HECLA MINING CO/DE/

Consolidated Results of Continuing Operations

Total sales for the three months ended March 31, 2026 and 2025 were as follows:

Environmental remediation services revenue is generated by performing remediation work in the historical Yukon Territory mining district on behalf of the Canadian government. The scope and estimated cost of all work is agreed to in advance by the Canadian government, and the expenses incurred are passed through to the government for reimbursement with minimal margin generated by us in performing this work.

Total metal sales for the three months ended March 31, 2026 and 2025, and the approximate variances attributed to differences in metals prices, sales volumes and smelter terms, were as follows:

The fluctuation in sales for the three months ended March 31, 2026 compared to the same periods in 2025 was primarily due to the following:

•

Higher average realized prices for all metals for compared to the same period in 2025. The table below summarizes average spot prices and our average realized prices for the commodities we sell:

Average realized prices typically differ from average market prices primarily because concentrate sales are generally recorded as revenues at the time of shipment at forward prices for the estimated month of settlement, which differ from average market prices. Due to the time elapsed between shipment of concentrates and final settlement with the customers, we must estimate the prices at which sales of our metals will be settled. Previously recorded sales are adjusted to estimated settlement metals prices each period through final settlement. We recorded net positive price adjustments to provisional settlements of $0.8 million and $6.9 million for the three months ended March 31, 2026 and 2025, respectively. The price adjustments related to silver, gold, zinc, lead and copper contained in our concentrate shipments were partially offset by gains and losses on forward contracts and collars for those metals. See Note 9 of Notes to Condensed Consolidated Financial Statements (Unaudited)for more information. The gains and losses on these contracts are included in revenues and impact the realized prices for silver, gold, lead, and zinc. Realized prices are calculated by dividing gross revenues for each metal (which include the price adjustments and gains and losses on the forward contracts and collars discussed above) by the payable quantities of each metal included in concentrate, doré and carbon material shipped during the period.

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Higher quantities of all metals sold from continuing operations, except lead and copper, during the three months ended March 31, 2026 compared to the comparable 2025 period. See The Greens Creek Segment, The Lucky Friday Segment, and The Keno Hill Segment sections below for more information on metal production and sales volumes at each of our operating segments. Total metals production and sales volumes for each period are shown in the following table:

The difference between what we report as “ounces/tons produced” and “payable ounces/tons sold” is attributable to the difference between the quantities of metals contained in the concentrates we produce versus the portion of those metals actually paid for by our customers according to the terms of our sales contracts. Differences can also arise from inventory changes incidental to shipping schedules, or variances in ore grades which impact the amount of metals contained in concentrates produced and sold.

Sales, total cost of sales, gross profit (loss), Cash Cost, After By-product Credits, per Ounce (“Cash Cost”) (non-GAAP) and AISC (non-GAAP) at our operating segments for the three months ended March 31, 2026 and 2025 were as follows (in thousands, except for Cash Cost and AISC):

(1)

A reconciliation of these non-GAAP measures to total cost of sales, the most comparable GAAP measure, can be found below in Reconciliation of Total Cost of Sales (GAAP) to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Cost, Before By-product Credits and All-In Sustaining Cost, After By-product Credits (non-GAAP).

(2)

The calculation of AISC for our consolidated silver properties includes corporate costs for general and administrative expense and sustaining capital.

(3)

For the three months ended March 31, 2026, Other includes sales of $4.7 million and total cost of sales of $4.9 million from our environmental remediation services in the Yukon. For the three months ended March 31, 2025, Other includes sales and total cost of sales of $7.1 million.

