HYCROFT MINING HOLDING CORP

The Company’s sole property is the Hycroft Mine, a gold and silver operation located 54 miles northwest of Winnemucca, spanning Humboldt and Pershing counties in Nevada. The mine is accessible via Nevada State Route 49 (Jungo Road), an all-weather, unpaved route maintained in part by both Humboldt County and the Company. A major east-west railway runs adjacent to the property.

The Hycroft Mine straddles Townships 34, 35, 35½, and 36 North, and Ranges 28, 29, and 30 East, Mount Diablo Base and Meridian (“MDB&M”), with coordinates approximately at 40°52’ north latitude and 118°41’ west longitude. It is situated on the western flank of the Kamma Mountains, near the eastern edge of the Black Rock Desert.

The property consists of 30 private parcels with patented claims totaling approximately 1,787 acres, along with 3,247 unpatented mining claims covering approximately 62,298 acres, for a combined total of approximately 64,000 acres. On May 15, 2023, the Company expanded its holdings by acquiring a 50% undivided interest in three additional mining claims, adding approximately 60 acres.

On-site facilities include two administration buildings, a mobile maintenance shop, a light vehicle maintenance shop, a warehouse, leach pads (North and Brimstone), primary, secondary, and tertiary crushing systems, two Merrill-Crowe process plants, and a refinery. Re-grading of the Crofoot heap leach pad slopes is underway in accordance with the BLM-approved reclamation plan, and it could be used as a waste facility in the future after appropriate modifications and permitting. The remaining infrastructure may support future development.

The Hycroft Mine operates under permits authorized by the BLM, NDEP, NDOW, Nevada Division of Water Resources (“NDWR”), and various county agencies.

Hycroft Technical Report Summary

The information that follows relating to the Hycroft Mine is derived, for the most part, from, and in some instances is an extract from, the 2023 Hycroft TRS. Portions of the following information are based on assumptions, qualifications and procedures that are not fully described herein. Reference should be made to the full text of the 2023 Hycroft TRS, incorporated herein by reference and made a part of this 2024 Form 10-K, as previously filed with the SEC on March 28, 2023.

Overview and Highlights

The 2023 Hycroft TRS provides an initial assessment of the mineral resources at the Hycroft Mine. It outlines plans to process sulfide and transition mineralization using a milling and pressure oxidation (“POX”) process, while oxide mineralization will be processed through heap leaching. Prepared by third-party consultants, including Ausenco, IMC, and WestLand, the report reflects updated findings and supersedes the 2022 Hycroft TRS, which should no longer be relied upon.

During 2023, the Company advanced metallurgical testing to improve gold and silver recoveries from sulfide-bearing ores. This work included studies on crushing, grinding, flotation variability, pressure oxidation, carbon-in-leach, dewatering, and tailings compaction. These efforts also explored potential byproducts to enhance revenue streams and optimize the deposit’s economic potential.

As of the date of the 2023 Hycroft TRS, the Hycroft Mine’s measured and indicated resources include 10.6 million ounces of gold and 360.7 million ounces of silver, with inferred resources of 3.4 million ounces of gold and 96.1 million ounces of silver. These resources span oxide, transitional, and sulfide ores.

The Company will continue to evaluate the opportunities identified in the 2023 Hycroft TRS, taking into account inflationary pressures on equipment and input costs. An updated technical report will be issued when appropriate, as the Company further refines its analysis and explores additional opportunities.

Hycroft Mine

For a detailed discussion of the Hycroft Mine’s operating and production data, see Part II– Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations– Hycroft Mine.

The Hycroft Mine and related facilities are located approximately 54 miles northwest of Winnemucca, Nevada. Winnemucca, a city with a population of approximately 8,431 (2020 Census data), is a commercial community on Interstate 80, 164 miles northeast of Reno. The mine property straddles Townships 34, 35, 35½, and 36 North and Ranges 28, 29, and 30 East MDB&M with an approximate latitude 40°52’ north and longitude 118°41’ west.

The following shows the location of our property.

Additionally, the following map shows the current property and facilities layout.

The town is served by a transcontinental railroad and a municipal airport. Access to the Hycroft Mine from Winnemucca is via Nevada State Route 49 (Jungo Road), a well-maintained, unpaved road, and a short access road leading to the mine’s main entrance. Within the property, well-maintained mine and exploration roads provide access throughout the property. Additional access routes are available from Imlay, Gerlach, and Lovelock, by unpaved roads intersecting Interstate 80 and Nevada State Route 447.

