MIRAMAR RESOURCES LIMITED — Regulatory Filings 2026

Mar 9, 2026

ASX: M2R | 10 March 2026

SHALLOW HIGH-GRADE GOLD IN GIDJI RC DRILLING

• 3m @ 9.45g/t Au from 47m (incl. 1m @ 23.11g/t Au) at Highway Prospect

• Awaiting further assays and further drilling planned to evaluate potential for a shallow gold resource(s)

Miramar Resources Limited ( ASX:M2R , “Miramar” or “the Company”) is pleased to advise that RC drilling at the Company’s 80%-owned flagship Gidji JV Gold Project (“Gidji” or “the Project”), located 15 kilometres north of Kalgoorlie, has intersected shallow high-grade gold at the Highway Prospect.

The Highway Prospect is one of several gold discoveries made at Gidji by Miramar since 2020 and is located immediately west of the Goldfields Highway (Figure 1).

Miramar’s Managing Director, Ms Marion Bush, said the team is encouraged by the results to date and keenly await the remaining assays from the RC drill programme.

“This high-grade intersection at Highway is the best gold result from the Project to date and increases the potential for a shallow gold resource at Gidji, where our proximity to numerous gold processing plants aids our ability to monetise any deposit. The intersection is surrounded by several other aircore and / or RC gold intersections with space for infill drilling, so we hope it’s the beginning of a significant discovery.

It’s an exciting time for us. Over the coming days and weeks, we expect to receive the remaining assays from this drilling programme, most of which will come from the Highway Prospect. We’ll then start planning further drilling to determine the scale of the opportunity at Highway.”

The RC drilling campaign comprised 19 holes for a total of 2431 metres and included angled holes testing beneath significant aircore intersections at the high-priority Blackfriars and Highway gold targets and shallower vertical holes aimed at assessing the potential for an initial JORC-compliant gold resource. Most holes intersected supergene gold anomalism at or directly under the base of the Gidji Paleochannel, as shown in Table 2.

Drilling at the Highway Prospect has outlined an altered diorite body, with abundant sulphides, sandwiched between more mafic units. GJRC043 , at the southern end of the Prospect , intersected 3m @ 9.45g/t Au from 47-50m, including 1m @ 23.11g/t Au, in a sample containing a mixture of basal gravels and weathered diorite (Figures 2 and 3).

The Company will wait to receive all assays from this programme, and, pending results, will plan further drilling including bedrock testing and / or resource drilling.

The Company is also preparing for an auger drilling campaign in late Q1 / early Q2 at the Company’s 100% owned Chain Pool Project in the Gascoyne region of WA, where Miramar has outlined high-grade copper, lead and silver mineralisation, along with extensive sedimentary exhalative (SEDEX)-style alteration, at the Joy Helen prospect.

For more information on Miramar Resources Limited, please visit the company’s website at www.miramarresources.com.au, follow the Company on social media (Twitter @MiramarRes and LinkedIn @Miramar Resources Ltd) or contact:

Marion Bush Margie Livingston Managing Director Ignite Communications info@miramarresources.com.au margie@ignitecommunications.com.au

This announcement has been authorised for release by Ms Marion Bush, Managing Director, on behalf of the Board of Miramar Resources Limited.

ASX: M2R | ABN 34 635 359 965 | Unit 1, 22 Hardy Street, South Perth, Western Australia 6151 PO Box 810, South Perth WA 6951 | miramarresources.com.au | info@miramarresources.com.au | +61 (8) 6166 6302

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Figure 1. Gidji JV Gold Project showing RC drill holes (blue dots) completed at the Blackfriars and Highway Prospects.

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Figure 2. Cross section through the Highway Prospect showing 3m wide zone of high-grade gold mineralisation in hole GJRC043.

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----- Start of picture text -----

23.11g/t Au 2.54g/t Au 2.69g/t Au
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Figure 3. GJRC043 chip tray showing the high-grade gold intersection straddling the boundary between the base of the Gidji Paleochannel and the underlying weathered diorite.

