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Free State surface operations


Harmony and the Cyanide Code

Harmony is a signatory to the International Cyanide Management Code for the manufacture, transport and use of cyanide in producing gold (the Cyanide Code). This voluntary industry code was developed by the United Nations Environment Programme and the International Council on Mining and Metals. All of our major gold mining operations and most of our metallurgical plants have been certified as compliant.

The group also acts in compliance with the other exchanges on which it is listed, as well as the United States Securities and Exchange Commission (SEC) and the Public Company Accounting Reform and Investor Protection Act of 2002 (more commonly known as the Sarbanes-Oxley Act of 2002 (SOx)) as applicable to foreign companies listed in the United States.

  • Seven of our plants are certified in terms of the Cyanide Code – the Harmony One, Central, Target, Joel, Kusasalethu, Doornkop and Hidden Valley plants
  • At Kalgold a cyanide detox plant was commissioned in July 2015 when the Kalgold plant began to deposit tailings into the D-Zone open pit as part of Kalgold's open pit closure strategy. The cyanide detox plant will reduce cyanide concentrations in the tailings to acceptable levels. Test work is underway to ensure we achieve the desired levels. Cyanide concentration levels are monitored at the detox plant, along the tailings and return water pipeline route and at the point of discharge into the pit. The Kalgold plant is to re-register with the International Cyanide Management Institute once cyanide concentrations meet the institute's requirements.
  • The Phoenix retreatment operation (Saaiplaas plant) was voluntarily deregistered following an external audit, which confirmed that there was a problem with weak acid dissociable cyanide concentrations in the tailings. The plant's process does not allow for decreases in cyanide dosages as this results in reduced gold recovery and we are therefore unable to reduce the weak acid dissociable concentration of cyanide leaving the plant.
  • The Hidden Valley plant received its Cyanide Code compliance certificate in FY14. Since commissioning of the process plant at Hidden Valley in FY10, monitoring has shown that cyanide concentrations at the Nauti Village compliance point (as stipulated in the permit) are in line with environmental permit limits.

Harmony used 18 000t of cyanide during FY16 (FY15: 14 300t). The increase in cyanide consumption was largely due to the increased volume of tonnes treated in FY16 –18.1Mt compared to 18.9Mt in FY15. The corresponding intensity usage is 0.97t cyanide/t treated for FY16 (FY15: 0.79t cyanide/t treated).

For further information, please see the integrated annual report.

Investor brief

Harmony Investor brief, May 2016
Harmony Investor brief -
May/July 2016

(PDF - 1.7MB)

Annual report

Integrated annual report 2016
Integrated annual report 2016


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