THUNDER MOUNTAIN GOLD INC

Summary

The Company, including its subsidiaries, owns mining rights, claims, and properties in the mining areas of Nevada and Idaho. These include the South Mountain Property in Idaho ("South Mountain Project") and the Trout Creek Property in Nevada ("Trout Creek Project"). The maps below in Figure 1 and Figure 2 show the locations of the properties.

Figure 1 - South Mountain Project Location Map

Figure 2 - Trout Creek Property

Trout Creek Project, Lander County, Nevada

The Trout Creek Project is a highly prospective gold Exploration Stage Property operated by the Company and located along the western flank of the Shoshone Mountain Range in the Reese River Valley in Lander County, Nevada. The Project is located approximately 155 air miles northeast of Reno, Nevada, or approximately 20 miles south of Battle Mountain, Nevada, in Sections 10, 11, 14, 16, 21, 22, 27; T.29N.; R.44E. Mount Diablo Baseline & Meridian, Lander County, Nevada. Latitude: 40 23' 36" North, Longitude: 117 00' 58" West. The property is generally accessible year-round by traveling south from Battle Mountain Nevada on state highway 305, which is paved.

Property Ownership and Acreage

The Trout Creek Project consists of 26 (approximately 533 acres) unpatented lode mining claims owned by Thunder Mountain Resources, Inc. ("TMRI"), our wholly-owned subsidiary. The Company must pay annual maintenance payments to the Bureau of Land Management ("BLM") to maintain its rights to the property. BLM annual maintenance fees increased to $200.00 per claim, which became effective for the 2024 assessment year.

Geology & Mineralization

The Trout Creek Project target is anchored by a regional gravity anomaly on a well-defined northwest-southeast trended break in the alluvial fill thickness and underlying bedrock. Previous geophysical work in the 1980s revealed an airborne magnetic anomaly associated with the same structure, and this was further verified and outlined in 2008 by Company personnel, with consultation from Jim Wright - Wright Geophysics using a ground magnetometer. The target is covered by alluvial fan deposits of generally unknown thickness, shed from the adjacent Shoshone Range, a fault block mountain range composed of Paleozoic sediments of both upper and lower plate rocks of the Roberts Mountains thrust.

Wright Geophysics also conducted a ground gravity survey and CSMAT over the pediment target area and this provided insight into the gravel-bedrock contact as well as defining the favorable structural setting within the buried bedrock. An untested drill target was identified under the gravel pediment along these structures, and the geophysics showed that the bedrock was within 500 feet of the surface, which is reasonable depth for exploration drilling and potential mining if a significant mineralization is encountered.

Present Condition, Work Completed and Exploration Plans

Other than the geophysical data described above, the Company has not performed any significant work at the Trout Creek Project, and the Company does not plan to conduct any work on the Trout Creek Property in 2025. The Company will instead focus its efforts on its South Mountain Project. There are no significant workings on the property, and the property is without known resources or reserves.

Permits and Facilities

There are no permits associated with this property, and there are no processing plants or other available facilities located on the property. There are currently no environmental permits required for exploration work on the property. In the future, a plan of operations may be required by the Bureau of Land Management to conduct exploration and sampling at the property.

INDIVIDUAL PROPERTIES - MATERIAL OPERATING PROPERTIES

THE SOUTH MOUNTAIN PROJECT

SPECIAL NOTE TO READERS: The South Mountain Project is a material property as defined by Regulation S-K Subpart 1300 (S-K 1300) issued by the Security and Exchange Commission (SEC). All other properties described in this Annual Report are immaterial under S-K 1300.

Figure 3. Location of South Mountain Project

South Mountain Project Summary Overview

The Company operates the South Mountain Project ("South Mountain" or the "South Mountain Project" or the "Property" or the "Project") comprised of an underground mine and adjacent exploration properties located approximately 70 miles southwest of Boise, Idaho (see Figure 3 above). It is a polymetallic Exploration Stage Property focused on high-grade zinc, silver, gold, and copper. Mineralization was first discovered at South Mountain in 1868, with subsequent mining activity leading to the discovery of the oxidized silver, gold, zinc and lead veins. The Project was intermittently mined from the late 1800s to the late 1960s. According to historical smelter records, approximately 53,642 tons of mineralized material have been mined by previous operators. Because the South Mountain Project is an Exploration Stage property, the Company had no aggregate annual production from the South Mountain Project in the last three years.

The Company owns 100% the South Mountain Project, through its wholly-owned subsidiaries-Thunder Mountain Resources, Inc., South Mountain Mines, Inc. and Thunder Mountain Resources, Inc. The South Mountain Project originally consisted of 17 patented mining claims (approximately 327 acres) located in Owyhee County in southwestern Idaho. After the Company's purchase of the property, it staked an additional 21 unpatented lode mining claims and obtained mineral leases on 489 acres of adjoining private ranch land, and an additional 13 unpatented claims on approximately 260 acres in 2024.

