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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
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Fax+61 7 3320 3740
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
Production Start...
Mine Life5 years (as of Jan 1, 2022)
Hidden Valley extension project in Papua New Guinea will be self-funded and will extend the life-of-mine to 2027. The company expects the project to deliver approximately 160 000oz to 200 000oz of gold per annum and 2.1Moz to 3.1Moz of silver per annum at a life of mine all-in sustaining cost of US$1 150/oz.

On 5 January 2022, the overland conveyor belt was damaged, resulting in the plant not being able to process ore for an extended period.


Owners

Source: p. 24
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. 100 % Indirect
Morobe Consolidated Goldfields Ltd. (operator) 100 % Direct
Morobe Consolidated Goldfields Limited, being a wholly owned subsidiary of Harmony registered in Papua New Guinea, is the 100% owner and operator of the Hidden Valley Mine.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Breccia pipe / Stockwork
  • Hydrothermal


Summary:

The Hidden Valley Kaveroi deposit is a vein-stockwork gold-silver deposit located in the southeast corner of the Wau Graben and is hosted by the Morobe Granodiorite. The Kaindi Metamorphics occur as a cap to the Hidden Valley Kaveroi Mineralisation. It comprises grey-black and green-brown, variably carbonaceous, schistose, quartz-rich psammites and pelites that have undergone regional greenschist metamorphism and localised, higher grade contact metamorphism on intrusive contacts with Morobe Granodiorite. The granodiorite comprises two parts; an upper homogenous granodiorite of uniform texture cut by thin aplite dykes and feldspar porphyry dykes. Below the Hidden Valley Kaveroi fault is a lower, more heterogeneous unit comprising granodiorite, diorite, adamellite, tonalite and feldspar porphyry. The lower unit tends to contain gypsum veining, not regularly seen in the upper unit. 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. Numerous porphyry dykes of the Eddie Creek Suite intrude both the Kaindi Metamor ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Hidden Valley consists of the Hidden Valley Kaveroi open pit ("HVK") and Hamata open pit. Hidden Valley is an open pit gold-silver operation, operating conventional truck/excavator open pits and an ore-processing plant. Two separate open pits are currently in operation; the HVK pit and the Hamata pit. The HVK pit is the larger pit supplying the majority of the ore and is located some 6km from the processing plant. Hamata ore is predominately exhausted and is used for Tailings dam wall construction material. Mining operations 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 mining in Hamata. Mining bench configuration consists of 18m inter-berm heights, mined as 2 x 9m benches or 3 x 3m flitches (typically in ore). Mining bench configuration generally consists of 18m inter-berm heights, blasted in 2m x 9m benches with 3m mining flitches. Waste is disposed in engineered valley fill waste dumps, with toes keyed in and buttressed using competent non-acid producing rock. The construction of the Neikwiye valley toe buttress and underdrain network was completed in the 2018 fiscal year and waste rock will be disposed in this dump envelope through the remainder of the mine life. Similarly under drain construction and toe buttress will be completed in the Kav ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required92,01595,32772,566
Silver oz  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required3,886 kt2,499 kt2,889 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required4 Mt4 Mt4.2 Mt
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at June 30, 2022:
Hidden Valley Gold – Mineral Resource 2022 cut-off 0.65 g/t.

Hidden Valley Silver – Mineral Resource 2022 cut-off 0.65 g/t.

CategoryTonnage CommodityGradeContained Metal
Proven 2.5 Mt Gold 0.8 g/t 70 koz
Proven 2.5 Mt Silver 18.32 g/t 1,501 koz
Probable 16.6 Mt Gold 1.75 g/t 943 koz
Probable 16.3 Mt Silver 22.45 g/t 11,758 koz
Proven & Probable 19.1 Mt Gold 1.65 g/t 1,014 koz
Proven & Probable 18.8 Mt Silver 21.89 g/t 13,259 koz
Measured 2.5 Mt Gold 0.86 g/t 70 koz
Measured 2.5 Mt Silver 18.32 g/t 1,501 koz
Indicated 51.2 Mt Gold 1.5 g/t 2,462 koz
Indicated 49.3 Mt Silver 22.13 g/t 35,058 koz
Inferred 1.4 Mt Gold 1.25 g/t 57 koz
Inferred 1.2 Mt Silver 23.12 g/t 917 koz
Total Resource 55.1 Mt Gold 1.46 g/t 2,589 koz
Total Resource 53.1 Mt Silver 21.97 g/t 37,475 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs Gold USD 824 / oz   1,252 / oz   1,320 / oz  
Cash costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 669 / oz†   1,068 / oz†   1,028 / oz†  
All-in sustaining costs (sold) Gold USD 1,261 / oz   1,417 / oz   1,564 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,094 / oz†   1,241 / oz†   1,282 / oz†  
† Net of By-Product.
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Operating Costs:

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

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M ZAR  ......  Subscription required
Capital expenditures M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 122  USD 98  USD
Revenue M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 32  USD 110  USD
Gross profit M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 14  USD 14  USD
EBIT M
EBITDA M
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Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 26, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
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 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... 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
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