GOLDEN GIANTMINE
Contributions and Achievements
614
Golden GiantMine
• Production life…from 1985 to 2006• Initial Capital Expenditure $C290 million
• First Blade to First Gold Brick in 2 years
• Total of 19.1 million tonnes of Ore Milled
• Average Gold Head Grade 11 grams/tonne
• Total Gold Sold 6.7 million ounces
• Total Gold Revenue $C3.2 billion
• Total Costs/Expenditures $C1.9 billion
• Total Corp/Mining Taxes $C660 million
• Total Labour Costs $C440 million
• Total Local Taxes $C23.8 million
• Local Charitable Donations over $C1.5 million
• Employed over 1500 plus 650 for construction
GOLDEN GIANTMINE
Closure - Points of Interest
• Staged layoffs (over 250) in 2005/2006
• Last ore hoisted Jan 11th 2006
• Site became inactive Aug 31st 2006 (<5 employees)
• Deconstruction/demolition – completed by Sep 2010
• done by asset purchaser• 200+ trucks of equipment & 3 M kg scrap metal
• Reclamation/restoration – completion by ~2015
• done by property purchaser• Mill gold salvage - in house and contractor
• 71,325 oz !!! recovered by Q4 2007• Asset sales - buildings, s/u equipment, mine property
• $6.659 Million plus royalties
GOLDEN GIANTMINE
Closure Plan Overview
• Closure Plan Objectives– Public health and safety– Minimizing environmental impacts and– Rehabilitation of the site to a compatible land use
• Original Closure Plan accepted by MNDM April 1997– Several updates for addition of WWTP, PSA, GCS– Reviewed by MOE, MNR, MOL, MNDM and local COI (28 copies)– Includes financial assurance of $C14.7 Million
• Primary Focus Now – Managing the Interlake Tailings Facility & WWTP
GOLDEN GIANTMINE
Interlake Tailings Facility
• $50 Million for 4 Dams, grouting, HDPE 80mil liner, clay core top
• 15.3 M tonnes of tailings deposited under water cover
• 1984 - GCP trench intercept system for main Dam 41
• Capturing 95% of Dam 41 seepages since 1985 • 2014 - GCS for Dam 43/Dam 44 interceptor pump wells
• needed to mitigate sulphate in headwater creeks• Capture ~87% of Dam 43/44 seepages• $3.0 Million for new GCS - commissioning mid 2014• Target is <50 ppm sulphate for aquatic protection
• Overall seepage capture for ITF becomes 93%
• WWTP treats all ITF excess water - discharge to Cedar Creek
GOLDEN GIANTMINE
Interlake Tailings Facility
• Tailings acid generating potential and ARD seepages
– Sulphide 4.5% with little NP, NP/AP <0.3 and NNP -140 ppt
– Mo 1100, Ti 700, As 200, Sb 150, V 90, Zn 80, Hg 12 ppm
• Dam 42 and Dam 44 wells not showing ARD Fe < 0.2 ppm
• Dam 43, Dam 44 and Dam 41 wells showing ARD Fe>10 ppm
• High sulphate showing in all seepage/wells at Dam toes
• Confounding factor – pyrite deposit across ITF – west to east
• Pyrite highly fractured seams may be source of ARD Fe
GOLDEN GIANTMINE
Interlake Tailings Facility
Reclaim Water
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1998
1997
1996
1995
1994
1993
1992
1991
1990
1989
1988
1987
1986
1985
mg/
L
50
45
40
35
30
25
20
15
10
5
0
Cyanide, TotalMolybdenum, TotalAntimony, Total
GOLDEN GIANTMINE
Interlake Tailings Facility
Reclaim Water
2013
2012
2011
2010
2009
mg/
L
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
Cyanide, TotalMolybdenum, TotalAntimony, Total
Reclaim Water
2013
2012
2011
2010
2009
mg/
L
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
Cyanide, TotalMolybdenum, TotalAntimony, Total
Reclaim Water
2013
2012
2011
2010
2009
mg/
L
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
Cyanide, TotalMolybdenum, TotalAntimony, Total
Reclaim Water
2013
2012
2011
2010
2009
mg/
L
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
Cyanide, TotalMolybdenum, TotalAntimony, Total
GOLDEN GIANTMINE
Interlake Tailings Facility
Reclaim Water