The South Mountain Project is largely located on and surrounded by private land. Future agreements with individual private landowners, along with the existing easements and right of ways, may be necessary to establish infrastructure such as roads and power lines. The private land setting greatly simplifies and streamlines the permitting and approval process. Owyhee County approved Conditional use Permits ("CUPs") for the mine site and mill site in 2013, which approvals may need to be further extended prior to commencing work. Both the mine and the mill site are located on private land, and as such, require no other permit authorization for surface disturbance, other than any approvals from the County to further extend and / or update the previously approved CUPs.

Also included in the South Mountain Project area is a 360-acre millsite, not contiguous with the mining claims, which was purchased by THMG in 2013. The millsite is located approximately 6.8 road miles from the main mine area, with access provided by a 1.2-mile haul road between the millsite and Owyhee County South Mountain Road. Plans to construct a mill were approved by Owyhee County, as described above through the CUPs, which may be subject to further extensions and updates.

Summary Mineral Resources at End of the Fiscal Year Ended December 31, 2024

For a summary of South Mountain's Mineral Resources at the end of the fiscal year ended December 31, 2024, see Table 1 below.

Reserves

The Company has no proven or probable mineral reserves on any of its properties at the end of the fiscal year ended December 31, 2024.

Property and Location

The South Mountain Project is located approximately 70 miles southwest of Boise, Idaho at Latitude 42° 44' 41.65" North and Longitude 116° 55' 13.48" West (see Figure 3 above). The Project was intermittently mined from the late 1800s to the late 1960s, and its existing underground workings remain intact and well maintained. Historic production at the Project has largely come from high-grade massive sulfide zones that remain open at depth and along strike. According to historical smelter records, approximately 53,642 tons of mineralized material has been mined to date. These records also indicate average grades; 14.5% Zn, 11.63 opt Ag, 0.063 opt Au, 2.4% Pb, and 1.4% Cu were mined.

The South Mountain Project mine site is accessible by Highway 95, driving south from the Boise area to Jordan Valley, Oregon, then by traveling southeast approximately 22 miles back into Idaho, via Owyhee County Road, a dirt road improved to within 4 miles of historic mine site. The last 4 miles up the South Mountain Mine Road is unimproved dirt road. The property is accessible year-round to within 4 miles of the property. Snow removal is required to access the property during the winter months, but the property is accessible from May through October without the need for snow removal. There is power distribution within 4 miles of the site. The climate is considered high desert. The Company has water rights on the property, and there is a potable spring on the property that once supplied water to the main mining camp.

The community nearest to the Project is Jordan Valley, Oregon, roughly 24 miles to the northwest of the South Mountain Project area. Jordan Valley hosts a regional population of about 450 and offers limited standard municipal amenities. The nearest major supply center is the city of Nampa, roughly 100 miles northeast of the South Mountain Project area. Commercial air and rail services are both available in Nampa, which is served by the Nampa Municipal Airport and Union Pacific's Northwest Corridor rail line. Ample skilled and unskilled labor can be found in Nampa and the greater Boise-Nampa metropolitan area. There are no onsite personnel currently employed at the property.

Property Ownership

The Company owns 100% of the outstanding stock of Thunder Mountain Resources, Inc., a Nevada Corporation. Thunder Mountain Resources, Inc. owns 100% of the outstanding stock of South Mountain Mines, Inc. (SMMI), an Idaho Corporation. Thunder Mountain Resources, Inc. completed the direct purchase of 100% ownership of South Mountain Mines, Inc. on September 27, 2007, which consisted of 17 patented mining claims (approximately 327 acres) located in Owyhee County in southwestern Idaho. After the purchase, Thunder Mountain Resources staked 21 unpatented lode mining claims and obtained mineral leases on 489 acres of adjoining private ranch land.

The current land package at the South Mountain Project consists of 18 patented mining claims encompassing approximately 346 acres, 36 acres of private land, 34 unpatented mining lode claims covering approximately 550 acres, and approximately 489 acres of leased private land. In addition, the project owns 360 acres of private land for its mill site that is not contiguous with the mining claims.

Thunder Mountain Gold Inc. purchased the Project in 2007, after selling its main asset in central Idaho and donating thousands of acres at that site to conservation. The Company continues to advance the South Mountain Project, investing in excess of $20M since its purchase.