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Table 1: Drill Hole Information

Hole Id	Target	Easting	Northing	Collar RL	Dip	Azimuth	EOH Depth
GJRC034	Blackfriars	350848	6612805	346	-60	54	226
GJRC035		351259	6612339	348	-60	54	124
GJRC036		351189	6612269	347	-60	54	155
GJRC037		350628	6612522	346	-60	54	124
GJRC038	Highway	350804	6611694	346	-60	54	168
GJRC039		350784	6611767	346	-60	54	167
GJRC040		350739	6611525	347	-60	54	96
GJRC041		350843	6611749	346	-90	0	66
GJRC042		350770	6611819	346	-90	0	72
GJRC043		350900	6611698	346	-90	0	72
GJRC044	Blackfriars	350656	6612616	346	-90	0	66
GJRC045		350698	6612581	346	-60	54	210
GJRC046	Marylebone	351114	6612923	346	-60	54	180
GJRC047	Blackfriars	350721	6612523	346	-90	0	60
GJRC048	Highway	350731	6611910	346	-90	0	72
GJRC049		350696	6612050	346	-90	0	78
GJRC050		350665	6611933	346	-60	54	162
GJRC051		350476	6612171	345	-60	54	168
GJRC052		350380	6612355	346	-60	54	165

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Table 2: Significant Results >0.25g/t Au

Hole Id	From	To	Interval	Aug/t	Comments
GJRC034	53	55	2	0.46
GJRC035	57	58	1	0.69
GJRC036	56	57	1	0.32
GJRC037	59	61	2	0.71
GJRC038	55	59	4	0.38
GJRC039	58	61	3	0.71
GJRC040	54	59	5	0.60
GJRC041	51	55	4	0.28
GJRC042	49	51	2	0.51
GJRC043	47	50	3	9.45	Incl. 1m@ 23.11g/t Au
GJRC044	43	44	1	1.08
GJRC045	51	52	1	0.36
GJRC046	63	64	1	0.25
GJRC047					Assayspending
GJRC048					Assayspending
GJRC049					Assayspending
GJRC050					Assayspending
GJRC051					Assayspending
GJRC052					Assayspending

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About the Gidji JV Project

Miramar’s 80%-owned Gidji JV Project is located approximately 15 kilometres north of Kalgoorlie-Boulder and is one of three projects held by Miramar in the world-class Eastern Goldfields Province of WA.

The Project contains approximately 15 kilometres of strike of the Boorara Shear Zone, which hosts several gold deposits along strike in either direction.

Despite the Project being surrounded by multiple gold mining and processing operations, it has been underexplored due to extensive shallow transported cover, and the Gidji Paleochannel which crosscuts the most prospective basement geology.

Since commencing exploration in late 2020, Miramar has made multiple large new supergene gold discoveries with systematic aircore drilling and has defined multiple bedrock targets for deeper drilling.

Miramar believes there is potential for the discovery of a new gold camp, with multiple gold deposits, within the Gidji JV Project.

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COMPETENT PERSON STATEMENT

The information in this report that relates to Exploration Targets or Exploration Results is based on information compiled by Allan Kelly, a “Competent Person” who is a Member of The Australian Institute of Geoscientists. Mr Kelly is the Technical Director of Miramar Resources Ltd. He is an employee of Miramar Resources Ltd and holds shares and options in the company.

Mr Kelly has sufficient experience that is relevant to the style of mineralisation and type of deposits under consideration and to the activity being undertaken to Qualify as a “Competent Person” as defined in the 2012 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’.

Mr Kelly consents to the inclusion in this Announcement of the matters based on his information and in the form and context in which it appears.

Information on historic and recent exploration results from the Gidji JV Project, including JORC Table 1 and 2 information where applicable, was included in the following ASX Announcements:

