Guardian Metal Resources PLC Announces Positive Tempiute Tungsten Drilling Results

Positive drilling across Phase I and Phase II is prompting underground rehabilitation at Tempiute, aimed at supporting a potential initial tungsten resource.

Rhea-AI Summary

Guardian Metal Resources (GMTL) reported positive drilling results from its Tempiute tungsten project in Nevada, including initial Phase II resource drilling assays and final Phase I regional exploration data.

Phase II aims for 46 diamond drillholes; 28 are complete and assays from the first four show broad mineralization, highlighted by hole TP26-046 with 27.9m @ 0.27% WO₃ from 68.6m and 92.0m @ 0.34% WO₃ from 102.5m, including 12.7m @ 0.53% WO₃. Phase I regional work saw 20 of 41 holes intersect strong tungsten, including TP25-021 with 32.4m @ 0.26% WO₃ and 1.7m @ 2.00% WO₃. On these results and visual mineralization in additional holes, the company will start rehabilitating historical underground workings in October 2026 to allow underground drilling. The project remains at the exploration stage with no Mineral Resource or Reserve yet defined and significant technical, permitting and financing risks disclosed.

Positive

• Phase II drilling: 28 of planned 46 holes completed, with assays from first four showing broad mineralization including 92.0m @ 0.34% WO₃ in TP26-046.
• High‑grade intervals: TP26-046 includes 12.7m @ 0.53% WO₃ and TP25-021 includes 1.7m @ 2.00% WO₃, indicating locally strong tungsten grades.
• Phase I hit rate: 20 of 41 regional holes intersected strong tungsten mineralization, suggesting a broader mineralized system beyond historic workings.
• Underground rehab decision: engagement of a contractor and rehabilitation expected to start October 2026 to enable more efficient underground drilling.
• Near‑surface opportunity: company is assessing permitting to mine a near‑surface mineralized lode on patented claims for potential earlier tungsten extraction.

Negative

• No Mineral Resource or Reserve: Tempiute remains an exploration‑stage property with insufficient data yet to define a Mineral Resource estimate.
• High project risk: any accelerated extraction may proceed without a feasibility study and is subject to significant technical, permitting and financing risks.
• Variable drill results: several Phase I holes returned low‑grade or sub‑2m WO₃ intercepts, and one Phase I hole showed no visual tungsten mineralization.
• Geological uncertainty: true thicknesses of all reported intercepts are not yet known and many Phase II assays are still pending.

Market Context

GMTL was down 1.78% before publication, while the announcement reported positive Tempiute drilling r...

Analysis

GMTL was down 1.78% before publication, while the announcement reported positive Tempiute drilling results and a decision to rehabilitate historical workings; no peer momentum or related same-day peer headlines were provided.

Key Figures

Phase I drillholes: 41 diamond drillholes Phase II drilling progress: 28 of 46 holes completed Longest Phase II intersection: 92.0m @ 0.34% WO3 +3 more

Phase I drillholes

41 diamond drillholes

Completed regional exploration program

Phase II drilling progress

28 of 46 holes completed

Ongoing resource drilling campaign

Longest Phase II intersection

92.0m @ 0.34% WO3

TP26-046 at Schofield

Phase II assays pending

24 drillholes

Additional holes awaiting assay results

Phase I mineralized holes

20 of 41 drillholes

Regional exploration program intersected tungsten mineralization

Underground rehabilitation

October 2026

Expected start of historical workings rehabilitation

Key Terms

mineral resource estimate, qualified person, s-k 1300

3 terms

mineral resource estimate technical

"support the potential definition of an initial Mineral Resource estimate"

A mineral resource estimate is a calculated approximation of how much metal or mineral material likely exists in a particular deposit and where it sits underground, similar to estimating how many cookies are in a jar by peeking at the layers. It matters to investors because it provides a data-based starting point for judging a project's potential value, future production and risks, while not guaranteeing recoverable or profitable amounts.

qualified person regulatory

"as a "qualified person" as defined in Subpart 1300"

A qualified person is someone with specialized knowledge, experience, and training in a particular field, allowing them to accurately assess and verify information or work. Their expertise helps ensure that reports, evaluations, or decisions are trustworthy and meet required standards. For investors, a qualified person provides confidence that the information they rely on is credible and properly validated.

