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 studying high-margin surface gold projects in Free State and West Wits 
By: Martin Creamer 12th March 2026 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... →
Strong cash generation enabling Harmony to fund a future in both gold and copper
By: Martin Creamer 11th March 2026 South Africa’s largest gold-mining company Harmony Gold is building a resilient portfolio by investing continuously in its orebodies while growing... →
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