While revenue from zinc, lead, copper and gold by-products is significant, we believe that identification of silver as the primary product of Greens Creek, Lucky Friday and Keno Hill is appropriate because:

•

silver has historically accounted for a higher proportion of revenue than any other metal and is expected to do so in the future;

•

we have historically presented Greens Creek and Lucky Friday as primary silver producers, based on the original analysis that justified putting the project into production, and the same analysis applies to Keno Hill. Further we believe that consistency in disclosure is important to our investors regardless of the relationships of metals prices and production from year to year;

•

metallurgical treatment maximizes silver recovery;

•

the Greens Creek, Lucky Friday and Keno Hill deposits are massive sulfide deposits containing an unusually high proportion of silver; and

•

in most of their working areas, Greens Creek, Lucky Friday and Keno Hill utilize selective mining methods in which silver is the metal targeted for highest recovery.

Accordingly, we believe the identification of gold, lead, zinc and copper as by-product credits at Greens Creek, Lucky Friday and Keno Hill is appropriate because of their lower economic value compared to silver and due to the fact that silver is the primary product we intend to produce at those locations. In addition, we have not consistently received sufficient revenue from any single by-product metal to warrant classification of such as a co-product.

We periodically review our revenues to ensure that reporting of primary products and by-products is appropriate. Because for Greens Creek, Lucky Friday and Keno Hill we consider zinc, lead, gold and copper to be by-products of our silver production, the values of these metals offset operating costs within our calculations of Cash Cost, After By-product Credits, per Silver Ounce and AISC, After By-product Credits, per Silver Ounce. We currently do not report Cash Cost, After By-product Credits, per Silver Ounce and AISC, After By-product Credits, per Silver Ounce for our Keno Hill operation as it has not met our definition of commercial production. We define an operation as being in commercial production upon achievement of the following criteria:

•

Completion of operational commissioning of each major mine and mill component;

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Demonstrated ability to mine and mill consistently and without significant interruption, defined as 75% of historical production levels or mill design capacity over a period of 90 days;

•

Silver recoveries are at or near expected steady-state production levels;

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All major capital expenditures have been completed; and

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A significant portion of available funding is directed towards operating activities.

Currently we meet only one of the above criteria - silver recoveries are at expected steady-state production levels. Determination of when these criteria have been met requires the use of judgment, and our definition of commercial production may differ from that of other mining companies.

As Keno Hill has not yet been determined to be in commercial production, its costs and by-product credits are excluded from our consolidated Cash Cost, After By-product Credits, per Silver Ounce and AISC, After By-product Credits, per Silver Ounce because (i) by definition it has not reached the sustaining stage and (ii) including its costs and by-product credits we believe would distort consolidated Cash Cost, After By-product Credits, per Silver Ounce and AISC, After By-product Credits, per Silver Ounce of our operating silver mines that are in commercial production and operating as designed, and would not facilitate a meaningful comparison of our performance versus that of our peers who do not report such metrics for mines that are not in commercial production.

For the three months ended March 31, 2026, we reported net income from continuing operations of $164.7 million (2025: $24.3 million) and a net loss applicable to common stockholders of $19.2 million (2025 - $28.7 million). Net loss applicable to common stockholders is lower than net income from continuing operations, due to the recognition of a loss from discontinued operations of $183.7 million, primarily due to the loss of $192.5 million on the sale of Hecla Quebec. The following were the significant drivers of the increase in net income from continuing operations:

•

Consolidated gross profit increased by $184.6 million. See The Greens Creek Segment, The Lucky Friday Segment, and The Keno Hill Segment sections below for a discussion on the key drivers by operation.

•

Interest expense decreased by $5.7 million primarily due to lower total debt levels compared to the same period of 2025.

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Other income increased by $2.6 million primarily due to higher interest earned as a result of a higher cash position.

The positive movements mentioned above were partly offset by:

•

Fair value adjustments, net decreased by $9.3 million primarily due to $10.3 million of net losses on undesignated derivative contracts.

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General and administrative expenses increased by $3.8 million primarily due to higher incentive compensation payments driven by improved financial and operational performance and an increase in Corporate headcount.

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Other operating expense, net increased by $4.4 million primarily due to a loss on disposal of Minera Hecla of $2.4 million which we sold for cash proceeds of $5.2 million.

