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Resources & Reserves

CONSOLIDATED MINERAL RESERVE ESTIMATE (EFFECTIVE DECEMBER 31, 2020)

Proven and Probable December 31, 2020 December 31, 2019
Tonnes (000's) Grade (g/t) Gold Ozs (000’s) Depleted Oz Tonnes (000's) Grade (g/t) Gold Ozs (000’s)

Macassa

 3,532 20.1 2,282 187 3,320 22.1 2,360

Macassa Near Surface

 308 8.7 86 273 10.7 93

Total CDN Underground

 3,841 19.2 2,369 187 3,593 21.2 2,453

Detour Lake Pit - Above 0.5 g/t(1)

 382,969 0.96 11,862 617(1) 397,680 0.99 12,640

Detour Lake Pit - Below 0.5 g/t

 114,426 0.41 1,510

West Detour Pit - Above 0.5 g/t

 58,530 0.95 1,779 54,920 0.94 1,660

West Detour Pit - Below 0.5 g/t

 32,121 0.40 416

North Pit - Above 0.5 g/t

 5,877 0.95 180 5,950 0.98 187

North Pit - Below 0.5 g/t

 2,192 0.41 29

Detour Low Grade Fines

 0 0 18,900 0.59 360

Total CDN Open Pit**

 596,115 0.82 15,775 617 477,450 0.97 14,847

Total CDN Operations

 599,956 0.94 18,144 804 481,043 1.12 17,300

Fosterville

 3,610 15.4 1,790 647 3,000 21.8 2,100

Robbins Hill

 1,060 5.3 180 1,240 5.5 218

Total AUS Operations

 4,670 13.1 1,970 647 4,240 17.0 2,320

Total

 604,627 1.03 20,118 1,451 485,283 1.26 19,618

Holt Complex(2)

 31 5,432 4.0 702

Hislop(3)

 176 5.8 33

Northern Territory(4)

 5 988 4.0 128

Total NON OPERATING

 37 6,596 4.1 863

Total w/ NON OPERATING

 604,627 1.03 20,118 1,488 491,879 1.30 20,481

*Detour Lake’s depletion as of January 1, 2020.

**Kirkland Lake Gold acquired Detour Lake Mine on January 31, 2020. Please refer to detailed footnotes set out below.

CONSOLIDATED MEASURED & INDICATED MINERAL RESOURCES (EFFECTIVE DECEMBER 31, 2020)

Measured & Indicated December 31, 2020 December 31, 2019

Tonnes (000's)

Grade (g/t)

Gold Ozs (000’s)

Tonnes (000's)

Grade (g/t)

Gold Ozs (000’s)

Macassa

 1,800 13.3 769 1,616 13.8 717

Macassa Near Surface

 117 6.1 23 47 7.8 12

Holt Complex(2)

 11,690 4.5 1,699 7,752 4.2 1,047

Hislop(3)

 1,337 4.0 173 1,147 3.6 132

Detour Zone 58N

 2,900 5.8 534 2,900 5.8 534

Canamax

 240 5.1 39

Total Canada Underground

 17,844 5.6 3,198 13,702 5.6 2,481

Detour Lake

 107,748 1.15 3,991 81,400 1.15 3,003

West Detour

 23,462 0.88 667 31,000 0.88 878

Aquarius

 23,112 1.49 1,106 22,300 1.29 926

Total Canada Open Pit

 154,323 1.16 5,763 134,700 1.11 4,807

Total CDN Operations

 172,166 1.62 8,961 148,402 1.5 7,288

Fosterville

 7,690 5.6 1,390 12,300 5.3 2,080

Robbin’s Hill

 2,120 4.8 329 3,460 3.5 386

Northern Territory

 25,200 2.3 1,830 17,200 2.5 1,410

Total AUS Operations

 35,000 3.2 3,540 33,000 3.7 3,880

Total

 207,148 1.88 12,505 181,362 1.91 11,164

* M&I Mineral Reserves are reported exclusive of Mineral Reserves

** Kirkland Lake Gold acquired Detour Lake Mine on January 31, 2020. Please refer to detailed footnotes set out below.


CONSOLIDATED INFERRED MINERAL RESOURCES (EFFECTIVE DECEMBER 31, 2020)

Inferred December 31, 2020 December 31, 2019

Tonnes (000's)

Grade (g/t)

Gold Ozs (000’s)

Tonnes (000's)

Grade (g/t)

Gold Ozs (000’s)

Macassa

 1,349 17.0 737 1,039 16.7 557

Macassa Near Surface

 96 8.6 26 146 11.5 54

Holt Complex(2)

 9,097 4.5 1,310 9,097 4.4 1,294

Hislop(3)

