Newmont Goldcorp’s engineering, construction and operating standards and technical guidance explicitly cover tailings management and establish requirements to ensure safe and stable facilities throughout their operating and post-mine closure life. The design, construction and operation of all tailings impoundment facilities are scrutinized through our Investment System process, supported by inspections and audits, critical controls and strict application of annual inspections by independent qualified geotechnical engineers. Our approach covers:

  • Standards, Guidelines and Governance
  • Audits, Inspections and Reporting
  • Emergency Response, Planning and Communications

Governance is required at all levels of the organization to support our overall approach. At all phases of the life cycle facilities are inspected at multiple levels – site, regional, corporate and external. Newmont Goldcorp’s engineering, construction and operating standards and technical guidance explicitly cover tailings management and establish requirements to ensure safe and stable facilities throughout their operating and post-mine closure life. The design, construction and operation of all tailings impoundment facilities are scrutinized through our Investment System process, supported by inspections and audits, critical controls and strict application of annual inspections by independent qualified geotechnical engineers. Newmont Goldcorp’s Environmental Standard for Closure and Reclamation Management covers the long-term management of tailings impoundment facilities to ensure safe and stable conditions.

Newmont Goldcorp has both operational and closed tailings impoundments in a variety of climatic and topographic settings. Newmont Goldcorp conducts extensive siting, engineering, environmental and social studies to support the specific selection and design of each facility. Annually, Newmont Goldcorp safely manages and disposes more than 100 million tonnes of tailings that are placed within engineered, surface containment facilities; used to backfill former mining pits; or placed as structural backfill paste in underground mines.

Tailings are created as mined ore is processed into particles of fine sand through crushing, grinding and milling. Mined ore is moved to the milling circuit where the rock is reduced into sand and silt sized particles and then mixed with water and moved as slurry through the gold, silver and copper recovery process. The valuable minerals are separated from the rest of the milled rock particles either through physical or chemical recovery processes. After removal of the valuable minerals, the remaining milled rock slurry, now referred to as tailings, is pumped or flows by gravity to an engineered impoundment area.

Tailings storage facility – Gold Quarry, Nevada

These engineered impoundments are carefully designed, constructed and operated to safely contain the tailings and water, even during extreme climatic or seismic events. Depending on the chemical characteristics of the tailings and the surrounding environment, the engineered tailings impoundment will generally be lined with a composite liner system consisting of a low permeability soil liner overlain by a geosynthetic liner such as high density polyurethane (HDPE) to prevent impacts to surface and groundwater systems. As the tailings slurry is deposited in the impoundment, the water separates from the heavier sand and silt particles and collects to form a decant/reclaim pond on the surface of the impoundment.

The tailings pond water is then recycled back into the milling process for reuse. The tailings are contained within the impoundment facility and once it reaches capacity, the impoundment is reclaimed with a designed cover system used to minimize erosion and infiltration, while maintaining containment of the materials, protecting the environment and achieving post-mining designated land use.

Impoundments are designed and constructed to store both tailings and water. The construction methods include two main types of impoundments: (1) water retention dams and (2) raised impoundments. Water retention dams are typically constructed to their full height prior to anything being stored upstream and raised impoundments are raised over time to store additional material. Raised impoundments are the most commonly used method for tailings storage facilities (TSFs). The raised impoundment design methods for TSFs are typically downstream, upstream or centerline. This designates the direction in which the embankment crest moves in relation to the starter dam (dyke) and the base of the embankment. Modified centerline is a combination method using both upstream and centerline.

Upstream

Construction of an upstream embankment begins with development of a starter dyke. The tailings are then discharged from the dam crest and form the foundation for future raises. Figure 1 shows an overview of the stages of construction.

 

Centerline

he centerline method combines both upstream and downstream designs. Unlike the upstream method, where tailings are normally deposited from the crest when raises are required, material is placed on both the tailings and the existing impoundment. The embankment is raised vertically and does not move in relation to the upstream and downstream directions of raises as shown on Figure 3.

This design method often also incorporates internal drainage. Modified centerline is a combination of upstream and centerline methods and is done to reduce the volume of construction material that is required to be placed downstream from the embankment.