•

Income and mining tax expense increased by $35.3 million due to higher taxable income generated primarily by our US operations.

Greens Creek

(1)

A reconciliation of these non-GAAP measures to total cost of sales, the most comparable GAAP measure, can be found below in Reconciliation of Total Cost of Sales (GAAP) to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Cost, Before By-product Credits and All-In Sustaining Cost, After By-product Credits (non-GAAP).

The $120.1 million increase in gross profit for the three months ended March 31, 2026, compared to the same period in 2025 was primarily due to higher realized sales prices for silver and gold, in addition to higher sales volumes for all metals produced.

Capital investments in the current quarter were $4.6 million lower compared to the same period in 2025. Current quarter costs included $3.1 million for primary ore access development, $1.0 million for definition drilling and $1.0 million for mining equipment.

Production of all metals other than silver was negatively impacted during the three months ended March 31, 2026, compared to the same period in 2025, primarily due to lower milled tons, partly offset by higher silver grades.

The charts below illustrate the factors contributing to Cash Cost, After By-product Credits, per Silver Ounce for Greens Creek:

For the three months ended March 31, 2026, the decrease in Cash Cost, After By-product Credits, per Silver Ounce and AISC, After By-product Credits, per Silver Ounce compared to the same period in 2025 was primarily due to an increase in gold by-product credits, reflecting higher realized gold prices, in addition to higher silver production, partly offset by higher production costs.

Lucky Friday

(1)

A reconciliation of these non-GAAP measures to total cost of sales, the most comparable GAAP measure, can be found below in Reconciliation of Total Cost of Sales (GAAP) to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Cost, Before By-product Credits and All-In Sustaining Cost, After By-product Credits (non-GAAP).

Gross profit increased by $41.4 million for the three months ended March 31, 2026 compared to the comparable period in 2025, reflecting higher realized prices for silver, zinc and lead, partly offset by lower sales volumes for all metals driven by lower production reflecting lower processed grade material, except for zinc.

Capital investments increased by $1.6 million for the three months ended March 31, 2026, compared to the same period in 2025. Significant capital expenditures during the three months ended March 31, 2026, included capital development of $7.4 million, $1.2 million for a shaft rehabilitation, $1.1 million for the surface cooling project, $0.8 million for definition drilling and $0.7 million for an underground truck replacement, $0.6 million on ramp work and $0.4 million on tailings facility pond 5 construction.

The charts below illustrate the factors contributing to Cash Cost, After By-product Credits, Per Silver Ounce for Lucky Friday:

For the three months ended March 31, 2026, Cash Cost, After By-product Credits, per Silver Ounce and AISC, After By-product Credits, per Silver Ounce are higher than the same period in 2025 primarily due to lower silver production and higher profit sharing and incentive compensation costs, partly offset by higher by-product credits.

Keno Hill

We have not disclosed cost per ounce statistics for the Keno Hill operation as it has not met our definition of commercial production. See above"Consolidated Results of Operations" for our definition of commercial production. Determination of when those criteria have been met requires the use of judgment, and our definition of commercial production may differ from that of other mining companies.

We acquired our Keno Hill operation as part of the Alexco Resource Corp. acquisition in September 2022 and have focused on development activities and began ramp-up of the mill during the second quarter of 2023. The average mill throughput during the three months ended March 31, 2026, was 276 tons per day (the mine is currently permitted to a maximum of an average of 440 tons per day), with silver grades milled of 20.8 ounces per ton. During the first three months of 2026, the mill has relied on existing ore stockpiles as the mine continues to focus on development and ramp up to higher tonnage rates with mining rates of 276 tons per day during the quarter, with material sourced from both the Bermingham and Flame and Moth deposits. Mill throughput, while currently steady, was negatively impacted in the first quarter by limited ore availability from the Bermingham deposit due to reduced output from the Bear zone and dilution control issues in narrow vein stopes caused by mining remnant areas as we depart that zone and transition into the Arctic zone, as well as by mine sequencing at the Flame and Moth deposit, which was altered as a result of power curtailments by Yukon Energy (the electric utility that supplies the Mine) lasting sixteen days in December 2025 and five days in January 2026 due to extreme cold weather. We expect these impacts to diminish throughout the remainder of the year.

