SUSTAINABILITY Governance, standards and guidelines

Governance, standards and guidelines

Gold Fields fully supports the fact that tailings must be responsibly managed. Our vision and values underpin our desire to prevent impacts to human health and safety, the environment, and infrastructure.

The development and implementation of a tailings management system are essential to effective governance of tailings management, one of the foundations of safe tailings management, the implementation of best engineering practice, and integrated mine planning.

TSF Management Policy Statement

Planning and design

At Gold Fields, tailings management plans involve developing documents and plans related to tailings management and updating these documents and procedures as appropriate throughout the lifecycle, in alignment with corporate policy. This includes developing and updating as appropriate:

  • A detailed construction management plan, including a construction quality plan and assurance protocols that document that construction meets the design intent.
  • Closure plan
  • Design Basis Report, water balance and water management plan, tailings transportation, and deposition plan.
  • Guidance notes and engineering requirements for field investigations, laboratory testing campaigns, presentation of data and results, and geotechnical stability.
  • Guidance notes and minimum requirements for the installation of instrumentation to allow for the monitoring of pore pressures, deformations, water levels, water quality, etc.
  • Site characterisation, risk analysis and assessment, evaluation of alternatives, performance objectives, indicators, criteria, and risk management plans.

Implementation and management

Gold Fields is committed to an integrated approach to mine planning, which is essential to safe tailings management. Integrated mine planning involves the full integration of planning across the lifecycle of all aspects that can impact the project conception, design, construction, operation, and closure of tailings facilities, including:

  • Commitments to stakeholders
  • Ore extraction and ore processing
  • Site-wide water management
  • Management of other mine wastes such as waste rock
  • Mine closure

Integrated mine planning includes developing and updating as appropriate:

  • Tailings management plans and operating and surveillance manuals
  • Critical controls, trigger action response plans, risk analysis, and risk assessments
  • Performance objectives
  • Water balances (updated and calibrated)
  • Emergency response and preparedness plans
  • Closure plans

Performance monitoring

At Gold Fields, performance evaluation includes results of surveillance and reviews, both internal and independent, to evaluate:

  • operating performance against performance objectives and indicators, trigger levels, and critical controls;
  • compliance with legal requirements, and conformance with plans and commitments;
  • the risk management process, including the need to update the risk assessment;
  • the need for changes or updates to the Operating Maintenance and Surveillance (OMS) manual or other site-specific tailings management system-related documents. This includes evaluating the effectiveness of surveillance activities and the utility of the information being collected, and identifying any gaps in information collection; and
  • the need for changes or updates to the Emergency Response Plan (ERP) and Emergency Preparedness Plan (EPP).

At Gold Fields, the results and recommendations arising from performance evaluations are documented and reported every quarter to senior management and the Board, as assurance is a critical component of performance evaluation.

Guidance Notes

Gold Fields has developed guidance notes that define the minimum requirements for:

  • Dam break studies. We have developed a framework that can be applied when undertaking dam break studies at Gold Fields Tailings Storage Facility (TSF) sites to enable a consistent and credible assessment of potential failure impacts.
  • Field investigations and laboratory testing. We have developed a framework that can be applied when undertaking field investigations and laboratory testing at Gold Fields TSF sites to enable a consistent and credible assessment of potential risks.
  • OMS Manuals. Our OMS guidance note aims to provide consistency across the Group and continually work towards optimizing tailings facility performance and managing risk.
  • Third-party review. Our third-party review guidance note aims to outline a framework that can be applied when undertaking third-party reviews at Gold Fields TSF sites to enable a consistent and transparent assessment of potential risks.

Gold Fields TSF Management Guideline

Gold Fields is committed to the safe, stable, and sustainable operation of their TSFs, and to achieve this, the Group TSF Management Guideline has been compiled to guide each operation. The Guideline also incorporates the 2016 International Council on Mining and Metals' (ICMM's) tailings position statement and a set of specific assessment criteria.

The Guideline comprises Part A and Part B;

  • A Group Level TSF Management Guideline (Part A of the document); and
  • Tailings Surveillance Program Guideline (Part B of the document)

Part A issued by Gold Fields corporate office consists of generic leading practices and principles which must be adhered to during the life cycle of all TSFs in the Group.

This part of the Guideline consists of the core directives, also known as the "17 Principles".

Part B is a leading practice surveillance guideline for mines to consider when developing or reviewing their standards and procedures for the safe operation and maintenance of TSFs.

In addition, the management and Board of Gold Fields have a comprehensive Integrated and Combined Assurance process in place, which, in the case of TSFs, consists of a minimum 3-yearly independent review of all TSFs. The review covers all operational, sustainable development, and legal aspects.