Tailings can be discharged using subaqueous (below water) or subaerial techniques. Subaerial deposition is more common than subaqueous as it forms a sloping beach toward the reclaim/decant pond. Subaerial can be done from single or multiple discharge points and can be rotated around the facility. Subaqueous deposition is normally completed when there is a potential for oxidation that could result in mobilized acid mine drainage. Subaqueous deposition can be completed in conventional impoundments, as well as offshore.

Tailings can be dewatered or modified in other ways prior to deposition. The current methods include:

  • Thickened tailings (which involves a process of dewatering to form a low solids content slurry);
  • Paste (which includes dewatering until the tailings do not segregate as they are deposited and have minimal excess water);
  • Dry stack (includes dewatering to a filtered wet and dry cake that cannot be transported via a pipeline); and
  • Co-disposal which includes mixing mine waste with dewatered tailings (other terminology includes co-mingling, co-placement or co-deposition whereby each has slightly different methods of mixing material).

 

Technical Guideline

Newmont Goldcorp’s Environmental Standard for Tailings and Heap Leach Facility Management sets the minimum requirements for the design and management of tailings storage facilities (TSFs) to protect human health, wildlife, flora, groundwater and/or surface water, prevent uncontrolled release to the environment, manage process fluids, and identifies requirements for closure and reclamation.

The standard works in conjunction with other standards and incorporates the International Council on Mining and Metals’ position statement on ‘Preventing Catastrophic Failure of Tailings Storage Facilities.’ All Newmont Goldcorp sites identify, assess and comply with laws, regulations, permits, licenses, external standards and other relevant or appropriate requirements. https://www.newmontgoldcorp.com/wp-content/uploads/2019/04/Tailings-and-Heap-Leach-Facility-Management-Standard_September-2017.pdf

Planning and Design
  • Sites complete a baseline of conditions prior to design of the TSF, including evaluation of land use, hydrology/hydrogeology, geochemistry, biodiversity, cultural resources geology, seismicity, soil and visual aesthetics.
  • Management plans must be developed to restrict potential releases to the environment.
  • Management plans are expected to include: design and operating criteria, schedules for inspections, monitoring and maintenance, applicable regulatory, legal or
    other requirements, management methods, risks assessments, overview of instrumentation including KPIs/critical controls, organization structure (roles and responsibilities), training requirements, emergency response plans (inundation mapping and analysis) and concurrent reclamation.
  • Fluid management plans that describe management of solution levels based on the site-wide water balance. The plan will also identify trigger alert levels and contingency plans during operations, closure and reclamation phases.
  • Characterization and specifications for geochemical and physical properties of the construction and tailings materials.
  • Engineering requirements for seepage control, liners, and leak collection recovery systems. With excess solutions that may require discharge complying with applicable quality and quantity discharge limits based on downstream beneficial use.
  • Engineering requirements for geotechnical stability including systems for storm containment and runoff that reduce erosion potential and impact to the containment.
  • Requirements for piezometers to monitor solution pressure in the embankments and tailings. Groundwater monitoring wells to establish baseline and monitor potential seepage.
  • Risk-based assessments determine whether the design criteria ensure adequate levels of protection.
  • Quality control and quality assurance protocols are required to document the construction complies with engineering design.
Implementation and Management
  • All facilities will have critical controls to mitigate significant risks with risk assessments conducted annually or at major milestones.
  • TSF and fluid management plans must be reviewed and updated annually.
  • Site-wide water balances are updated over the life of the operations to reflect changes in mine plans, processing and operations.
  • The tailings facilities must be operated within design specifications including piezometer head in embankments and tailings and the management of the pond with design and operational criteria.
  • A closure and reclamation plan shall incorporate the requirements of the fluid management plan and support stormwater and erosion management while achieving post-mining land use.
  • The TSF is managed to be protective of the environment and adheres to the requirements of the International Cyanide Management Code, and permit/license/regulatory requirements as any other legal obligations or voluntary commitments.
Performance Monitoring
  • Tailings impoundments shall be inspected for erosional and geotechnical stability, material characterization (geochemistry and ARD potential), trigger limits and critical controls.
  • Annual geotechnical reviews are required by a qualified independent senior geotechnical engineer. Independent tailings review boards (ITRB) have been identified based on technical, social and political risks identified by Newmont Goldcorp leadership and are conducted as a portion of the TSFs on an annual basis.
  • Routine inspections to verify integrity and to support maintenance and repair programs as defined in the monitoring plans. This includes all instrumentation including piezometers, inclinometers, settlement points and rate of rise as defined in the monitoring plans. Inspection and maintenance activities are also completing following events (rainfall, seismic etc.).

