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Hidden Valley

Our operations

Hidden Valley

The Hidden Valley mine is an open pit gold and silver mine, situated in the highly prospective area of the Morobe Province in Papua New Guinea, some 210 kilometres northwest of Port Moresby. The major gold and silver deposits of the Morobe goldfield and Hidden Valley are hosted in the Wau Graben. The Hidden Valley-Kaveroi and Hamata pits, located approximately 6 kilometres apart, are in operation. Ore mined is treated at the Hidden Valley processing plant.

Performance FY16

During FY16, Hidden Valley's operations were impacted by accident-related stoppages during the first quarter of FY16. The operation was also adversely affected by poor grade and road closures.

Mining at Kaveroi stage 4 ceased in the fourth quarter of FY16 although milling was sustained by the processing of the lower-grade stockpile and the start of ore production at Hamata. Overall this led to lower tonnages of ore mined and milled.

More detailed information on safety performance can be found in the Integrated annual report.

Key statistics

    FY16 FY15 FY14
Number of employees        
Total (including employees of Morobe Mining Joint Ventures)   1 969 2 157 1 980
Operational        
Volumes milled (000t) (metric) 1 729 1 825 2 001
  (000t) (imperial) 1 906 2 012 2 207
Gold produced (kg) 2 257 2 943 3 292
  (oz) 72 565 94 619 105 840
Gold sold (kg) 2 340 3 003 3 307
  (oz) 75 233 96 548 106 322
Grade (g/t) 1.31 1.61 1.65
  (oz/t) 0.038 0.047 0.048
Financial        
Revenue (Rm) 1 320 1 346 1 434
  (US$m) 91 118 138
Average gold price received (R/kg) 564 272 448 322 433 488
  (US$/oz) 1 210 1 218 1 303
Cash operating cost (Rm) 1 082 1 153 1 086
  (US$m) 75 101 105
Production profit/(loss) (Rm) 108 203 344
  (US$m) 7 18 33
Capital expenditure (Rm) 79 121 122
  (US$m) 5 11 12
Cash operating cost (R/kg) 479 196 391 774 329 943
  (US$/oz) 1 028 1 065 991
All-in sustaining cost (R/kg) 597 398 514 690 415 068
  (US$/oz) 1 282 1 395 1 244
Safety        
Number of fatalities   1 1 0
Lost-time injury frequency rate per million hours worked   1.39 4.20 0.00
Environment        
Electricity consumption (GWh) 54 48 42
Water consumption – primary activities (ML) 715 722 768
Greenhouse gas emissions (000t CO2e) 55 0 0
Intensity data per tonne treated        
– energy   0.03 0.03 0.02
– water   0.41 0.39 0.38
– greenhouse gas emissions   0.03 0 0
Number of reportable environmental incidents   0 0 1
Other salient features  
Status of operation Open-pit mining operation producing gold and silver. A joint venture with Newcrest
Life of mine ± 7 years
Compliance and certification Mining lease approved by Papua New Guinea authorities; Cyanide Code

Mineral reserves as at 30 June 2016

  Proved reserves Probable reserves Total mineral reserves
Reserves (metric) Tonnes
(Mt)
Grade
(g/t)
Gold
(000kg)
Tonnes
(Mt)
Grade
(g/t)
Gold
(000kg)
Tonnes
(Mt)
Grade
(g/t)
Gold
(000kg)
  1.3 1.09 1 11.5 1.62 19 12.7 1.57 20
Reserves (imperial) Tons
(Mt)
Grade
(oz/t)
Gold
(000oz)
Tons
(Mt)
Grade
(oz/t)
Gold
(000oz)
Tons
(Mt)
Grade
(oz/t)
Gold
(000oz)
  1.4 0.032 47 12.6 0.047 599 140 0.046 644

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Annual report

Integrated annual report 2016
Integrated annual report 2016

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Investor brief

Harmony Investor brief, November 2016
Harmony Investor brief -
November 2016

(PDF - 2MB)