• 4/8/2025 Multiple Gold Zones in First 8 Mile Drill Hole

• 18/7/2025 High-Grade Gold Discovery in First 8 Mile Drill Hole

• 15/7/2025 Gidji Drilling & SAM Survey Highlight Bedrock Gold Targets

• 23/6/2025 SAM Survey underway at Gidji JV

• 13/6/2025 Drill for Equity Agreement at Gidji JV Gold Project

• 12/5/2025 Gidji Drilling Delivers More Gold Results

• 3/7/2024 Potential Extension to 8 Mile Dam Gold Deposit Outlined by IP Survey

• 3/5/2024 Gidji JV Exploration Update – Amended

• 22/4/2024 Goldfields Exploration Update

• 9/4/2024 Gold & Nickel Exploration Update

• 2/2/2023 Large Exploration Target Highlights Gidji JV Gold Potential

• 10/8/2022 Significant gold results from “Highway” Target

• 1/8/2022 Further High-Grade Gold Results from Gidji JV

• 30/6/2022 Multiple High-Grade Gold Results from Gidji JV

• 29/6/2022 Gidji JV Project – Exploration Update

• 26/5/2022 Gidji JV Exploration Update

• 3/5/2022 Miramar to accelerate Gidji drilling following $2.4M raising

• 13/4/2022 Potential for Multiple Large Deposits at Gidji JV

• 8/4/2022 Multiple High-Grade Gold Results from Gidji JV

• 10/3/2022 Nickel Sulphide Targets Identified at Gidji JV

• • 1/2/2022 RC Drilling Underway at Marylebone

• 10/1/2022 New Target at Gidji JV Increases Camp-Scale Potential

• 22/12/2021 Gidji drilling results indicate potential new gold camp

• • 25/11/2021 Gidji JV Exploration Update • 7/10/2021 Significant Gold Results from Gidji JV Drilling

• 23/09/2021 Multiple High-Grade Gold Results from Marylebone

• • 13/09/2021 Gidji JV Tenements Granted

• 2/08/2021 Aircore Drilling Grows Marylebone

• • 29/06/2021 New Aircore Results Upgrade Gidji Targets • 3/06/2021 RC and Aircore Drilling Underway at Gidji JV • 11/05/2021 Aircore Drilling Extends and Upgrades Marylebone

• 6/05/2021 Gidji JV Project Exploration Update

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About Miramar Resources Limited

Miramar Resources Limited is an active, WA-focused mineral exploration company exploring for gold, copper and Ni-Cu-PGE deposits in the Eastern Goldfields and Gascoyne regions of WA.

Miramar aims to create shareholder value through discovery of high-quality mineral deposits.

The Company’s Board has a track record of successful discovery, development and production within Australia, Africa, and North America.

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JORC 2012 Table 1 – Gidji JV RC Drilling

Section 1 Sampling Techniques and Data

(Criteria in this section apply to all succeeding sections.)

Criteria	JORC Code explanation	Commentary
Sampling	• Nature and quality of sampling (e.g. cut	•Samples collected from 1m sample piles
techniques	channels, random chips, or specific	•Sampling commences from 4m above the
	specialised industry standard measurement	Base of Alluvium (BOA) to end of hole
	tools appropriate to the minerals under	•Samples average 2.5kg in weight
	investigation, such as downhole gamma
	sondes, or handheld XRF instruments, etc).
	These examples should not be taken as
	limiting the broad meaning of sampling.
	• Include reference to measures taken to
	ensure sample representivity and the
	appropriate calibration of any measurement
	tools or systems used.
	• Aspects of the determination of
	mineralisation that are Material to the Public
	Report.
	• In cases where ‘industry standard’ work has
	been done this would be relatively simple
	(eg ‘reverse circulation drilling was used to
	obtain 1 m samples from which 3 kg was
	pulverised to produce a 30 g charge for fire
	assay’). In other cases more explanation
	may be required, such as where there is
	coarse gold that has inherent sampling
	problems. Unusual commodities or
	mineralisation types (eg submarine nodules)
	may warrant disclosure of detailed
	information.
Drilling	• Drill type (eg core, reverse circulation, open-	•RC drilling with hammer bit
techniques	hole hammer, rotary air blast, auger,
	Bangka, sonic, etc) and details (eg core
	diameter, triple or standard tube, depth of
	diamond tails, face-sampling bit or other
	type, whether core is oriented and if so, by
	_what method, etc). _
Drill	• Method of recording and assessing core	•Comments recorded for samples with low
sample	and chip sample recoveries and results	recovery
recovery	assessed.
	• Measures taken to maximise sample
	recovery and ensure representative nature
	of the samples.
	• Whether a relationship exists between
	sample recovery and grade and whether
	sample bias may have occurred due to
	preferential loss/gain of fine/coarse material.
Logging	• Whether core and chip samples have been	•Samples were logged for colour,
	geologically and geotechnically logged to a	weathering, grain size, geology, alteration
	level of detail to support appropriate Mineral	and mineralisation where possible
	Resource estimation, mining studies and
	metallurgical studies.
	• Whether logging is qualitative or quantitative
	in nature. Core (or costean, channel, etc)
	photography.
	• The total length and percentage of the