Newmont Goldcorp’s Technical Services team has developed Tailings Facility Geotechnical Guidelines that define minimum requirements for tailings impoundments:

  • Definitions for tailings embankments
  • Responsibilities of engineering and management staff
  • Geotechnical input design criteria guidelines for:
    • Foundation settlement and consolidation
    • Seismic loading
    • Liquefaction
    • Hydraulic properties of the foundation, soil liners and drainage layers
    • Water management systems
    • Tailings rheology and characteristics
  • Geotechnical process design for:
    • Geotechnical field investigations
    • Laboratory testing
    • Engineering design
  • Geotechnical design requirements for each level of Project Design
  • Risk analysis
  • Quality assurance/quality control

Newmont Goldcorp’s Technical Services team has also developed Seismic Design Criteria Guidelines that define minimum requirements for design, construction and operation of tailings impoundments to ensure safe and stable operations for region-specific seismic events. Each operation develops and implements site-specific Standard Operating Procedures (SOPs) and manuals based the tailings impoundment design. Site-specific SOPs consist of per shift activities including inspections of pipelines, open liner, embankments, pond levels and leak detection systems.

 

All Newmont Goldcorp operations have Emergency Response Plans that define chain of command and communications and actions to take during emergencies. Additionally, Newmont operations have developed site-specific dam break inundation analysis plans to support emergency planning including communications and evacuation notification.

In most jurisdictions, Newmont Goldcorp operations also do joint drills and exercises with local emergency response teams to prepare for emergencies. It should be noted that Newmont Goldcorp has contingency plans in place at every operation that describe trigger levels and detailed actions required to prevent overtopping of tailings impoundments. This includes reporting that is completed on a monthly basis associated with critical controls.

Newmont Goldcorp has a number of programs through the Sustainability & External Relations and Technical Services teams for auditing, inspecting and reporting on the stability of our tailings facilities. The Technical Services team routinely conducts geotechnical reviews with the internal engineering team and reviews annual inspection reports prepared
by independent qualified geotechnical engineers and Independent Technical Review Boards. Reporting on tailings management systems at the corporate level can be found at: https://www.newmontgoldcorp.com/sustainability/sustainability-reporting/environmental-stewardship/tailings-waste-and-emissions/

To improve understanding of the potential risks associated with tailings storage facility management, potential catastrophic failure was added as an enterprise risk in 2017 at the corporate, regional and site levels. Critical controls are reviewed and reported on a monthly basis at each operation as part of Newmont Goldcorp’s Enterprise Risk Management program.

Goldcorp developed a Tailings Stewardship Program in 2015 as part of a commitment to the safe and environmentally responsible development, operation and management of tailings storage facilities with focus to reduce risks by ensuring good practices are implemented at all Goldcorp tailings storage facilities and qualifying water dams. The current program is based on regulatory requirements, incorporates industry best practices and Goldcorp’s desire to be an industry leader in our sustainability practices. Tailings stewardship is designed to identify issues and concerns, manage liabilities, identify opportunities for operational efficiency, provide input into design, construction, operation and mine closure, educate operators, improve data management, provide a standardized review process, and prepare for upsets.

Dam Safety Inspections and risk assessments are updated annually to manage tailings in a manner that effectively mitigates environmental, public health and safety, and community impacts while maintaining the long-term security of the tailings facility and sustainable land use options. Tailings facilities are managed commensurate with the risks they pose, with the objectives of preventing performance failures and meeting environmental requirements. All solids and water are managed within designated areas that meet design intent, and tailings management complies with regulatory requirements and conform to sound engineering practice, company standards, tailings management framework, and commitments to communities of interest including Indigenous groups.