Present Condition

The South Mountain Project is an underground mine accessed by a primary horizontal adit. Existing surface rights are sufficient for all presently proposed development and operations activities. Existing infrastructure within the Project area includes six cabin-style bunkhouses (circa 1975) and a small number of other historic wooden structures, as well as a large fabric-sided equipment maintenance and storage facility situated near the entrance to the Sonneman adit. Drill core and various supplies and equipment are stored on-site in a series of locked, Connex-style storage containers located along the main access road just above the bunkhouse cabins.

Electrical power is currently supplied by portable diesel generators. A three-phase power line could be established by upgrading about 15 miles of the existing two-phase line, with the construction of an additional 4.5 miles of new line from the county road to the mine site. Line power from Idaho Power's distribution line to the mill site would require roughly one mile of new line construction and another 17 miles of existing line upgrades, along with some transformer and line upgrades near Jordan Valley, Oregon.

Potable water is available within the Project area from several existing groundwater springs. Water for milling operations is expected to be provided by an onsite well, though a pipeline could potentially be engineered to carry water to the mill from mine workings, providing water for milling operations as well as a means for dewatering the mine.

Geology & Mineralization

Rock types within the South Mountain Project area are comprised of an isolated exposure of metasedimentary and intrusive rock, surrounded by younger upper-Tertiary volcanic and sedimentary units of the Owyhee volcanic field. One large northeast trended fault runs through the South Mountain property and is informally named the Golconda Structure. This structure physiographically separates exposures of the two types of mineralization observed at the property. The current interpretation of mineralization extent on the Project shows a strike length of approximately 2,250 ft. The mineralized bodies dip approximately 50° southwest from surface (between 7,500 ft. and 7,300 ft.) to a depth of 5,900 ft. depth, or approximately 1,500 vertical ft. Mineralization thickness is variable, but the DMEA Zone (defined below and depicted in Figure 5 below) massive sulfide is the most significant mineralized body with thicknesses between 10 ft. and 20 ft. Mineralization is separated into discrete high-grade bodies along strike. Mineralized continuity within those bodies is oriented down-dip and along plunge. Mineralization remains open down dip, and further exploration could result in more mineralized bodies being identified along strike or within currently undrilled parts of the Laxey Marble.

Historically, two styles of mineralization were identified and have been worked by mines on the South Mountain Project: Pb-Ag replacement vein or fissure vein deposits, and skarn-hosted, Zn-rich, polymetallic massive sulfide bodies.

The Pb-Ag veins were the first target of mining activity within the Project area. These veins proved to be amenable to early-day mining practices as the oxidized portions consisting of argentiferous lead carbonate were easily smelted. The oxidized portions of the veins are relatively shallow, on the order of 70 to 80 ft (Bowes, 1985). The unoxidized components of these veins include the sulfides pyrrhotite, arsenopyrite, sphalerite, galena, chalcopyrite, and pyrite. The sulfide minerals occur within quartz, calcite, and chlorite gangue. The Pb-Ag veins range in width from narrow stringers to 8 feet wide, and follow a predominate northeast trend with steep, southwesterly to vertical dips. The veins are open-space fillings along previous existing structures, and evidence can also be seen of localized replacement along adjacent bedding planes and fracture surfaces. The high silver values at South Mountain are present in solid solution in galena and tennantite-tetrahedrite whereas at least some of the locally high-grade gold values appear to occur in association with the early arsenopyrite.

The primary deposit being explored at South Mountain is now classified as a Carbonate Replacement Deposit ("CRD"). The CRD deposit classification commonly provides for both massive sulfide and skarn hosted mineralization. Skarns are coarse-grained metamorphic rocks composed of calcium-iron-magnesium-manganese-aluminum silicate minerals that form by replacement of carbonate-bearing rocks (in most cases) during contact or regional metamorphism and metasomatism. CRD deposits are also commonly associated with many other types of magmatic-hydrothermal deposits in mineral districts. The South Mountain CRD is potentially zoned relative to the N to NE trended faults.

Distal Pb-Ag veins and replacement bodies mined in the late 1800's may be the vertical and lateral equivalent to the main CRD system. Thus, numerous surface exposures of Pb-Ag veins at South Mountain could indicate the potential for significant Zn-Pb-Ag mineralization at depth.

History

Mineralization in the form of gold-bearing quartz veins was first discovered at South Mountain in 1868, with subsequent mining activity leading to the discovery of the oxidized silver-lead veins. The South Mountain Consolidated Mining and Smelting Company purchased the principal mines in the district, including the earliest workings of the South Mountain Project, in 1874.

The Exploration Company of California completed development of the Sonneman, Golconda, and Laxey levels of the South Mountain mine in 1929 through 1931, concentrating primarily on the Laxey ore zone. In 1940 through 1946, the International Smelting and Refining Co. (Anaconda) began metal production from the Laxey ore zone. Approximately 53,635 tons of ore were direct shipped to a smelter in Tooele, Utah during this time.

