Gold reser­ves and mineral resources 31.12.2023

Pampalo

The updated ore estimate for the Pampalo mine has a total ore reserve of 349,000 tonnes with a grade of 2.90 g/t gold for 32,200 ounces of gold. The updated ore reserve represents an 8.7 % increase in tonnes and 9.5 % increase in ounces when compared to the ore reserve estimate as of 31 December 2022. The updated ore reserve estimate includes the underground area and the open pit. The underground area of Pampalo has a proven ore reserve of 189,000 tonnes with a grade of 3.36 g/t gold for 20,000 ounces of gold and a probable ore reserve of 81,000 tonnes with a grade of 3.52 g/t gold for 9 200 ounces of gold. Most of the increase in ore reserves comes from the underground drilling program completed in 2023, where a total of 74 drill holes were drilled in the planned mining area between levels 875 and 955. This resulted in several high-grade intersections (release 4 September 2023 and 10 January 2024) which are included in the current updated estimate.

The Pampalo open pit was re-started in summer 2022. The mineral resource estimate was updated, and part of the resources were converted into ore reserves based on the open pit optimization results and pit planning. The updated estimate for the Pampalo open pit area has a probable ore reserve of 79 000 tonnes with a grade of 1.17 g/t gold for 3,000 ounces of gold.

In addition to the ore reserves at the Pampalo deep extension area, a measured mineral resource of 117,000 tonnes at a grade of 3.52 g/t including 13,200 ounces of gold, indicated mineral resource of 56,000 tonnes at a grade of 3.20 g/t including 5,800 ounces of gold, and inferred mineral resource of 152,000 tonnes at a grade of 3.81 g/t including 19,400 ounces of gold, has been reported. These are located below the reported ore reserves. The Pampalo deposit remains open at depth and the company is planning to continue underground drilling in 2024. An additional inferred mineral resource of 465,000 tonnes with a grade of 1.43 g/t gold for 21,400 ounces gold has been reported for the Pampalo open pit. The deposit mined in the Pampalo open pit remains open at depth and towards northeast and the company is planning to complete a surface drilling program in 2024 to test further potential of these areas.

The Korvilansuo and Kuittila deposits at the Southern gold line were the target of exploration drilling during 2023, and high-grade intercepts were reported from both, which are included in the updated mineral resource estimates. The updated mineral resource estimate for Korvilansuo has an inferred resource of 838,000 tonnes with a grade of 2.49 g/t gold for 67,200 ounces of gold. The updated resource represents an 307 % increase in gold ounces when compared to the previous estimate. The updated mineral resource estimate for Kuittila has an inferred resource of 814,700 tonnes with a grade of 1.88 g/t gold for 49,170 ounces of gold. The updated resource represents an 114 % increase in gold ounces when compared to the previous estimate.

The mineral resources of the suspended Rämepuro satellite mine were updated during 2023. The updated mineral resource estimate for Rämepuro has a measured resource of 23,000 tonnes with a grade of 2.66 g/t gold for 1,900 ounces of gold, indicated resource of 412,000 tonnes with a grade of 1.53 g/t gold for 20,200 ounces of gold and inferred resource of 381,000 tonnes with a grade of 1.35 g/t gold for 16,500 ounces of gold. The total resource represents a 290 % increase in gold ounces when compared to the previous estimate. The mineral resources have increased primarily due to expanding the resource model north, south and at depth from the existing open pit.

The estimates for the Pampalo mine and the resources along the Karelian Gold Line in Finland have been prepared according to the 2012 Australasian Code for Reporting of Mineral Resources and Ore Reserves (Joint Ore Reserve Committee – JORC-code).

Gold resources in Idaho, USA

There have been no changes in the reported mineral resources of the deposits in the Idaho project. At the beginning of 2022 Endomines carried out an underground drilling campaign. The campaign produced very encouraging drill results (press release May 31, 2022) as out of 8 holes, 5 drill holes intersected high-grade (over 8g/t) gold mineralization. More drilling is needed to better define the continuities and dimensions of the high-grade zones. The company intends to continue development in the US in line with its strategy through a partnership model.

The mineral resources reported for the Friday Underground and Buffalo Gulch projects in Idaho, USA, are classified in accordance with standards defined by Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”), “CIM Definition Standards – For Mineral Resources and Mineral Reserves”, prepared by the CIM Standing Committee on Reserve Definitions and adopted by CIM Council on May 10, 2014.

The mineral resources currently quoted regarding the Deadwood, Rescue, and Kimberly exploration projects, are per definition historical, made before the introduction of today’s disclosure standards. Endomines cautions that while the presented historic resources for Kimberly, Rescue, and Deadwood appear to be in general accordance with those set out in NI 43-101 Sections 1.2 and 1.3, a qualified person has not done sufficient work to classify the historical estimates as current mineral resources, and Endomines is not treating the historical estimates as current or reliable.

