Exhibit 99.1

Quarterly Activities Report for the period ending
30 September 2026

HIGHLIGHTS

Golden Gate drilling completed

Completed 42 diamond core holes for 12,236m across Golden Gate, targeting the scale and extent of gold and tungsten mineralisation within the Horse Heaven Project in Idaho, USA1.

Gold mineralisation extended at Golden Gate South

Initial results extended known gold mineralisation at least 2,000m south of Golden Gate North, including 305.7m @ 0.64 g/t Au from surface in HH-GG26-003C1.

Results from six holes identified gold mineralisation across an approximately 600m-wide zone on the southernmost drill section, with less continuous mineralisation on the western side2.

Higher-grade intervals included 7.2m @ 2.35 g/t Au from 58.1m, including 1.0m @ 14.8 g/t Au from 62.1m in HH-GG26-004C; and 10.2m @ 1.83 g/t Au from 58.05m, including 1.0m @ 7.0 g/t Au from 58.05m in HH-GG26-005C2.

U.S. market access

Commenced trading on Nasdaq on 9 September 2026 under ticker RML. Each American Depositary Shares (“ADS”) represents 200 ordinary shares. No capital raising accompanied the listing3.

Subsequent events

On 26 October 2026, assay results from Golden Gate North confirmed 500m (1,600 ft) extension of gold zone mineralisation4.

Resolution Minerals Limited (ASX: RML; Nasdaq: RML) (“Resolution” or the “Company”) is pleased to provide an overview of activities for the period ending 30 September 2026 (“Quarter” or “Reporting Period”).

During the Quarter, Resolution completed its 2026 diamond drilling program at Golden Gate and reported further gold exploration results from Golden Gate South. The Company also commenced trading on Nasdaq, complementing its primary ASX listing and supporting its U.S. market strategy as it advances the Horse Heaven Antimony-Tungsten-Gold-Silver Project in Idaho, USA.

HORSE HEAVEN PROJECT

During the quarter, Resolution completed the 2026 Golden Gate diamond drilling program.

On 11 September 2026, Resolution announced completion of 42 diamond core holes totalling 12,236m (40,144 ft), with an average hole depth of approximately 290m. The program tested extensions of gold mineralisation and tungsten targets across Golden Gate North and Golden Gate South.

The program also targeted tungsten mineralisation around historical mine workings and a broad tungsten-in-soil anomaly at Golden Gate South. Gold and tungsten assay results remained outstanding for much of the program at the time of the September updates.

All drill core has been logged, and final samples have dispatched to the laboratory for analysis. Assays remain pending for 36 holes and are expected to be released in the coming weeks.

Initial assays extend gold mineralisation to the south

During the Quarter, Resolution reported gold assays from the six diamond holes at Golden Gate South. Initial results from the first three drill holes (reported on 24 August 2026) intersected gold mineralisation, extending known mineralisation at least 2,000m south of Golden Gate North and supporting further evaluation of the broader Golden Gate system. gold intersections reported on 24 August and restated on 15 September 2026. The holes reported in the announcements confirm the extension of gold mineralisation at Golden Gate South.

During the Quarter, Resolution reported results from HH-GG26-004C, HH-GG26-005C and HH-GG26-006C. These holes were drilled on the same east–west section as the first three holes at the southern end of Golden Gate South. Gold mineralisation was identified in all six holes, defining an approximately 600m-wide mineralised zone on this section.

Highest gold grade intercepts to date in drilling

Individual drill samples show the highest gold grades recorded to date in drilling at Horse Heaven in drill holes HH-GG26-004C and 005C, suggesting higher grade “feeder zones” (Figure 1, 2).

Drill hole HH-GG26-004C: 9.2 metres @ 0.53 g/t Au from 18.3 downhole;

Drill hole HH-GG26-005C: 10.2 m @ 1.83 g/t Au from 58.05m downhole

Drill hole HH-GG26-006C: 3.77 metres @ 1.53 g/t Au from 298.8m downhole;

To date, the Company has reported six drill holes which were designed to test the southern extension of the Golden Gate Shear Zone, which at this location is developed within sheared and faulted Cretaceous granodiorite of the Idaho Batholith. The different drill orientations were selected to evaluate the geometry and geological controls of the target zone. Gold mineralisation appears to be related to steeply dipping features that splay off the key regional structure, the Golden Gate Shear Zone.

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Figure 1: Resolution’s Golden Gate South – Location of drill holes over coloured gold-in-soil-samples and interpreted mineralisation and alteration with six reported drill hole gold assays as histograms (red) and location of Cross section in Figure 2. Gold-in-soil-samples emphasises the continuity of gold mineralisation between drilled areas (from ASX announcement 11 June 2025).

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Figure 2: Resolution’s Golden Gate South – Cross section of six reported drill hole gold assays as colours from blue to red with significant gold intervals.