The Exploration Company of California completed exploration and development of the Sonneman, Golconda, and Laxey levels in the early 1930's, concentrating primarily on the Laxey ore zone. In 1940 and continuing through 1946, the International Smelting and Refining Co. (Anaconda) began metal production from the Laxey ore zone as part of the strategic materials effort for World War II. During this same timeframe, the Defense Minerals Exploration Administration ("DMEA") evaluated the Project for its strategic zinc potential, overseeing mining and exploration of the Project both during and for some time after the War. The Texas shaft was reactivated by the South Mountain Mines Partnership in 1950 and was worked for a period of roughly 5 years.

The Texas shaft was active from 1950 to 1955 under the South Mountain Mines ("SMM") partnership. The partnership constructed a single-stage (copper-lead circuit) flotation mill capable of handling 150 tons per day, and reportedly extracted 6,703 tons of ore. DMEA, through Anaconda, continued to evaluate the property for its strategic zinc potential during this same time frame and established the DMEA Zone ("DMEA Zone") as depicted in Figure 5 below.

In 1956, the property was leased for two years to the Potash Company of America, which operated sporadically until 1968, when the 17 patented claims, which comprise the patented claim block of the present- day South Mountain Project, were purchased by W.A. Bowes, Inc.

The W.A. Bowes Company developed the property from 1977 until the early 1980's when it was purchased by an east coast investment group who formed South Mountain Mining, Inc. Following purchase of the property, W.A. Bowes remained as managing operator. The property was acquired by Thunder Mountain Resources, Inc., a wholly owned subsidiary of THMG, in September 2007 following due diligence work on the title, environmental considerations, and geology.

W.A. Bowes managed the Project from 1977 until the mid-1980's, conducting geophysical, soil and rock chip sampling and analysis programs.

After acquisition of the Project by an eastern money interest in the mid-1970s, South Mountain Mining ("SMM") was incorporated and proceeded to conduct expansive exploration in the form of tunneling and underground and surface drilling. SMM personnel have verbalized to THMG personnel that approximately $6 million was spent at the Property by them during this period, culminating in preparation of an internal feasibility study.

SMM collected 60 channel samples in the Sonneman drift to delineate mineralization in the DMEA and Texas zones. Orientations for these samples are either along the length of the drift, which is approximately along strike of the deposit, or across the drift. The channel sampling successfully defined high grade mineralization for the Project.

Historic drilling on the property began in the 1960's when Potash Corporation drilled 10 core holes of unknown size totaling 1,293 ft and 24 longholes totaling 2,078 ft. All drilling was conducted across the length of the Laxey level and successfully tested the vertical continuity of mineralization. In 1971, Austral Oil drilled 8 core holes totaling 7,551 ft north of the Project. The Austral hole intervals were logged for geology but were not assayed for metal content. In the period from 1975 to 1986, SMM drilled a total of 161 holes. Of these holes, 117 were longholes (blastholes) totaling 4,817 ft. Thirty-nine were core holes totaling 5,467 ft. The remaining 5 holes were shallow air track holes, which were not assayed, totaling 486 ft. The drilling by SMM largely defined the extent of mineralization for the Project prior to drilling operations by, or on behalf THGM. See a depiction of previously reported rib sampling in Figure 4 Below.

Figure 4: Plan View of Sonneman & Laxey Levels,

showing locations of previously reported rib sampling

Work Completed and Exploration Plans

Exploration (and development) activities conducted at South Mountain since 2008 include:

• Adjoining property evaluation and acquisition

• Title work for the patented claims and private land parcels

• Surveying the claim boundaries,

• Rehabilitation of the Laxey and Sonneman drifts, most to a production level (12 ft by 12 ft),

• As-built survey of the Laxey and Sonneman drifts,

• Channel sampling of the Sonneman drift at the intersections of massive sulfide mineralization,

• Geologic mapping and geochemical sampling specific to an intrusive breccia target, and

• A ground magnetics survey as well as compiling and reprocessing public domain geophysical surveys, and

• A pulse electromagnetic ("PEM") survey completed in September 2022.

The procedures, parameters, and general results of each of the exploration efforts listed above are summarized below and detailed descriptions can be found in Exhibit 96.1, the Initial Assessment Technical Report Summary for the South Mountain Project, Owyhee County, Idaho U.S.A, with an effective date of December 31, 2023.

Channel Sampling of the Sonneman Drift:

THMG collected seven channel samples in the Sonneman Drift to delineate mineralization in various parts on the Sonneman level. Samples were essentially chip channels taken with rock picks and/or hammer and chisel. Care was taken to make sure that the amount along the run was distributed evenly. Samples were bagged and shipped to ALS Chemex in Reno, Nevada. The results from the sampling confirmed mineralization at the Project.