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Criteria	JORC Code explanation	Commentary
	relevant intersections logged.
Sub-	• If core, whether cut or sawn and whether	•1m samples approximately 2.5kg of sample
sampling	quarter, half or all core taken.	•Sampling commences from 4m above Base
techniques	• If non-core, whether riffled, tube sampled,	of Alluvium (BOA)
and sample	rotary split, etc and whether sampled wet or	•Dry samples collected direct from cyclone
preparation	dry.	splitter
	• For all sample types, the nature, quality and
	appropriateness of the sample preparation
	technique.
	• Quality control procedures adopted for all
	sub-sampling stages to maximise
	representivity of samples.
	• Measures taken to ensure that the sampling
	is representative of the in situ material
	collected, including for instance results for
	field duplicate/second-half sampling.
	• Whether sample sizes are appropriate to
	thegrain size of the material being sampled.
Quality of	• The nature, quality and appropriateness of	•Samples were assayed using a 50g fire
assay data	the assaying and laboratory procedures	assay with analysis by Intertek
and	used and whether the technique is	•QAQC samples inserted at frequency of 4
laboratory	considered partial or total.	QAQC samples (i.e. standard, blank
tests	• For geophysical tools, spectrometers,	duplicate) per 100 samples
	handheld XRF instruments, etc, the
	parameters used in determining the analysis
	including instrument make and model,
	reading times, calibrations factors applied
	and their derivation, etc.
	• Nature of quality control procedures
	adopted (eg standards, blanks, duplicates,
	external laboratory checks) and whether
	acceptable levels of accuracy (ie lack of
	bias) andprecision have been established.
Verification	• The verification of significant intersections	•No verification
of	by either independent or alternative
sampling	company personnel.
and	• The use of twinned holes.
assaying	• Documentation of primary data, data entry
	procedures, data verification, data storage
	(physical and electronic) protocols.
	• _Discuss any adjustment to assay data. _
Location of	• Accuracy and quality of surveys used to	•Hole collar locations were recorded with a
data points	locate drill holes (collar and down-hole	handheld GPS in MGA Zone 51S
	surveys), trenches, mine workings and other	•RL was also recorded with handheld GPS
	locations used in Mineral Resource	but accuracy is variable
	estimation.
	• Specification of the grid system used.
	• Quality and adequacy of topographic
	control.
Data	• Data spacing for reporting of Exploration	•Drill holes located to test beneath aircore
spacing	Results.	intersections
and	• Whether the data spacing and distribution is	•Drill spacing is not sufficient to determine a
distribution	sufficient to establish the degree of	Mineral Resource
	geological and grade continuity appropriate
	for the Mineral Resource and Ore Reserve
	estimation procedure(s) and classifications
	applied.
	• Whether sample compositing has been

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Criteria	JORC Code explanation	Commentary
	applied.
Orientation	• Whether the orientation of sampling	•Drill holes were located to test beneath
of data in	achieves unbiased sampling of possible	aircore intersections
relation to	structures and the extent to which this is	•It is likely that the mineralized structures
geological	known, considering the deposit type.	trend at a different orientation to the
structure	• If the relationship between the drilling	regional geology
	orientation and the orientation of key
	mineralised structures is considered to have
	introduced a sampling bias, this should be
	assessed and reported if material.
Sample	• The measures taken to ensure sample	•Samples were transported from site directly
security	security.	to the laboratory by Miramar staff
Audits or	• The results of any audits or reviews of	•No audits have been undertaken
reviews	sampling techniques and data.

Section 2 Reporting of Exploration Results

(Criteria listed in the preceding section also apply to this section.)

