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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)


Owners

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

Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

The deposit is a structurally controlled vein stockwork gold-silver deposit located in the Morobe Granodiorite of the Wau Graben. Gold silver mineralisation is contained in carbonate-adularia-quartzsulphide 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 dipping (Kaveroi Creek Zone) and flatlying (Hidden Valley Zone) 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 Valley and Hamata of which Hidden Valley is the largest. Both mines employ conventional open pit mining techniques with back-hoe 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 consists of 18m inter-berm heights, mined as 3m x 6m benches of 2m x 3m flitches (in ore).

Waste is disposed of in engineered valley fill waste dumps, with toes keyed in and buttressed using competent non-acid producing rock. The waste is captured in the valley fill Western Sector and Niekywe waste dumps. Underdrains and toes have been constructed and now provide sufficient capacity for the life of mine waste.


Crushing and Grinding


Processing

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

Source: Subscription required

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.

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 remainin ........

Recoveries & Grades:

CommodityParameter20192018201720162015
Gold Head Grade, g/t 1.61.361.071.511.84
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityUnits20192018201720162015
Gold oz  ......  Subscription required  ......  Subscription required95,32772,56694,601
Silver oz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required3,456 kt3,648 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required4.2 Mt
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required8,954 kt17,566 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3,062 kt4,554 kt
Subscription required - Subscription is required.

Reserves at June 30, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven 1.9 Mt Gold 0.92 g/t 56 koz
Proven 1.9 Mt Silver 19.61 g/t 1,193 koz
Probable 23.3 Mt Gold 1.62 g/t 1,215 koz
Probable 23.3 Mt Silver 32.12 g/t 24,083 koz
Proven & Probable 25.2 Mt Gold 1.57 g/t 1,271 koz
Proven & Probable 25.2 Mt Silver 31.18 g/t 25,276 koz
Measured 1.9 Mt Gold 0.92 g/t 56 koz
Measured 1.9 Mt Silver 19.61 g/t 1,193 koz
Indicated 81.7 Mt Gold 1.44 g/t 3,779 koz
Indicated 81.7 Mt Silver 27.5 g/t 72,256 koz
Inferred 3 Mt Gold 1.18 g/t 113 koz
Inferred 3 Mt Silver 29.21 g/t 2,791 koz
Total Resource 86.6 Mt Gold 1.42 g/t 3,948 koz
Total Resource 86.6 Mt Silver 27.38 g/t 76,240 koz

Commodity Production Costs:

CommodityUnits20192018201720162015
Cash costs Gold USD  ......  Subscription required 1,252 / oz 1,320 / oz 1,230 / oz
Cash costs Gold USD  ......  Subscription required†  ......  Subscription required† 1,068 / oz† 1,028 / oz† 1,065 / oz†
All-in sustaining costs (sold) Gold USD  ......  Subscription required 1,417 / oz 1,564 / oz 1,557 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 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:

Units20192018201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 62  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 272  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBIT M USD  ......  Subscription required -28  
EBITDA M USD  ......  Subscription required 26  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 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
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 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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