CORPORATE

Nasdaq trading commenced

Resolution’s American Depositary Shares commenced trading on the Nasdaq Capital Market on Wednesday, 9 September 2026 (U.S. time) under the ticker RML. Each ADS represents 200 ordinary shares. The secondary listing complements the Company’s primary ASX listing, where its ordinary shares continue to trade.

The listing followed effectiveness of the Company’s Form 20-F registration statement and Nasdaq approval. The Bank of New York Mellon was appointed depositary, custodian and registrar for the ADR program. No capital raising was associated with the Nasdaq listing.

The listing is intended to broaden access for U.S. investors and support Resolution’s U.S. market strategy. It does not itself provide project funding or assure future funding outcomes.

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SUBSEQUENT EVENTS

Golden Gate North gold results

In after balance date events (26 October 2026), Resolution reported gold assays from the first three Golden Gate North holes of the 2026 season, comprising HH-GG26-031C, HH-GG26-032C and HH-GG26-039C.

Wide intercepts of almost continuous gold mineralisation: Gold mineralisation in drill hole assays extends from surface almost to the bottom of two drillholes, HH-GG26-031C & 032C, (Figure 3,4) with best gold intercepts:

HH-GG26-032C: 324 metres (1,060 ft) @ 0.49 g/t gold (Au) from surface, with best gold intervals of:

HH-GG26-031C: 322 metres (1,055 ft) @ 0.37 g/t Au from surface, with best gold interval of:

HH-GG26-039C: 134.2 m (440 ft) @ 0.40 g/t Au from surface, with best gold intervals of:

Results confirm a mineralised gold zone over 500m (1,600ft) at Golden Gate North open-ended. Mineralisation is open in both directions, and at least 200m (650ft) wide and a true depth of at least 300m (990ft) at Golden Gate North (Figures 3,4). Prior gold in soil sample results potentially extend mineralisation a further 500m northwards and also to the south (Figure 5). Drill results extend mineralisation down dip and support prior reported gold intercepts in a 2025 drill hole HH-GG25-006C from the same drill site, of:

15.6m @ 1.10 g/t Au from 166.7m and 133.7m @ 0.55g/t Au from 376.5m (see ASX announcement 17 February 2026)

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Figure 3: Resolution’s Golden Gate North – Location of drill holes 2026 and 2025 with reported drill hole gold assays for drill holes in 2026 and 2025 as histograms (red) and location of Cross section in Figure 2, with interpreted gold mineralised zone (Pale yellow) and interpreted fault/shear zones. Note the zone is open ended to NE and SW, with a gold-in-soil anomaly extending a further 500m to the north (see Figure 5).

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Figure 4: Resolution’s Golden Gate North – Cross section of two reported drill holes with gold assays as histograms in red, overlain on 2025 drillhole HHGG25-006, with significant gold intervals and interpreted gold mineralised zone.

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Figure 5: Resolution’s Golden Gate within the Horse Heaven Project – Coloured gold results in soil samples demonstrate the potentially mineralised package of rocks. Location of drill holes overlain on gold-in-soil-samples with the location of Cross section in Figure 2. Gold-in-soil-samples emphasises the continuity of gold mineralisation between Golden Gate South and Golden Gate North and between drilled areas (from ASX announcement 11 June 2025).

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Resolution’s near-term focus is completing the processing of drill results from the 2026 drill program, with a further 32 holes to be released. In parallel, the Company is progressing the permitting for the planned 2027 exploration programs at both Antimony Ridge and Golden Gate. In addition, progress is being made on developing a plan to process existing tungsten stockpiles, and ongoing metallurgical testing is advancing.

CORPORATE

As at 30 September 2026, Resolution Minerals held $1.64 million in cash and cash equivalents, providing funding support for planned exploration and development programs.

RML’s Appendix 5B includes expenditure amounts of $0.59 million in item 6.1 related to payment of director fees to executive and non-executive directors and $1.30 million in item 6.2 related to metallurgical and exploration support services provided by director related entities.

During the September Quarter, the Company expended $6.34 million on exploration activities. This expenditure primarily represents costs associated with drilling at Horse Heaven and related expenditures and labour for technical consultants.

$10.0 million Loan Facility

RML has entered into an Agreement with Harbour Capital Opportunities Fund Pty Ltd (Harbour) managed by Oakley Capital Partners Pty Limited (Oakley Capital), whereby Oakley Capital will source funds via a non-dilutive Loan Facility for up to $10 million. The first $2.5 million will be drawn down immediately with discretion for an additional $2.5 million to be drawn at Resolution’s election. The remaining $5.0 million can be drawn down in $2.5 million tranches, on mutual agreement. The terms of the Loan Facility are:

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TENEMENT TABLE

Authorised for release by the Board of Resolution Minerals Ltd.

For further information, please contact:

The Company confirms it is not aware of any new information or data that materially affects the information cross referenced in this announcement. The Company confirms that the form and context in which the Competent Person’s findings are presented have not been materially modified from the original announcements.

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Rule 5.5

Appendix 5B

Mining exploration entity or oil and gas exploration entity
quarterly cash flow report

Compliance statement

Notes