Hidden Valley Mine

Morobe Province, Papua New Guinea

Tailings containment represents a milestone in the over 80 years of Papua New Guinea (PNG) large-scale mining history and is the culmination of over 30 years of work in PNG by Klohn Crippen Berger. The mine owners made a major decision to be the first large-scale mine to contain total mill tailings. Previously PNG was thought to be unsuited to construction of a stable tailings impoundment, which is a requirement of modern mine waste disposal due to its seismic instability and high rainfall. Achieving tailings containment marks an historic achievement in socially and environmentally sustainable mining practices in PNG, whose rich mineral resources account for a major portion of their GDP.

Sustainable features of the project included the exclusive use of mine waste for the dam construction. Construction was completed with a work force of almost 90% Papua New Guineans. Much of the construction labour force were hired from the local villages and trained on heavy mining equipment.


  • Tailings containment
  • Construction monitoring
  • Environmental remediation
  • Geotechnical investigation
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