Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longitudinal stoping
- Alimak
- Transverse stoping
- Cemented paste backfill
|
Production Start | ... |
Mine Life | 2030 |
Hemlo Mine was transitioned to a fully underground operation in 2020.
New open pit production permitted and commencing at Hemlo in the second half of 2025, allowing three years for permitting and two years for pre-stripping prior to first ore production in 2027. |
Source:
p. 160
Barrick Gold owns 100% of the Hemlo.
Contractors
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Deposit Type
- Orogenic
- Breccia pipe / Stockwork
Summary:
Muir (2002) interprets the Hemlo deposit to be an atypical, mesozonal-orogenic, disseminated-replacement-stockwork deposit, broadly synchronous with D2 and “middle” stage granitoid plutonism, prior to or synchronous with peak regional metamorphism, and involving magmatic ± metamorphic fluids.
The Hemlo deposit is approximately three kilometres long by two kilometres deep and averages 20 m wide with a very small surface expression.
Mineral Reserves at the Williams Mine are currently grouped into two main areas: the B Zone and C Zone. The A Zone has been mined out. The A and B Zones are geologically the same continuous zone, with the B Zone being the down-plunge westerly extension of the A Zone, which sub-cropped at surface. The B Zone is further divided into the main zone and footwall zone. The C Zone represents multiple sub-parallel lenses of irregular, generally narrow, gold mineralization. C Zone mineralization is stratigraphically different from the main zone and occurs in two broad geological domains, the porphyritic felsic metavolcanics (Moose Lake porphyry) and the intermediate to felsic volcaniclastic sediment unit. Interlake is the down dip extension of the C Zone.
The B Zone extends to a depth of at least 1,300 m below surface and has a strike length of approximately 1,200 m. Main Zone mineralization occurs at or near the contact with the hanging wall sediments in a strongly feldspathized rock unit. The zone dips at 60° to 70° to the northeast and plunges to ........
Mining Methods
- Longitudinal stoping
- Alimak
- Transverse stoping
- Cemented paste backfill
Summary:
Hemlo has produced more than 21 million ounces of gold and has been operating continuously for more than 30 years. It consists of the Williams mine — an underground and open pit operation —located about 350 kilometers east of Thunder Bay, Ontario.
Hemlo, which transitioned to a fully underground operation during 2020, remains firmly on track to becoming a Tier Two asset. A new underground portal is currently under development to access the Upper C Zone, with mining expected to start in the second half of 2021. Improving flexibility with a third mining front at Hemlo will allow underground throughput to ramp-up to a steady state of 1.9 million tonnes per annum from 2022 onwards.
The Hemlo open pit mine was a typical truck and loader/hydraulic shovel operation. The pit design was based on 10 m bench heights.
The underground mine at Williams is accessed via a vertical shaft equipped to move personnel and material, and also ore and waste from the underground to the surface. The Williams Mine is equipped with a 4.6 m diameter double drum hoist with 22 t capacity skips and a 3.7 m diameter service hoist with cage and counterweight.
Two stoping methods are utilized at the Williams Mine, including the longhole and Alimak methods. Longhole “Longitudinal” stopes are typically 20 m to 25 m high and 15 m to 20 m along strike, with an average ore width of three to eight metres. Longhole “Transverse” stopes are between 15 m to 20 m along the ........
Source:
Source:
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Flow Sheet:
Summary:
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Source:
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Reserves at December 31, 2022:
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
0.5 Mt
|
Gold
|
4.93 g/t
|
0.079 M oz
|
Probable
|
23 Mt
|
Gold
|
2.19 g/t
|
1.6 M oz
|
Proven & Probable
|
23 Mt
|
Gold
|
2.25 g/t
|
1.7 M oz
|
Measured
|
0.72 Mt
|
Gold
|
5.11 g/t
|
0.12 M oz
|
Indicated
|
52 Mt
|
Gold
|
2.09 g/t
|
3.5 M oz
|
Measured & Indicated
|
52.72 Mt
|
Gold
|
2.12 g/t
|
3.6 M oz
|
Inferred
|
5.4 Mt
|
Gold
|
3.3 g/t
|
0.58 M oz
|
HME Type | Model | Size | Quantity | Leased or Contractor | Ref. Date | Source |
ANFO Loader
|
.......................
|
|
.......................
|
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Apr 25, 2017
|
p.113
|
Backhoe
|
.......................
|
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.......................
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Apr 25, 2017
|
p.102
|
Bolter
|
.......................
|
|
.......................