Criteria	JORC Code explanation	Commentary
Mineral	• Type, reference name/number, location	•The exploration was conducted on
tenement and	and ownership including agreements or	E26/214 which is owned 80% by Miramar
land tenure	material issues with third parties such as	Goldfields Pty Ltd and 20% by Thunder
status	joint ventures, partnerships, overriding	Metals Pty Ltd
	royalties, native title interests, historical	•Miramar Goldfields Pty Ltd is a wholly
	sites, wilderness or national park and	owned subsidiary of Miramar Resources
	environmental settings.	Limited
	• The security of the tenure held at the time	•Miramar has an exploration JV with
	of reporting along with any known	Thunder Metals Pty Ltd
	impediments to obtaining a licence to
	operate in the area.
Exploration	• Acknowledgment and appraisal of	•Exploration has been previously
done by other	exploration by other parties.	completed by other companies including
parties		Goldfields and KCGM, and included auger
		drilling, RAB, aircore and limited RC
		drilling.
Geology	• Deposit type, geological setting and style	•The target is Archaean greenstone-hosted
	of mineralisation.	mesothermalgold mineralisation.
Drill hole	• A summary of all information material to	•See Table 1 and 2.
Information	the understanding of the exploration	•Figure 1 shows a plan view of collar
	results including a tabulation of the	location of GJRC043 in relation to other
	following information for all Material drill	drilling.
	holes:
	o easting and northing of the drill hole
	collar
	o elevation or RL (Reduced Level –
	elevation above sea level in metres) of
	the drill hole collar
	o dip and azimuth of the hole
	o down hole length and interception
	depth
	o hole length.
	• If the exclusion of this information is
	justified on the basis that the information is
	not Material and this exclusion does not
	detract from the understanding of the
	report, the Competent Person should
	clearly explain why this is the case.

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Criteria	JORC Code explanation	Commentary
Data	• In reporting Exploration Results, weighting	•Intervals reported over 0.25g/t Au with
aggregation	averaging techniques, maximum and/or	maximum of 1 sample of internal dilution.
methods	minimum grade truncations (eg cutting of	•1 metre samples collected from 4m above
	high grades) and cut-off grades are usually	the Base of Alluvium (BOA) to end of hole.
	Material and should be stated.
	• Where aggregate intercepts incorporate
	short lengths of high-grade results and
	longer lengths of low-grade results, the
	procedure used for such aggregation
	should be stated and some typical
	examples of such aggregations should be
	shown in detail.
	• The assumptions used for any reporting of
	metal equivalent values should be clearly
	stated.
Relationship	• These relationships are particularly	•No assumptions about true width or
between	important in the reporting of Exploration	orientation of mineralisation can be made
mineralisation	Results.	from the current programme
widths and	• If the geometry of the mineralisation with
intercept	respect to the drill hole angle is known, its
lengths	nature should be reported.
	• If it is not known and only the down hole
	lengths are reported, there should be a
	clear statement to this effect (eg ‘down
	_hole length, true width not known’). _
Diagrams	• Appropriate maps and sections (with	•See attached Tables and Figures
	scales) and tabulations of intercepts
	should be included for any significant
	discovery being reported. These should
	include, but not be limited to a plan view of
	drill hole collar locations and appropriate
	sectional views.
Balanced	• Where comprehensive reporting of all	•Figure 1 shows drill plan and Figure 2
reporting	Exploration Results is not practicable,	shows drill section
	representative reporting of both low and	•Table 2 shows significant gold results
	high grades and/or widths should be	>0.25g/t Au.
	practiced to avoid misleading reporting of
	Exploration Results.
Other	• Other exploration data, if meaningful and	•No other relevant data
substantive	material, should be reported including (but
exploration	not limited to): geological observations;
data	geophysical survey results; geochemical
	survey results; bulk samples – size and
	method of treatment; metallurgical test
	results; bulk density, groundwater,
	geotechnical and rock characteristics;
	potential deleterious or contaminating
	substances.
Further work	• The nature and scale of planned further	•Further RC and/or diamond drilling
	work (eg tests for lateral extensions or	planned
	depth extensions or large-scale step-out
	drilling).
	• Diagrams clearly highlighting the areas of
	possible extensions, including the main
	geological interpretations and future
	drilling areas, provided this information is
	not commercially sensitive.

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