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Canada
Hemlo (Williams, David Bell) Mine

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 Location:
247 km E from Thunder Bay, Ontario, Canada
  Address:
P.O. Bag 500
Marathon
Ontario, Canada
P0T 2E0
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Alimak
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill
Production Start...
Mine Life2029
Hemlo transitioned to a fully underground operation during 2020.

Owners

Source: p. 148
CompanyInterestOwnership
Barrick Gold Corp. 100 % Indirect
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° ........

Mining Methods

  • Alimak
  • Transverse stoping
  • Longitudinal stoping
  • Cemented 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 ........

Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required171196235
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required2,914 kt3,062 kt3,351 kt3,408 kt
Total tonnes mined  ......  Subscription required  ......  Subscription required5,883 kt6,934 kt6,650 kt7,940 kt
Waste  ......  Subscription required  ......  Subscription required2,644 kt3,630 kt3,102 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required1.39 1.81 1.39
Daily processing capacity  ......  Subscription required  ......  Subscription required10 kt
Daily processing rate  ......  Subscription required  ......  Subscription required9,300 t
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Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven 0.36 Mt Gold 4.79 g/t 0.055 M oz
Probable 6.1 Mt Gold 5.19 g/t 1 M oz
Proven & Probable 6.4 Mt Gold 5.16 g/t 1.1 M oz
Measured 0.68 Mt Gold 4.5 g/t 0.099 M oz
Indicated 38 Mt Gold 2.03 g/t 2.5 M oz
Inferred 9.1 Mt Gold 2.8 g/t 0.82 M oz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs Gold USD 1,050 / oz   846 / oz   683 / oz  
Cash costs Gold USD 1,046 / oz†   841 / oz†   679 / oz†  
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,322 / oz   1,097 / oz   843 / oz  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,318 / oz†   1,092 / oz†   839 / oz†  
All-in costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,324 / oz   1,124 / oz   843 / oz  
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,320 / oz†   1,119 / oz†   839 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units2021202020192018201720162015
UG mining costs ($/t mined) USD 129.66100.858370.465.46870
OP mining costs ($/t mined) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 42   49   37  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 42   44   37  
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Heavy Mobile Equipment as of April 25, 2017:
HME TypeModelSizeQuantity
ANFO Loader ....................... Subscription required ....................... Subscription required
Backhoe ....................... Subscription required ....................... Subscription required
Cable bolter ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required 6.75 inch ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 9 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 7 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 7 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 2 cu. yd ....................... Subscription required
Scissor Lift ....................... Subscription required
Scissor Lift ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (underground) ....................... Subscription required 30 t ....................... Subscription required
Truck (underground) ....................... Subscription required 40 t ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
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Staff:

Total WorkforceYear
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Other 2018
Quarterly Report 2018
Operations & Technical Update 2017
Other 2017
Other 2017
Quarterly Report 2017
Technical Report 2017
Annual Report 2016
Management Discussion & Analysis 2016
Annual Report 2015
Other 2015
Annual Report 2014
Project Description 2014
Other 1998
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