s-k 1300 regulatory

"Subpart 1300 of Regulation S-K of the U.S. Securities"

Regulation S-K Item 1300 is a U.S. securities disclosure rule that requires public companies to report how they manage cybersecurity risks and to promptly disclose material cyber incidents. Think of it as a requirement to tell investors both the company’s “cyber health” plan and any major break-ins, similar to a homeowner explaining their alarm system and alerting neighbors after a burglary. This helps investors assess operational risk and potential financial or reputational impact.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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LONDON, UK / ACCESS Newswire / September 21, 2026 / Guardian Metal Resources plc (NYSE.A:GMTL)(LON:GMET)(OTCQB:GMTLF), a strategic exploration and development company focused on tungsten in Nevada, USA, is pleased to provide an update from its Tempiute tungsten project ("Tempiute" or the "Project"). This update covers results from the Company's now completed Phase I regional exploration drilling, in addition to the initial results from the ongoing Phase II drilling campaign, which is focused on the historically producing South Thumb and Schofield Zones.

The Phase I exploration drilling program comprised 41 diamond drillholes across regional target zones and confirmed that multiple tungsten-rich zones exist beyond the historical mine footprint. Notably, many of these targets warrant follow-up drilling and are detailed further below.

The ongoing Phase II resource drilling program is planned to include approximately 46 diamond drillholes, of which 28 have been completed to date. The program is designed to test the continuity, thickness and grade of mineralization around and beyond the historical underground workings, and to generate the data needed to support the potential definition of an initial Mineral Resource estimate at Tempiute.

On the strength of the results for the first four Phase II holes reported herein, together with visual observations from a further 24 drillholes awaiting assay, the Company has decided to commence a rehabilitation program to safely access the underground historical workings. This will allow underground drill rigs to be mobilized, providing improved access to further delineate Phase II target areas and prepare the Project for the stages that follow including, subject to further drilling and evaluation, mine development and operations.

Oliver Friesen, CEO of Guardian Metal, commented:

"These exciting drilling results represent an important step forward for Tempiute. We are seeing broad and high-grade tungsten mineralization around a mine that historically produced tungsten for many years. In addition, the regional drilling campaign has successfully proved that the mineralized system at Tempiute extends well beyond the historical workings.

"The 92.0 meter intersection at 0.34% WO₃ is particularly encouraging and reinforces our confidence in advancing the South Thumb and Schofield areas toward a planned initial Mineral Resource estimate.

"The results have also prompted a decision to begin rehabilitation of historical underground workings, which will give us more efficient access to the targets we most want to drill as well better positioning the Project for its expected next steps.

"Our objective is clear: demonstrate the scale of the mineralizing system at Tempiute, define an initial Mineral Resource estimate and evaluate the fastest responsible pathway to bringing Tempiute back into the U.S. tungsten supply chain."

PHASE II DRILLING HIGHLIGHTS: BROAD TUNGSTEN MINERALIZATION SUPPORTS ACCELERATED UNDERGROUND REHABILITATION DECISION

• The planned 46-hole Phase II campaign is well progressed, with 28 holes completed to date (drilling ongoing with two surface drill rigs). Assay results from the first four holes, reported in this announcement, demonstrate strong tungsten grades over favorable widths, with assays pending for a further 24 holes. Notable downhole intersections (see Table 1) include:

• TP26-046: 27.9m @ 0.27% WO₃ from 68.6m, including
  - 10.5m @ 0.36% WO₃ from 70.1m,
  - 5.9m @ 0.31% WO₃ from 85.9m, and,
  92.0m @ 0.34% WO₃ from 102.5m, including
  - 12.7m @ 0.53% WO₃ from 170.5m,
  - 5.1m @ 0.49% WO₃ from 188.4m.
• TP26-042: 20.2m @ 0.21% WO₃ from 210.0m, including
  - 6.9m @ 0.35% WO₃ from 211.9m.