During the three months ended March 31, 2026 and 2025, Keno Hill recorded sales of $46.4 million and $16.9 million, respectively, with the increase due to higher realized prices, partly offset by lower metals sales volumes. As a result of higher revenues, Keno Hill generated gross profit of $24.3 million during the three months ended March 31, 2026 (2025 - $1.0 million). During the quarter, Keno Hill recorded capital investments of $15.0 million, primarily related to $7.0 million of mine development, $1.9 million for underground haul trucks, and $0.8 million for surface equipment.

Prior Period Disruptions and Ongoing Impacts

From commencement of production until late August 2024, ore production and mill throughput generally increased as planned, resulting in higher production levels, although still below the mill’s permitted capacity. Beginning in mid‑2024 and continuing into 2025, however, Keno Hill was impacted by external events that affected permitting, projects and production, and delayed our ability to achieve sustained, profitable operations.

In late June 2024, an unrelated third party, Victoria Gold, experienced a heap leach failure at its Eagle Mine located near Keno Hill. Due to the resulting focus of the Yukon Government (“YG”) and the First Nation of Na‑Cho Nyäk Dun (“FNNND”) on the incident response rather than routine permitting matters, we were required to suspend milling operations at Keno Hill between August 27 and October 26, 2024 while awaiting authorizations and permits.

Beginning in late October 2024, Keno Hill experienced power curtailments after Yukon Energy suffered a turbine failure at its Aishihik hydroelectric plant in Whitehorse. This failure, combined with Yukon Energy’s focus on line maintenance and increased power demand due to cold winter temperatures, resulted in reduced power deliveries to Keno Hill and prevented us from fully powering the mine and mill on multiple occasions in late 2024 and the first quarter of 2025. These power constraints reduced silver production by approximately 130,000 ounces and resulted in approximately $0.5 million of labor costs for idled employees through September 30, 2025. Power conditions improved following the first quarter of 2025 and we do not expect additional curtailments due to the Aishihik turbine, which was successfully repaired in the third quarter of 2025. However, as mentioned above, we experienced power curtailments in the fourth quarter of 2025 and the first quarter of 2026. See the Risk Factor in our 2025 Form 10-K,"We may be subject to a number of unanticipated risks related to inadequate infrastructure."

Current Operational Challenges

Keno Hill continues to face operational challenges that constrain throughput and limit our ability to ramp up production. These challenges include: ore availability and dilution control issues during the transition from the Bear to the Arctic Zone; Flame and Moth mine sequencing; workforce availability and retention in a remote location; execution of infrastructure projects; limited camp capacity; and incremental demands on site infrastructure and resources associated with the ramp‑up of our subsidiary’s environmental remediation services activities at the Keno Hill site.

In addition, deliveries of certain equipment, including haul trucks, a bolter, a scissor deck, and a generator, were delayed during the first quarter. These delays affected capital development activities and, in the future, if delays occur and are not resolved on a timely basis, they could adversely impact mining flexibility and future ore availability.

Permitting and Infrastructure Constraints

Permitting remains one of the most significant factors affecting our ability to achieve sustained, profitable production at Keno Hill. Increasing production requires additional capacity across several operational areas, including tailings storage, waste rock disposal, water treatment and discharge limits, camp accommodation, and reliable power supply. Expanding these capacities requires obtaining new permits or amending existing ones, as well as capital investments to develop the associated infrastructure.

Although progress continues on these permitting matters, the pace of advancement has been affected by delays resulting from the Eagle Mine incident and heightened regulatory focus on the Yukon mining sector.

