Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 2034 |
The Haile Operation is Haile open pit operation and an Haile UG - Horseshoe underground mine currently in development.
Following the approval of an early works program in September 2022, the Supplemental Environment Impact Statement (SEIS) Final Record of Decision and subsequent operating permits were received in December 2022 which completed the permitting requirements for underground mine development and commencement of the surface operating footprint expansion to allow for additional waste containment facilities and tailings storage capacity.
First ore from Haile underground remains on track for delivery to the mill in the fourth quarter of 2023. |
Source:
p. 11,26
The Haile Gold Mine is 100% owned and operated by OceanaGold. Haile Gold Mine Inc. (HGM) is a wholly owned subsidiary of OceanaGold Corporation (OceanaGold).
Contractors
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Deposit Type
- Breccia pipe / Stockwork
- Sediment-hosted
- Vein / narrow vein
Summary:
The Haile district consists of nine gold deposits within a 3.5 km by 1 km area. Haile occurs within a variably deformed ENE-trending structural zone at or near the contact between metamorphosed Neoproterozoic volcanic and sedimentary rocks. Haile is hosted in laminated siltstones and minor volcanic rocks of the Upper Persimmon Fork Formation and is dissected by barren NNW-striking diabase dikes. Deformation includes brittle and ductile styles with ENE-trending foliation, faults, brecciation, and isoclinal folds.
Foliation intensity increases along sedimentary-volcanic contacts and is strongest in the laminated siltstones where gold mineralization is best developed. Gold-pyrite-silica-rich fluids were preferentially precipitated in more permeable and structurally deformed metasediments. Gold mineralization also occurs in intrusive and volcanic rocks adjacent to faults and shear zones.
The Haile gold deposits occur within a 5 km long by 1.5 km wide ENE-trending structural corridor. Northwest-dipping ore zones dip 30 to 500NW and include the Champion, Small, Mill Zone, Chase, Ledbetter, Red Hill and Snake deposits. Both northwest- and southeast-dipping ore zones occur in the Palomino and Horseshoe deposits along the southeast edge of the district. ENE-striking, 40-600NW-dipping faults focus high-grade zones > 3 g/t Au.
Mineralisation and Alteration
Haile gold mineralization occurs as an en-echelon 5 km long by 1.5 km wide cluster of ........
Summary:
Haile is being mined using conventional open pit methods and OceanaGold plans to continue with current mining methods. The material encountered at Haile is a combination of soft (Costal Plains Sands [CPS] and saprolite) and hard (metavolcanics and metasediments) rock units.
CPS is loosely consolidated sand which can be mined without the need for drilling and blasting. Mineralization is not present in CPS thus drilling for the purposes of ore control and waste classification is not necessary. Saprolite is mined without blasting where possible. Saprolite is sampled for waste classification to meet the requirements in Haile’s Overburden Management Plan (OMP).
Drilling and blasting are required in all hard rock. Drilling and blasting are performed on 10 m benches. Multiple bit sizes (115 mm, 171 mm, 200 mm) are used depending on material type and application. Blast hole depth is 10 m plus subdrill; subdrill ranges from 1.4 m to 1.9 m.
The number of samples taken per blasthole is material-type dependent. Blastholes in waste are typically sampled twice on 5m intervals (top half and bottom half). Blastholes in ore are typically sampled three times at 3.3 m sample intervals.
Flitch height is variable. Waste is typically mined on a 10 m flitch and ore is typically mined on a 3.3 m flitch. Ore is usually mined with hydraulic backhoe excavators, while the majority of waste is mined with hydraulic shovels. Front-end loaders may be used in eith ........
Source:
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Flow Sheet:
Summary:
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Production:
| Commodity | Units | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Gold
|
koz
| ...... ^ | ...... | ...... | ...... | ...... | 132 | 118 |
|
Silver
|
koz
| | ...... | ...... | ...... | ...... | ...... | ...... |
All production numbers are expressed as metal in doré.
^ Guidance / Forecast.
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Operational Metrics:
| Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Total tonnes mined
| ...... | ...... | ...... | 24,947 kt | | |
|
Ore tonnes mined
| ...... | ...... | ...... | 3,217 kt | 2,780 kt | 2,710,469 t |
|
Waste
| ...... | ...... | ...... | 21,730 kt | 13,913 kt | 16,475,134 t |
|
Tonnes milled
| ...... | ...... | ...... | 3,204 kt | 2,392 kt | 1,836,086 t |
|
Plant annual capacity
| ...... | ...... | ...... | | | 3 Mt |
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Reserves at December 31, 2022:
Mineral Reserves: Open Pit, the primary cut-off grade is 0.5 g/t Au while oxide material is assigned a 0.6 g/t Au cut-off grade. For Haile Underground, the cut-off is 1.72 g/t Au, with adjacent lower grade stopes included in the reserves based on an incremental stope cut-off grade of 1.56 g/t Au.
Mineral Resource: OP primary cut-off 0.45 g/t Au, oxide cut-off 0.55 g/t Au. Palomino Resources at a 1.49 g/t Au cut off and Horseshoe Resources at a 1.37 g/t Au cut-off.
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Proven & Probable
|
In-Situ (OP)
|
40.5 Mt
|
Gold
|
1.56 g/t
|
2.03 M oz
|
|
Proven & Probable
|
In-Situ (UG)
|
3.4 Mt
|
Gold
|
3.91 g/t
|
0.42 M oz
|
|
Proven & Probable
|
Total
|
43.8 Mt
|
Gold
|
1.74 g/t
|
2.45 M oz
|
|
Proven & Probable
|
In-Situ (OP)
|
40.5 Mt
|
Silver
|
2.3 g/t
|
3 M oz
|
|
Measured & Indicated
|
In-Situ (OP)
|
42.9 Mt
|
Gold
|
1.51 g/t
|
2.09 M oz
|
|
Measured & Indicated
|
In-Situ (UG)
|
7 Mt
|
Gold
|
3.97 g/t
|
0.9 M oz
|
|
Measured & Indicated
|
Total
|
49.9 Mt
|
Gold
|
1.86 g/t
|
2.98 M oz
|
|
Measured & Indicated
|
In-Situ (OP)
|
42.9 Mt
|
Silver
|
2.4 g/t
|
3.3 M oz
|
|
Inferred
|
In-Situ (OP)
|
4 Mt
|
Gold
|
0.9 g/t
|
0.1 M oz
|
|
Inferred
|
In-Situ (UG)
|
4.8 Mt
|
Gold
|
3.9 g/t
|
0.6 M oz
|
|
Inferred
|
Total
|
9 Mt
|
Gold
|
2.6 g/t
|
0.7 M oz
|
|
Inferred
|
In-Situ (OP)
|
4 Mt
|
Silver
|
2.3 g/t
|
0.3 M oz
|
Source:
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Corporate Filings & Presentations:
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