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Canada
Brookbank Project

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 Location:
63 km W from Geraldton, Ontario, Canada

  Project Contacts:
8000 Highway 11 P.O. Bag 10
Geraldton
Ontario, Canada
P0T 1M0
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WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Blast Hole Stoping
  • Backfill
Mine Life7 years (as of Jan 1, 2015)


Owners

Source: p. 78
CompanyInterestOwnership
Metalore Resources Ltd. 26 % Direct
Orion Mine Finance Group 29.6 % Indirect
Equinox Gold  Corp. 44.4 % Indirect
GGM owns 100% of the lease that covers the Brookbank deposit with the remaining portion of the project tenements being subject to two Joint Venture (“JV”) agreements with Metalore Resources Limited (“Metalore”). The first JV is a GGM 74% / Metalore 26% split with the second a GGM 79% / Metalore 21% split.

Greenstone Gold Mines is a 60/40 joint venture company between Equinox Gold and Orion Mine Finance Group.

Contractors

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Deposit Type

  • Hydrothermal
  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

The 6.5 kilometre long Brookbank shear zone hosts the Brookbank, Cherbourg, and Foxear deposits. The deposits occur along lithological contacts between mafic volcanics and metasediments. Other areas of gold mineralization are present in one or more of the localized deformation bands within the hanging wall mafic volcanics, which are generally parallel to the Brookbank main zone within the Brookbank shear zone structure.

The zones of mineralization at Brookbank, Cherbourg, and Foxear occur within one of several bands of intense deformation and hydrothermal alteration at or near the contact between domains of mafic flows and polymictic conglomerate. Hydrothermal alteration in the vicinity of the mineralization consists of silicification, carbonatization, sericitization, chloritization, hematization and sulphidization. This alteration is commonly marginal to quartz-carbonate veins, fractures, and stockworks and may exceed 50 metres in width locally.

Mineralogical studies indicate that the precious metal mineralization consists of goldsilver particles with an approximate gold to silver ratio of 80:20. The gold occurs primarily as late fracture-controlled mineralization. The mineralization forms elongate lenticular particles associated with grain boundaries and possibly crystallographic planes. The gold generally consists of fine grained free gold particles, although there is very little visible gold even in areas of plus 30 g/t Au assays. Gold values are h ........


Mining Methods

  • Truck & Shovel / Loader
  • Blast Hole Stoping
  • Backfill


Summary:

Based on the orientation, size, and suggested competence of the rockmass, open pit and underground longitudinal blasthole stoping have been selected as the most suitable mining methods. As Brookbank is located in Northern Ontario, personnel with mining experience are assumed to be available. The mining method requires mobile equipment that is commonly used in the industry.

Open Pit Mining
Pit designs have been developed for the West Pit and the East Pit.

In the absence of a formal wall slope geotechnical evaluation, some general assumptions have been made for good quality rock. It has been assumed that 10 metre benches can be doubled up between berms and that perimeter blasting techniques, including pre-splitting, will be used to increase bench face angles.

The wall slope design parameters used for pit optimization shown that the inter-ramp wall slope could be approximately 55 degrees and the overall wall slope with one ramp crossing is approximately 46.5 degrees.

For purposes of optimization rock was assigned a slope of 50 degrees. An overburden model was not available for slope coding. Final design slopes were based upon bench face angle and berm width.

The West Pit design was generated using a 20 metre wide haulage road for two way traffic. The pit is 420 metres long in the east west direction and 85 metres wide in the north south direction and reaches a depth of 50 metres.

A smaller East Pit desig ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsLOM
Gold oz 370,758

Operational Metrics:

Metrics
Daily milling rate 900 t *
Daily ore mining rate 900 t *
Ore tonnes mined, LOM 2,161,596 t *
Annual ore mining rate 328,500 t *
* According to 2015 study.

Reserves at September 3, 2020:
Open Pit Mineral Resources are reported at a cut-off grade of 0.60 g Au/t.
Underground Mineral Resources are reported at a cut-off grade of 2.4 g Au/t.

CategoryOreTypeTonnage CommodityGradeContained Metal
Indicated In-Situ (OP) 1.147 Mt Gold 2.24 g/t 83 koz
Indicated In-Situ (UG) 2.281 Mt Gold 7.06 g/t 517 koz
Inferred In-Situ (OP) 0.045 Mt Gold 2.07 g/t 3 koz
Inferred In-Situ (UG) 0.706 Mt Gold 3.38 g/t 77 koz

Commodity Production Costs:

CommodityUnitsAverage
Assumed price Gold USD 1,250 / oz *  
* According to 2015 study / presentation.

2015 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Total CapEx $M CAD  ......  Subscription required
OP OpEx $M CAD  ......  Subscription required
UG OpEx $M CAD  ......  Subscription required
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
Pre-tax IRR, %  ......  Subscription required
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Proposed Heavy Mobile Equipment as of March 20, 2015:
HME TypeSizeQuantity
Drill (long hole) ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Preliminary Economic Assessment 2015
Year-end Mineral Reserves 2015
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Subscription required - Subscription is required.

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