A work plan has been developed to integrate Goldcorp’s tailings storage facilities into Newmont Goldcorp’s standards and governance system within 12 months after closing. This will include gap assessments and action to meet the standards, site visits and inspections and implementation of critical controls and independent technical review boards for all active operations.

The tables below include an inventory of the location and size of tailings storage facilities at both operating and legacy sites. The sites shown are owned and operated by Newmont Goldcorp unless otherwise noted.

Operating Facilities
Mine site, Location and Ownership Facility Construction Method Area/Storage Capacity/ Max Height Most Recent Inspection Facility Life Status Nearest Town or
Body of Water
Boddington WA, Austraila Residue Disposal Area Upstream/ modified Centerline
  • Area – 1,200 hectares
  • Storage Capacity – 600 Mt
  • Max Height – 68 m
July 2018 2025 Active
  • 20 km from the Hotham River
  • 80 km from the North Dandalup Dam (WA Reservoir)
R4 Residue Disposal Area Upstream
  • Area – 1,000 Hectareas
  • Storage Capacity – 60 Mt
  • Max Height – 27 m
May 2018 n/a Inactive/ Care and maintenance
  • 20 km from the Hotham River
  • 80 km from the North Dandalup Dam (WA Reservoir)
KCGM WA, Australia Joint Venture – Operator Fimiston 1 TSF Upstream
  • Area – 110 Hectareas
  • Storage Capacity – 50 Mt
  • Max Height – 60 m
July 2018 2028 Active
  • 10 km to Hannans Lake
  • 3 km to Kalgoorlie
Fimiston II TSF upstream
  • Area – 350 hectares
  • Storage Capacity – 157 Mt
  • Max Height – 60 m
July 2018 2028 Inactive/ Care and Maintenance
  • 9 km to Hannans Lake
  • 5.5 km to Kalgoorlie
Kaltails TSF upstream
  • Area – 240 hectares
  • Storage Capacity – 124 Mt
  • Max Height – 60 m
July 2018 2028 active
  • 4 km to Hannans Lake
  • 8 km to Kalgoorlie
Gidji I TSF Downstream
  • Storage Capacity – 27 Mt
  • Max Height – 30 m
July 2018 2021 Inactive/ Care and Maintenance
  • 16 km to kalgoorlie
Gidji II TSF Downstream
  • Storage Capacity – 1 Mt
  • Max Height – 25 m
July 2018 2021 active
  • 16 km to kalgoorlie
mullingar Uncertian
  • Storage Capacity – 0.13 Mt
  • Max Height – 8 m
n/a Inactive/ Care and Maintenance
  • 4 km to kalgoorlie
Mt. Percy Upstream
  • Area – 55 hectares
  • Storage Capacity – 12.6 Mt
  • Max Height – 23 m
July 2018 n/a Inactive/ Care and Maintenance
  • 2 km from Kalgoorie and about 1 km from Ninga
Paringa Uncertain
  • Area – 18 hectares
  • Storage Capacity – 1.3 Mt
  • Max Height – 5 m
n/a Inactive/ Care and Maintenance
  • 9.5 km from Hannas Lake and 3.5 km from Kalgoorlie
Croesus Uncertain
  • Area – 15.3 hectares
  • Storage Capacity – 6.4 Mt
  • Max Height – 20 m
2012 n/a Inactive/ Care and Maintenance
  • 600 m from Kalgoorie but drains towards Fimiston Pit
Old Croesus Uncertain, mostly encapsulated in waste rock
  • Area – 5.8 hectares
  • Storage Capacity – 3.2 Mt
  • Max Height – 23 m
n/a Inactive/ Care and Maintenance
  • 1.3 km from Kalgoorlie
Mine site, Location and Ownership Facility Construction Method Area/Storage Capacity/ Max Height Most Recent Inspection Facility Life Status Nearest Town or Body of Water
Tanami NT, Australia GTD08 TSF Upstream
  • Area – 170 hectares
  • Storage Capacity – 25.5 Mt
  • Max Height – 15 m
August 2018 2025 Active
  • 260 km to Lake Mackay
GTD03 TSF Upstream
  • Area – 83 hectares
  • Storage Capacity – 10.5 Mt
  • Max Height – 15 m