The majority of the Hycroft Mine’s workforce resides in the Winnemucca area. The site receives electrical power from NV Energy through the northwestern Nevada power grid. Initial surveys indicate that Winnemucca has the necessary infrastructure, including shopping, emergency services, and schools, to support the maximum workforce and dependents. The Hycroft Mine currently has water rights which are believed to be adequate to support potential future operations.

The Hycroft Mine is located on the eastern edge of the Black Rock Desert and the western flank of the Kamma Mountains, between Winnemucca and Gerlach, Nevada. The area lacks streams, rivers, or major lakes, with elevations ranging from 4,500 to 5,500 feet above sea level. The region’s climate is arid, with an average annual precipitation of 7.7 inches. Summer temperatures typically range from 50°F to 90°F, while winter temperatures average between 20°F and 40°F.

The mine consists of 30 private parcels with patented claims covering approximately 1,787 acres and 3,247 unpatented lode and placer claims spanning roughly 62,298 acres, totaling about 64,000 acres. Patented claims occupy private land, while unpatented claims are located on public lands managed by the BLM. These claims are subject to U.S. federal and Nevada state regulations.

To maintain the patented claims in good standing, annual property tax payments must be made to the county in which the claims are held. To maintain unpatented claims in good standing, a notice of intent to maintain the claims must be filed with the county, along with annual mineral claim filing fees to the BLM. Filing fees for these claims amounted to $0.6 million for the years ended December 31, 2024 and 2023. As long as we file the annual notice and pay the claim filing fees, there is no expiration date for our unpatented claims.

A portion of the Hycroft Mine is subject to an agreement that requires payment of a 4% net profit royalty on certain patented and unpatented mining claims. The royalty is subject to a maximum of $7.6 million, with $3.3 million satisfied and $4.3 million outstanding as of both December 31, 2024 and 2023. The net profit royalty has no expiration date.

Additionally, the Hycroft Mine is subject to the Sprott Royalty Agreement, which mandates a perpetual royalty payment equal to 1.5% of Net Smelter Returns, as defined in the Sprott Royalty Agreement. There is no expiration or limit on the total amount payable under the Sprott Royalty Agreement.

The Hycroft Mine was formerly known as the Crofoot-Lewis open pit mine, which was a small heap leaching operation that commenced in 1983. Vista Gold Corp., a corporation incorporated under the laws of the Yukon Territory (“Vista”), acquired the Crofoot-Lewis claims and mine in 1987 and 1988. During this first operating period, the mine produced over 1.0 million ounces of gold and 2.5 million ounces of silver. The mine production continued until it was placed on a care and maintenance program in December 1998 due to low gold prices. Hycroft Mining Corporation (“HMC”) acquired the Hycroft Mine in 2007 pursuant to an agreement which Vista transferred its Nevada mining properties to HMC’s predecessor. HMC restarted the Hycroft Mine in 2008 and suspended mining operations on July 8, 2015. During 2016, HMC was actively processing and producing gold from the ore within the heap leach pads. On January 1, 2017, HMC went into a care and maintenance mode when it stopped adding lime to the leach pads and continued to operate in a care and maintenance mode throughout 2017 and 2018. Prior to restarting operations, production of gold and silver was a byproduct of HMC’s maintenance activities on the Hycroft Mine. In December 2018 HMC began restart activities, including the rehabilitation of the crushing facility and construction of a new leach pad, with active mining operations beginning in the second quarter of 2019 with six haul trucks, two hydraulic shovels, and one wheel loader. Initial gold and silver production occurred in August 2019 and continued until active mining operations ceased at the Hycroft Mine in November 2021.

Existing facilities on site include two administration buildings, a mobile maintenance shop, a fixed maintenance shop, an assay lab, a light vehicle maintenance shop, a warehouse, leach pads, primary, secondary, and tertiary crushing systems, two Merrill-Crowe process plants, and a refinery. Components for a second refinery are present on-site and will be assembled during the mining activities expansion. In the event of any missing components for the refinery’s construction, they will be acquired and delivered to the site as part of the overall mining expansion. The crushing system will need to be refurbished and upgraded prior to restarting activities. All other facilities are operational except for the crushing system and the North Merrill-Crowe plant, which will be rehabilitated and brought online when required. The gross carrying value of property, plant, and equipment associated with the Hycroft Mine as of December 31, 2024 and 2023, was $87.9 million and $87.1 million, respectively.