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Apr 25, 2017
|
p.113
|
Bolter
|
.......................
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|
.......................
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Apr 25, 2017
|
p.113
|
Cable bolter
|
.......................
|
|
.......................
|
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Apr 25, 2017
|
p.113
|
Dozer (crawler)
|
.......................
|
|
.......................
|
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Apr 25, 2017
|
p.102
|
Dozer (crawler)
|
.......................
|
|
.......................
|
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Apr 25, 2017
|
p.102
|
Dozer (crawler)
|
.......................
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|
.......................
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Apr 25, 2017
|
p.102
|
Drill
|
.......................
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.......................
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Apr 25, 2017
|
p.105
|
Drill
|
.......................
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6.75 inch
|
.......................
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Apr 25, 2017
|
p.98,102
|
Drill
|
.......................
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.......................
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Apr 25, 2017
|
p.102
|
Drill
|
.......................
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|
.......................
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Apr 25, 2017
|
p.113
|
Drill (long hole)
|
.......................
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|
.......................
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Apr 25, 2017
|
p.113
|
Drill (long hole)
|
.......................
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.......................
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Jun 18, 2020
|
|
Drill jumbo (two boom)
|
.......................
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|
.......................
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Apr 25, 2017
|
p.113
|
Excavator
|
.......................
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.......................
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Apr 25, 2017
|
p.102
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Excavator
|
.......................
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.......................
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Apr 25, 2017
|
p.102
|
Excavator
|
.......................
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|
.......................
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Apr 25, 2017
|
p.102
|
Grader
|
.......................
|
|
.......................
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Apr 25, 2017
|
p.102
|
Grader
|
.......................
|
|
.......................
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Apr 25, 2017
|
p.102
|
Grader
|
.......................
|
|
.......................
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Apr 25, 2017
|
p.102
|
Grader
|
.......................
|
|
.......................
|
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Apr 25, 2017
|
p.102
|
Grader
|
.......................
|
|
.......................
|
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Apr 25, 2017
|
p.113
|
Jumbo
|
.......................
|
|
.......................
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Apr 25, 2017
|
p.102
|
Loader
|
.......................
|
|
.......................
|
|
Apr 25, 2017
|
p.102
|
Loader
|
.......................
|
|
.......................
|
|
Apr 25, 2017
|
p.102
|
Loader (FEL)
|
.......................
|
|
.......................
|
|
Apr 25, 2017
|
p.102
|
Load-Haul-Dump (LHD)
|
.......................
|
9 cu. yd
|
.......................
|
|
Apr 25, 2017
|
p.113
|
Load-Haul-Dump (LHD)
|
.......................
|
7 cu. yd
|
.......................
|
|
Apr 25, 2017
|
p.113
|
Load-Haul-Dump (LHD)
|
.......................
|
7 cu. yd
|
.......................
|
|
Apr 25, 2017
|
p.113
|
Load-Haul-Dump (LHD)
|
|
2 cu. yd
|
.......................
|
|
Apr 25, 2017
|
p.113
|
Rockbreaker
|
|
|
.......................
|
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Apr 25, 2017
|
p.113
|
Scissor Lift
|
|
|
.......................
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Apr 25, 2017
|
p.113
|
Scissor Lift
|
.......................
|
|
.......................
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Apr 25, 2017
|
p.113
|
Scoop Tram
|
.......................
|
|
|
|
Sep 14, 2018
|
p.1
|
Trans Mixer
|
.......................
|
|
.......................
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Apr 25, 2017
|
p.113
|
Truck (boom)
|
.......................
|
|
.......................
|
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Apr 25, 2017
|
p.113
|
Truck (fuel / lube)
|
.......................
|
|
.......................
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Apr 25, 2017
|
p.113
|
Truck (haul)
|
.......................
|
|
.......................
|
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Apr 25, 2017
|
p.102
|
Truck (haul)
|
.......................
|
|
.......................
|
|
Apr 25, 2017
|
p.102
|
Truck (underground)
|
.......................
|
26 t
|
.......................
|
|
Apr 25, 2017
|
p.113
|
Truck (underground)
|
.......................
|
|
.......................
|
|
Jun 18, 2020
|
|
Truck (underground)
|
.......................
|
30 t
|
.......................
|
|
Apr 25, 2017
|
p.113
|
Truck (underground)
|
.......................
|
40 t
|
.......................
|
|
Apr 25, 2017
|
p.113
|
Truck (water)
|
.......................
|
|
.......................
|
|
Apr 25, 2017
|
p.102
|
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