August 2018 n/a Inactive Care and Maintenance
  • 260 km to Lake Mackay
GTD01/02 TSF Upstream
  • Area – 71 hectares
  • Storage Capacity – 6.8 Mt (Currently mined for paste backfill)
  • Max Height – 15 m
August 2018 Currently mined for paste backfill Inactive Care and Maintenance
  • 260 km to Lake Mackay
Shoe (gtd04) In-Pit
  • Area – 22 hectares
  • Storage Capacity – 1.5 Mt
  • Max Height – 6 m
August 2018 n/a active
  • 260 km to Lake Mackay
Quorn (gtd05) In-Pit
  • Area – 38 hectares
  • Storage Capacity – 6 Mt
  • Max Height – 12 m
August 2018 n/a Inactive/ Care and Maintenance
  • 260 km to Lake Mackay
Bunkers (gtd06) In-Pit
  • Area – 14 hectares
  • Storage Capacity – 0.6 Mt
  • Max Height – 3 m
April 2017 n/a Closed/ Rehabilitated
  • 260 km to Lake Mackay
Bullakitchie (gtd07) In-Pit
  • Area – 15.5 hectares
  • Storage Capacity – n/a (no above ground storage)
  • Max Height – No above ground storage
2005 n/a Closed/ Rehabilitated
  • 260 km to Lake Mackay
Carlin Nevada, USA Mill1 TSF Modifed Centerline/ Upstream
  • Area – 52 hectares
  • Storage Capacity – 22 Mt
  • Max Height – 90 m
September 2018 n/a Closed
  • Proximity to the Mill 1 site and the North Area Offices
Mill 4/2 TSF Downstream
  • Area – 20 hectares
  • Storage Capacity – 16 Mt (Currently mined for paste backfill)
  • Max Height – 195 m
September 2018 Currently mined for paste backfill Inactive/ Care and Maintenance
  • 2.8 km to Betze-Post Pit (onsite)
  • 11.8 km to North Area Offices (onsite)
Mill 3 (Rain) TSF Downstream
  • Area – 37 hectares
  • Storage Capacity – 5.4 Mt
  • Max Height – 107 m
September 2018 n/a Closed
  • 12 km from Pine Valley Creek
  • 0.02 km from Ferdelford Creek
Mill 5/6 TSF Downstream
  • Area – 200 hectares
  • Storage Capacity – 150 Mt
  • Max Height – 90 m
April 2019 2025 Active
  • 9.7 km from Carlin, NV
  • 0.8 km from Maggie Creek
Mine site, Location and Ownership Facility Construction Method Area/Storage Capacity/ Max Height Most Recent Inspection Facility Life Status Nearest Town or Body of Water
Carlin Nevada, USA Mill 5/6 West TSF Downstream
  • Area – 90 hectares
  • Storage Capacity – 60 Mt
  • Max Height – 64 m
April 2019 2025 Active
  • 11.3 km to Carlin, NV
  • 1.2 km to Maggie Creek
Mill 5/6 East TSF Downstream
  • Area – 210 hectares
  • Storage Capacity – 27 Mt (Currently under construction)
  • Max Height – 70 m
April 2019 2025 Active
  • 11 km to Carlin, NV
  • 0.6 km to Maggie Creek
James Creek TSF Downstream
  • Area – 32 hectares
  • Storage Capacity – N/A (majority removed as part of Gold Quarry layback)
September 2018 2028 Closed
  • James Creek
Phoenix Nevada, USA Phoenix TSF Downstream/ Modified Centerline
  • Area – 82 hectares
  • Storage Capacity – 200 Mt
  • Max Height – 158 m
September 2018 2028 Active
  • 24.1 km from Battle Mountain
  • 2.1 km from Willow Creek
Lone Tree Mine Section 23 TSF Downstream
  • Area – 125 hectares
  • Storage Capacity – 25 Mt
September 2018 n/a closed
  • 8.5 km from Valmy
  • 3 km from Humbolt River
Twin Creeks Nevada, USA Juniper TSF Modified Centerline/ Upstream
  • Area – 340 hectares
  • Volume – 300 Mt
  • Max Height – 73 m
September 2018 2032 Active
  • 64 km from Golconda, NV
  • 6.4 km from Rabbit Creek
Pinson TSF Downstream
  • Area – 58 hectares
  • Storage Capacity – 12.3 Mt
September 2018 n/a closed
  • Located near Pinion oxide ore mill greater than 64 km from Goldconda, NV
Merian Suriname, South America Merian TSF Downstream