Geology and Mineralization

The Hycroft Mine is located on the western flank of the Kamma Mountains. The deposit is hosted in a volcanic eruptive breccia and conglomerates associated with the Tertiary Kamma Mountain volcanics. The volcanics are mainly acidic to intermediate tuffs, flows, and coarse volcanoclastic rocks. Fragments of these units dominate the clasts in the eruptive breccia. The Central Fault and East Fault control the distribution of mineralization. A post-mineral range-front fault separates the ore body from the adjacent Pleistocene Lahontan Lake sediments in the Black Rock Desert. The geological events have created a physical setting ideally suited to the open-pit, heap leach mining operation at the Hycroft Mine. The heap leach method is widely used in the southwestern United States and allows the economical treatment of oxidized low-grade ore deposits in large volumes. The Company is contemplating sulfide processes commonly used worldwide to treat refractory sulfide ores.

The deposit is typically broken into six major zones based on geology, mineralization, and alteration: Brimstone, Vortex, Central, Bay, Boneyard, and Camel. Breaks between the zones are major faults.

Mineralization at the Hycroft Mine has been deposited through multiple phases. An early silica sulfide flooding event deposited relatively low-grade gold and silver mineralization generally along bedding. This mineralization is crosscut by later, steeply dipping quartz alunite veins. Late-stage silver bearing veins are found in the Vortex zone and at depth in the Central area. Late to present supergene oxidation along faults has liberated precious metals from sulfide mineralization and further enriched gold and silver mineralization, along water table levels.

The known gold mineralization extends for a distance of three miles in a north-south direction by 1.5 miles in an east-west direction. Mineralization extends to a depth of less than 330 feet in the outcropping to near-outcropping portion of the deposit on the northwest side to over 2,500 feet in the Vortex deposit in the east.

Drilling

The Hycroft Mine mineral resource model includes data from 1981 to 2022 and includes 5,601 holes, representing 2,588,826 feet of drilling, of which 171 holes were added during 2021 and 2022. In the 2023 Hycroft TRS, there are 5,532 drill holes in the resource model area which includes holes drilled to define stockpiles.

Drill hole collar locations are shown in the figure below.

Consistent with HMC’s suspension of mining operations and conducting only care and maintenance activities on the Hycroft Mine, during 2017 and through December 2018, only drilling to obtain ore for metallurgical testing purposes was conducted. In December 2018, HMC began confirmation drilling of certain sulfide ore stockpiles that we planned to mine.

Any expansion of the Hycroft Mine necessary to exploit any additional mineral resources that may be established through our exploration drilling program beyond the mineral resources in the 2023 Hycroft TRS, will require us to obtain all permits, approvals and consents of regulatory agencies responsible for the use and development of mines in Nevada.

Measured, Indicated and Inferred Mineral Resources

Our mineral resource estimates are calculated in accordance with the Modernization Rules. Measured, indicated and inferred mineral resources may not be comparable to similar information regarding mineral resources disclosed in accordance with the guidance of other countries. The estimates of mineral resources may be materially affected if mining, metallurgical, or infrastructure factors change from those currently anticipated at the Hycroft Mine. Estimates of inferred mineral resources have significant geological uncertainty and it should not be assumed that all or any part of an inferred mineral resource will be converted to the measured or indicated categories. Mineral resources that are not mineral reserves do not meet the threshold for reserve modifying factors, such as estimated economic viability, that would allow for conversion to mineral reserves. The Hycroft Mine contains a large precious metals deposit, based on measured and indicated mineral resource size. The mineral resource estimates were prepared by, and are the responsibility of, IMC, as set forth in the 2023 Hycroft TRS.

The following description of the Hycroft Mine’s measured, indicated and inferred mineral resources does not purport to be complete and is subject to, and qualified in its entirety by reference to, the full text of the 2023 Hycroft TRS, incorporated by reference as Exhibit 96.1 to this 2024 Form 10-K.

Notes:

•Cutoffs grades were determined by income – process cost = NPR = NSR – Process Opex. Cutoff grade is the minimum grade required for a mineral to be economically mined and processed to retrieve the metal for commercial sale. The cutoff grade for Hycroft is determined by assessing each mine block for gold and silver content and then applying a cost for extraction of these metals from that block by employing commercial mining practices and using the crushing, grinding, flotation, pressure oxidation and cyanide leaching circuit for oxidized flotation concentrate process to create a gold/silver doré bar. Process costs include the environmental practices for placing waste and tailing material in properly designed facilities that can be remediated in the future.

•Numbers in the table have been rounded to reflect the accuracy of the estimate and may not sum due to rounding.

•Mineral resources are contained within a computer-generated optimized pit. Total material in that pit is 3.631 billion tons.

•All units are imperial. Ktons refers to 1,000 short tons or 2,000 lbs. Gold and silver grades are in troy ounces/short ton.