Geochemical Sampling:

Approximately three miles of access roads and drill sites were constructed in 2010 during exploration of the gold breccia. A campaign of road cut sampling was undertaken on the new roads as they were completed. Three sets of samples were obtained along the cut bank of the road. Channel samples were taken on 25-foot, 50-foot or 100-foot intervals, depended upon the nature of the material cut by the road with the shorter spaced intervals being taken in areas of bedrock. A majority of the samples contained anomalous gold values and in addition to confirming the three anomalies identified by soils sampling.

Rock chip samples collected by THMG staff from the intrusive breccia and the surrounding rocks. Additional rock chip samples were collected by Kinross geologists in 2009 during an evaluation of the property. Kinross collected rock chip samples from the breccia at South Mountain that produced gold values closely matching the rock chip geochemical values collected by THMG staff. The gold values increase in rock chip samples collected from along the contact of the intrusive breccias.

A soil sample program was conducted in the area of the intrusive breccia on South Mountain by THMG staff. Soil samples collected from a 2008 orientation sample grid over the breccia zone. During the 2009 field season, an expanded soil grid was completed over the breccia zone.

Also in 2010, Newmont Mining Corp. submitted two bulk samples for gold characterization and modal mineralogy. The samples comprised approximately 1.5 kilograms of -10-mesh rejects from ALS Chemex.

Geophysics:

In 2010, J.L. Wright Geophysics compiled several geophysical datasets:

• Airborne magnetic data ("AMAG");

• Airborne radiometric data ("ARAD"); and

• The gravity data ("GRAV").

The gravity data indicates the property to be located at an intersection of two large scale structural features. Density variations, responsible for the gravity anomalies, are inferred to be related to large scale basement rock changes. Results from the survey show complex magnetic patterns produced by both lithologic and alteration features.

In July 2013, a ground magnetic survey was completed over a portion of the South Mountain property by MaGee Geophysical Services LLC. The objective was to delineate structures and lithologies proximal to known gold and base metal mineralization.

In September 2022, Crone Geophysics based in Toronto, Canada completed a pulse electromagnetic ("PEM") survey covering a portion of the Project area. The survey is initially centered on the South Mountain Mine, then follows the marble unit to the north with the objective of delineating massive sulfides. The 2022 geophysics survey suggests the presence of additional exploration targets beyond the extent of currently defined mineralization.

Drilling:

In 2019, 2020, and 2021, SMMI completed a total of fifty-two (52) NQ diameter core drillholes totaling 16,382 ft. as well as two HQ diameter core drillholes totaling 3,541 ft. The drilling completed in 2021 was from surface and targeted the down-dip extension of the DMEA. The 2021 drilling intersected the mineralization approximate to the true thickness of the deposit. The 2020 drillholes were surveyed down-hole using a GyroMaster non-magnetic multi-shot tool. Between 2008 and 2018, THMG drilled twenty-seven (27) holes for a total of 16,600 ft. Twenty of the holes are diamond core holes, and the remaining seven are RC.

THMG completed two core holes in 2008, TX-1 and DMEA2. TX-1 was drilled from surface, oriented south-southwest and inclined 60° targeting Texas mineralization. DMEA2 was drilled from surface, and oriented vertically. The drillhole was surveyed down-the-hole every 10 ft using a Deviflex multishot survey tool. The drillhole intersected DMEA zone mineralization at depth.

In 2010, THMG completed seven (7) RC drillholes with the prefix LO. The drillholes were vertically oriented and not surveyed down-the-hole. LO-01 through LO-05 targeted the intrusive breccia defined by geologic mapping and rock chip samples across a strike length of 4,440 ft. These drillholes were assayed for gold only and intersected several low-grade intercepts (Table 7-7).

In 2013, the Company's drilling program consisted of twelve (12) drillholes targeting three mineralization zones from surface and surveyed down-the-hole every 10 ft using a Deviflex multishot survey tool. This drilling orientation is not preferred for intersecting mineralization across the true thickness of the deposit; however, three (3) of the four (4) drillholes did intersect massive sulfide mineralization associated with the Texas zone. The 2013 drilling also included six underground core drillholes with the prefix DM2UC13. The program was successful in defining the geometry and confirming the grades of the DMEA massive sulfide zone.

For more information on the drilling results, see the Initial Assessment Technical Report Summary for the South Mountain Project, Owyhee County, Idaho U.S.A, attached hereto as Exhibit 96.1.

