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Liberia
Dugbe Project

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 Location:
60 km E from Greenville, Liberia

  Project Contacts:
366 Bay Street, Suite 200
Toronto
Ontario, Canada
M5H 4B2
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
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Overview

StageFeasibility
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life14 years (as of Jan 1, 2022)


Owners

Source: p. 3
CompanyInterestOwnership
Pasofino Gold Ltd. 49 % Indirect
Hummingbird Resources plc 51 % Indirect
Hummingbird Resources Liberia Ltd. (operator) 100 % Direct
The Pasofino interest in the Dugbe Gold Project is subject to an earn-in agreement between its wholly-owned subsidiary ARX and Hummingbird Resources Plc under which ARX can earn a 49% economic interest (prior to giving effect to the Government of Liberia's 10% free carried interest) in exchange for meeting certain requirements specified in the agreement. When the 10% carried interest is issued by Hummingbird Liberia to the Government of Liberia, the interest earned or held by ARX will be a 44.1% economic interest (consisting of a 39% shareholding interest in Hummingbird Liberia and economic rights in 5.1% of the equity securities of Hummingbird Liberia held by Hummingbird PLC). In addition, Hummingbird PLC will transfer to ARX 49% of the inter-company loans owing by Hummingbird Liberia to Hummingbird PLC.

Contractors

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Deposit Type

  • Metamorphic
  • Orogenic


Summary:

Boadi (1991) determined that the pyroxene-garnet gneisses are of volcanic and volcano-sedimentary origin and that the protoliths would therefore be consistent with typical Birimian lithologies; however, this protolith assessment does not categorically exclude Archaean protoliths.

The Tuzon and Dugbe F deposits can be broadly classified as being highly metamorphosed “orogenic type” deposits. Whilst orogenic gold deposits typically exhibit strong structural controls on mineralisation and are generally hosted within veins or shear zones or zones, these are not obvious at Tuzon and Dugbe F. Orogenic deposits elsewhere within the Birimian of West Africa belong to the mesozonal class and typically have structural controls of the brittle-ductile type. It is apparent that Tuzon and Dugbe F were subject to lower crustal hypozonal conditions with higher temperature and pressure within the ductile zone.

The upper amphibolite to granulite facies gneissic host rocks and the absence of wall-rock alteration at Dugbe F and Tuzon is atypical of Birimian deposits. Alteration may have been ‘obliterated’ by the high temperature metamorphism that post-dated the gold mineralisation. High-strain fabrics, possible ‘relic’ sheared intervals and micro-shearing at a crystal-scale, may be indicative of a major shearing event which is less obvious being ductile (without brittle aspects) which affected the bulk of the rock-mass of the host and immediate country rocks. It may be that ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining of both the Tuzon and Dugbe F deposits will be executed through conventional open-pit methods of drill and blast followed by load and haul operations. Loading and hauling will be carried out through the use of 90t dump trucks and 200t excavators. Drilling and blasting will be performed on 12m benches for waste and 6m benches for ore, some of which will be loaded in 3m flitches.

The planned Dugbe F pits cover an area of approximately 2.5km by 1km and the planned Tuzon pit approximately 1.5km by 0.80km. Each pit will have a single adjacent large waste rock dump (WRD), eventually containing 280Mt of waste rock over an area of 270ha. Waste rock will be placed adjacent to the pits, or in areas of mined-out pits in the case of Dugbe F. WRDs will be progressively capped every year, and fully closed as sections are completed. Ore will be delivered to the crusher or to low-grade stockpiles to prioritise highergrade ore being fed to the process plant. The available small proportion of oxide ore will be blended into the hard rock ore before being processed.

Mining of the Dugbe F deposit will consist of three pits, namely north, central and main pit, with the main pit consisting of four pushbacks. Tuzon will consist of one main pit with four pushbacks over the life of the mine (LOM). Mining at Dugbe F will start a year after mining begins at Tuzon, with both deposits mined concurrently to keep the strip ratio low. The first five years will see an a ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 1722,274
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

Reserves at June 13, 2022:
Mineral Reserves are reported at 0.50g/t cut-off grade and a metal price of USD 1,600/oz Au.

The Mineral Resource for Tuzon assumes open pit mining at a marginal cut-off grade of 0.34 g/t Au for fresh material and 0.39g/t Au for weathered material, within a USD 1,700/oz gold conceptual pit shell.
The Mineral Resource for Dugbe F assumes open pit mining at a marginal cut-off grade of 0.36g/t Au for fresh material and 0.40 g/t Au for weathered material, within a USD 1,700/oz gold conceptual pit shell.

CategoryTonnage CommodityGradeContained Metal
Proven 1 Mt Gold 1.34 g/t 45 koz
Probable 65 Mt Gold 1.29 g/t 2,716 koz
Proven & Probable 66 Mt Gold 1.3 g/t 2,760 koz
Measured 1.2 Mt Gold 1.44 g/t 56 koz
Indicated 80 Mt Gold 1.3 g/t 3,340 koz
Measured & Indicated 81.2 Mt Gold 1.3 g/t 3,396 koz
Inferred 16.9 Mt Gold 1.13 g/t 617 koz

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
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Operating Costs:

Units2022
OP mining costs ($/t milled) USD 11.5 *
Processing costs ($/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
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 710
G&A costs $M USD 957
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 4% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of June 13, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Dozer ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Feasibility Study Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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