• Data Access
  • Your Email  
  • Your Email  
Keep me signed in.
Forgot your password?
Close
  • Forgot Your Password?
  • Enter the email you signed up with and we'll email it to you.
  • Your Email  
Close
Back
MDO
Mining Data Solutions
  • Home
  • Database
  • Subscribe
  • Sign In
  • Sign In
Canada
Island Gold Expansion Project (Island Gold Mine)

This page is not tailored to
devices with screen width under 750 px.
 Location:
10 km SE from Dubreuilville, Ontario, Canada

  Project Contacts:
Goudreau Road, PO Box 456
Dubreuilville
Ontario, Canada
P0S 1B0
Phone  ...  Subscription required
Fax705-884-1608
WebsiteWeb
Additional Resources for Suppliers & Investors
Drill results over 30 g/t Au
Stay on top of recent discoveries.
Search drill results by commodity and grade.
Largest mines in the Americas
Mining and mill throughput capaciites.
Full profiles of select mines and projects.
Deepest underground mines
Shaft depth and mill throughput data.
Full profiles of select mines and projects.
Heavy mobile equipment
HME type, model, size and quantity.
Full profiles of select mines and projects.
Permitting and construction projects
Projects at the permitting or construction stage. Full profiles of select projects.
Mines with remote camps
Camp size, mine location and contacts.
Full profiles of select mines and projects.
Mines & projects in Canada
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Filings & News

Thank you for browsing through mine profiles compiled by the Mining Data Online team.

Would you like to subcribe or schedule a Demo?
  • Name:
     
  • Company:
     
  • Position:
     
  • Phone:
  • Email:
  • Message:

Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole stoping
  • Alimak
  • Longitudinal retreat
  • Cemented backfill
Processing
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life8 years (as of Jan 1, 2017)
Received permit approval for the Phase II expansion of Island Gold to 1,200 tpd in May 2019. The Company is currently conducting a Phase III expansion study at Island Gold beyond 1,200 tpd, which is expected to be completed during the second quarter of 2020.
Latest NewsAlamos Gold Files Technical Report for the Island Gold Mine     August 31, 2020


Owners

Source: p. 1
CompanyInterestOwnership
Richmont Mines Inc. 100 % Direct
Alamos Gold Inc. 100 % Indirect
November 23, 2017 - Alamos Gold Inc. announces completion of acquisition of Richmont Mines Inc.

Deposit Type

  • Vein / narrow vein
  • Orogenic


Summary:

The Island Gold Mine is an Archean orogenic gold deposit. It is a structurally hosted quartz-carbonate vein system situated within the Goudreau Lake Deformation Zone (“GLDZ”), a major regional brittle-ductile structure. The host terrane is a sequence of felsic to intermediate volcanic rocks of the Wawa Assemblage which are in the greenschist metamorphic range as is common for this class of deposit.

Gold mineralization in the Goudreau-Lochalsh area is not restricted to any rock type with the general exception of the later intruded north-west trending Matachewan diabase dykes which show no evidence of mineralization. Deposits may be hosted by one or several rock types, with past-producing mines and numerous other gold occurrences in the area exhibiting a close spatial association with felsic, intermediate and even mafic intrusive rocks.

Alteration within the Island Gold deposit is characterized by the presence of intense silicification, sericitization, carbonatitzation and pyritization. Pyrite content is typically 2% to 10% in disseminated form and less commonly as millimeter scale discontinuous stringers. Accessory alteration minerals may include tourmaline, apatite, epidote, chloritoid and local garnet in the deeper levels. The alteration occurs primarily in linear south dipping envelopes which can pinch, swell and anastomize in thickness between decimeter scale to over 8 m in thickness. There appears to be a gradual change in alteration with depth as silicification becomes more dominant. The alteration envelopes are termed Alteration Package Island (“API”) in mine geology nomenclature.

Within the wider envelopes of strongly deformed, sheared, altered rock previously described narrower zones of mineralized lenses
containing quartz carbonate veins contain economic gold. Quartz veins commonly bear visible gold (“VG”) and generally speaking, the majority of the gold content of the mineralized intersects will be contained in the quartz veins, with lower grade material in the surrounding altered more pyritic footwall and hangwall host rocks. Within the veins, VG forms clouds of fine gold droplets up to 3 mm in diameter but metallurgical studies indicate that generally free gold flake are less than 25 microns in diameter. Generally, the degree of veining appears to become more robust at depth, transitioning from a more stringer style quartz-carbonate vein on scales between millimeter and decimeter to larger scale veins over 4 metres in width, such as vein development seen on the 800 metre level and elsewhere at depth.


Mining Methods

  • Longhole stoping
  • Alimak
  • Longitudinal retreat
  • Cemented backfill


Summary:

Of all the methods tested since mining activities commenced at the Island Gold Mine, the longitudinal long hole retreat mining method is the most productive and least costly, and is more commonly known as the Modified Avoca Mining Method. The ore width, vertical dip, good ground quality, productivity factors, costs, availability of equipment and personnel were some of the major parameters involved in the decision.

Before any stope mining can be carried out, a 4.5 m wide and 4.5 m high ramp is developed from level to level by jumbo drilling. Ore development is completed on levels approximately 22 m to 25 m apart vertically, sill to sill and is carried out by jumbo drilling. The ore drives are 4m wide by 4m high. All ore development headings are controlled by the geology department with width drift dimensions maintained at 4 m in width by 4 m in height.