Mineral Resource Estimate

The Company completed an updated mineral resource estimate (the "MRE") with an effective date of December 31, 2023, to meet the requirements of Subpart 1300 of Regulation S-K, which incorporated results from the surface diamond drilling program conducted in 2021 at the South Mountain Project. The MRE includes an increased resource for the Project while maintaining the high-grade mineralization. The MRE was prepared in accordance with Subpart 1300 of Regulation S-K by Hard Rock Consulting, LLC, based in Aurora, Colorado, U.S.A. For more information, see Exhibit 96.1, the Initial Assessment Technical Report Summary on the South Mountain Project, Owyhee County, Idaho U.S.A., prepared for the Company by Hard Rock Consulting, LLC ("HRC"), the Qualified Person ("QP"). The South Mountain Project is without known reserves, and the proposed programs are exploratory in nature.

Highlights of Mineral Resource

• Measured & Indicated ("M&I"): 223,000 tons grading 9.02% Zinc ("Zn"), 4.27 ounces per ton ("opt") Silver ("Ag"), 0.059 opt Gold ("Au"), 0.64% Copper ("Cu"), and 0.94% Lead ("Pb").

• Inferred: 959,000 tons grading 7.56% Zn (14% increase in Zn lbs), 5.67 opt Ag (14.10% increase in Ag ounces), 0.037 opt Au (3.3% increase in Au ounces), 0.80% Cu (14.5% increase in Cu lbs), and 1.06% Pb (25.4% increase in Pb lbs).

• The DMEA Zone in the model was extended an additional 250 feet down dip and remains open.

This latest round of drilling completed during the late fall of 2021 proves the continuation of the down plunge extension of the DMEA Zone at depth. This zone remains open in both directions. All the of the drill results have now been in incorporated into the MRE for the South Mountain deposit. The increase in Measured and Indicated tons are the result of updated metal prices and mining costs. Surface drilling completed in 2021 accounts for approximately 8% of the increase in Inferred tons, while the remaining 7% increase is due to updated metal prices and mining costs.

Table 1 below provides the Mineral Resource Statement for the Project in U.S. units with details of the modeling methodology and cut-off grades applied to the mineral resource. Figure 5 illustrates the principal areas where the South Mountain deposit has been expanded from the historical MRE that was completed in 2021.

Table 1. South Mountain Mineral Resource Statement as of December 31, 2023

1. The undiluted in-situ mineral resources are reported at an underground mining Net Smelter Return ("NSR") cut-off of** 97.50 $US/Short Ton**. The NSR calculation is based on the assumptions stated in the following footnotes 2 - 5.

2.Metal prices are based on the 36-month moving average as of September 29, 2023, and are**$1,800/oz for Au**,$23.50/oz for Ag,$1.00/lb. for Pb,$1.35/lb. for Zn, and**$4.00/lb. for Cu**.

3. An assumed mining cost of**$65/short ton**, process costs of**$25/short ton**, and general and administrative costs of**$7.50/short ton**

4. Massive Sulfide typemetallurgical recoveries and payables are52.25% for Au,71.25% for Ag,71.40% for Zn,66.50% for Pb, and49.00% for Cu and a total smelter cost of**$33.29**.

5. Skarn typemetallurgical recoveries and payables are71.25% for Au,80.75% for Ag,51.00% for Zn,47.50% for Pb, and87.70% for Cu, and a smelter cost of**$7.24**.

6. Rounding may result in apparent differences when summing tons, grade and contained metal content. Tonnage and grade are in U.S. Customary units. Prices are in $US.

Figure 5: 3D Perspective view inclined 200 looking north-north-east,

indicating the areas of the expanded mineral resource, with zones that are open.

Qualified Person Statement for the Mineral Resource Estimate

Hard Rock Consulting, LLC is responsible for the South Mountain Project MRE, with an effective date of December 31, 2023. HRC is a Qualified Person as defined by S-K 1300 and is independent of Thunder Mountain Gold, Inc. and South Mountain Mines, Inc. HRC estimated the mineral resources based on drill hole and channel sample data constrained by geologic boundaries using an Ordinary Krig algorithm. The Geologic Model and Mineral Resource Estimate were completed using Leapfrog Geo® Software version 2023.1.1. HRC based the MRE on other assumptions that can be found in the footnotes to Table 1, above.

Permits

The Project is largely on, and surrounded by private land, and as such, the permitting and environmental aspects of the Project are expected to be straightforward. Permits are currently in place for underground and surface exploration and development activities as follows:

In 2007, the BLM contracted with North Wind Environmental (North Wind) to design a reclamation program for the estimated 16-17,000 tons of tailings situated solely on BLM land below the Sonneman mine portal and waste rock dump area. North Wind completed the outlined reclamation work in October 2007 by providing diversion ditches for a small side-drainage to Williams Creek, shaping and capping with both synthetic HDPE plastic and soil and fencing the area to exclude livestock access. The reclaimed area was also seeded then covered with straw mat material to minimize erosion.