• TP26-044: 23.9m @ 0.22% WO₃ from 175.1m (see Table 1 notes)

• TP26-045: 5.2m @ 0.28% WO₃ from 253.4m

• The South Thumb and Schofield Zones are centered on the historical underground production workings last operated by Union Carbide Corporation ("UCC") before the Tempiute Mine closed in the 1980s. These zones are the principal focus of the Phase II drilling campaign, which has been designed to generate sufficient data to support the planned definition of a Mineral Resource estimate.

• In parallel with the ongoing surface drilling, the Company has engaged an underground mining contractor to rehabilitate strategically located historical workings and drill stations, with works expected to start in October 2026.

• Once rehabilitation is complete, underground drill rigs will be mobilized to support improved drilling access to the South Thumb and Schofield zones. The underground adit accesses are approximately 200 meters from these zones of historical production and are generally in fair to good condition.

• In parallel, Guardian is assessing the permitting requirements for mining a near-surface mineralized lode located on patented mining claims, with a view to identifying the shortest path to extracting new tungsten feed material from Tempiute.

PHASE I DRILLING HIGHLIGHTS: RESULTS HIGHLIGHT BROADER TEMPIUTE DISTRICT POTENTIAL

• A total of 20 diamond drillholes from the 41-hole Phase I regional exploration program intersected strong tungsten mineralization representing an encouraging hit rate for a regional exploration drilling campaign.

• The Phase I results demonstrate that tungsten-skarn mineralization is well defined across multiple areas outside the historically mined zones at Tempiute, pointing to a more extensive and robust mineralizing system associated with the two main causative intrusive bodies. Multiple targets require further follow-up.

• Regional exploration drillhole results (see Table 2) include downhole intersections of:*

• TP25-021: 32.4m @ 0.26% WO₃ from 293.7m including
  - 1.7m @ 2.00% WO₃ from 306.9m
• TP25-028: 18.5m @ 0.18% WO₃ from 24.5m including
  - 4.0m @ 0.32% WO₃ from 27.1m and
  - 3.4m @ 0.38% WO₃ from 39.6m
• TP26-031: 14.0m @ 0.35% WO₃ from 59.5m including
  - 5.8m @ 0.63% WO₃ from 67.7m
• TP25-015: 11.2m @ 0.17% WO₃ from 94.5m including
  - 2.3m @ 0.64% WO₃ from 98.6m

• TP25-014A: 10.2m @ 0.13% WO₃ from 132.3m

• TP25-020A: 8.8m @ 0.35% WO₃ from 183.6m

*Cut-off for the purposes of the regional exploration results (Phase I) was set at >2m @ 0.10% WO₃

Note: True thicknesses of all intercepts reported herein are not yet known.

Figure 1: Project geology along with location of Phase I and Phase II drillholes.

Figure 2: Location of the Phase II drill holes together with the planned drill hole traces within the South Thumb and Schofield target zones.

​

Figure 3: Orthogonal three-dimensional model of the planned resource targets at the Schofield and South Thumb zones displaying completed and planned drillholes and the existing underground mine network.

ASSAY RESULTS

Analytical results from the Phase I regional exploration drilling and ongoing Phase II Mineral Resource campaign are summarized below.

Drillhole ID	From (m)	To (m)	Length (m)	WO3 (%)	Zn (%)	Ag (ppm)	Cu (%)
TP26-042	210.00	230.20	20.20	0.21	0.22	2.03	0.010
incl.	211.91	218.85	6.94	0.35	0.55	3.98	0.007
TP26-044	175.14	199.00	23.86 *	0.22	0.09	0.82	0.005
incl.	175.14	189.89	13.18	0.29	0.14	1.25	0.004
TP26-045	253.43	258.59	5.16	0.28	0.08	2.75	0.025
TP26-046	68.60	96.46	27.86	0.27	0.28	0.84	0.028
incl.	70.10	80.55	10.45	0.36	0.13	1.42	0.028
incl.	85.94	91.80	5.86	0.31	0.54	0.47	0.040
and	102.50	194.45	91.95	0.34	0.79	4.13	0.049
incl.	111.60	128.00	16.40	0.33	0.34	1.11	0.054
incl.	170.50	183.20	12.70	0.53	0.11	0.61	0.013
incl.	188.36	193.50	5.14	0.49	0.19	18.83	0.060
Notes: Only material intercepts of at least 5m apparent width at a cut-off grade of >/=0.04% WO3 are included. Weighted composite grades based on MSA Labs certified assay results from analytical method codes IMS-300 / IMS-230; IMS-300; IMS-230; WO3-WRX4W; and Zn-ICF6Zn. Depths and grades are subject to rounding. * Interval includes 1.57m not sampled. Downhole depth interval of intersection = 23.86m, intersection width assayed = 22.29m. Weighted average of assays = 22.29m @ 0.24% WO3.. Taking 1.57m unsampled section as nil grade dilution, weighted average grade of total downhole intersection = 23.86m @ 0.22% WO3

