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Hidden Valley

Hidden Valley is a gold and silver mine located in the Morobe Province of Papua New Guinea. The operation is situated in the rugged highlands of the country, approximately 220 km north-west of Port Moresby. The mine is operated as a joint venture, with Harmony Gold Mining having held an interest in the asset alongside other partners. Hidden Valley comprises both open-pit and underground mining operations, extracting ore from multiple deposits within the tenement area. The mine processes ore through a conventional crushing, grinding and flotation circuit to produce a gold–silver doré and a copper–gold concentrate. Production commenced in 2010 following the completion of construction and commissioning of the processing plant. The operation has been a significant contributor to Papua New Guinea's mineral exports and to the local economy through employment and community development programmes. Hidden Valley's ore reserves and resources have supported a multi-decade mine life, though production levels and operational performance have varied with commodity prices and technical challenges. The mine operates under Papua New Guinea's mining regulatory framework and maintains environmental and social management systems in line with international standards.

Hidden Valley Updates


Harmony reports strong third-quarter results, on track to meet full-year guidance
Harmony reports strong third-quarter results, on track to meet full-year guidance
18th May 2026 By: Sabrina Jardim

JSE-listed Harmony Gold has delivered a solid operating performance for the nine months to March 31, reflecting an excellent third quarter with improvements across all key operational metrics. In... 


Harmony Gold CEO Beyers Nel (right) interviewed by Mining Weekly's Martin Creamer.
Harmony studying high-margin surface gold projects in Free State and West Wits
27th March 2026 By: Martin Creamer

Harmony Gold Mining Company is progressing studies to recover the gold from its Free State tailings dams as well as those that span the West Wits area around its Mponeng gold mine. The Johannesburg... 


Rio Tinto to earn up to 80% in PNG copper/gold targets
23rd March 2026 By: Creamer Media Reporter

ASX-listed junior LCL Resources has agreed a farm-in and joint venture agreement with Rio Tinto over its Ono project in Papua New Guinea (PNG), unlocking up to A$48-million in exploration funding... 


Harmony Gold CEO Beyers Nel (right) interviewed by Mining Weekly's Martin Creamer.
Harmony studying high-margin surface gold projects in Free State and West Wits
12th March 2026 By: Martin Creamer

Harmony Gold Mining Company is progressing studies to recover the gold from its Free State tailings dams as well as those that span the West Wits area around its Mponeng gold mine. The Johannesburg... 


Harmony Gold CEO Beyers Nel.
Strong cash generation enabling Harmony to fund a future in both gold and copper
11th March 2026 By: Martin Creamer

South Africa’s largest gold-mining company Harmony Gold is building a resilient portfolio by investing continuously in its orebodies while growing in copper to protect cash flows through the... 


Beyers Nel
Harmony on track to meet full-year guidance; higher gold prices boosts cash flow
3rd February 2026 By: Sabrina Jardim

Gold and copper producer Harmony Gold Mining Company has announced that it expects to report a solid financial performance for the six-month period ended December 31, 2025, supported by elevated... 


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