Harmony Gold completes $1.01bn takeover of Australia's MAC Copper

Harmony Gold Mining Company completed its acquisition of ASX- and NYSE-listed MAC Copper on 24 October 2025, five months after first announcing the deal. The transaction was implemented through a Jersey law scheme of arrangement, with Harmony paying US$12.25 a share for 100% of MAC's issued securities, valuing the company at roughly US$1.01bn, or about R18.4bn at the prevailing exchange rate. Harmony funded the purchase from its own cash reserves together with a US$1.25bn bridge facility.

What Harmony bought

MAC Copper's principal asset is the CSA mine near Cobar in New South Wales, a high-grade underground copper operation that gives Harmony immediate copper output rather than a project still to be built. For a company that has spent more than a century as a pure South African gold miner, the deal marks a deliberate shift towards becoming a diversified gold-and-copper producer, a strategy several of its gold-mining peers have also pursued as copper has become the metal most closely associated with the global energy transition.

Integration under way

Harmony said it would spend the following three months embedding CSA into the wider group, aligning the Australian operation with its own planning and performance systems in order to capture cost and operating synergies. The company framed the acquisition as reinforcing a long-term strategy of sustainable value creation rather than a one-off diversification bet, signalling that further copper or base-metal deals are not ruled out.

Why it matters

For South African investors, the deal is a reminder that the country's gold houses are increasingly looking offshore and beyond gold for growth, much as AngloGold Ashanti and Gold Fields have done with acquisitions outside the traditional Witwatersrand basin. It also gives Harmony a currency and jurisdictional hedge: CSA's earnings are denominated in Australian dollars and insulated from South African operational and regulatory risk, at a time when many local gold miners are managing ageing, deep-level shafts. The financing structure, mixing balance-sheet cash with a bridge facility, will be watched for how quickly Harmony moves to refinance into longer-term debt or bonds.

The bridge facility itself will be closely watched by ratings agencies, since Harmony's credit profile has historically been anchored to its South African gold operations rather than an Australian base-metal mine, and how quickly the company terms out the debt will shape views on whether further offshore acquisitions are likely.

Sources

• Harmony Gold: Harmony completes MAC Copper acquisition, securing full ownership of CSA mine and unlocking immediate copper production, 24 Oct 2025
• Mining Technology: Harmony Gold Mining completes MAC Copper acquisition, 24 Oct 2025
• Personal Finance (IOL): Harmony Gold Mining completes R18.4 billion acquisition of MAC Copper, 24 Oct 2025

Photo: Mining operations at Cobar in New South Wales, Australia, home to the CSA copper mine acquired by Harmony Gold. Axel Strauß, Wikimedia Commons, CC BY-SA 3.0.