  • Area – 710 hectares
  • Storage Capacity – 135 Mt
  • Max Height – 47 m
August 2018 2029 Active
  • 34 km from Java, Suriname
Yanachocha Peru, South America LQ Mill Sands Facility South TSF Downstream
  • Area – 60 hectares
  • Storage Capacity – 72 Mt
  • Max Height – 80 m
October 2018 2019 Inactive/ Care and Matintenance
  • 5.6 km to Rio Grande Dam
  • 2.3 km to Rio Rejo Dam
LQ Mill Sands Facility North TSF Downstream
  • Area – 40 hectares
  • Storage Capacity – 29 Mt
  • Max Height – 80 m
October 2018 2024 Active
  • 5.6 km to Rio Grande Dam
  • 2.3 km to Rio Rejo Dam
Akyem Ghana, Africa TSF Cell 1 Downstream
  • Area – 160 hectares
  • Storage Capacity – 43 Mt
  • Max Height – 36 m
May 2018 2019 Active
  • Mamang River Forest Reserve
Mine site, Location and Ownership Facility Construction Method Area/Storage Capacity/ Max Height Most Recent Inspection Facility Life Status Nearest Town or Body of Water
Akyem Ghana, Africa TSF Cell 2 Downstream/ Modified Centerline
  • Area – 100 hectares
  • Storage Capacity – 43 Mt(under construction)
  • Max Height – 30 m
Under construction 2024 Under Construction
  • Adjacent to Cell 1
Ahafo Ghana, Africa Ahafo TSF Downstream/ Modified Centerline
  • Area – 573 hectares
  • Storage Capacity – 166 Mt
  • Max Height – 40 m
May 2018 2038 Active
  • 4.4 km to Kenyasi Resettlement
  • 1.3 km to Dokyikrom Village
Penasquito Zacatecas. Mexico Presa de Jales Centerline
  • Area – 700 hectares
  • Storage Capacity – 823 Mt
  • Max Height – 90 m
August 2018 2028 Active
  • 2 km south to Las Mesas
Cerro Negro Santa Cruz, Argentina TSF 1 Downstream
  • Area – 53 hectares
  • Storage Capacity – 4.3 Mt
  • Max Height – 38 m
October 2018 2021 Active
  • 19 km west to Rio Pintura
RLGM – Campbell Complex Tailings Onterio, Canada South, West, Northwest and North Dams Modified Centerline
  • Area – 110 hectares
  • Storage Capacity – 2.25 Mt
  • Max Height – 13.5 m
June 2018 2020 (dam raise planned to extend the life to 2024) Active
  • Nearest community is Balmertown, 0.5 km to the Southwest
RLGM – Red Lake Complex Tailings Ontario, Canada North, East End, Splitter Dyke 1/2 Primary Pond and Secondary Pond Dams Modified Centerline/ Downstream
  • Area – 170 hectares
  • Storage Capacity – 1.9 Mt
  • Max Height – 15 m
June 2018 2024 Active
  • Nearest community is Balmertown, 2.5 km to the Southwest
Cochenour Wilanour Complex TMA Centerline
  • Area – 100 hectares
  • Storage Capacity – 4 Mt
  • Max Height – 7 m
June 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Town of Cochenour <0.5 km to the North
Musselwhite Ontario, Canada Tailings Discharge Dykes Centerline/ Internal upstream with perimeter dams
  • Area – 215 hectares
  • Storage Capacity – 32 Mt
  • Max Height – 21 m
July 2018 2029 Active
  • Nearest water body – Zeemel Lake is approximately 450 meters from toe of dam; 3.4 km northwest to Opapimiksan Lake
Porcupine Ontario, Canada Dome No.6 TMA Downstream
  • Area – 500 hectares
  • Storage Capacity – 305 Mt
  • Max Height – 33 m
June 2018 2028 Active
  • 5 km to North to South Porcupine and 6 km Northeast to Porcupine Lake and 10 km Northwest to Timmins
Broulan Reef Downstream, buttressed
  • Area – 20 hectares
  • Storage Capacity – 4.8 Mt
  • Max Height – 20 m
June 2018 n/a Active
  • Nearest community is South Porcupine and the nearest water is Porcupine River
Mine site, Location and Ownership Facility Construction Method Area/Storage Capacity/ Max Height Most Recent Inspection Facility Life Status Nearest Town or Body of Water