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
Sulp
hate
, Tot
al (
mg/
L)
2000
1750
1500
1250
1000
750
500
250
0
GOLDEN GIANTMINE
Interlake Tailings Facility – 2005 Schematic
Luigi’s Watershed Cedar Creek
ET Plant
Tailings BasinWater Diversion Dyke
Lim Lake
Seepage
Open Channel Flow
Pipeline Flow
Legend:
Mine/Mill/Plant Site
Recycle WaterMill
Tailings
GCP Facility
Black River tributaries
GOLDEN GIANTMINE
Interlake Tailings Facility – 2007 Schematic
Luigi’s Watershed
Tailings BasinWater Diversion Dyke
Seepage
Open Channel Flow
Pipeline Flow
Legend:
Cedar CreekGCP Facility
Black River tributaries
GOLDEN GIANTMINE
Interlake Tailings Facility – 2009 Schematic
Black River tributaries
Luigi’s Watershed
Tailings BasinWater Diversion Dyke
GCP Facility
Seepage
Open Channel Flow
Pipeline Flow
Legend:
Cedar Creek
WWTP Facility
GOLDEN GIANTMINE
Interlake Tailings Facility – 2014 Schematic
Black River tributaries
Luigi’s Watershed
Tailings BasinWater Diversion Dyke
GCP Facility
Seepage
Open Channel Flow
Pipeline Flow
Legend:
Cedar Creek
WWTP Facility
GCS D44
GOLDEN GIANTMINE
Interlake Tailings Facility – 2030 Schematic
Black River tributaries
Luigi’s Watershed
Tailings BasinWater Diversion Dyke
GCP Facility
Seepage
Open Channel Flow
Pipeline Flow
Legend:
Cedar Creek
EW Facility
GCS D44
GOLDEN GIANTMINE
Dam 41 - Closure + 00 Years
Particle Track ModellingCondition: Tailings Pond Water and Pore Water Contaminated
GOLDEN GIANTMINE
Dam 41 - Closure + 10 Years
Particle Track ModellingCondition: Tailings Pond Water Clean and Pore Water Near Dam Flushing
GOLDEN GIANTMINE
Dam 41 - Closure + 20 Years
Particle Track ModellingCondition: Tailings Pond Water Clean and Pore Water Near Dam Flushed Out
GOLDEN GIANTMINE
Waste Water Treatment Plant
• Design/build by WESA for $7.8 M with PLC/SCADA System
• Building done in 2008, construction from Feb to May 2009
• Commissioned Jun 8th 2009, minor upgrades over 2 years
• Design Basis: meet I/PWQO = CWQG at end of pipe
• Design Flow: 91 m3/hr in, 80 m3/hr out (backwash/sludge 11)
• Effluent limits (receiver based) - 100% compliance to date
• Effluent objectives at end of pipe - very close since Nov 2011
• Operating costs levelling off after 3 years
– Target is $500,000/yr for 450,000 m3
– Or $1.10/m3 (operators, power, chemicals, maintenance)• Testing Xogen process add-on for NH3, NO3
-1, CN-1 removal
GOLDEN GIANTMINE
WWTP Process Flow Sheet
Caustic Circuit Acid Circuit MMedia Filtration Ion Exchange EQTank
NaOH
Ferric
Polymer
Clarifier
Ferric
HCl
Polymer
Clarifier
Graded
Gravel
Sand
Anthracite
GOLDEN GIANTMINE
WWTP Effluent Water Quality
WWTP Effluent
2013
2012
2011
2010
2009
mg/
L
0.36
0.34
0.32
0.30
0.28
0.26
0.24
0.22
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
Molybdenum, TotalAntimony, TotalCofA Monthly Average Objectives - WWTP Effluent 2009+CofA Monthly Average Objectives - WWTP Effluent 2009+
GOLDEN GIANTMINE
Closing Remarks
• Long Term Monitoring Programs
• Remain under Federal MMER and MNDM/MOE requirements
• Current monitoring program will continue indefinitely
• Any modifications to the program requires Ministry approval
• Plan to reduce number of sampling stations (90) and parameters (35) once acceptable track record is achieved
• 20 year “rolling window all in costs” projected at $1.5 M/yr
• WWTP operation, EEM program, tailings dam inspections, all water monitoring programs, reporting with 4 employees
GOLDEN GIANTMINE
QUESTIONS
Contact Information Alternate Information
Walter Sencza, P.Eng. Walleye Sencza, pHD3
Environmental Manager Jack of all Trades
Newmont Canada Corporation We Do Inc (mostly)
[email protected] [email protected]
Tel: 807-238-2108 Cell: 807-229-6087