This information has been put together in response to the Investor Mining and Tailings Safety Initiative.
Our approach
Tailings storage facilities (“TSFs”) are a key part of our mining and processing operations and our goal is to ensure zero harm from them, as outlined in our Group Tailings Policy. Tailings management is part of our corporate risk management system and we have a structured and robust approach to the risk classification of our existing and planned TSFs. We evaluate the consequence to human and environmental health in line with the classification systems of the Australian National Committee on Large Dams (“ANCOLD”) and the Canadian Dam Association (“CDA”). We conduct regular internal and external audits to monitor, measure and evaluate the effectiveness and safety of our TSFs. The results of these audits are reported back to site, Senior Management and the Board on a regular basis.
| 1. "Tailings Dam" Name/identifier |
Houndé Mine | Ity Mine | Mana Mine | Sabadola-Massawa Mine | Lafigué | Kalana Mine | |
| 2. Location | 11°25'3.28''N, 3°32'31.40''W |
TSF 1- 6°52'36"N, 8°07'33"W |
TSF 2-8°07'33"W |
11°57'20'' N, 3°24'46'' W |
TSF 1 13o 12’ 42 N 12o11’ 53 W TSF 1B - 13o 12’ 54 N 12o7’ 61 W |
8°16'23.22"N 4°39'28.39"W |
10°48'04.89"N 8°11.5'50.91"W |
|
3. Ownership |
Owned and operated |
Owned and operated |
Owned and operated |
Owned and operated. |
Owned and operated. |
Owned and operated |
Owned |
| 4. Status | Active |
Inactive |
Active |
Active |
Active |
Active |
Inactive |
| 5. Date of initial operation |
1 November 2017 |
8 April 2019 |
June 2024 |
2008 |
March 2009 TSF 1B – June 2024 |
July 2024 |
Commence operation in 2004 and halted operation in 2017 |
| 6. Is the Dam currently operated or closed as per currently approved design? |
Currently operated in accordance with Knight Piesold (“KP”) operating manual – PE23-000624_33 TSF, WSD and WHD Operation, maintenance, and Surveillance Manua | Currently operated in accordance with Knight Piesold (“KP”) operating manual – PE23-00743_19 TSF Operating Manual. |
Currently operated in accordance with Knight Piesold (“KP”) operating manual – PE24-00900_19 TSF Operating Manual. |
Currently operated in accordance with Knight Piesold (“KP”) operating manual – PE23-00773 TSF Operating Manual. |
Currently Operated in accordance with Operations Manuals. Basis of Design ANCOLD (2019) |
Currently Operated in accordance with Operations Manuals. Basis of Design ANCOLD (2019) |
Currently under care and maintenance. Currently not closed |
| 7. Raising method | Downstream |
Downstream |
Downstream |
Stage 1 – 3 Upstream and Stage 4 Downstream. Stage 5 Modified Centre Line. Stage 6 Downstream. |
TSF 1 - Upstream TSF 1B – Downstream |
Downstream |
Upstream |
| 8. Current maximum height | Wall height varies against natural topography Average current wall height 41. 10 m. Maximum wall height is 44.9m for Cell 1 and 37.2 m for Cell 2. | Average current wall height 30.1m. Maximum height is 38.0 m at South wall. | TSF2: Maximum wall height is 20.8 m at East/ South Average wall current height is 15.5 m | Wall height varies against natural topography. Maximum current wall height 26.7m for East Cell and 24.3m for West Cell. | TSF 1 – Maximum Height 26 m TSF 1B – Average height 3 m Maximum height 11 m | Maximum Height 20.1 m |
Maximum Height 11 m |
| 9. Current Tailings storage impoundment volume | 38.8 Mt or 32.33 Mm3 (Slurry settled density 1.2 t/m3 ) | 21 Mt or 19 Mm3 @ 1.1 t/m3 | 21.3 Mt or 16.7Mm3 (Solids: 8.7Mm3 and Water: 8Mm3) | 43 Mt or 30.7 Mm3 (Slurry settled density 1.4 t/m3 ). |
TSF 1 – 60.4 Mt or 39.2 Mm3 (Slurry settled density 1.55 t/m3). TSF1B – 0.73Mt (Slurry settled density 1.16 t/m3)
|
6.0 Mt or 4.4 Mm3 (Slurry settled density 1.36 t/m3 ) | 0.64 Mt at 1.55 t/m3 |
