Mineral Resources

Mineral Resources

Measured and Indicated Resources
Project
Category
Tonnes
Au Grade
(g/t) 
Ag Grade
(g/t)
Contained
Au oz 
Contained
Ag oz 
Cameron (1) Measured 3,360,000 2.75 - 297,000 -
Duparquet (2) Measured 183,600 1.43 - 8,500 -
Springpole (3) Indicated 151,000,000 0.94 5.00 4,600,000 24,300,000
Hope Brook (49%) (4) Indicated 2,695,000 4.77 - 413,560 -
Cameron (1) Indicated 2,170,000 2.40 - 167,000 -
Duparquet (2) Indicated 69,022,700 1.55 - 3,432,100 -
Duquesne (5) Indicated 1,859,200 3.33 - 199,161 -
Total Measured & Indicated 230,290,500 1.23 5.00 9,117,321 24,300,000
 
Inferred Resources
Project
Category
Tonnes
Au Grade
(g/t) 
Ag Grade
(g/t)
Contained
Au oz 
Contained
Ag oz 
Springpole (3) Inferred 16,000,000 0.54 2.80 300,000 1,400,000
Hope Brook (49%) (4) Inferred 409,640 4.11 - 53,900 -
Cameron (1) Inferred 6,535,000 2.54 - 533,000 -
Pickle Crow (30%) (6) Inferred 2,835,600 4.10 - 369,150 -
Duparquet (2) Inferred 37,371,900 1.36 - 1,636,000 -
Duquesne (5) Inferred 1,563,100 5.58 - 280,643 -
Pitt (7) Inferred 1,076,000 7.42 - 257,000 -
Total Inferred 65,791,240 1.61 2.80 3,429,693 1,400,000

* General Notes for Above Resources:

a) The rounding of tonnes may result in apparent differences between tonnes, grade and contained ounces.

b) Mineral resources that are not mineral reserves do not have demonstrated economic viability. The estimate of mineral resources may be materially affected by environmental permitting, legal, title, taxation, sociopolitical, marketing or other relevant issues.

(1) Notes for Cameron:

  • Based on the technical report titled “Technical Report on the Cameron Gold Deposit, Ontario, Canada”, dated effective January 17, 2017, which was prepared for First Mining by Optiro Pty Limited in accordance with NI 43-101, and which is available under First Mining's SEDAR profile at www.sedar.com.
  • 2014 CIM Definition Standards were followed for classification of mineral resources.
  • The mineral resource estimate is classified as Measured, Indicated and Inferred mineral resources.
  • The mineral resource has been estimated using a gold price of US$1,350 per ounce.
  • The mineral resource was estimated using a block model. Three dimensional wireframes were generated using geological information. The ordinary kriging estimation method was used to interpolate grades into blocks. Blocks were sub-blocked to more accurately reflect the volume of the wireframes.
  • Mineral resources that are not mineral reserves do not have demonstrated economic viability. There is currently insufficient exploration to define these Inferred mineral resources as Indicated or Measured mineral resources and it is uncertain if further exploration will result in upgrading them to an Indicated or Measured mineral resource category.
  • Numbers may not add due to rounding.
  • The mineral resource for the Cameron Gold Project does not include the mineralized material from the Dubenski and Dogpaw areas.

(2) Notes for Duparquet:

  • The independent and qualified persons for the mineral resource estimate, as defined by NI 43 101, are Marina Iund, P.Geo. and Carl Pelletier, P.Geo., both from Innovexplo. The effective date of the estimate is September 12, 2022.
  • These mineral resources are not mineral reserves, as they do not have demonstrated economic viability. There is currently insufficient data to define these Inferred mineral resources as Indicated or Measured mineral resources and it is uncertain if further exploration will result in upgrading them to an Indicated or Measured mineral resource category. The mineral resource estimate follows current CIM Definition Standards.
  • The results are presented in situ and undiluted and have reasonable prospects of economic viability.
  • In-pit and Underground estimates encompass sixty (60) mineralized domains and one dilution envelop using the grade of the adjacent material when assayed or a value of zero when not assayed; The tailings estimate encompass four (4) zones.
  • In-pit and Underground: High-grade capping of 25 g/t Au; Tailings: High-grade capping of 13.0 g/t Au for Zone 1, 3.5 g/t Au for Zone 2, 1.7 g/t Au for Zone 3 and 2.2 g/t Au for Zone 4. High-grade capping supported by statistical analysis was done on raw assay data before compositing.
  • In-pit and Underground: The estimate used a sub-block model in GEOVIA SURPAC 2021 with a unit block size of 5m x 5m x 5m and a minimum block size of 1.25m x 1.25m x1.25m. Grade interpolation was obtained by ID2 using hard boundaries. Tailings: The estimate used a block model in GEOVIA GEMS with a block size of 5m x 5m x 1m. Grade interpolation was obtained by ID2 using hard boundaries.
  • In-pit and Underground: A density value of 2.73 g/cm3 was used for the mineralized domains and the envelope. A density value of 2.00 g/cm3 was used for the overburden. A density value of 1.00 g/cm3 was used for the excavation solids (drifts and stopes) assumed to be filled with water. Tailings: A fixed density of 1.45 g/cm3 was used in zones and waste.
  • In-pit and Underground: The mineral resource estimate is classified as Measured, Indicated and Inferred. The measured category is defined by blocks having a volume of at least 25% within an envelope built at a distance of 10 m around existing channel samples. The Indicated category is defined by blocks meeting at least one (1) of the following conditions: Blocks falling within a 15-m buffer surrounding existing stopes and/or blocks for which the average distance to composites is less than 45 m. A clipping polygon was generated to constrain Indicated resources for each of the sixty (60) mineralized domains. Only the blocks for which reasonable geological and grade continuity have been demonstrated were selected. All remaining interpolated blocks were classified as Inferred resources. Blocks interpolated in the envelope were all classified as Inferred resources. Tailings: The Measured and Indicated categories were defined based on the drill hole spacing (Measured: Zones 1 and 2 = 30m x 30m grid; Indicated: Zone 3 = 100m x 100m grid and Zone 4 = 200m x 200m grid).
  • In-pit and Underground: The mineral resource estimate is locally pit-constrained with a bedrock slope angle of 50° and an overburden slope angle of 30°. The out-pit mineral resource met the reasonable prospect for eventual economic extraction by having constraining volumes applied to any blocks (potential underground extraction scenario) using DSO. It is reported at a rounded cut-off grade of 0.4 g/t Au (in-pit and tailings) and 1.5 g/t Au (UG). The cut-off grades were calculated using the following parameters: mining cost = CA$70.00 (UG); processing cost = CA$11.9 to 17.0; G&A = CA$8.75; refining and selling costs = CA$ 5.00; gold price = US$ 1,650/oz; USD:CAD exchange rate = 1.31; and mill recovery = 93.9%. The cut-off grades should be re-evaluated in light of future prevailing market conditions (metal prices, exchange rates, mining costs etc.).
  • The number of metric tons and ounces was rounded to the nearest hundred, following the recommendations in NI 43 101. Any discrepancies in the totals are due to rounding effects.
  • The authors are not aware of any known environmental, permitting, legal, title-related, taxation, socio-political, or marketing issues, or any other relevant issue not reported in the Technical Report, that could materially affect the Mineral Resource Estimate.

