Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Production Start | ... |
Mine Life | 2028 |
The Hidden Valley Mine is an open-pit gold and silver operation. Hidden Valley mine consists of the Hidden Valley Kaveroi open pit and Hamata open pit located approximately 6km apart and an ore processing facility.
The Hidden Valley life-of-mine (LoM) extension project concept study / prefeasibility study considers the potential to convert both the 0.6M Au oz Kerimenge Resource and the 1.6 M Au oz remaining in the Hidden Valley Mineral Resource outside the current LoM to convert to a viable, low risk, high-margin mining operation. The project will assess the application of conventional Carbon-In-Leach and Heap Leach technologies for the Mineral Resources and investigate technologies to increase the tailings storage capacity, which is the current mine life constraint at Hidden Valley.
An extension of the mining lease and the amendment to the environmental permit will be required to continue operations beyond 2030. |
Source:
p. 135
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
- Epithermal
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 bot ........
Summary:
Mining operations are conducted across two open-pits, Hidden Valley-Kaveroi and Hamata, separated by a distance of 6km. The Hidden Valley-Kaveroi open-pit stands as the larger of the two. These mining activities follow conventional open-pit techniques, employing back-hoe excavators and rigid dump trucks as the primary load and haul equipment. Front-end loaders take charge of crusher feeding and stockpile reclamation. Additionally, smaller articulated dump trucks contribute to construction efforts and, to a lesser extent, mining operations at Hamata.
Mining bench configuration generally consists of 18m inter-berm heights, blasted in 2 x 9m benches with 3m mining flitches.
Engineered valley fill waste dumps serve as the designated disposal sites for waste. These dumps are fortified through strategic keying and buttressing with stable, non-acid forming rock. Specifically, waste generated from the Hidden Valley-Kaveroi open-pit is presently directed to the valley fill Western Sector, Niekywe, and Kaveroi Creek waste dumps. These dumps are designed to offer ample capacity throughout the mine's operational lifespan.
Hidden Valley mining is completed by conventional truck and excavator methods. Material is grade controlled through ore benches using RC drilling and sampling methods with samples analysed on site with analysed results feed into the mining model. This is followed by production drill and blasting using standard hammer drilling with down h ........
Source:
p.102,104,107
Source:
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Flow Sheet:
Summary:
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Source:
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Reserves at June 30, 2023:
Hidden Valley Gold – Mineral Resource 2023 cut-off 0.65 g/t.
Hidden Valley Silver – Mineral Resource 2023 cut-off 0.65 g/t.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
1.6 Mt
|
Gold
|
0.97 g/t
|
51 koz
|
Proven
|
1.6 Mt
|
Silver
|
21.2 g/t
|
1,109 koz
|
Probable
|
17.8 Mt
|
Gold
|
1.78 g/t
|
1,017 koz
|
Probable
|
17.6 Mt
|
Silver
|
27.82 g/t
|
15,744 koz
|
Proven & Probable
|
19.4 Mt
|
Gold
|
1.71 g/t
|
1,068 koz
|
Proven & Probable
|
19.2 Mt
|
Silver
|
27.26 g/t
|
16,853 koz
|
Measured
|
2 Mt
|
Gold
|
0.83 g/t
|
54 koz
|
Measured
|
2 Mt
|
Silver
|
17.79 g/t
|
1,145 koz
|
Indicated
|
48.2 Mt
|
Gold
|
1.48 g/t
|
2,298 koz
|
Indicated
|
46.1 Mt
|
Silver
|
21.4 g/t
|
31,756 koz
|
Inferred
|
1.1 Mt
|
Gold
|
1.19 g/t
|
43 koz
|
Inferred
|
0.9 Mt
|
Silver
|
23.33 g/t
|
685 koz
|
Total Resource
|
51.3 Mt
|
Gold
|
1.45 g/t
|
2,394 koz
|
Total Resource
|
49.1 Mt
|
Silver
|
21.29 g/t
|
33,586 koz
|
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