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Notes to above Mineral Resources:

1. Certain definitions: The term “resource” means that it is a concentration or occurrence of material of economic interest in or on the Earth’s crust in such form, grade or quantity that there are reasonable prospects for economic extraction. Inferred, Indicated, and Measured resources are in order of increasing confidence based on level of underlying geological evidence. The term ‘inferred resource’ is that part of a mineral resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling. The term “limited geological evidence” means evidence that is only sufficient to establish that geological and grade or quality continuity is more likely than not. The level of geological uncertainty associated an inferred mineral resource is too high to apply relevant technical and economic factors likely to influence the prospects of economic extraction in a manner useful for evaluation of economic viability and must have a reasonable expectation that the majority of inferred mineral resources could be upgraded to indicated or measured mineral resources with continued exploration. In addition, no assurances can be given that any mineral resource estimate will ultimately be reclassified as proven or probable mineral reserves or that inferred resources will be upgraded to measured or indicated resources.
2. Mineral Resource estimates are reported exclusive of mineral reserves, are current as of December 31, 2024, and are reported using definitions in Item 1300 of Regulation S and were prepared by the Company’s technical staff.
3. Assumed metal prices for 2024 estimated Mineral Resources were $27.00 per ounce of silver, $2,100 per ounce of gold, $1.30 per pound of zinc, $1.00 per pound of lead, unless otherwise noted.
4. Palmarejo Mineral Resource estimates use the following key input parameters: assumption of conventional longhole underground mining; reported above a variable gold equivalent cut-off grade that ranges from 1.83–2.10 g/t AuEq; metallurgical recovery assumption of 92.0% for gold and 83.0% for silver; variable mining costs that range from US$57.67–US$74.45/tonne, surface haulage costs of US$4.29/tonne, process costs of US$31.06/tonne, general and administrative costs of US$15.95/tonne, and surface/auxiliary support costs of US$4.42/tonne. Excludes the impact of the Franco-Nevada gold stream agreement at Palmarejo in calculation of Mineral Resources.
5. Kensington Mineral Resource estimates use the following key input parameters: Mineral Resource estimates use the following key input parameters: metal price of $2,300 per ounce gold, assumption of conventional longhole underground mining; reported above a variable gold cut-off grade of 0.115 oz/ton Au; metallurgical recovery assumption of 94.2%; gold payability of 97.5%, mining costs of US$116.09/ton mined; process costs of US$55.14/ton processed; general and administrative costs of US$53.18/ton processed; sustaining capital US$4.50/ton processed; and concentrate refining and shipping costs of US$97.48/oz sold.
6. Wharf Mineral Resource estimates use the following key input parameters: assumption of conventional open pit mining; reported above a gold cut-off grade of 0.008 oz/ton Au; average metallurgical recovery assumption of 78.0% across all rock types; royalty burden of US$140.40/oz Au; pit slope angles that vary from 34–50º; mining costs of $2.56/ton mined, and process costs of US$12.02/ton processed (includes general & administrative and sustaining capital costs).
7. Rochester Mineral Resource estimates are tabulated within a confining pit shell and use the following input parameters: Rochester oxide variable recovery Au = 77.7–85.9% and Ag = 59.4%; Rochester sulfide variable recovery Au = 15.2–77.7% and Ag = 0.0–59.4%; with a net smelter return cutoff of $3.76/ton oxide and US$3.86/ton sulfide; Nevada Packard oxide recovery Au = 92.0% and Ag = 61.0%; with a net smelter return cutoff of $4.24/ton for oxide; Lincoln Hill oxide recovery Au = 63.9% and Ag = 39.5%; with a net smelter return cutoff of $4.53/ton for oxide, where the NSR is calculated as resource net smelter return (NSR) = silver grade (oz/ton) * silver recovery (%) * (silver price ($/oz) - refining cost ($/oz)) + gold grade (oz/ton) * gold recovery (%) * (gold price ($/oz) - refining cost ($/oz)); variable pit slope angles that approximately average 48º over the life-of-mine.
8. Silvertip Underground Mineral Resource estimates are reported using a net smelter return (“NSR”) cutoff of US$130/tonne. Mineral Resources are reported insitu using the following assumptions: The estimates use the following key input parameters: lead recovery of 89-90%, zinc recovery of 82-83% and silver recovery of 83- 84%. Lead concentrate grade of 53-54%; zinc concentrate grade of 56-57%; mining costs of US$68.77/tonne; processing costs of US$58.20/tonne and US$46.49/tonne, where the NSR ($/tonne) = tonnes x grade x metal prices x metallurgical recoveries – royalties – TCRCs – transport costs over the life of the mine. 2023 metal prices were used to determine the mineral resource which were $25.00 per ounce of silver, $1.30 per pound of zinc, $1.00 per pound of lead.
9. Wilco Open Pit Mineral Resource estimates are reported using an equivalent gold cutoff of 0.20 ounces per ton assuming a silver to gold ratio of 60:1. Resources are reported in-situ and contained withed a conceptual measured, indicated and inferred optimized pit shell. Silver price of US$20/oz, gold price of US$1,400/oz. Average oxide and sulfide gold recovery is 70%, average carbonaceous gold recovery is 50%. Average oxide and sulfide gold recovery is 60%. Average carbonaceous silver recovery is 50%. Open pit mining cost is US$1.50/ton, processing and processing and general and administrative cost is US$5.46/ton; average pit slope angles of 50º. The technical and economic parameters are those that were used in the 2018 Resource Estimation. Based on the QPs review of the estimate, there would be no material change to the mineral resources if a gold price of US$1,700/oz, a silver price of US$22/oz or economic parameters were updated. Therefore the 2018 Mineral Resource report is considered current and is presented unchanged.
10. Las Chispas Mineral Resource estimates uses the following key input parameters: assumption of conventional underground mining; reported above a silver cut-off grade of 205 g / tonne silver equivalent and an incremental development cut-off grade of 54 g / tonne AgEq; metallurgical recovery assumption of 97.5% for silver and 98.0% for gold; mining loss of 2% for development and 5% for stoping was applied, additional losses have been included to account for the required pillars in uphole stopes that cannot be filled; variable production mining costs that range from US$58.06–US$239.51/t, development mining costs of US$27.40/t, process costs of US$45.72/t, site general and administrative costs of US$20.70/t, underground general and administrative costs of US$12.81/t, and sustaining capital costs of US$7.64/t.
11. Rounding of short tons, grades, and troy ounces, as required by reporting guidelines, may result in apparent differences between tons, grades, and contained metal contents.