| 10. Planned tailings storage impoundment volume in five years’ time | 50.6 Mt or 42.16 Mm3 (Slurry settled density 1.2t/m3 ). | TSF 1 = 11.2 Mt or 8.6Mm3 (Slurry settled density 1.3 t/m3 ). | TSF 2 = 37.4 Mt or 29.3 Mm3 (Slurry settled density 1.28 t/m3 | 50.8 Mt or 36.2 Mm3 (Slurry settled density 1.4 t/m3 ) | 60 Mt or 38.7 Mm3 (Slurry settled density 1.55 t/m3 ). TSF1B – 0.87 Mt (Slurry settled density 1.16 t/m3). | 28.6 Mt or 20.3 Mm3 (Slurry settled density 1.41 t/m3) |
N/A |
| 11. Most recent independent expert review | Annual EoR Review, Knight Piesold, July 2025 Dam Safe Review with SLR conducted in May 2025 |
Annual EoR Review, Knight Piesold, November 2024
|
Dam Safety Review by SLR, April 2025 2025 TSF Geotechnical External Audit, Geomino Inc – August 2025 |
Annual EoR Review, Knight Piesold, August 2025.Refer to PE25 – 01596 R20 Rev A 2025 Inspection.
|
Annual EoR Review, Knight Piesold, February 2025. |
Annual EoR Review, Knight Piesold, December 2024.
. |
Independent Audit planned for April 2024 |
| 12. Do you have full and complete relevant engineering records including design, construction, operation, maintenance and/or closure. | Yes for Stages 1-9. Stage 10 Construction in progress Operating Manual refer to PE23-000624 TSF, WSD and WHD Operation Maintenance and Surveillance Manual. |
Yes, for Stage 1 commissioned in March 2019 and for Stage 2 which was handed over in July 2020. Operating Manual refer to PE23-00743_19 TSF Operation, Maintenance, and Surveillance Manual. |
Yes
Operating Manual refer to PE23-00773 TSF Design for Construction 401-081_A3005 |
Yes Construction Reports Stage 5 completed. Refer to PE23 – 01356.
|
Yes 1. PROJECT 301012-01512 - OM-0002: Tailings Storage Facility 2. Operations Manual (Dec 2025) 3. TSF1 and TSF1B Dam Breach Assessments (Dec 2025) |
Yes, Construction Reports for Stage 2 completed |
Yes, Closure plan refer to R_Kalana Mine Closure Plan 9112006 |
| 13. What is your hazard categorisation of this facility, based on consequence of failure? |
High A (ANCOLD 2019)
|
High A (ANCOLD 2019) |
Extreme (ANCOLD 2019) |
Extreme (ANCOLD 2019) |
High A (ANCOLD 2019) |
High B (ANCOLD 2019) |
Low (ANCOLD 2019 and SANS 10286) |
| 14. What guideline do you follow for the classification system? |
Australian National Committee on Large Dams (ANCOLD 2019) Guidelines. |
Australian National Committee on Large Dams (ANCOLD 2019) Guidelines. |
Australian National Committee on Large Dams (ANCOLD 2019) Guidelines. |
Australian National Committee on Large Dams (ANCOLD 2019) Guidelines |
Australian National Committee on Large Dams (ANCOLD 2019) Guidelines |
Australian National Committee on Large Dams (ANCOLD 2019) Guidelines |
Australian National Committee on Large Dams (ANCOLD 2019) Guidelines |
| 15. Has this facility, at any point in its history, failed to be confirmed or certified as stable, or experienced notable stability concerns, as identified by an independent engineer (even if later certified as stable by the same or a different firm). |
No |
No |
No |
No |
No |
No |
No |
| 16. Do you have internal/in-house engineering specialist oversight of this facility? Or do you have external engineering support for this purpose? | External - Knight Piesold (Perth) - who have been involved with each dam embankment raise since inception. |
External - Knight Piesold (Perth)- who have been involved with each dam since inception. |
External - Knight Piesold, Perth |
External- Knight Piesold, Perth |
External - Knight Piesold, Perth |
External - Knight Piesold, Perth |
External - Knight Piesold (Denver) |
| 17. Has a formal analysis of the downstream impact on communities, ecosystems and critical infrastructure in the event of catastrophic failure been undertaken and to reflect final conditions? If so, when did this assessment take place? | Yes. Latest update, June 2025 | Yes. Latest update in 2023 |