As part of their due diligence in 2007, THMG conducted water sampling at the mine portals and various other locations along Williams Creek. They also contracted with Enviroscientists, Inc. of Reno, Nevada, to conduct an environmental data review and site assessment. Based on the completed state and federal site work and environmental evaluations, THMG determined that environmental liabilities associated with the Project are minimal, and therefore an acceptable risk, given the history of state and federal and environmental evaluations and remediations in and around the site. There are no current applicable federal or state environmental orders regarding the site.

THMG also completed water quality sampling programs on a quarterly basis from 2012 through 2014, during that phase of exploration and pre-development work. Several sample stations were established along the stream from the area below the Sonneman waste rock dump and historic tailings repository. This baseline sampling has continued through and into the current exploration program through the fourth quarter of 2020. No significant variations in quality, trends or concerns were noted in the sampling.

In 2020, THMG and their independent consultant, WEC, updated the existing site-wide Storm Water Pollution Prevention Plan (SWPPP) under guidance of the EPA NPDES Stormwater Discharges from Industrial Activities-EPA’s 2015 Multi-Sector General Permit (MSGP).

The Idaho DEQ manages the regulatory compliance of this program as of beginning in July of 2021.

The current site conditions related to underground water and the mine portal are as follows:

1. As mentioned above, Williams Creek has been placed in a 660 feet of 48-inch galvanized culvert through the Sonneman waste rock dump, starting above the mine workings, and continuing below the workings, in order to protect Williams Creek, and to ensure compliance with the National Pollutant Discharge Elimination System (NPDES/IPDES) Stormwater Permit.

2. There is no direct or open surface channel that routes water from underground tunnels or drifts, out of the mine and into Williams Creek. All water underground is considered meteoric and finds its way down through and below mine infrastructure. There is no way in which to determine if or how this water supplements the flow in Williams Creek.

3. The surface water sampling baseline data that has been collected for about 14 years shows no upstream or downstream influence from constituent analysis on Williams Creek.

4. Even though Williams Creek is routed through a 48-inch culvert for 660 feet to protect the water, it still crosses over and through the host rock and mineralized zones that are part of the system of mineralization.

If mining operations in the future require dewatering in the mining areas, then an IPDES Permit would be required for point source discharges from the mining operation to "waters of the United States." Likely point discharges would include treated mine drainage, treated net precipitation from the tailings storage facility, and any other discernible or discrete point source associated with mining and processing at the site. In addition, the project would be subject to performance standards for new sources for its respective industrial source category. The Project would have to demonstrate that it is applying the best available control technology to meet applicable water quality standards. The permit application must be submitted at least 180 days prior to the approved discharge.

Scoping has been conducted by management, and several independent contractors have been invited to submit proposals for air quality baseline monitoring and permitting. Permits to construct and then later to operate are expected to be required for both the mine and mill and would be submitted with information developed from further mine and mill planning to include engineering studies and equipment lists.

In November 2019, South Mountain Mines, Inc./Owyhee Gold Trust filed an application with the Owyhee County Planning and Zoning Commission requesting a second four-year time extension for previously approved conditional use permit 213-13. That permit was originally issued in 2013 to Owyhee Gold Trust LLC, granting approval to establish an industrial milling operation on approximately 360 acres of land located in an agricultural zone. The first four-year time extension was applied for and granted in 2015. The subject parcels are located in the NE¼ of Section 23, the SW¼ of the NE¼, and the SE¼ of Section 14 Township 7 South, Range 5 West, Boise Meridian, Owyhee County, Idaho. Following a duly noticed hearing on December 11, 2019, the Commission granted the time extension of four (4) years, subject to the special conditions set forth in the original approved conditional use permit.

In 2023, the Commission granted the Company a one (1) year extension with the existing CUPs, with the understanding that the Company will update and submit a new application that is more specific to the current exploration activities. SMMI keeps the County up to date and informed with annual presentations to the Owyhee County Commissioners.

Internal Controls Over Exploration and Mineral Resource Estimations

Exploration drilling programs in 2019, 2020, and 2021 are performed using industry-standard quality control methods for drilling, logging, sampling, and analytical procedures. The laboratory used by THGM for sample preparation and analyses is: ALS USA Inc., 4977 Energy Way, Reno, NV 89502. ALS meets all requirements of International Standards ISO/IEC 17025:2017 and ISO 9001:2015. All ALS geochemical hub laboratories are accredited to ISO/IEC 17025:2017 for specific analytical procedures. Gold was analyzed using a 30g charge and fire assay methods with an atomic absorption finish. Ag, Cu, Pb Zn, as well as 29 additional elements were then analyzed were analyzed using a 0.25g sample by four acid digestion with an induced plasma couple mass spectroscopy finish. Gold results exceeding 10ppm and silver results exceeding 100ppm were reanalyzed using a 30g charge and fire assay methods with a gravimetric finish. Zinc, Copper and Pb results exceeding 10,000ppm, were reanalyzed using 0.4g sample with four-acid digestion.