Tailings Storage

The currently permitted dry‑stack tailings storage area at Keno Hill (Phase 2E) is expected to reach capacity in approximately October 2026. The Phase 2W dry‑stack expansion requires final design approval from the Yukon Government ("YG"). We currently expect such approval by mid‑2026, which would allow Phase 2W to become operational before Phase 2E reaches capacity. If these approvals are not received on a timely basis, milling operations could be curtailed or interrupted. Further in the future, at current mining rates, we project that we would run out of tailings storage space in late 2028. The construction season in the Yukon is approximately April through October, and if permits are received by the first half of 2029, it is possible that tailings expansion could be advanced far enough in 2029 to permit the mill to resume normal production levels, and begin ramping up to higher production levels by the end of 2029. If that were to occur and an alternative plan not developed, milling operations could be curtailed or interrupted.

Quartz Mining License and Water License Amendments

Keno Hill's mill is currently permitted to process up to 440 tons per day (and it has achieved that rate for multiple weeks during test run periods); however, several factors other than mill capacity limit actual throughput, including dry stack tailings capacity and restrictions on waste rock production and disposal. To sustain operations at or near this permitted capacity, we will need to amend our quartz mining license (“QML”) and water license (“WL”) to remove these constraints. The process for securing these amendments includes submission of a Project Proposal to the Yukon Environmental and Socio‑economic Assessment Board (“YESAB”), which we intend to submit by year‑end 2026.

The YG is required to consult with the FNNND on permitting matters, including the YESAB review process. FNNND previously entered into a Cooperation and Benefits Agreement for Keno Hill, and we believe it remains supportive of the project. However, there can be no assurance that such support will continue or that the timing or outcome of the YESAB review will not be affected by FNNND’s position. In addition, FNNND has indicated interest in revisiting the existing Cooperation and Benefits Agreement

("CBA"), including unresolved wealth‑sharing provisions. We do not currently believe that negotiating changes to the CBA would impede the YESAB review process, but it is possible it could.

The YESAB review process is expected to take approximately 12 months, after which applications for amendments to the QML and WL would be submitted to the applicable regulators. We currently estimate that this overall process could be completed by approximately mid‑2029, although each sequential step in this process is subject to its own timing variability, and delays at any stage would affect the overall timeline. There can be no assurance, however, that any of these approvals or amendments will be obtained on this timeline or at all. Construction would commence after receiving the permits.

Waste Rock and Water Management Constraints

Our QML places limits on the cumulative amount of waste rock that may be produced during mining and on waste rock storage capacity and classification. At current mining rates, we project that the waste rock production limit could be reached by approximately mid‑2027, at which point waste rock production would need to be curtailed absent receipt of a QML amendment. If we do not alter mining rates by a sufficient amount or receive changes to our QML (which we are seeking, independent of the QML amendment process described above), it is possible mine production would stop by approximately mid‑2027 until the amended permits are received and related construction completed. Our QML also limits capacity in our waste rock disposal areas, which could become an operational challenge if we are successful in modifying the waste rock production limit.

As we develop new mining zones at Keno Hill, we have periodically encountered higher‑than‑expected groundwater inflows. While we currently remain within permitted water discharge limits, development of new zones could require an amendment to our WL. There can be no assurance that the YG would grant such an amendment. If we are unable to amend our WL on a timely basis and continued development would result in discharges exceeding permitted limits, we may be required to curtail production or adjust mine sequencing to remain in compliance.

See the Risk Factor in our 2025 Form 10‑K, “We are required to obtain governmental permits and other approvals in order to conduct mining operations.”

Strategic Focus and Path to 440 Tons Per Day

As stated above, Keno Hill has generated profits at current throughput rates and metal prices. Our near‑term strategic focus is to advance permitting and execute key infrastructure projects to place the mine on a path toward achieving its currently permitted capacity of 440 tons per day. At that rate and at current prices, we expect Keno Hill would generate sustained positive free cash flow while preserving optionality for potential expansion beyond 440 tons per day. The mill is currently permitted to process up to 440 tons per day, but there are factors other than mill capacity that limit throughput (e.g. dry stack tailings capacity and restrictions on waste rock production and disposal). As discussed above, to sustain operations at or near this permitted capacity, we will need to amend our QML and WL to remove these constraints. Sustained production at this level would require ore from both the Bermingham deposit and the lower‑grade Flame & Moth deposit, and, as discussed above, completion of infrastructure projects, receipt of required permit amendments, continued mine development, and maintenance of social license to operate.