Mineral resources were developed based on a conventional computer-based block model of the deposit and the application of open pit optimization software to determine the mineralization with reasonable expectation of economic extraction. Each block was evaluated to determine which process provides the best net return after operating cost. The two processes identified were:

•Run-of-Mine (“ROM”) cyanide heap leaching of oxide ore; and

•milling, flotation and acid pressure oxidation of sulfide and transitional ores followed by cyanide leach and processing in a Merrill-Crowe facility.

Other assumptions used to develop measured, indicated and inferred mineral resources were:

•assumed prices for gold of $1,900 per ounce and for silver of $24.50 per ounce;

•recoveries for gold and silver were estimated by process type:

◦milling, flotation and acid pressure oxidation was 76% overall of the fire assays for gold and 76% for fire assays for silver; and

◦ROM heap leaching was 75% for cyanide soluble gold and 12.2% for fire assay silver.

•base mining cost of $1.45 per ton with an additional incremental $0.016/ton applied to each bench below the 4660 level;

•variable ore processing costs based on geometallurgical domains and sulfur content; and

•general and administrative cost $0.44 per ton.

See Table 11-14 in Section 11 of the 2023 Hycroft TRS for a more detailed presentation of the economic parameters for mineral resource estimation.

Mineral resources are not mineral reserves and detailed economic considerations have not been applied. Modifying factors for mine and process design have not been applied.

Internal Controls and Material Assumptions

IMC developed and updated the block model for the 2023 Hycroft TRS. Below is the summary of the work and checks they used to develop the block model.

The Hycroft Mine resource model includes data from 1981 to 2022 and includes 5,601 holes, representing 2,588,826 feet of drilling. The drill hole collar locations are shown in the 2023 Hycroft TRS and later in this text. In the 2023 Hycroft TRS, there are 5,532 drill holes in the resource model area of which 188 have been drilled to define stockpiles or the Crofoot leach pad.

In addition to drilling activity, the Company has also conducted geophysical surveys, soil and rock chip sampling programs, field mapping, historical data compilation, and regional reconnaissance at the Hycroft Mine site. These efforts are designed to improve the understanding of the known mineralization, as well as provide data for further exploration of the greater property position.

A soil sampling grid was conducted over the Vortex and Brimstone areas historically (1,797 samples) and was extended approximately 5,200 feet north and 29,600 feet south of the mine in 2011-2012 (1,834 samples). The soil sampling program was conducted primarily along the East Fault exposure, which is a primary ore-controlling feature at Vortex and Brimstone. Soil samples are taken on an evenly spaced grid, and screened for coarse material and wind-blown material, resulting in a fraction between 2 mm and 180 µm being prepped for analysis. These samples are considered representative of local soil geochemistry and are used to guide the regional exploration effort.

Rock chip sampling has been conducted both historically in the active mine area, and on a regional basis (2008-present). A database of 2,416 samples has been compiled, covering the greater land position. Au values range from 0 to 0.372 ppm, while Ag values range from 0 to 71.8 ppm. Rock chip samples have been taken on most outcrops, with a focus on alteration and potential mineralization. These samples are used as a guide to exploration and are point samples only.

The land position has been surveyed with both gravity and induced polarity (“IP”) geophysical techniques by Hycroft. The current ground-based gravity survey covers approximately 130 square miles, centered on the mine site. Gravity indicates several structural features and density changes. Gravity has also defined the basin edge to the west, approximately four miles west of the Brimstone Pit.

Ground IP surveys were run over the mine site and Vortex in 2007 and extended outward in 2011 to cover approximately 24 square miles. The survey results focus on chargeability anomalies, that potentially identify sulfide material (> approximately 1.5%) at depth, and resistivity anomalies, that potentially identify silicification at depth.

In 2022, a hyperspectral imaging flyover of the Hycroft property was conducted by SpecTIR Advanced Hyperspectral Solutions. Both Longwave Infrared (“LWIR”) and Shortwave Infrared (“SWIR”) imaging were collected with the intent of helping identify key minerals on the surface to focus reconnaissance mapping and soils programs.

Field mapping was historically carried out in all active mine areas. Mapping focuses on structure, bedding, joints, lithology, and alteration. The near-mine data is incorporated into the three-dimensional geology model, while the regional work is focused on defining exploration targets for future drilling. A regional geology map covering the land position was compiled in 2012.

The drill hole database was assembled over many years by multiple companies using at least four different drill methods.

There are stockpiles and historical leach pads at the Hycroft Mine that are within the block model area. Many of those have been drilled after the original excavation of hard rock by sonic or rotary methods. The stockpile holes have been used to estimate the stockpile and leach pad areas, they have not been used to estimate in-situ rock. In total, the Hycroft Mine database contains 5,601 drill holes with 500,214 sample intervals. Within the area of the block model, there are 5,532 drill holes with 490,452 drill intervals amounting to 2,537,335 feet of drilling.

