On September 14, BHP Billiton declined 3.74% in regular trading, trading at $83.52/share, with turnover of $38.24 million. The stock extended its pre-market losses as multiple headwinds converged on the mining sector.

On the news front, persistent uncertainty over US copper tariff policy continued to weigh heavily on copper-related equities. The White House has yet to decide whether to impose tariffs on refined copper imports, as the administration weighs supporting domestic copper production against the risk of higher manufacturing costs and consumer burden. Copper prices retreated sharply after briefly hitting a record high of $14,533/ton on the LME, intensifying bearish sentiment across the sector. Additionally, BHP's Port Hedland wage negotiations remain unresolved after unions rejected the company's proposed 16% cumulative pay increase over four years, with a Fair Work Commission meeting scheduled for September 15.

The broader Diversified Metals and Mining sector declined broadly, with HudBay Minerals down 6.43%, Rio Tinto down 3.25%, and Almonty Industries down 2.94%.

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