Overview
| Stage | Production |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Underhand stoping
- Longhole open stoping
- Paste backfill
|
| Production Start | ...  |
| Mine Life | 2033 |
Following the October 30, 2020 seismic event and a sizeable ground fall, production in various areas of the Westwood mine was suspended. Following completion of the actions identified in the investigation, mining operations were re-authorized, contingent on the continued application of changes identified in the investigation, and underground operations in the East Zone recommenced in June 2021. |
Source:
p. 53
The Westwood mine are held 100% by the IAMGOLD Corp.
Contractors
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Deposit Type
- VMS
- Vein / narrow vein
- Intrusion related
Summary:
The origin of the gold in the Doyon-Bousquet-Laronde (DBL) mining camp has been extensively debated in the past and three models have been proposed: synvolcanic, multi-stage, and syn-deformation. Recent and current studies of the Laronde-Penna deposit, Westwood ore zones, and Mooshla intrusion mineralisation, combined with the geological synthesis of the DBL mining camp (Mercier-Langevin et al., 2009), have provided further insights into the synvolcanic model for the introduction of the gold.
Five deposit and occurrence styles are recognized in this camp: 1) gold-rich base metal massive sulphide lenses (Laronde-Penna, Bousquet 2-Dumagami and Warrenmac lens), 2) gold-rich vein stockworks and sulphide disseminations (Bousquet 1, Westwood and Ellison);, 3) intrusion-related Au-Cu sulphide-rich vein systems (Doyon, Mooshla-A), 4) shear-hosted Au-Cu-sulphide-rich veins (Mouska and MicMac) and 5) syn-deformation auriferous quartz-pyrite-tourmaline veins (Mooshla-B).
On the Westwood project, Zone 2 Extension mineralisation share similarities with the Doyon mine intrusion-related veins system while the Warrenmac-Westwood Corridor may be related with the volcanogenic massive sulphide lenses of the Laronde-Penna and Bousquet 2-Dumagami mines. The North Corridor mineralisation shows hybrid characteristics between the two previous corridors.
Excluding the Doyon Mine area, mineralisation in the Westwood deposit consists of multiple horizons grouped in thre ........
Mining Methods
- Underhand stoping
- Longhole open stoping
- Paste backfill
Summary:
Development is classified as either deferred (infrastructure) development, including ramps, crosscuts and ore passes. Most of the lateral developments are mechanized, with jumbos, rockbolters, scissorlifts and 2.7m3 LHD units. Dimensions for waste drifts are generally 4.5m high and 4.1m wide. Drift dimensions in the ore lenses may vary locally according to the dip, width of the vein and mining method selected; planned drifts dimensions are 4.5m high and 4.5m wide for long hole drifts. Track drifts have been developed with wheeled long-tom crews: other than Level 840 (originally an exploration drift), dimensions are 2.9m high and 2.8m wide. No upcoming track drifts development work is out lined in the plan.
Arched backs are promoted for lateral development to enhance ground stability. Ground support varies significantly depending on the expected ground conditions and combination of static ground supports (rebars), yielding supports (hybrid bolts, debonded cables), long anchors (cables) and dynamic supports are used to control the wide spectrum of ground conditions experienced. In additions, mesh panels, straps and shotcrete are used either individually or conjointly as surface support. Ongoing monitoring of the ground support performance or possible deterioration are achieved by doing routinely workplace inspections. New ground support technologies are currently been trialled at the mine to optimize the performance of the ground support and to reduce exposure to po ........
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Flow Sheet:
Summary:
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Reserves at December 31, 2021:
Westwood Mineral Reserves have been estimated using a $1,200/oz gold price and Mineral Resources using a 5.5 g/t Au cut-off grade over a minimum width of 2.4 metres, using a $1,200/oz gold price. The Grand Duc Mineral Reserves and Resources estimates are included in the Westwood Mineral Reserves and Resources estimates, and have been estimated using a gold price of $1,350/oz for Mineral Reserves and a gold price of $1,500/oz for Mineral Resources.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
500 kt
|
Gold
|
6.9 g/t
|
111 koz
|
|
Probable
|
4,079 kt
|
Gold
|
4.2 g/t
|
548 koz
|
|
Proven & Probable
|
4,579 kt
|
Gold
|
4.5 g/t
|
659 koz
|
|
Measured
|
1,039 kt
|
Gold
|
11.3 g/t
|
377 koz
|
|
Indicated
|
6,568 kt
|
Gold
|
6 g/t
|
1,262 koz
|
|
Inferred
|
5,970 kt
|
Gold
|
9.2 g/t
|
1,764 koz
|
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