The drilling competed by THMG in 2019, 2020, and 2021 included three types of QA/QC samples including blanks, standards, and duplicates into the sampling program. The combined THMG drilling program totaled 1,537 sampled intervals and 209 recorded QA/QC samples representing approximately 14% of the sampled intervals. All standards are commercially certified and have been prepared in advance by accredited labs. HRC reviewed blank, standard, and duplicates and found the results from QA/QC samples to be acceptable.

Drill core, chip trays, and pulp rejects are stored in locked, Connex-style shipping containers located at the Project site. Coarse rejects are temporarily stored in a secure rental storage unit in Elko, Nevada, and are periodically hauled to the mill site for long term storage in the gated, covered storage area. Samples are continuously monitored by SMMI personnel from the time of collection through delivery to the lab. THMG employs standard chain of custody procedures, including formal COC documentation, during all phases of sample transport.

The sampling methods meet industry standard practices and are adequate for mineral resource estimation. Sampling was conducted by appropriately qualified personnel under direct supervision of appropriately qualified geologists. Sample collection procedures used meet industry best practices. Sample preparation procedures meet industry best practices. QA/QC results produce acceptable results. Security procedures are consistent with industry standards. The databases are managed in a secure area using modern, commonly used software by trained staff. The staff are experienced in the nuances of narrow vein mining and treat the model with their experience in mind.

Drillhole logs are completed using Microsoft Excel and are only accessible by mine technical staff and timestamped at the last time of change. Geologic interpretation and solid modeling, and mineral resource estimation are accomplished using Leapfrog. Hard copies of the most critical log data are printed from the "log form" tab. Electronic copies are kept by THMG and both electronic and hard copies are in the possession of Thunder Mountain Gold. This redundancy is to ensure against any data loss.

Risks and uncertainties exist in the quantification of the spatial distribution on mineralization. These risks are inherent in the estimation of mineral resources. Samples themselves have uncertainty related to sampling collection errors and the homogeneity of the deposit. Wider spaced drilling has more uncertainty than closely spaced drilling. High grade outlier samples will tend to overestimate the metal content of the mineral deposit. These underlying factors and risks were considered in the final conclusion of the mineral resource estimate.

Additional Project Highlights

On September 17, 2024**,the Company completed remodeling its geological data and historical reports for the South Mountain Project utilizing acquired induced polarization (IP) data, airborne magnetic geophysical survey data, and copper-in-soil geochemical survey (Geochem) results.Based on this analysis, the Company staked an additional 13 unpatented mining claims,covering approximately 260 acres of Bureau of Land Management (BLM) land.**

On December 13, 2023, the Company completed a land purchase of an additional 56 acres of strategic land at the Company`s South Mountain Project. The land is a combination of both patented and private land, with full mineral rights, and was previously leased by the Company in prior years. The parcel is contiguous with the South Mountain patented claims and is important to the future development of the Texas Zone. This land acquisition covers a gap in the main mine area and eliminates any outside ownership within the main mine area.

On September 5, 2022, Crone Geophysics based in Toronto, Canada initiated a time domain pulse electromagnetic (PEM) survey over a portion of the South Mountain Mines. The objective of the survey is to delineate massive sulfide mineralization within a marble unit bounded by Paleozoic schists. Historic mining on the area was conducted on massive sulfide mineralization associated hosted by the Laxey Marble within the survey area. Bowes (1985) describes the sulfide bodies as pipe-like dipping to the southwest at 40-50° and raking 50°. The survey was completed on November 7, 2022. In addition to the PEM survey, property scale topography, geology and ground magnetics will be included to provide supporting data for the interpretation. The digital products include raw data, intermediate processed products, and final products in several data formats.

In May of 2021, the Company and its project team completed an updated Mineral Resource Estimate ("MRE"), incorporating results from Phase 1 and 2 underground diamond drilling programs at the South Mountain Project. The updated MRE includes a substantially increased resource for the Project while maintaining the high-grade nature of the mineralization.

Later in 2021, the Company embarked on a phase 3 program at South Mountain with the objective to significantly expand the scale of the current MRE at South Mountain (See Summary of the MRE above), testing and establishing the down depth extent of mineralization on the DMEA Zone. The DMEA Zone is the largest known body of mineralization on the Property, containing the majority of tonnage in the current MRE, and the mineralized zone remains open at depth.

Based on the last two phases of underground drilling, the surface core drilling, and all the historical exploration data available, the Company believes there is the potential to expand the down-plunge extensions of the mineral resource with this new phase of surface drilling at the Property.