The South32 Ltd (ASX: S32) share price is in focus today after the company reported a substantial 61% jump in Sierra Gorda's ore reserve estimate, extending the mine's reserve life to 2045.
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What did South32 report?
- Ore reserve at Sierra Gorda increased by 61% to 1,100 million tonnes at 0.39% total copper, 0.016% molybdenum, and 0.06 g/t gold (as at 31 July 2026).
- Mineral resource estimate rose 8% to 1,870 million tonnes at 0.37% total copper, 0.016% molybdenum, and 0.06 g/t gold.
- Reserve life extended by about five years, now expected until 2045.
- Expansion follows successful infill drilling—around 85,000 metres drilled between 2023 and 2025.
- Fourth grinding line project approved, projected to boost copper production by around 30% from 2031.
What else do investors need to know?
The Sierra Gorda copper mine, in which South32 holds a 45% stake, is a large, open pit operation in northern Chile. This major jump in ore reserves and resources comes after significant drilling to better define the orebody, providing more certainty over future production.
July's approval for a fourth grinding line is expected to increase annual processing capacity from 135,000 to 165,000 tonnes per day by 2031. The mine is already well-equipped with modern processing infrastructure, renewable energy, and seawater supply, helping support these plans.
Exploration is underway at the Catabela Northeast zone, where early drilling results suggest more copper resources could be uncovered—potentially providing further mine life extensions in the future.
What did South32 management say?
South32 Chief Executive Officer, Matt Daley said:
This update highlights the scale, quality and long-life orebody at Sierra Gorda, which we expect will be a significant source of copper for decades to come. It follows the approval in July to proceed with execution of the fourth grinding line project at Sierra Gorda, which is expected to increase copper production by approximately 30 per cent from 2031.
With the current orebody remaining open at depth, the mine offers potential for further growth beyond today's increase to ore reserve and reserve life. We continue to work with our joint venture partner to drive further growth and value at Sierra Gorda. This includes the Catabela Northeast exploration project, where exploration holes have intersected significant copper mineralisation, highlighting the potential for future mine life extension.
What's next for South32?
South32 is focused on ramping up development at Sierra Gorda, progressing the fourth grinding line project and ongoing infill and exploration drilling. With the orebody remaining open at depth and encouraging early drilling outside current reserves, investors can expect continued efforts to grow resources and sustain the mine's future.
The company is also progressing environmental permit approvals to cover operations beyond 2035, aiming for a seamless transition to an extended mine life. Management highlights Sierra Gorda's role as a cornerstone copper asset as global demand for key energy transition minerals rises.
South32 share price snapshot
The South32 share price has smashed the S&P/ASX 200 index (ASX: S32) over the past 12 months with a gain of over 70%.