LONG-HOLE STOPING METHOD:
Long hole mining consists in drilling a series of sub-vertical holes in the ore from one level to the other. The ore is then blasted in vertical slices. The ore is retrieved from the bottom drift using remote scoop trams. For every horizontal sublevel (approximately 22 to 24 m apart sill to sill), a primary slot (V30) is excavated at the extremity of the stope and blasting of a first stope, 18 m in length, is achieved following a longitudinal retreating fashion. All the broken ore is extracted before another blast is taken to ensure maximum ore recovery should any unplanned caving occur. Once the stope is empty, waste rock is used to refill the opened excavation as non-cemented rock fill. To create space for blasting of the second stope on the same sublevel, a void is pulled as a primary opening. The second stope is then blasted, mucked and backfilled. The process is repeated until the entire sublevel is mined out.

For the future sill pillars below the 740 metre level, the use of cemented rock fill may replace waste rock. The purpose is to allow for greater long-term stability and to allow for a higher ore pillar recovery. Cemented rock fill has not been used to date, but the necessary equipment has been purchased.

ALIMAK STOPING METHOD:
The alimak stoping method consists of using an alimak climber as a means of development and production drilling instead of conventional horizontal development.

The process starts by driving a raise along the height of the stope that will serve for secondary support and production drilling access. The raise dimension will typically be 3 m x 3 m.

Once the raise is completely driven, either by breaking through on the upper level or not breaking through if no overcut is planned, the raise screening is installed.

The next step consists of drilling and installing secondary support. For Island Gold, the support will consist of cement grouted cable bolts.

Production drilling is conducted on a horizontal axis on both side of the raise. The blasting sequence consists of taking horizontal slices followed by void mucking only. Once the entire stope is blasted, continuous mucking can begin. Maintaining the stope filled with blasted material allows for better dilution control.

Once mucking is completed, backfilling with run-of-mine waste completes the production cycle. To keep backfill from running in adjacent stopes, pillars are planned between each stope.

This mining method has not been used to date at Island Gold but is part of the current Life Of Mine (“LOM”) plan for one area of the mine.


Crushing and Grinding


Processing

  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Island Gold Mine ore is processed at the Kremzar Mill. The mill is composed of a two stage crushing section followed by a two-stage grinding section. The mill uses cyanide leaching and a carbon-in-pulp process to recover gold. Some improvements were made to the plant in recent years such as replacement of crushers, cyclone replacement, and piping and pumping upgrades.

The ore from the stockpile is crushed by a jaw crusher followed by a secondary cone crusher. The crushed material is then sent to a ball mill operated in closed circuit and with cyclones and a regrind mill. Gold is leached in a leaching circuit and extracted in a carbon in-pulp (“CIP”) circuit. The loaded carbon is washed with a nitric acid solution to remove scale before being sent through a carbon regeneration kiln. Gold is removed from the loaded carbon by elution (stripping) followed by electrowinning. The stripped carbon is regenerated in reactivation kilns before being returned to the process. Fine ca ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 9.66
Subscription required - Subscription is required.

Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 115926
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Daily milling rate  ......  Subscription required
Stripping / waste ratio  ......  Subscription required
Daily mining rate  ......  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 2017 study.

Reserves at May 29, 2017:

CategoryTonnage CommodityGradeContained Metal
Measured 475,700 t Gold 11.11 g/t 169,900 oz
Indicated 2,089,900 t Gold 10.55 g/t 708,800 oz
Measured & Indicated 2,565,600 t Gold 10.65 g/t 878,700 oz
Inferred 496,300 t Gold 14.95 g/t 238,500 oz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD 479 / oz *
All-in sustaining costs (AISC) Gold USD 616 / oz *
All-in costs Gold USD 671 / oz *
Assumed price Gold USD 1,150 / oz *
* According to 2017 study / presentation.

Operating Costs:

Units2017
UG mining costs ($/t milled) CAD 129 *
Processing costs ($/t milled) CAD  ......  Subscription required
Total operating costs ($/t milled) CAD  ......  Subscription required
* According to 2017 study.
Subscription required - Subscription is required.

2017 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M CAD  ......  Subscription required
Sustaining CapEx $M CAD  ......  Subscription required
Total CapEx $M CAD  ......  Subscription required
UG OpEx $M CAD  ......  Subscription required
Processing OpEx $M CAD 87.3
G&A costs $M CAD 48.8
Total OpEx $M CAD  ......  Subscription required
Gross revenue (LOM) $M CAD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M CAD  ......  Subscription required
Pre-tax NPV @ 5% $M CAD  ......  Subscription required
After-tax NPV @ 5% $M CAD  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of May 29, 2017:
HME TypeModelSizeQuantity
Drill 2
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 8
....................... Subscription required ....................... Subscription required 12
Subscription required - Subscription is required.

Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
Corporate Presentation 2017
Preliminary Economic Assessment 2017
Press Release 2017
Subscription required - Subscription is required.

News:

NewsDate
Alamos Gold Files Technical Report for the Island Gold Mine August 31, 2020
Alamos Gold Announces Phase III Expansion of Island Gold to 2,000 tpd July 14, 2020
Alamos Gold Further Extends High-Grade Mineralization at Island Gold. Exploration Success from 2019 Program Expected to Drive Strong Growth in Mineral Resources January 15, 2020
Alamos Gold Continues to Expand High-Grade Mineralization Between Eastern and Main Extensions at Island Gold September 11, 2019

Aerial view:

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2020 MDO Data Online Inc.