(3) Notes for Springpole:

  • Based on the technical report for the Springpole PFS entitled “NI 43-101 Technical Report and Pre-Feasibility Study on the Springpole Gold Project, Ontario Canada” which has an effective date of January 20, 2021 and is available under First Mining’s SEDAR profile at www.sedar.com.
  • 2014 CIM Definition Standards were followed for the classification of mineral resources. 
  • Mineral Resources potentially amenable to open pit mining are reported within an optimized constraining shell using the following parameters:
    • Metal prices of US$1,550/oz gold, US$20/oz silver, exchange rate of US$0.77:C$1
    • Mining cost of C$1.62/t, processing cost of C$15.38/t milled, G&A cost of C$1.00/t milled
    • Pit slopes varying between 35–50º depending on domain
    • Gold recovery of 88% and silver recovery of 93%
  • Mineral Resources are reported at a cut-off grade of 0.3 g/t Au.

(4) Notes for Hope Brook:

  • Based on the technical report titled “2015 Mineral Resource Estimate Technical Report, Hope Brook Gold Project, Newfoundland and Labrador, Canada", effective date January 12, 2015, which was prepared for First Mining by Mercator Geological Services Limited in accordance with NI 43-101, and which is available under First Mining's SEDAR profile at www.sedar.com.
  • 2014 CIM Definition Standards were followed for the classification of mineral resources.
  • Cut-off grade = 3.0 g/t Au.
  • Long-term gold price of US$1,200 per ounce.
  • This resource includes on the Mine Zone and 240 Zone areas.
  • This resource is based on the partial percentage block model with dike material removed. Dike percentage is estimated at 18% for the Mine Zone and 0% for the 240 Zone.
  • The gold grades reflect applications of domain-specific raw assay capping factors that range between 55 g/t and 3 g/t.

(5) Notes for Duquesne:

  • Based on the technical report titled “43-101 Technical Report Resource Estimate of The Duquesne Gold Property” dated July 26, 2011, which is available at www.sedar.com under the SEDAR profile for Clifton Star Resources Inc.
  • Cut-off grade = 1.0 g/t Au without taking into account the width and no dilution was applied when the horizontal width was 1 metre or less.

(6) Notes for Pickle Crow (30%)

  • First Mining owns 30% of the Pickle Crow Gold Project, and 70% is owned by Auteco Minerals Ltd.. The Inferred mineral resources for Pickle Crow shown in the above table reflects only the First Mining ownership interest.
  • Based on the technical report titled “An Updated Mineral Resource Estimate for the Pickle Crow Property, Patricia Mining Division, Northwestern Ontario, Canada” dated June 15, 2018, which was prepared for First Mining by Micon International Limited in accordance with NI 43-101, and which is available under First Mining's SEDAR profile at www.sedar.com.
  • 2014 CIM Definition Standards were followed for the classification of mineral resources.
  • Diluted to a minimum 1.0 metre width.
  • Entirely classified as an Inferred mineral resource.
  • The narrow-vein, selective underground component of the mineral resource has been estimated at a cut-off grade of 2.6g/t Au.
  • The long-hole bulk underground (moderate-grade) component of the mineral resource has been estimated at a cut-off grade of 2.0 g/t Au.
  • The open pit (low-grade) component of the mineral resource has been estimated at a pit discard cut-off grade of approximately 0.5 g/t Au, using a preliminary Whittle pit shell to constrain the resource estimate and other assumed pit parameters.
  • The mineral resource has been estimated using a gold price of US$1,300 per ounce.

(7) Notes for Pitt:

  • Based on the technical report titled “NI 43-101 Technical Report and Review of the Preliminary Resource Estimate for the Pitt Gold Project, Duparquet Township, Abitibi Region, Quebec, Canada” dated January 5, 2017, which was prepared for First Mining by Micon International Limited in accordance with NI 43-101, and which is available under First Mining's SEDAR profile at www.sedar.com.
  • Cut-off grade = 3 g/t Au, Minimum block width = 1.5 metres, Dilution grade = 0 g/t, Capping grade = 35 g/t Au.

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