If the prerequisites to continue mining through the mid-2027 to mid-2029 (or later) period – including receipt of QML and WL amendments are not met on a timely basis, our operations and financial results could be materially adversely affected. Even if amended permits are received on a timely basis, there will be a period of time required to construct the associated infrastructure. Given that the overall permitting process involves multiple sequential regulatory steps, each subject to its own timing variability, and risks inherent to construction in Yukon once permits are received, mining rates and continuous operation at Keno Hill between approximately 2027 and 2030 remains uncertain. It is likely that there will be times of curtailed production, if not outright halts to production during that period.

We continue to study the aforementioned issues to develop a plan to optimize Keno Hill for the periods described herein. Such a plan could result in accelerated production schedules and an earlier transition to care and maintenance. Alternatively, such a plan could result in slower mining rates so that curtailment periods are minimized, or possibly eliminated, until permits are received and sustained, profitable production at higher throughput rates is achievable.

If any one of the prerequisites described above is not achieved on a timely basis, or if metal prices decrease materially from current levels, Keno Hill could be placed on care and maintenance. See the Risk Factor in our 2025 Form 10‑K, “We may not realize all of the anticipated benefits from our acquisitions, including our 2022 acquisition of Alexco.”

Corporate Matters

Income Taxes

During the three months ended March 31, 2026, an income and mining tax provision of $50.9 million, resulted in an effective tax rate of 23.6%. This compares to an income and mining tax provision of $15.6 million, which resulted in an effective tax rate of 35.8% for the three months ended March 31, 2025. The comparability of our income and mining tax provision and effective tax rate for the reported periods was impacted by multiple factors, primarily: (i) mining taxes; (ii) variations in our income before income taxes; (iii) geographic distribution of that income; (iv) foreign exchange rates including non-recognition of foreign exchange gains and losses; (v) percentage depletion; and (vi) the non-recognition of tax assets. The effective tax rate will fluctuate, sometimes significantly, period to period. The change in the effective tax rate during the three months ended March 31, 2026, compared to the comparable period in 2025 is primarily related to the reported consolidated income as well as the losses incurred at our consolidated Alexco subsidiaries (that own the Keno Hill mine assets), and our Nevada subsidiaries, for which no tax benefit is recognized due to uncertainty surrounding our ability to utilize these future tax benefits.

Each reporting period we assess our deferred tax balances based on a review of long-range forecasts and quarterly activity. A valuation allowance is provided for deferred tax assets for which it is more likely than not the related tax benefits will not be realized. We analyze our deferred tax assets and, if it is determined that we will not realize all or a portion of our deferred tax assets, we record or increase a valuation allowance. Conversely, if it is determined we will ultimately more likely than not be able to realize all or a portion of the related benefits for which a valuation allowance has been provided, all or a portion of the related valuation allowance will be reduced. There are a number of factors that impact our ability to realize our deferred tax assets. Valuation allowances are provided on deferred tax assets in Nevada, Mexico, and certain Canadian jurisdictions. For additional information, please see risk factors Our accounting and other estimates may be imprecise and Our ability to recognize the benefits of deferred tax assets related to net operating loss carryforwards and other items is dependent on future cash flows generating taxable incomein Item 1A - Risk Factors in our 2025 Form 10-K.

Reconciliation of Total Cost of Sales to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Cost, Before By-product Credits and All-In Sustaining Cost, After By-product Credits (non-GAAP)

The tables below present reconciliations between the most comparable GAAP measure of total cost of sales to the non-GAAP measures of (i) Cash Cost, Before By-product Credits, (ii) Cash Cost, After By-product Credits, (iii) AISC, Before By-product Credits and (iv) AISC, After By-product Credits for our operations and for the Company for the three months ended March 31, 2026 and 2025.

