Hidden Valley is located in the highly prospective Morobe province in Papua New Guinea, approximately 300 kilometres north-west of the nation’s capital, Port Moresby, and 90 kilometres south-west of the sea port of Lae.
The operation is owned by the Hidden Valley Joint Venture (HVJV), one of three unincorporated joint ventures between subsidiaries of Newcrest (50 per cent) and Harmony Gold Mining Company Limited of South Africa (50 per cent), formed in 2008 and referred to collectively as the Morobe Mining Joint Ventures (MMJV).
Hidden Valley is an open pit gold and silver mine, consisting of three main lodes – Hidden Valley, Kaveroi and Hamata. Gold and silver doré produced at Hidden Valley is transported to the Perth Mint in Australia to be refined.
Construction of the Hidden Valley mine began in 2007 and commercial production commenced in September 2010.
In the financial year ending 30 June 2015, Hidden Valley produced 189,202 ounces of gold and 1,785,676 ounces of silver (100 per cent basis).
The mine sits within the New Guinea Mobile Belt of Papua New Guinea which is one of the world’s pre-eminent geological terrains for porphyry copper-gold and epithermal gold mineralisation. The belt is host to several world-class deposits. The Hidden Valley - Wau corridor is a world class historic mining district with exploration upside.
Hidden Valley is predominantly a fly-in-fly-out operation with about 1,000 employees and 1,600 contractors.
Hidden Valley is located in a high rainfall area at an altitude of around 2,000 metres. Several permanent streams contribute to significant water run-off from the site, so water quality, soil stabilisation, waste management, and containment of tailings are closely monitored.
Water used in the process plant is recycled which reduces the amount of fresh water required from local water sources.
The construction of a 4.5 kilometre overhead conveyor to carry ore to the mill further lessens the impact of the mine on the natural environment, by reducing the need for trucks and haul roads.
The Hidden Valley mine operates in accordance with a Memorandum of Agreement (MoA) with local landowners and government, which sets out a preference for employment of landowners and local residents ahead of those from other provinces and offshore employees when qualifications are equivalent.
For more information, download the Hidden Valley fact sheet or the latest Newcrest Sustainability Report, or visit the Morobe Mining website.