 804 3.8 97 797 3.7 95

Detour Zone 58N

 1,000 4.4 136 1,000 4.4 136

Canamax

 170 4.3 23

Total Canada Underground

 12,346 5.8 2,306 12,249 5.5 2,159

Detour Lake1

 31,830 0.82 844 33,600 0.79 855

West Detour

 20,476 0.95 626 9,300 0.95 282

Aquarius

 502 0.87 14 9,300 0.95 282

Total Canada Open Pit

 52,808 0.87 1,484 42,900 0.82 1,137

Total CDN Operations

 65,153 1.81 3,790 55,149 1.86 3,296

Fosterville

 6,140 6.5 1,280 8,450 6.4 1,740

Robbin’s Hill

 2,420 6.0 467 2,670 4.5 383

Northern Territory

 19,200 2.3 1,390 15,200 2.6 1,270

Total AUS Operations

 27,700 3.5 3,140 26,300 4.0 3,390

Total

 92,867 2.32 6,929 81,469 2.55 6,689
  1. The Detour Lake Mine was acquired by Kirkland Lake Gold effective January 31, 2020 pursuant to the acquisition of Detour Gold. An updated National Instrument 43-101 compliant technical report with respect to the Detour Lake Mine will be filed in Q1 2021. Depletion in 2020, as noted in the Consolidated Mineral Reserve table is as of January 1,2020.
  2. The Holloway Mine was placed on care and maintenance in March 2020. Operations at the remainder of the Holt Complex were suspended effective April 2, 2020, with the suspension being extended until further notice on July 16, 2020. The Holt Complex assets were on care and maintenance as at December 31, 2020.
  3. The Hislop mine is a former producer acquired as part of St Andrew Goldfields in January 2016. Hislop has not been operated since the acquisition.
  4. The Cosmo mine and Union Reefs mill (part of the Company’s Northern Territory assets) were placed on care and maintenance effective June 30, 2017. Test mining and processing activities commenced at these assets in October 2019. These activities were suspended in March 2020
  5. Canamax included as part of Holt Complex in 2020.

Footnotes Related to Mineral Reserve Calculations

  1. CIM definitions (2019) were followed in the estimation of Mineral Reserves.
  2. Mineral Reserves were estimated using a long-term gold price of US$1,300/oz (C$1,700/oz; A$1,765/oz).
  3. Cut-off grades for Canadian Assets were calculated for each stope, including the costs of: mining, milling, General and Administration, royalties and capital expenditures and other modifying factors (e.g. dilution, mining extraction, mill recovery).
  4. Cut-off grades for Australian Assets were calculated for each mining block, including the costs of: mining, milling, General and Administration, royalties and capital expenditures and other modifying factors (e.g. dilution, mining extraction, mill recovery).
  5. Cut-off grades for Detour Lake were calculated using an optimized variable cut-off grade over time, including the costs of: mining, milling, General and Administration, royalties and capital expenditures and other modifying factors (e.g. dilution, mining extraction, mill recovery).
  6. Dilution estimates vary by mining methods and ranges from 5% to 50%.
  7. Extraction estimates vary by mining methods and range from 50% to 100%.
  8. Mineral Reserves estimates for Canadian Operations (excluding Detour Lake) were prepared under the supervision of Natasha Vaz, P.Eng.
  9. Mineral Reserve estimates for Detour Lake were prepared under the supervision of Andre Leite, P.Eng , AUSIMM CP (MIN), MEng., Technical Services Manager.
  10. Mineral Reserves estimates for Australian Operations were prepared under the supervision of I.Hann, FAusIMM
  11. Totals may not add up due to rounding.

 

Footnotes Related to Mineral Resource Calculations

  1. Mineral Resources classified in accordance with CIM Definition Standards (2019).
  2. Mineral Resources for Detour Lake and West Detour project are based on a cut-off grade of 0.50 g/t Au.
  3. Mineral Resources for Zone 58N are based on a cut-off grade of 2.2 g/t with an assumed mining dilution of 12%.
  4. Mineral Resources for Macassa and Holt Complex were estimated at the following cut-off grades:

Macassa '04/Main Break: 8.6 g/t

Macassa Near Surface: 3.4 g/t

Macassa SMC: 5.1 g/t

Holt Mine: 2.8 g/t, with the exceptions noted below

Holt Near-Surface Zones: 2.5 g/t (Tousignant, Cascade, North Mattawasaga Pit)

Holloway Mine: 2.8 g/t, with the exception of the Deep Thunder (2.7g/t) and Canamax (2.5 g/t)

Taylor Mine: 2.6 g/t

Hislop Property: 2.2 g/t

Aquarius: 0 g/t cutoff grade.

  1. Fosterville Open Pit Resources were estimated using cut-off grades ranging between 0.8 g/t Au and 1.0 g/t Au.
  2. Fosterville Underground Resources were estimated using cut-off grades ranging between 2.3 g/t Au and 3.1 g/t Au.
  3. Northern Territory Open Pit Resources were estimated using a cut-off grade of 0.5 g/t Au.
  4. Northern Territory Underground Resources were estimated using a cut-off grades ranging between 1.5 g/t Au and 2.0 g/t Au.
  5. Mineral Resources were estimated using a gold price of US$1,500/oz and a CAD/USD exchange rate of 1.31 for Detour Lake and West Detour project.
  6. Mineral Resources were estimated using a gold price of US$1,300/oz and a CAD/USD exchange rate of 1.25 for Zone 58N deposit.
  1. Mineral Resources were estimated using a gold price of US$1,500/oz and a CAD/USD exchange rate of 1.28 for Macassa and Holt Complex.
  2. Mineral Resources were estimated using a gold price of US$1,425/oz and an AUD/USD exchange rate of 1.36 for the Australian assets, with the exception of Maud Creek, which was estimated using a gold price of US$1,200 and AUD/USD exchange rate of 1.30.
  3. Mineral Resources are Exclusive of Mineral Reserves.
  4. Mineral Resource estimates for the Fosterville Property were prepared under the supervision of Troy Fuller, MAIG.
  5. Mineral Resource estimates for the Northern Territory properties were prepared under the supervision of Mark Edwards, FAusIMM, MAIG.
  6. Mineral Resource estimates for the Canadian assets (excluding Detour Lake) were prepared under the supervision of Eric Kallio, P. Geo. (Senior Vice-President, Exploration)
  7. Mineral Resource estimates for Detour Lake were prepared under the supervision of Andre Leite, P.Eng , AUSIMM CP (MIN), MEng., Technical Services Manager.
  8. Tonnes and gold ounce information is rounded to the nearest thousand; As a result, rows and columns may not add exactly due to rounding.