Gold and silver resources in Montana, USA

The US Grant is a high-grade, underground gold and silver project with a historical resource totaling 165,700 ounces of gold and 4.47M ounces of silver contained in 346 000 tonnes of mineralized material. The US Grant mine has had gold and silver mined periodically between 1867 and 1984. The Kearsarge project is a high-grade, underground gold project with a historical resource totaling 380 700 ounces of gold contained in 4.1 million tonnes of mineralized material.

The addition of the US Grant and Kearsarge gold projects adds a historical total of 546,400 ounces of gold and 4.47 million ounces of silver with considerable potential for additional resources to be discovered through exploration of the district.

Endomines is not treating the US Grant and Kearsarge historic estimates as either a mineral resource or mineral reserve as defined in NI 43-101.

Ore reserves at Karelian Gold Line 31/12/2023

The mineral resources are additional to the Ore reserves.

Mineral Resources – Karelian Gold Line, Finland 31/12/2023

Ore reserves and mineral resources estimated according the 2012 JORC-code edition, all figures independently rounded.

(1) The underground ore reserve estimate is based on stope and development designs; cut-off grade 1.5 g/t Au; waste rock dilution 10-30%; ore loss in stoping 5%, drifting not modelled separately

(2) The open pit ore reserve estimate based on pit optimization studies and stope designs; cut-off grade 0.5 g/t; wasterock dilution 15%

(3) Underground mineral resources; cut-off 1,5 g/t; top cut 10-20 g/t gold; preliminary stope desings completed for Pampalo Deep resource

(4) Open pit mineral resources (above -115m mine level): Cut-off 0,5 g/t; top cut 7 g/t gold. Underground mineral resources (below -115m mine level): Cut-off 1,5 g/t; top cut 7 g/t gold.

(5) Mineral resources; cut-off 0,5 g/t; top cut 10 g/t gold

(6) Mineral resources; cut-off 0,5 g/t, top cut 10 g/t gold

(7) Open pit mineral resources reported inside optimized pit shell based on assumed gold price of US$1,850/oz and mining, processing and G&A costs from the Pampalo operations and transportation ore to the Pampalo mill, metallurgical recovery for gold is 85%; cut-off 0,5 g/t; top cut 14 g/t gold. Underground mineral resources reported at cut-off of 1,4 g/t gold.

(8) Open pit mineral resources are reported at a cut-off grade of 0.65 g/t Au and constrained by an optimised pit shell. Underground mineral resources are reported at a cut-off grade of 0.95 g/t Au. Assumed gold price of US$1,886/oz, Metallurgical recovery for gold 85 %, opex costs were used from Pampalo process plant and from similar sized open pit and underground operations. High gold assays were capped at 19 g/t Au. The mineral resource estimate has an effective date of January 9th, 2024.

(9) Mineral resources; cut off 0,5 g/t; top cut 11g/t (low grade domain) or 50 g/t gold (high grade domain)

(10) Mineral resources; cut-off 0,5 g/t, top cut 40 g/t gold. The estimate has an effective date of December 11, 2023. Mineral resource validated by Endomines.

(11) Mineral resources; cut-off 0,5 g/t top cut 20 g/t gold

Troy ounce = 31.103 g

Mineral Resources – Idaho/Montana, USA  31/12/ 2023

(1) Measured, Indicated and Inferred mineral classifications are assigned according to CIM Definition Standards. Mineral resources, which are not mineral reserves, do not have demonstrated economic viability and there is no guarantee that mineral resources will be converted to mineral reserves. Mineral resource tonnage and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding.

(2) The mineral resource estimate was prepared by HRC based on data and information available as of March 1, 2016. The Measured, Indicated and Inferred mineral resources are reported considering a base case estimate that applies a cutoff grade of 3.4 g/t Au based on the estimated operating costs, recoveries, and a $1,300/oz gold price.

(3) The mineral resource estimate was prepared by HRC based on data and information available as of December 10, 2017. The Measured, Indicated and Inferred mineral resources are reported considering a base case estimate that applies a cutoff grade of 0.14 g/t Au based on the estimated operating costs, recoveries, and a $1,300/oz gold price.

Silver Mineral Resources – Montana, USA 31/12/ 2023

(1) Endomines caution that while the historic resources presented appear to be in general accordance with those set out in NI 43-101 Sections 1.2 and 1.3, a qualified person has not done sufficient work to classify the historical estimate as current mineral resources, and Endomines is not treating the historical estimate as current nor reliable.