Newmont Halts Operations at Massive Cadia Gold Mine After 4.5 Magnitude Earthquake Strikes New South Wales

Newmont halts underground work at Australia's Cadia gold mine following a 4.5 magnitude earthquake. Shares fell 4% as safety inspections continue.

By: AXL Media

Published: Apr 16, 2026, 10:05 AM EDT

Source: Information for this report was sourced from MINING.COM

Seismic Activity Triggers Immediate Safety Protocol

Newmont Corporation has taken the preemptive step of halting all underground operations at the Cadia gold mine following a 4.5 magnitude earthquake in New South Wales. The seismic event, which occurred late on April 14, was followed by two distinct aftershocks that continued into Wednesday morning. According to company officials, the immediate safety protocols were successful, resulting in all underground workers being accounted for and returned to the surface without injury. Management has categorized the activity as light to moderate, yet the decision to suspend work remains in place while the site is secured.

Technical Inspections of Underground Infrastructure

The current priority for Newmont involves a comprehensive assessment of the site's structural integrity before any personnel are allowed to return to the sub-surface levels. Specialist technical teams have been deployed to inspect the vast network of underground infrastructure at Cadia, looking for potential damage caused by the tremors. This assessment is a critical prerequisite for the resumption of mining activities, as the company must ensure that no foundational shifts have compromised the safety of the working environment. Until these specialist evaluations are finalized, the timing for a full operational restart remains undetermined.

Market Reaction and Valuation Fluctuations

Investors responded to the operational halt with a sharp sell-off, causing Newmont’s shares to decline by 4.4% in early New York trading on Wednesday. The stock was last seen trading at $114.09, reflecting a loss of value compared to Tuesday’s market close. This dip has adjusted the company’s total market capitalization to approximately $125 billion. The volatility in share price highlights the market's sensitivity to disruptions at tier-one assets, particularly when natural disasters introduce unpredictable variables into corporate guidance.