Porcupine Ontario, Canada Dome 1, 2 and 2A – Upstream
  • Area – 167 hectares
  • Storage Capacity – 65 Mt
  • Max Height – 24 m
June 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is South Porcupine and the nearest water is Porcupine River
Dome #3 Upstream
  • Area – 38 hectares
  • Storage Capacity – 13 Mt
  • Max Height – 18 m
May 2017 n/a Inactive/ Care and Maintenance
  • Nearest community is Dome Mine Site and Timmins
Dome #4 Upstream
  • Area – 38 hectares
  • Storage Capacity – 3 Mt
  • Max Height – 10 m
May 2017 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins and nearest water body is Porcupine River and Edwards Lake
Dome #5 Upstream
  • Area – 9 hectares
  • Storage Capacity – 1.3 Mt
  • Max Height – 8 m
May 2017 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins and nearest water body is Porcupine River and Edwards Lake
Paymaster North Upstream
  • Area – 26 hectares
  • Storage Capacity – 5.3 Mt
  • Max Height – 11 m
May 2017 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins and nearest water body is Simpson Lake
Paymaster South Upstream
  • Area – 15 hectares
  • Storage Capacity – 2.8 Mt
  • Max Height – 10 m
May 2017 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins and nearest water body is Simpson Lake
McIntyre Upstream
  • Area – 215 hectares
  • Storage Capacity – 59 Mt
  • Max Height – 5 m
June 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins and nearest water body is Porcupine River and Clear Water Lake
Pamour T3 Upstream
  • Area – 125 hectares
  • Storage Capacity – 32 Mt
  • Max Height – 14 m
June 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins and nearest water body is Porcupine River
Pamour T2 Upstream
  • Area – 69 hectares
  • Storage Capacity – 38 Mt
  • Max Height – 30 m
June 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins (Pamour Pit between) and nearest water body is Porcupine River tributaries and Three Nations Lake
Pamour T1 Upstream
  • Area – 57 hectares
  • Storage Capacity – 6 Mt
  • Max Height – 15 m
June 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins (Pamour Pit is between)
Anour A Upstream
  • Area – 6 hectares
  • Storage Capacity – 1.4 Mt
  • Max Height – 14 m
June 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins (Buffalo Ankerite community) and the nearest water body is Porcupine River
Mine site, Location and Ownership Facility Construction Method Area/Storage Capacity/ Max Height Most Recent Inspection Facility Life Status Nearest Town or Body of Water
Porcupine Ontario, Canada Aunor B Upstream
  • Area – 8 hectares
  • Storage Capacity – 2.3 Mt
  • Max Height – 18 m
June 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Buffalo Ankerite community and the nearest water body is Porcupine River
Delnite Upstream
  • Area – 16 hectares
  • Storage Capacity – 3 Mt
  • Max Height – 16 m
May 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins(Delnite community) and the nearest water body is Porcupine River
Hallnor Upstream
  • Area – 47 hectares
  • Storage Capacity – 9.1 Mt
  • Max Height – 11 m
May 2018 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins and the nearest water body is Porcupine River
Conniaurum Upstream
  • Area – 49 hectares
  • Storage Capacity – 9 Mt
  • Max Height – 10 m
May 2017 n/a Inactive/ Care and Maintenance
  • Nearest community is Timmins and the nearest water body is Porcupine River

