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Canada
Island Gold Expansion Project (Island Gold)

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 Location:
10 km SE from Dubreuilville, Ontario, Canada

  Project Contacts:
15 Goudreau Road, PO Box 456
Dubreuilville
Ontario, Canada
P0S 1B0
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Longitudinal open stoping
  • Alimak
  • Transverse open stoping
  • Avoca
  • Cemented backfill
Production Start...
Mine Life18 years (as of Jan 1, 2022)
The 2020 Phase 3 Expansion Study (P3 2000) has been normalized to the P3+ Expansion.

The Phase 3+ Expansion to 2,400 tpd from the current rate of 1,200 tpd will involve various infrastructure investments. These include the installation of a shaft, paste plant, and an expansion of the mill. This infrastructure was all incorporated into the P3 2000 Study with several scope changes to accommodate the 20% increase in production rates to 2,400 tpd including a larger mill expansion and paste plant, as well as accelerated development to support the higher mining rates.
Latest NewsAlamos’ Island Gold mine keeps giving up its goods     December 2, 2022


Owners

Source: p. 16
CompanyInterestOwnership
Alamos Gold Inc. 100 % Indirect
Alamos holds 100% of all mining titles related to the Island Gold property, which comprises approximately 15,000 ha.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Orogenic
  • Vein / narrow vein


Summary:

The Island Gold Property is located in the Michipicoten Greenstone Belt (MGB) which is part of the Wawa Subprovince within the Archaean Superior Province. The MGB is approximately 140 km long and up to 45 km wide. The metamorphic grade of the subprovince is greenschist but amphibolite facies can be seen locally or proximal to intrusions. A major regional deformation zone called the Goudreau Lake Deformation Zone (GLDZ) is situated throughout the area. It is a north-easterly trending structure which has been traced along strike for 30 km with a width of 4.5 km and believed to be the main control of gold mineralization for the Project area. It is a high angle oblique-slip fault zone with an overall dextral movement cutting stratigraphy at a shallow angle. There are three main splays to the GLDZ in the area, the southernmost of which hosts the Island Gold Mine structure which contains a stacked sequence of east-northeast striking, steeply dipping, and subparallel zones of gold mineralization.

Lithologies appear to form a conformable homoclinal volcano-stratigraphic sequence, facing and younging to the north in the project area. Tight to isoclinal folds and local attenuation or boudinage of units along fold limbs appear to occur regionally. Fold axes are subparallel to the regional foliation at N070°E to N095°E.

The Island Gold Mine is stratigraphically positioned in the upper portion of the Wawa Assemblage, on the northern limb of the Goudreau Anticline. Th ........


Mining Methods

  • Longitudinal open stoping
  • Alimak
  • Transverse open stoping
  • Avoca
  • Cemented backfill


Summary:

Longitudinal long-hole open stoping will continue to be utilized as the primary mining method with both the addition of the shaft and paste plant key elements to supporting the increase in mining rates to 2,400 tpd. Relative to the P3 2000 Study, the paste plant has been sized with a 20% larger capacity.

Shaft
The main components of the shaft infrastructure are unchanged from the P3 2000 Study with the exception of the addition of a bin house and hoist drive cooling building. The bin house will allow for a more efficient and lower cost transfer of ore and waste to haul trucks on surface.

A 5.0 metre diameter concrete lined shaft will be constructed with a steel head frame. The shaft will house two 12 tonne skips in dedicated compartments for ore and waste movement, and a double-deck service cage for the transport of personnel and materials. The shaft will be sunk to an initial depth of 1,373 metres. The hoisting plant is designed for an ultimate depth of 2,000 metres providing flexibility to accommodate future exploration success. At the initial depth of 1,373 metres, the shaft has a capacity of 4,500 tpd, more than sufficient to accommodate the peak mining rates of 3,600 tpd (ore & waste).

A conventional blind sink methodology will be utilized providing improved schedule reliability with minimal impact on existing operations. The underground ore and waste handling and loading pocket will be a conventional configuration similar to that of ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 2874,460
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Daily milling capacity  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Mineral Reserves are estimated at cut-off grade of 3.06 g/t Au for developed areas and 3.74 g/t Au for undeveloped areas.
Mineral Resources are estimated at an undiluted cut-off grade of 3.74 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Proven 834,100 t Gold 9.33 g/t 250,150 oz
Probable 3,277,750 t Gold 10.33 g/t 1,088,300 oz
Proven & Probable 4,111,850 t Gold 10.12 g/t 1,338,450 oz
Measured 20,350 t Gold 4.92 g/t 3,200 oz
Indicated 1,075,950 t Gold 8.18 g/t 283,100 oz
Measured & Indicated 1,096,300 t Gold 8.12 g/t 286,300 oz
Inferred 7,905,600 t Gold 13.59 g/t 3,453,800 oz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs (sold) Gold USD  ......  Subscription required *†
All-in sustaining costs (sold) Gold USD  ......  Subscription required *†
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2022
UG mining costs ($/t milled) USD 79 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Expansion CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Subscription required - Subscription is required.


Heavy Mobile Equipment as of June 28, 2022:
HME TypeSizeQuantityStatus
Bolter ....................... Subscription required Proposed
Excavator ....................... Subscription required Existing
Grader ....................... Subscription required Existing
Jumbo ....................... Subscription required Existing
Loader ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Load-Haul-Dump (LHD) 6 cu. yd ....................... Subscription required Existing
Load-Haul-Dump (LHD) 3.5 cu. yd ....................... Subscription required Existing
Scissor Lift ....................... Subscription required Existing
Truck (boom) ....................... Subscription required Existing
Truck (fuel / lube) ....................... Subscription required Existing
Truck (underground) ....................... Subscription required Existing
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 12, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 12, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 12, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Corporate Presentation 2022
Other 2022
Pre-Feasibility Study Report 2022
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Corporate Presentation 2017
Preliminary Economic Assessment 2017
Press Release 2017
Subscription required - Subscription is required.

News:

NewsDate
Alamos’ Island Gold mine keeps giving up its goods December 2, 2022

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