Overview
Stage | Construction |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Sub-level open stoping (SLOS)
- Cemented paste backfill
|
Mine Life | 9 years (as of Jan 1, 2021) |
Havieron is an exciting underground gold-copper development project in the Paterson region of Western Australia, one of the leading frontiers for the discovery of world-class precious and base metals deposits.
Early works commenced in January 2021 and are now significantly advanced, including development of the underground main access decline through 80% of the total depth to the top of the Havieron ore body. A Pre-Feasibility Study was completed in October 2021, and an updated Feasibility Study is currently progressing.
The ore from Havieron is expected will be processed at the Telfer mining facility, located 45 km west of Havieron (subject to a positive feasibility study, mining decision and payment processing agreement). |
Source:
p. 8
Havieron is entirely contained within mining tenement M45/1287, which is owned by the Havieron Joint Venture participants, being Greatland Pty Ltd (Greatland) and Newcrest, a wholly owned subsidiary of Newmont Corporation (Newmont). Newcrest has previously entered into a Joint Venture Agreement (effective 30 November 2020) and Farm-In Agreement (effective 12 March 2019) with Greatland and Greatland Gold plc. Newcrest is the manager of the Havieron Joint Venture and holds a 70% interest (Greatland holds a 30% interest).
Contractors
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Deposit Type
- Breccia pipe / Stockwork
- Vein / narrow vein
- Replacement
- Intrusion related
Summary:
Havieron is located within the north-western exposure of the Palaeo-Proterozoic to Neoproterozoic Paterson Orogen (formerly Paterson Province), 45 km east of the Telfer mine. The Yeneena Supergroup hosts the Havieron prospect and consists of a 9km thick sequence of marine sedimentary rocks and is entirely overlain by approximately 420m of Phanerozoic sediments of the Paterson Formation and Quaternary aeolian sediments.
The geology model defines several mineralised zones, including a Crescent Zone (containing the sulphide rich material in the area named the "South East Crescent Zone") and several Breccia types (Cemented Breccia (CB) and Crackle Breccia (CBX)), and several unmineralised zones (Dolerite Dyke, Calc-silicate country rocks, Permian sequence and Cover). In addition, a new sulphide rich Zone, the "Link Zone" has been defined in the lower sections of the mineral system (3750 - 4000mRL). These zones are based on grouped primary logging domain codes interpreted from drill cores, mineralogical logs and assay data. Greatland has incorporated much of the previously reported Actinolite Breccia (ACB) zone into its CB and CBX zones on the bases of their similarity of spatial grade distributions and geometries, and absence of sharp contrasts in gold and copper grades between them.
The Havieron deposit comprises an ovoid shaped zone of variable brecciation, alteration and sulphide mineralisation (the Breccia Pipe). The mineralisation trends northwest to s ........
Mining Methods
- Sub-level open stoping (SLOS)
- Cemented paste backfill
Summary:
The Havieron Pre-Feasibility Study defined a SLOS mining method with paste fill and truck ore haulage at a 2 Mtpa mining rate.
The Study demonstrates the potential to expand the Project and increase the mining rate to 3Mtpa or more based on the conversion of the current Inferred Mineral Resources and additional potential Mineral Resource growth from immediately below the Crescent Zone.
SLOS is a large-scale open stoping method that is conducted over multiple levels at once. Once the stope has been mined out it is backfilled with paste to maintain the overall stability of the opening and enable mining of adjacent stopes. This method is typically applied to strong orebodies that require minimal support and are surrounded by strong country rock, such as the Havieron deposit. Stopes are mined in a checkerboard fashion with all primary stopes first, followed by the intermediate secondary stopes. The mining sequence is top down overall, divided into a number of different lifts separated by horizontal sill levels which are recovered after the upper and lower level have been mined and filled.
A sub-level spacing of 50m with sill drill levels located 20m below each mining front was selected. Some sub-level spacings are increased to 60m to accommodate the inclusion of ore and minimising additional level development. The design consists of nine semi-independent mining sequences, based on both horizontal and vertical mining fronts. The horizontal fronts a ........
Flow Sheet:
Summary:
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Source:
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Projected Production:
Commodity | Product | Units | Avg. Annual | LOM |
Gold
|
Metal in conc./ doré
|
koz
| 160 | 1,432 |
Copper
|
Metal in concentrate
|
kt
| ...... | ...... |
Operational Metrics:
Metrics | |
Annual ore mining rate
| ...... |
Ore tonnes mined, LOM
| ...... |
* According to 2021 study.
Reserves at December 21, 2023:
Mineral Resources in the South East Crescent and Link Zone are reported within a A$80 NSR/t shell while Mineral Resources in the Breccias are reported within a A$50 NSR/t shell.
Category | Tonnage | Commodity | Grade | Contained Metal |
Indicated
|
50 Mt
|
Gold
|
2.6 g/t
|
4.1 M oz
|
Indicated
|
50 Mt
|
Copper
|
0.33 %
|
168 kt
|
Indicated
|
50 Mt
|
Gold Equivalent
|
3.1 g/t
|
5 M oz
|
Inferred
|
81 Mt
|
Gold
|
1.1 g/t
|
2.9 M oz
|
Inferred
|
81 Mt
|
Copper
|
0.13 %
|
107 kt
|
Inferred
|
81 Mt
|
Gold Equivalent
|
1.3 g/t
|
3.4 M oz
|
Total Resource
|
131 Mt
|
Gold
|
1.7 g/t
|
7 M oz
|
Total Resource
|
131 Mt
|
Copper
|
0.21 %
|
275 kt
|
Total Resource
|
131 Mt
|
Gold Equivalent
|
2 g/t
|
8.4 M oz
|
Commodity Production Costs:
| Commodity | Units | Average |
All-in sustaining costs (sold)
|
Gold
|
USD
|
......
|
Assumed price
|
Copper
|
USD
|
......
|
Assumed price
|
Gold
|
USD
|
......
|
* According to 2021 study / presentation.
Operating Costs:
| Units | 2021 |
Total operating costs ($/t milled)
|
AUD
| 112 * |
* According to 2021 study.
2021 Study Costs and Valuation Metrics :
Metrics | Units | LOM Total |
Pre-Production capital costs
|
$M AUD
|
......
|
After-tax Cash Flow (LOM)
|
$M AUD
|
......
|
After-tax NPV @ 4.5%
|
$M AUD
|
......
|
After-tax IRR, %
|
|
......
|
After-tax payback period, years
|
|
......
|
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