Newmont and the mining industry are facing continued geotechnical, geothermal and hydrogeological challenges due to the older age of certain of our mines and a trend toward mining of more complex deposits, the use of deeper and larger pits and the use of deep, bulk or selective underground mining techniques. This leads to higher pit walls, more complex underground environments and increased exposure to geotechnical instability and geothermal and hydrogeological impacts. As our operations are maturing, the open pits at many of our sites are getting deeper and we have experienced geotechnical failures (such as pit wall and slope failures) at some of our mines, including, without limitation, at our operations in Australia, Ghana, Peru, Canada, Colorado and at NGM, in Nevada. See also the risk factor under the heading "
Mining companies are increasingly required to consider and provide benefits to the communities and countries in which they operate in order to maintain operations ".
Additionally, there are a number of risks and uncertainties associated with the block cave mining methods applied at Cadia, in New South Wales, Australia. These risks include a cave not propagating as anticipated, excessive air gaps forming during the cave propagation, unplanned ground movement occurring due to changes in stresses released in the surrounding rock and larger or more frequent mining-induced seismicity than anticipated. Additionally, during cave establishment and propagation, higher levels of seismic activity, and higher likelihood of damage to excavations from seismic events, are expected. This has been observed during the cave establishment phase of Cadia's PC2-3 project and is expected during the establishment of Cadia's PC1-2 project in the coming years. Such seismic events and associated damage may require changes to the mining plan and upgrades to ground support systems, which could take several months. Large seismic events may also occur after cave establishment and propagation and during steady state caving, although the likelihood of this is lower. Excessive water ingress, disturbance and the presence of fine materials may also give rise to unplanned releases of material of varying properties and of water through drawbells. Cadia recorded sudden unplanned releases of both dry fine ore material and wet mud material through drawbells in 2023.
In addition, there are a number of risks and uncertainties associated with the application of techniques used in the civil engineering industry for the stabilization of steep open pit slopes by Newmont at Lihir, which is located in Papua New Guinea. These risks include variation to technical models when compared to actual conditions, performance of reinforcement system in hot ground and delays with the execution of the civil works due to lack of experience with these techniques. The success of our operations depends, in part, on implementing engineering solutions to particular geotechnical, hydrogeological and geothermal conditions. For example, underground operations, large vertical shafts need to be excavated in order to provide ventilation to the underground environment, and sometimes these shafts are excavated using unsupported techniques such as raiseboring, whereby the walls of the shafts cannot be supported until the excavation is completed. If adverse and unexpected geotechnical and hydrogeological conditions are encountered, the shaft walls may become unstable. To prevent this type of incident occurring, thorough geotechnical and hydrogeological investigations and stability assessments are required and, if needed, alternate excavation locations or techniques need to be implemented. One such shaft wall failure incident occurred at Cadia in 2022, resulting in the need to abandon and backfill a shaft shortly after the completion of excavation to prevent further unravelling of the shaft wall and potential interruptions to other operations.
Operations may also experience challenges to operating conditions, such as inundation, inrush of water or other materials, airblast and those relating to elevated temperatures (including management and discharge of hot water encountered in the underground workings). These risks could result in damage to, or destruction of, mineral properties, production facilities, equipment or other properties, personal injury or death of employees or third parties, environmental damage, community outrage, delays in mining, increased production costs, monetary losses and possible legal liability. Our operations are also subject to risks associated with a natural disaster, which include risk of tsunami, wildfires, mine flooding, geysers and outbursts, cyclones, avalanches and landslides. In addition, seismic activity may impact operations that are located in seismically active areas and subject to risks of earthquakes, such as Cadia and, as regards the related risks of tidal surge and tsunamis, Lihir. For instance, a large seismic event in 2017 impacted Cadia resulting in a temporary suspension of operations. Seismic activity has also been experienced at our Éléonore mine. Additionally, our Lihir operation is located within the Luise Caldera of the Luise Volcano which is located on the east coast of the Aniolam Island. The caldera is geothermally active in the form of hot springs and fumaroles.
Adverse geotechnical, geothermal and hydrogeological conditions, including surface or underground fires, floods, droughts, geysers and outbursts, coastal erosion and landslides, avalanches, cyclones and pit wall failures, can be difficult to predict. Such conditions are often affected by risks and hazards outside of our control, such as severe weather and considerable rainfall, which may lead to periodic floods, mudslides, wall instability and seismic activity, which may result in slippage of material. Such events may not be detected in advance.
In addition, Newmont has both operational (active and inactive) and closed tailings storage facilities ("TSFs") in a variety of climatic and geographic settings. Annually, Newmont manages and disposes more than 150 million tonnes of milled rock slurry, referred to as tailings, that are placed within engineered, surface containment facilities, or placed as structural backfill paste in underground mines (e.g., Éléonore, Porcupine), or managed subaqueously in-lake (i.e., Brucejack) or disposed of using deep sea tailings placement (i.e., Lihir). Newmont has experienced seepage and/or localized instability at TSFs which required us to re-evaluate our emergency response systems and make modifications to our TSFs. Issues with TSFs, such as instability, failure and/or seepage could occur in the future, and Newmont conducts detailed risk assessments considering potential failure modes to support understanding and development of risk mitigation measures in accordance with the As Low As Reasonably Practicable principle. The failure of a TSF embankment or a water storage dam at one of our mine sites could cause severe, and in some cases catastrophic, property and environmental damage and loss of life. For example, in early 2019, the extractive industry experienced a large-scale tailings dam failure at an unaffiliated mine in Brazil, which resulted in numerous fatalities and caused extensive property, environmental and reputational damage. Recognizing this risk, Newmont continues to review and refine our existing practices and, as a member of the International Council on Mining & Metals ("ICMM"), commits to implementation of the GISTM. Work is underway to bring all TSFs in our portfolio to substantial conformance with the GISTM by August 2025, and no assurance can be given that conformance will be achieved by such deadline. Conformance with the GISTM as well as improved understanding of our tailings risks and requisite mitigation remains on-going and has and may continue to result in increases to our estimated sustaining costs and closure costs for existing tailings facilities. Despite these efforts, no assurance can be given that TSF failure events will not occur in the future.
A geotechnical failure of a TSF, dam, or pit slope could result in limited or restricted access to mine sites, suspension of operations, government investigations, regulatory actions or penalties, increased monitoring costs, remediation costs and other impacts, which could result in a material adverse effect on our results of operations and financial position. For example, in December 2023 the Company temporarily suspended its processing operations at Telfer in Western Australia after cracking and sinkholes were detected on an internal embankment of the site's TSF.
A failure to safely resolve any unexpected problems relating to these conditions at a commercially reasonable cost may result in damage to infrastructure or equipment or injury to personnel and may adversely impact the Company's operating results and financial position. See also the risk factors under the heading "
We may experience increased costs or losses resulting from the hazards and uncertainties associated with mining " and "Damage to our reputation may result in decreased investor confidence, challenges in maintaining positive community relations and can pose additional obstacles to our ability to develop our projects, which may result in a material adverse impact on our business, financial position, results of operations and growth prospects
Our operations are subject to extensive environmental laws and regulations.
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