Table 1: Phase II - Mineral Resource Drilling Significant Downhole Intersections

Drillhole ID	From (m)	To (m)	Length (m)	WO3 (%)	Zn (%)	Ag (ppm)	Cu (%)
TP25-001	91.00	93.77	2.77	0.32	0.31	2.30	0.02
TP25-003	28.85	32.42	3.57	0.15	0.25	0.86	0.00
and	99.92	102.65	2.73	0.26	0.09	0.82	0.00
TP25-004	122.47	125.40	2.93	0.12	0.05	0.25	0.00
and	130.40	133.67	3.27	0.17	0.46	20.38	0.00
and	144.21	148.52	4.31	0.71	0.37	28.40	0.02
TP25-007	23.20	25.60	2.40	0.27	0.06	3.16	0.00
TP25-010	28.10	31.20	3.10	0.10	0.04	0.03	0.00
TP25-012	107.46	111.20	3.74	0.22	0.21	5.12	0.18
TP25-013	69.19	71.59	2.40	0.22	0.11	0.50	0.00
and	169.86	172.23	2.37	0.26	0.58	3.91	0.01
TP25-014A	96.86	102.72	5.86	0.12	0.04	0.50	0.00
and	132.30	142.47	10.17	0.13	0.14	3.68	0.00
TP25-015	94.51	105.70	11.19	0.17	0.13	0.81	0.00
incl.	98.60	100.85	2.25	0.64	0.50	1.00	0.00
and	132.73	135.03	2.30	0.14	0.26	0.50	0.00
and	172.37	174.82	2.45	0.21	0.02	0.77	0.00
TP25-017	-	8.23	8.23	0.12	0.14	4.15	0.02
and	63.25	66.14	2.89	0.14	0.09	1.00	0.00
TP25-019	59.00	61.24	2.24	0.10	0.16	0.73	0.00
and	88.72	91.36	2.64	0.16	0.10	1.00	0.00
and	196.60	200.92	4.32	0.43	0.31	1.13	0.00
TP25-020A	183.64	192.43	8.79	0.35	0.37	118.28	0.04
incl.	186.64	188.77	2.13	0.39	0.07	0.25	0.00
TP25-021	293.72	326.14	32.42	0.26	0.27	0.33	0.00
incl.	306.93	308.63	1.70	2.00	0.50	1.70	0.00
TP25-026	0.61	4.27	3.66	0.41	0.14	0.99	0.04
TP25-027	28.32	32.00	3.68	0.23	0.52	1.53	0.01
and	36.73	41.76	5.03	0.48	0.06	4.66	0.26
and	42.37	43.95	1.58	0.47	0.10	2.18	0.09
TP25-028	24.54	43.00	18.46	0.18	0.06	1.67	0.12
incl.	27.13	31.16	4.03	0.32	0.06	0.89	0.07
plus	39.60	43.00	3.40	0.38	0.03	1.08	0.09
TP26-030	40.08	46.79	6.71	0.22	0.07	1.98	0.13
TP26-031	59.45	73.46	14.01	0.35	0.50	4.72	0.06
incl.	67.69	73.46	5.77	0.63	0.46	8.07	0.09
TP26-039	297.83	301.40	3.57	0.84	3.88	0.25	0.01
TP26-041	3.00	6.00	3.00	0.13	0.06	1.18	0.03
Notes: Only material intercepts of at least 2m apparent width at a cut-off grade of >/=0.1% WO3 are included. Weighted composite grades based on MSA Laboratory certified assay results from analytical method codes IMS-300 / IMS-230; WO3-WRX4W; and Zn-ICF6Zn. In addition to ALS Laboratories certified assay results from analytical method codes ME-ICP61, ME-MS81, ME-4ACD81, W-XRF-15c and AG-OG46. Depths and grades are subject to rounding. The following holes intersected low-grade WO3 and/or intercepts of WO3 <2m: TP25-002, TP25-005, TP25-006, TP25-008, TP25-011, TP25-016, TP25-018, TP25-020, TP25-023, TP25-025A, TP26-032, TP26-034, TP26-035 and TP26-036. Hole TP26-037 was not sampled due to no visual tungsten mineralization being intersected. Holes TP25-009, TP25-029, , TP26-038 and TP26-040 are currently being analyzed at MSA Laboratories.

