On July 30, BHP Billiton rose 3.43% in regular trading, trading at $86.1/share, with turnover of $29.29 million. The rally was driven by sector-wide strength following peer Rio Tinto's earnings release on July 29, which showed surging profits underpinned by robust copper business performance.

Rio Tinto's strong copper-driven results triggered broad gains across the diversified metals and mining sector. BHP Billiton, as one of the world's largest copper producers, benefited from additional positive sentiment surrounding its recently approved Escondida copper mine expansion in Chile. The project, valued at approximately $14.7 billion, received environmental assessment approval for early-stage works worth around $1.3 billion, including sulfide leaching and electricity upgrades. Within the sector, Teck Resources rose 6.78%, MP Materials gained 4.93%, Rio Tinto advanced 3.95%, and HudBay Minerals climbed 2.37%, reflecting significant sector linkage.

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