Yes. Latest update in 2023
|
Yes. Latest update in 2023 | Yes. Latest update in 2025 |
Yes. Undertaken in 2021. |
Yes. Undertaken in 2006 contained in the Design Report by METAGO |
| 18. Is there a) a closure plan in place for this dam, and b) does it include long-term monitoring? | a) Conceptual Closure Plan, April 2023 b) Yes. Long-term monitoring is included within the post closure plan framework for the site. | a) Closure plan concept developed, Asset Reclamation Obligation 2023. Concept Mine Closure Plan ongoing. b) Yes. Long-term monitoring is included within the post closure plan framework for the site. |
Conceptual Closure plan, Asset Retirement Obligation (ARO) 2023 3rd Party Validation of Asset Retirement Obligation (ARO) conducted in Oct 25 |
a) Yes. A closure plan concept for the Mana dam was prepared (August 2025) b. Yes. Long-term monitoring is included within the post closure plan framework for the site. | a. Yes. A closure plan concept October 2022 and was submitted and approved in February 2023. b. Yes. Long-term monitoring is included within the post closure plan framework for the site | a) Initial Environmental and Social Impact Assessment (ESIA) was conducted in 2021 by La Mancha Côte d'Ivoire b. Ongoing preparation of stand alone MRCP, 2025- 2026 |
Yes, Closure plan refer to R_Kalana Mine Closure Plan 9112006 |
| 19. Have you or do you plan to assess your tailings facilities against the impact of more regular extreme weather events as a result of climate change, e.g. over the next two years? | Yes. TSF is monitored in the case of extreme weather conditions. Example 1 in 100 AEP (Annual Exceedance Probability) wet season or 72 hr flood. |
Yes. Due to location within considerable high rainfall area (average >1.5m pa), TSF is monitored with respect to catchment and wet season runoff from surrounding landscape. |
Yes. Freeboard volume more than sufficient to contain PMP. |
Yes. Freeboard volume more than sufficient to contain PMP. |
Yes. Freeboard volume more than sufficient to contain PMP |
Yes. Freeboard volume more than sufficient to contain PMP |
Yes, climate change study in progress, outcomes of which will inform AEP assessment by the Engineer of Record. |
|
20. Any other relevant information and supporting documentation. Please state if you have omitted any other exposure to tailings facilities through any joint ventures you may have. |
Dam has a clay lining and a HDPE liner. |
Dam has a clay lining and a HDPE liner. |
Dam has a clay lining and a HDPE liner. |
3 rd Party Independent Review completed in 2023. Dam Safety Review carried out in 2025. Refer to Mana TSF DSR Report There are monitoring bores around the dam and 37 no. Vibrating Wire Piezometers in the tailings. | Upstream Dam. There are monitoring bores and piezometers at the downstream of the embankment. |
Dam has a clay lining and a HDPE liner. |
|
Sustainability Report 2025
Read about our ESG strategy and the significant sustainability milestones reached in 2025.
Explore detailed ESG metrics and performance data in our 2025 ESG Data Centre.
World Gold Council Indaba Speech
Our CEO, Ian Cockerill, delivered a keynote speech at the World Gold Council reception during the African Mining Indaba 2026 touching on the importance of responsible mining and transparent supply chains.
So the choice is clear, we can treat these shifts as pressure, or as the catalyst to modernise our industry for the next generation; and that means responsible mining, transparent supply chains and digitally trusted gold. That is how we build an industry that is not only profitable — but legitimate, resilient, and future-ready, and something that we can all be proud of.