Table 2: Phase I - Regional Exploration Drilling Significant Downhole Intersections

Hole ID	Zone	UTM Easting	UTM Northing	Azimuth	Dip	Hole Depth (m)
TP26-042	South Thumb	620965	4165692	000	-45	245.67
TP26-044	South Thumb	620968	4165692	035	-47	213.06
TP26-045	South Thumb	620964	4165689	350	-55	267.31
TP26-046	Schofield	621225	4165537	260	-50	205.27
Notes: NAD83/ UTM Zone 11N Datum. All holes are diamond drilling HQ core diameter.

Table 3: Phase II - Collar Locations

Hole ID	Zone	UTM Easting	UTM Northing	Azimuth	Dip	Hole Depth (m)
TP25-001	Dead-Eye	620632	4167854	064	-45	105.77
TP25-003	Dead-Eye	620818	4167416	079	-45	148.49
TP25-004	Dead-Eye	620817	4167415	082	-72	178.31
TP25-007	Dead-Eye	620693	4167613	082	-45	86.56
TP25-010	Dead-Eye	620685	4167733	065	-76	132.44
TP25-012	Dead-Eye	620783	4167449	070	-45	129.24
TP25-013	Dead-Eye	620782	4167448	069	-70	185.01
TP25-014A	Dead-Eye	620850	4167370	091	-45	152.7
TP25-015	Dead-Eye	620848	4167370	091	-73	199.34
TP25-017	Dead-Eye	620829	4167325	092	-69	413.61
TP25-019	Dead-Eye	620838	4167268	109	-69	285.6
TP25-020A	Headframe Deeps	620732	4167022	138	-85	212.45
TP25-021	Headframe Deeps	620728	4167025	338	-81	340.46
TP25-026	Lime Cap	621283	4166003	252	-45	91.9
TP25-027	Lime Cap	621218	4165798	302	-45	64.77
TP25-028	Lime Cap	621218	4165797	323	-87	55.93
TP26-030	Lime Cap	621224	4165791	242	-45	78.03
TP26-031	Lime Cap	621322	4165865	285	-45	85.34
TP26-039	Headframe Deeps	620779	4167095	000	-90	333.3
TP26-041	Stockpile	620652	4166698	000	-90	17.07
Notes: NAD83/ UTM Zone 11N Datum. All holes are diamond drilling HQ core diameter.

Table 4: Phase I - Collar Locations

Next Project Steps

Phase II drilling continues across the South Thumb and Schofield zones, with 28 of the planned 46 holes already completed and assays from a substantial number of holes still pending. The program is designed to provide the geological and analytical information required to support an initial Mineral Resource estimate.

In parallel, underground mine rehabilitation is expected to commence in October 2026. Re-establishing access to the historical mine which will enable shorter and more targeted underground drilling and represents an important step toward rebuilding operational access to the Tempiute mineralized system.

Guardian is also evaluating opportunities to accelerate the pathway toward extracting newly mined tungsten material from Tempiute. This work includes assessing access to the near-surface mineralized lode located on patented mining claims, and the permitting requirements for mining it, with a goal of returning Tempiute to an active role in the U.S. tungsten supply chain.

Note: Tempiute is an exploration-stage property, and no Mineral Resource or Mineral Reserve has been estimated for the Project. The exploration results reported in this announcement are not sufficient to support such an estimate, and there can be no assurance that an initial Mineral Resource estimate will be defined at Tempiute. Any extraction of material from Tempiute on an accelerated basis may not be supported by a Mineral Reserve estimate or a feasibility study demonstrating economic viability, and would be subject to significant technical, permitting, financing and other risks, including those described in the Company's filings with the U.S. Securities and Exchange Commission.

