Newmont Cuts 2026 Gold Output Guidance After Flooding Forces Suspension at Boddington

May 21, 2026 — Newmont Corporation, the world's largest gold producer by annual output, has reduced its full-year 2026 production guidance after severe flooding at its Boddington open-pit operation in Western Australia forced a temporary but significant suspension of mining activities. The company disclosed the guidance revision in a regulatory filing late Wednesday, citing exceptional rainfall events in the region that have inundated critical haul roads and disrupted ore processing at the site.

Scale of the Disruption

Newmont now expects full-year attributable gold production of approximately 5.8 million troy ounces, down from prior guidance of 5.88 million ounces — a reduction of roughly 80,000 ounces, or about 1.4 percent of projected output. The company said Boddington, which typically contributes between 700,000 and 750,000 ounces annually and ranks among the highest-volume gold mines in the Southern Hemisphere, will remain partially offline for an estimated three to four weeks while crews clear debris, assess infrastructure integrity, and restore drainage across affected pit sections.

Boddington is an open-pit, open-cut operation that mines gold and copper from a large, low-grade ore body in the Darling Range southeast of Perth. Its scale and low strip ratio have made it one of Newmont's most cost-efficient assets, with all-in sustaining costs typically running well below the company average. A multi-week suspension at a mine of this output profile carries material consequences for quarterly production metrics, and analysts following the stock moved swiftly to trim near-term earnings models on Thursday morning.

Market Context and Supply Implications

The timing of the disruption is notable. Global gold mine supply has been running broadly in line with expectations through the first quarter of 2026, with major producers in Nevada, Ghana, and Canada largely meeting output targets. Boddington's suspension introduces a meaningful, if temporary, gap in supply that arrives at a moment when above-ground physical inventories at London Bullion Market Association vaults are already reported to be tighter than at any point since late 2022.

Refined gold deliverable to the London market draws substantially on Australian production, and any supply interruption at a top-tier producing mine in that country tends to attract attention from spot traders managing loco London positions. On Thursday, the gold lease rate for one-month borrowing edged higher, a signal that physical availability is being watched closely even if the headline impact of the Boddington suspension on global annual supply is modest in percentage terms.

Independent mining analysts note that weather-related disruptions of this kind are becoming more frequent at open-pit operations in regions exposed to intensifying seasonal rainfall patterns. Western Australia's southwest experienced its third wettest May on record through the first three weeks of the month, according to the Bureau of Meteorology.

Newmont's Response and Broader Guidance

In its filing, Newmont stated that all personnel at Boddington have been accounted for and that no injuries were reported. The company said it is activating contingency plans to partially offset the output shortfall by accelerating ore processing at its Tanami underground operation in the Northern Territory, where available milling capacity exists ahead of a planned maintenance window scheduled for the third quarter.

All-in sustaining cost guidance for the full year was left unchanged at $1,475 to $1,575 per ounce, as the incremental costs of remediation and catch-up processing are expected to be absorbed within existing operational budgets. Newmont's copper by-product credits from Boddington's ore, which have helped suppress net gold production costs in recent quarters amid elevated copper prices, will also be reduced during the suspension period.

Sector Takeaway

The Boddington disruption is unlikely to move the needle significantly on annual global gold mine supply, which runs at approximately 3,600 tonnes per year. But it serves as a timely reminder that production guidance from even the most operationally stable miners carries execution risk, and that weather-related force majeure events are a recurring, if underpriced, consideration for investors modeling supply-side inputs to precious metals prices.

Sarah Mitchell is Senior Markets Analyst at LiveMetalPrice.com. This article is for informational purposes only and does not constitute investment advice.