Cash Cost, After By-product Credits, per Ounce and AISC, After By-product Credits, per Ounce are measures developed by precious metals companies (including the Silver Institute and the World Gold Council) in an effort to provide a uniform standard for comparison purposes. There can be no assurance, however, that these non-GAAP measures as we report them are the same as those reported by other mining companies.

Cash Cost, After By-product Credits, per Ounce is an important operating statistic that we utilize to measure each mine's operating performance. We use AISC, After By-product Credits, per Ounce as a measure of our mines' net cash flow after costs for reclamation and sustaining capital. This is similar to the Cash Cost, After By-product Credits, per Ounce non-GAAP measure we report, but also includes reclamation and sustaining capital costs. Current GAAP measures used in the mining industry, such as cost of goods sold, do not capture all the expenditures incurred to discover, develop and sustain silver and gold production. Cash Cost, After By-product Credits, per Ounce and AISC, After By-product Credits, per Ounce also allow us to benchmark the performance of each of our mines versus those of our competitors. As a silver and gold mining company, we also use these statistics on an aggregate basis - aggregating the Greens Creek and Lucky Friday mines to compare our performance with that of other silver mining companies. Similarly, these statistics are useful in identifying acquisition and investment opportunities as they provide a common tool for measuring the financial performance of other mines with varying geologic, metallurgical and operating characteristics.

We have not disclosed cost per ounce statistics for the Keno Hill operation as it has not met our definition of commercial production. See above "Consolidated Results of Operations" for our definition of commercial production. Determination of when those criteria have been met requires the use of judgment, and our definition of commercial production may differ from that of other mining companies.

Cash Cost, Before By-product Credits and AISC, Before By-product Credits include all direct and indirect operating cash costs related directly to the physical activities of producing metals, including mining, processing and other plant costs, third-party refining expense, on-site general and administrative costs, royalties and mining production taxes. AISC, Before By-product Credits for each mine also includes reclamation and sustaining capital costs. AISC, Before By-product Credits for our consolidated silver properties also includes corporate costs for general and administrative expense and sustaining capital costs. By-product credits include revenues earned from all metals other than the primary metal produced at each unit. As depicted in the tables below, by-product credits comprise an essential element of our silver unit cost structure, distinguishing our silver operations due to the polymetallic nature of their orebodies.

In addition to the uses described above, Cash Cost, After By-product Credits, per Ounce and AISC, After By-product Credits, per Ounce provide management and investors an indication of operating cash flow, after consideration of the average price received from production. We also use these measurements for the comparative monitoring of performance of our mining operations period-to-period from a cash flow perspective. We currently do not report Cash Cost, After By-product Credits, per Silver Ounce and AISC, After By-product Credits, per Silver Ounce for our Keno Hill operation as it is in the ramp-up phase of production and accordingly it is excluded from our consolidated Cash Cost, After By-product Credits, per Silver Ounce and AISC, After By-product Credits, per Silver Ounce.

(1)

Includes all direct and indirect operating costs related to the physical activities of producing metals, including mining, processing and other plant costs, third-party refining and marketing expense, on-site general and administrative costs and royalties, before by-product revenues earned from all metals other than the primary metal produced at each operation. AISC, Before By-product Credits also includes reclamation and sustaining capital costs.

(2)

AISC, Before By-product Credits for our consolidated silver properties includes corporate costs for general and administrative expense and sustaining capital.

(3)

Other includes $4.9 million and $7.1 million of total cost of sales for the three months ended March 31, 2026, and 2025, respectively.

(4)

Keno Hill is in the ramp-up phase of production and is excluded from the calculation of Cash Cost, Before By-product Credits, Cash Cost, After By-product Credits, AISC, Before By-product Credits, and AISC, After By-product Credits.