths of our Experience
11/19/2012
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the Depths of our Experience | www.norwestcorp.com
