Surface mining in Papua New Guinea continues to unlock minerals in abundance, driving exports, regional development and workforce growth.
Every day across numerous sites in Papua New Guinea (PNG), some of the world’s toughest machines crawl across the rims of vast open pits. They carve out gold, copper, and other minerals from landscapes that have helped shape the nation’s modern economy.
These operations showcase the scale and precision of surface mining, a method that has become synonymous with PNG’s largest and most productive mines.
From the high-altitude benches of Ok Tedi to the geothermal heat of Lihir and the twin pits of Hidden Valley, surface mining has long proven its ability to unlock some of the country’s most technically challenging orebodies. It is a form of mining that combines engineering ambition, long-term investment and, in PNG, a deep commitment to maintainingx local partnerships.
As PNG continues to develop its world-class mineral endowment, surface mining remains central to national growth, driving exports, regional development and innovation across the industry.
Surface mining has been central to PNG’s minerals sector since large-scale commercial extraction began, and it remains the dominant method for the country’s biggest gold and copper producers.
PNG’s geology, characterised by extensive porphyry copper systems and large epithermal gold deposits, lends itself naturally to open-pit mining, allowing operators to access wide, near-surface ore zones efficiently and at scale.
Over time, surface mining has shaped the structure of PNG’s entire industry. Major operations have been developed using conventional truck-and-shovel open-pit methods, supported by robust processing infrastructure and significant investment in haulage, geotechnical work and dewatering systems. These mines have established PNG as a reliable producer of high-value commodities, attracting long-term international operators and fostering deep local supply chains.
Surface mining also plays an important role in workforce development, particularly in remote regions where large open-pit projects anchor training programs, logistics networks and community partnerships. With ongoing exploration activity across several provinces and operators continuing to optimise pit designs and processing capacities, surface mining remains an economic mainstay and a strategic driver of the country’s mining future.
That’s particularly true for several of PNG’s most significant mines. While their geology, scale and operating conditions differ, Ok Tedi, Lihir, Hidden Valley, Porgera and Simberi share a common thread: they demonstrate how open-pit mining continues to power the country’s minerals sector.
1. Ok Tedi: High-altitude productivity
Located in the Star Mountains of Western Province, Ok Tedi is one of PNG’s longest-running and most recognisable open-pit copper-gold mines. Its high-altitude setting, steep terrain and heavy rainfall demand careful geotechnical planning and disciplined pit management, yet the operation has consistently delivered strong production throughout its multi-decade life.
Ok Tedi’s ongoing investments in haulage efficiency, pit wall stability and resource optimisation have helped maintain output while also supporting hundreds of local jobs and contracting opportunities. The mine remains a major source of copper concentrate for export markets, contributing significantly to PNG’s foreign-exchange earnings.
2. Lihir: Engineering resilience on a volcanic island
Situated on Aniolam Island in New Ireland Province, Lihir is one of the world’s largest gold deposits and a standout example of engineering innovation within an open-pit environment. The orebody sits within a geothermal system, with elevated temperatures requiring specialised mining approaches and continuous monitoring.
According to a recent site-specific technical report, the operation’s open-pit reserves are defined by mining assumptions tailored to these unique conditions, underscoring the complexity of the project. Under its operator Newmont, Lihir continues to invest in pit optimisation, plant upgrades and long-term planning initiatives designed to sustain production and enhance reliability.
3. Hidden Valley: Partnership-driven production
The Hidden Valley gold-silver mine in Morobe Province is operated through the Morobe Mining joint venture and features two established open pits: Hidden Valley–Kaveroi and Hamata. Although not as large as Ok Tedi or Lihir, the mine plays a vital role in the regional economy and has steadily improved performance through targeted investment in grade control, waste movement and fleet utilisation.
Continued refinement of pit sequences and processing efficiency has enabled Hidden Valley to remain a reliable source of gold and silver production, supporting provincial development and national export totals.
4. Simberi: Island-based open-pit mining
Located in the Tabar Islands of New Ireland Province, Simberi is another open-pit gold operation that has consistently contributed to PNG’s mining output. The site consists of several satellite pits across the island and uses a conventional truck-and-shovel mining method, supported by a modern processing facility.
Operator St Barbara, which is in the midst of an expansion program on the site, is hopeful of a lease extension that will see it continue operations until 2034.
5. Porgera: High-grade gold in rugged terrain
The Porgera joint venture, located in Enga Province, is one of PNG’s highest-grade gold mines and a flagship open-pit operation. Set in steep, mountainous terrain, the site presents significant geotechnical and logistical challenges, which operator New Porgera has addressed through meticulous pit design and robust safety systems.
The mine produces gold and silver concentrates. Continuous investment in haulage efficiency, processing optimisation and community engagement has allowed the operation to maintain consistent output since its production restart at the end of 2023.
Taken together, PNG’s surface mines represent a substantial share of the nation’s export earnings, with gold and copper consistently among the country’s top revenue-generating commodities. But even beyond direct exports, these mines create broad economic benefits through wages, procurement, infrastructure investment, and the development of skilled workforces.
That’s a situation likely to continue well into the future, with several emerging projects expected to carry on the surface mining tradition. The Woodlark gold project, currently being advanced by Geopacific Resources, is one of the most promising: its 2025 drilling campaign has targeted near-surface gold mineralisation at key prospects such as Little MacKenzie, Wayai Creek, Boscalo North and Great Northern. All results so far are consistent with a planned open-pit mining approach, and Geopacific has the added certainty of a recent lease extension.
Meanwhile, at Wild Dog in New Britain, Great Pacific Gold has expanded its drilling program after early results from the Sinivit structure showed very high-grade gold and copper. This includes several zones close to surface, suggesting potential for open-pit extraction. The company is integrating advanced techniques, including light detection and radar to better define geological structures.
On a larger scale, the Frieda River copper-gold project remains one of the most significant potential future surface mines in PNG. The development plan is based on three large open pits at the Horse-Ivaal-Trukai-Ekwai-Koki deposits, with ore processed via conventional methods and waste managed in a secure engineered facility.
Surface mining is set to remain the backbone of PNG’s mineral sector now and well into the future, proven by decades of successful operations and ongoing innovation.
With established giants like Ok Tedi and Lihir continuing to perform and promising new projects such as Woodlark, Wild Dog and Frieda River advancing toward development, the future of open-pit mining in PNG looks secure.
These projects necessarily combine technological progress, geological opportunity, and wider community engagement. As PNG navigates evolving challenges, this form of mining is set to continue unlocking the country’s mineral wealth, while supporting sustainable economic growth for generations to come.