The block model was verified by several methods before being used to determine mineral resource, including:

•detailed Visual Checks of Drilling versus Block Estimates;

•swath Plots; and

•IMC Smear Check.

IMC completed visual checks on plan and section for all of the estimated variables in the model. In addition to IMC visual checks, the Hycroft engineering and geology team on site also reviewed the model and assisted IMC with identifying and correcting coding issues prior to finalizing the block model.

Swath plots are a practice now common among resource modelers to provide a visual indication if the block model follows the grade trends indicated by the supporting data and if there is any observable local bias in the block grade estimation.

Quality assurance and quality control methods utilized in the 2023 Hycroft TRS included the use of a test by IMC to understand the amount of grade smoothing within the block model and to confirm that the model grades are not high biased, referred to internally as the “smear check.”

The procedure utilized by IMC was as follows:

•a range of cutoff grades were selected for the check process, generally bracketing the potential planning cutoff grades;

•for each cutoff grade being tested, the blocks above cutoff were identified;

•all composites contained within those blocks were identified;

•the average grade of the composites and blocks were tabulated; and

•the percentage of the contained composites less than cutoff were calculated.

Cautionary Note to U.S. Investors Regarding Mineral Resources. The mineral resource estimates included herein or incorporated by reference herein, including in the 2023 Hycroft TRS, have been prepared in accordance with the requirements of the Modernization Rules as set forth in subpart 1300 of Regulation S-K which became widely applicable on January 1, 2021. These disclosures differ in material respects from the prior requirements set forth in Industry Guide 7, including in that mineral resource information was not permitted and mineral resources have been calculated in accordance with the provision of subpart 1300 of Regulation S-K. These standards differ significantly from the disclosure requirements of Industry Guide 7 in that mineral resource information contained herein may not be comparable to similar information disclosed by U.S. companies that have not implemented the Modernization Rules promulgated by the SEC. Under SEC standards, mineralization, such are mineral resources, may not be classified as a “mineral reserve” unless the determination has been made that the mineralization could be economically and legally produce or extracted at the time of the reserve determination. The term “economically,” as was used in the SEC’s Industry Guide 7 definition of mineral reserves, means that profitable extraction or production has been established or analytically demonstrated in a feasibility study to be viable and justifiable under reasonable investment and market assumptions. The term “legally” as used in the SEC’s Industry Guide 7 definition of mineral reserves, does not imply that all permits needed for mining and processing have been obtained or that other legal issues have been completely resolved. However, for a reserve to exist, we must have a justifiable expectation, based on applicable laws and regulations, that issuance of permits or resolution of legal issues necessary for mining and processing at a particular deposit will be accomplished in the ordinary course and in a timeframe consistent with our current mine plans. The terms “Mineral Resource,” “Measured Mineral Resource,” “Indicated Mineral Resource,” and “Inferred Mineral Resource” are defined and used in accordance with the Modernization Rules. You are specifically cautioned not to assume that any part or all of the mineral deposits (including mineral resources) in these categories will ever be converted into mineral reserves, as defined by the SEC. You are further cautioned that, except for any portion of mineral resources, as applicable, classified as mineral reserves, mineral resources do not have demonstrated economic value. Inferred mineral resources have a high degree of uncertainty as to their existence as to whether they can be economically or legally mined. Under the Modernization Rules, estimates of inferred mineral resources may not form the basis of an economic analysis. It cannot be assumed that all or any part of an inferred mineral resource will ever be upgraded to a higher category. A significant amount of exploration must be completed in order to determine whether an inferred mineral resource may be upgraded to a higher category. Therefore, you are cautioned not to assume that all or any part of an inferred mineral resource exists, that it can be economically or legally mined, or that it will ever be upgraded to a higher category. Likewise, you are cautioned not to assume that all or any part of measured or indicated mineral resources will be upgraded to mineral reserves.

Technical Report Summaries and Qualified Persons

The scientific and technical information concerning the Hycroft Mine in this 2024 Form 10-K has been reviewed and approved by third-party “Qualified Persons” under the Modernization Rules, including Ausenco, IMC, and WestLand. For a description of the key assumptions, parameters and methods used to estimate mineral resources included in this 2024 Form 10-K, as well as data verification procedures and a general discussion of the extent to which the estimates may be affected by any known environmental, permitting, legal, title, taxation, sociopolitical, marketing, or other relevant factors, please review the 2023 Hycroft TRS.