Tailings are a common by-product remaining following the extraction and recovery of valuable minerals from mine operations. They are generated by the milling process and are a mixture of finely ground sand- to clay-sized rock particles, water and processing reagents.

Tailings management is an important component in the design and operation of mining projects. The objective of tailings management is to ensure robust processes are in place to ensure safe, long-term storage of mine tailings. New Gold has implemented a comprehensive tailings management approach focused on identifying and minimizing potential environmental and social impacts of our tailings facilities, from construction through to post-closure.

New Gold’s Tailings Facilities

Two of New Gold’s operations, the New Afton mine and the Rainy River mine, involve active tailings facilities. In addition, there is an inactive tailings facility located at the New Afton mine. More information about these tailings facilities can be found in the table below. None of the company’s active or inactive tailings facilities uses upstream construction.

Tailings Management at New Gold

As a member of the Mining Association of Canada (MAC), New Gold is committed to implementing the Towards Sustainable Mining (TSM) performance system at each of its sites in Canada (which includes both sites with tailings facilities). This includes the TSM Tailings Management Protocol, which sets out best practices in the area.

New Gold’s tailings management practices include the following important features:

  • Design: The design of New Gold’s tailings facilities takes into account the climatic and ground conditions at each site. For example, our tailings facilities are designed to consider significant natural events, such as the probable maximum flood, so that the tailings can be safely contained in the event of extreme weather or seismic events.

  • Operations practices: Each site has an operations, surveillance and maintenance manual (OMS Manual) which sets out, among other things, how the site’s tailings facilities will be operated and maintained in order to ensure that they function in accordance with their respective design performance objectives, as well as regulatory and corporate policy obligations.

  • Risk assessments: Each site conducts regular risk reviews that include tailings-related risks, the key results of which are reported to corporate management at least annually.

  • Engineer of record: Each site has appointed a qualified external professional engineer and their firm to be the engineer of record for its tailings facilities.

  • Surveillance technology: Sites use surveillance systems, such as piezometers, inclinometers, remote sensing and other technologies to monitor tailings dams and water levels. The OMS Manual sets out early-warning trigger and alert levels, facilitating early identification and management of potential dam stability concerns.

  • Inspections by personnel: The company’s tailings facilities are regularly inspected by trained New Gold employees – sometimes as frequently as several times a day.

  • Dam safety inspections: Formal dam safety inspections are conducted at least annually by the engineer of record. Recommendations made by the engineer of record are tracked to ensure follow-through by site personnel.

  • Dam safety reviews: Each facility is subject to detailed third-party external dam safety reviews every five years, comprising a review of the design basis, construction and performance.

  • Independent reviews: The company has an independent technical review board (ITRB) to provide independent, expert advice regarding the technical aspects of our tailings facilities. The ITRB meets at least twice per year to review information about tailings management practices at each facility. Recommendations made by the ITRB are reported up to the New Gold Board of Directors and progress is tracked and reported on by each site.

  • Emergency preparedness: Each site has a detailed emergency response plan, which is regularly reviewed and updated. Desktop and full scale tests of the tailings portion of the emergency response plan are routinely conducted by each site to ensure they remain relevant.
Swipe
New Afton Rainy River
New Afton tailings storage facility Pothook tailings storage facility Historic Afton tailings storage facility Rainy River tailings management area
Tailings facility
  • Dam A
  • Dam B
  • Dam C
  • South Dam
  • West Dam
  • Pothook Dam
  • West Dam
  • East Dam
  • Cell 1: TMA West Dam, TMA South Dam and Cell 1 Dam (internal)
  • Cell 2: TMA South Dam, TMA North Dam, TMA West Dam and Cell 2 Dam (internal)
  • Cell 3: TMA North Dam, TMA West Dam and TMA South Dam
Location 50.648308N
120.509096W
50.653656N
120.504666W
50.65000N
120.33333W
  • Cell 1: 48.85757N
    94.06726W
  • Cell 2: 48.86648N
    94.06353W
  • Cell 3: 48.85860N
    94.04281W
Construction method
  • Dam A - Centerline
  • Dam B - Centerline
  • Dam C - Centerline
  • South Dam - Downstream
  • West Dam - Centerline
  • Pothook Dam - Downstream
  • West Dam - Downstream
  • East Dam - Downstream
  • TMA West Dam: Centerline
  • TMA North Dam: Centerline
  • TMA South Dam: Centerline
  • Cell 1 Dam: Centerline
  • Cell 2 Dam: Centerline
Status Active Active Care and maintenance
  • Cell 1: Active
  • Cell 2: Active
  • Cell 3: Active
Current maximum height 49 m 10 m 70 m 14.5 m
Current storage impoundment volume 24,000,000 m3 2,650,000 m3 33,000,000 m3 15,000,000 m3
Most recent dam safety inspection by engineer of record 2019 2019 2019 2019
Most recent dam safety review 2017 2018 2018 New facility; first review expected 2022
Most recent ITRB review 2020 2020 2020 2020