Note:

  1. This table does not include the three facilities that use filtered tailings.
    • Currently filtered tailings are mixed with waste rock into the heap leach facility at CC&V,
    • Used as paste backfill for our underground operations at Carlin (Nevada) and Tanami (Australia).
    • And dry stacked on the waste rock dump at Eleonore (Quebec, Canada)
  2. This table does not identify internal dams to the tailings impoundment
  3. Tailings storage facilities that are located on non-operated JVs by Newmont Goldcorp are not included in the table
Legacy Sites
Mine site, Location and Ownership Status Number of Dams/Area Most Recent Inspecation
Mt. Leyshon Queensland, Australia Reclaimed and Closed
  • Tailings area – 200 hectares
  • Storage volume – 48 Mt
  • Max Height – 43 m
  • 3 tailings facility
February 2019
Miramar-Con Mine North West Territories, Canada Reclaimed and Closed (2 dams with water covers)
  • Tailings area – 80 hectares
  • Storage volume – 4.7 Mt
  • Max Height – 13 m
  • 3 tailings facility
June 2018
Golden Giant Ontario, Canada Inactive with water cover
  • Tailings area – 80 hectares
  • Storage volume – 15.3 Mt
  • Max Height – 38 m
  • 1 tailings facility
May 2018
Empire Mine State Historic Park California, USA In discussions on reclamtion requirments; currently area has regrown with forest. Facilities are inactive.
The sand dam is owned by the California State Parks
  • Tailings area – 61 hectares
  • Storage volume – 15.3 Mt
  • Max Height – 21 m
  • 2 tailings facility
July 2017
Battle Mountain Resources – San Luis Mine Facility has been left partially open for brine disposal (treatment facility) and for managment of water during plant upset conditions. Facility is inactive.
  • Tailings area – 60 hectares
  • Storage volume – 1.7 Mt
  • Max Height – 47 m
  • 1 tailings facility
August 2018
Idarado Mining Co- Colorado, USA Reclaimed and closed
  • Tailings area – 40 hectares
  • Storage volume – 17 Mt
  • Max Height – 30 m
  • 6 tailings facility and 1 buried
September 2018
Resurrection Mining Co- California Gultch Colorado, USA Reclaimed and closed
  • Tailings area – 14 hectares
  • Storage volume – approx… 1 Mt
  • Max Height – 29 m
  • 3 tailings facility
September 2018
Resurrection Mining Co- Black Cloud Mine Colorado, USA Reclaimed and closed
  • Tailings area – 54 hectares
  • Storage volume – 1.4 Mt
  • Max Height – 29 m
  • 1 tailings facility
September 2018
Dawn Mill/Midnite Mine Washington, USA Reclaimed and closed
  • Tailings area – 73 hectares
  • Storage volume – 7.2 Mt
  • Max Height – 9 m
  • 1 tailings facility was constructed below grade. There other facility has a small disposal area above ground.
Inspections as part of ongoing construction activities – no formalized external inpections
Marlin San Marcos, Guatemala Inactive/care and maintenance Ongoing closure – cover placement
  • Tailings area – 45 hectares
  • Storage volume – 22.5 Mt
  • Max Height – 82.5 m
  • 1 tailings facility
August 2018
Equity British Columbia, Canada Inactive with water cover – cover placment
  • Tailings area – 138 hectares
  • Storage volume – 72 Mt
  • Max Height – 61 m
  • 1 tailings facility
August 2018
Dona Lake Ontario, Canada Inactive,care and maintenance – cover placment
  • Tailings area – 28.6 hectares
  • Storage volume – 1 Mt
  • Max Height – 15 m
  • 1 tailings facility
February 2016

Notes:

  1. For legacy facilities inactive is defined as no longer having deposition activities.
  2. Reclaimed and closed refers an inactive dam that has been closed with the placement of a water or soil cover, revegetation and construction of water management structures.
  3. The sites with water covers designed for closure and management of acid rock drainage have been defined.
Church of England Pensions Board and Swedish Council on Ethics for the AP Public Pension Fund – Tailings Management Approach and Inventory Disclosure

Newmont Goldcorp developed a disclosure in response to the Church of England April 10, 2019 request for information concerning tailings dam management. This disclosure provides Newmont Goldcorp’s approach to tailings; communications and risk management; a description of updates to our approach following recent disasters; and an inventory of tailings dam facilities for our operating sites, joint ventures, subsidiaries, and legacy sites as of April 10, 2019. Click here to view this disclosure.

For all Newmont Goldcorp tailings related requests, please email Briana.Gunn@newmont.com

John.Lupo@newmont.com