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Papua New Guinea
Hidden Valley Mine

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 Location:
87 km SW from Lae, Papua New Guinea

  Regional Office:
PO Box 4015, Morobe Province
Lae
Papua New Guinea
411
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Counter current decantation (CCD)
  • Concentrate leach
  • Carbon in leach (CIL)
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life4 years (as of Jan 1, 2020)
In addition to a planned mine life of 4 years, a prefeasibility study for the life-of-mine extension has been completed which considers a two- to three-year mine life extension and annual gold production of approximately 190 000oz. This study has now progressed to feasibility stage, with study work expected to be completed during FY21.


Owners

Source: p. 129
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. 100 % Indirect
The mine is 100% owned and managed by Harmony through Morobe Consolidated Goldfields.

Deposit Type

  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

The deposit is a structurally controlled vein-stockwork gold-silver deposit located in the Morobe Granodiorite of the Wau Graben. Goldsilver mineralisation is contained in carbonate-adularia- quartz-sulphide vein-stockworks and in a few instances in hydrothermal breccias. Discrete zones of intense stockwork fracture and mineralised veining comprise individual lodes. At the Hidden Valley deposit, gold and silver are related to steeply to moderately dipping sheeted vein swarms associated with an underlying shallow thrust.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining operations occur in two open pits 6km apart, Hidden ValleyKaveroi and Hamata of which Hidden Valley-Kaveroi is the largest. Both mines employ conventional open pit mining techniques with backhoe excavators and rigid dump trucks as the primary load and haul equipment. Front-end loaders are used for crusher feed and stockpile reclaim. A number of articulated smaller dump trucks are used for construction and to a lesser extent mining in Hamata.

Mining bench configuration generally consists of 18m inter-berm heights, blasted in 2m x 9m benches with 3m mining flitches.

Waste is disposed of in engineered valley fill waste dumps, with toes keyed in and buttressed using competent non-acid forming rock. Waste from the Hidden Valley-Kaveroi open pit is currently placed in the valley fill Western Sector and Niekywe waste dumps. A new dump, the Kaveroi Creek dump, will be built this year which, in combination with the current Western Sector dump, will provide full life of mine capacity for waste material, as well as capacity for potential extensions.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
SAG mill 1

Summary:

A crushing facility is located near the Hidden Valley pit with the crushed ore conveyed via a 3.8km long overland pipe conveyor. Ore from the Hamata pit is trucked to the Hamata crushing station, located next to the ore processing plant.


Processing

  • Gravity separation
  • Counter current decantation (CCD)
  • Concentrate leach
  • Carbon in leach (CIL)
  • Merrill–Crowe
  • Cyanide (reagent)

Source: Subscription required

Summary:

The Hidden Valley process plant was designed to treat nominally 4.1Mtpa of gold/silver bearing ore. The process uses a two stage crushing circuit followed by a SAG mill, gravity, CCD/Merrill Crowe circuit for silver and a carbon-in-leach circuit for the gold. A silver/gold ore bar is produced and flown off site for refining and sale.

Tailings are disposed of in a terrestrial tailings storage facility located to the south-west of the process plant. Dam-wall construction of the tailings storage facility is ongoing and largely constitutes placement of suitable oxide and fresh competent material sourced from mining in the Hamata pit and nearby quarry. The processing inventory in this ore reserve estimate is constrained by the remaining storage capacity. The Hidden Valley Extension study contemplates construction of an additional facility, TSF2.

Recoveries & Grades:

CommodityParameter202020192018201720162015
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required1.361.071.511.84
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required86.586.6

Production:

CommodityUnits2021202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required92,01595,32772,56694,601
Silver oz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required3,886 kt2,499 kt2,889 kt3,456 kt3,648 kt
Annual processing capacity  ......  Subscription required4 Mt4 Mt4.2 Mt4.2 Mt
Total tonnes mined  ......  Subscription required8,954 kt17,566 kt
Ore tonnes mined  ......  Subscription required3,062 kt4,554 kt
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Hidden Valley 2020 cut-off 0.85 g/t.

CategoryTonnage CommodityGradeContained Metal
Proven 2.3 Mt Gold 1.32 g/t 98 koz
Proven 2.3 Mt Silver 27.37 g/t 2,029 koz
Probable 14.5 Mt Gold 1.61 g/t 749 koz
Probable 14.2 Mt Silver 24.83 g/t 11,314 koz
Proven & Probable 16.8 Mt Gold 1.57 g/t 847 koz
Proven & Probable 16.5 Mt Silver 25.18 g/t 13,343 koz
Measured 2.3 Mt Gold 1.32 g/t 93 koz
Measured 2.3 Mt Silver 27.37 g/t 2,029 koz
Indicated 61.9 Mt Gold 1.53 g/t 3,053 koz
Indicated 60 Mt Silver 23.29 g/t 44,917 koz
Inferred 1.5 Mt Gold 1.08 g/t 50 koz
Inferred 1.3 Mt Silver 19.92 g/t 808 koz
Total Resource 65.7 Mt Gold 1.52 g/t 3,201 koz
Total Resource 63.6 Mt Silver 23.37 g/t 47,754 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs Gold USD 824 / oz 1,252 / oz 1,320 / oz 1,230 / oz
Cash costs Gold USD  ......  Subscription required†  ......  Subscription required† 669 / oz† 1,068 / oz† 1,028 / oz† 1,065 / oz†
All-in sustaining costs (sold) Gold USD 1,261 / oz 1,417 / oz 1,564 / oz 1,557 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 1,094 / oz† 1,241 / oz† 1,282 / oz† 1,395 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units20172016
Total operating costs ($/t milled) USD 3339

Financials:

Units2021202020192018201720162015
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required122   98   10   62  
Revenue M USD  ......  Subscription required  ......  Subscription required32   110   216   272  
Gross profit M USD  ......  Subscription required  ......  Subscription required14   14  
EBIT M USD -18   -28  
EBITDA M USD 6   26  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Integrated Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Form 20-F 2017
Integrated Report 2017
Other 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Corporate Presentation 2016
Year-end Mineral Reserves 2016
Fact Sheet 2015
Fact Sheet 2009
Form 20-F 2009
Subscription required - Subscription is required.

Aerial view:

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