Quality Control and Assurance

All samples were submitted to MSA Labs (MSA) of Elko, Nevada which is an ISO9001 and ISO/IEC 17025 accredited laboratory. Samples were analyzed using method IMS-300 and IMS-230. Guardian Metal's QA/QC program includes regular insertion of standards, duplicates and blanks into the sample stream with stringent review of all results.

Samples from Phase 1 were submitted to ALS Laboratories of Reno, Nevada. Samples were analyzed using methods ME-ICP61, W-XRF-15c and AG-OG46. Guardian Metal's QA/QC program includes regular insertion of standards, duplicates and blanks into the sample stream with stringent review of all results.

COMPETENT AND QUALIFIED PERSON STATEMENT

The technical information contained in this disclosure has been read and approved by Mr Nicholas O'Reilly (MSc, DIC, MIMMM QMR, MAusIMM, FGS), who is a qualified geologist and acts as the Competent Person under the AIM Rules - Note for Mining and Oil & Gas Companies and as a "qualified person" as defined in Subpart 1300 of Regulation S-K of the U.S. Securities and Exchange Commission ("S-K 1300"). Mr O'Reilly is a Principal consultant working for Mining Analyst Consulting Ltd which has been retained by Guardian Metal Resources plc to provide technical support.

This announcement contains inside information for the purposes of Article 7 of EU Regulation 596/2014 (which forms part of domestic UK law pursuant to the European Union (Withdrawal) Act 2018).

Forward Looking Statements

This announcement contains forward-looking statements relating to expected or anticipated future events and anticipated results that are forward-looking in nature and, as a result, are subject to certain risks and uncertainties, including general economic, market and business conditions, competition for qualified staff, the regulatory process and actions, technical issues, new legislation, potential delays or changes in plans, uncertainties resulting from operating in a new political jurisdiction, uncertainties regarding the results of exploration, the timing and granting of prospecting rights, the timing and granting of regulatory and other third party consents and approvals, Guardian Metal's or any third party's ability to execute and implement future plans, and the occurrence of unexpected events.

Forward-looking statements in this announcement include statements regarding the Tempiute drilling program, the timing and content of further assay results, the potential definition of a Mineral Resource estimate at Tempiute, the planned rehabilitation of historical underground workings and its expected timing, the potential for an accelerated pathway to extracting material at Tempiute, and the Company's plans to advance Pilot Mountain and Tempiute towards production. Forward-looking statements are subject to risks and uncertainties, including those described in the Company's filings with the U.S. Securities and Exchange Commission. Guardian Metal undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required by law.

This announcement does not purport to be full or complete. No reliance may or should be placed by any person for any purpose on the information contained in this announcement or its accuracy, fairness or completeness. The information in this announcement is subject to change.

For further information visit www.Guardianmetalresources.com or contact the following:

Guardian Metal Resources plc Oliver Friesen (CEO)	Tel: +44 (0) 20 7583 8304
Cairn Financial Advisers LLP Nominated Adviser Sandy Jamieson/Jo Turner/Louise O'Driscoll	Tel: +44 (0) 20 7213 0880
Berenberg Joint Broker and Financial Adviser Jennifer Lee/Ivan Briechle	Tel: +44 (0) 20 3207 7800
Tamesis Partners LLP Joint Broker Charlie Bendon/Richard Greenfield	Tel: +44 (0) 20 3882 2868
Tavistock Financial PR in the UK Emily Moss/Eliza Logan	Tel: +44 (0) 7920 3150 / +44 (0) 7788 554035 guardianmetal@tavistock.co.uk
Edelman Smithfield Financial PR in the US	guardianmetal@edelmansmithfield.com

About Guardian Metal Resources

Guardian Metal Resources PLC (NYSE.A:GMTL)(LON:GMET0(OTCQB:GMTLF) is a strategic mineral exploration company driving the revival of U.S. mined tungsten production and strengthening America's defense metal independence. The Company is advancing two tungsten projects, Pilot Mountain, one of the largest undeveloped tungsten deposits in the U.S. and Tempiute, formerly America's largest producing tungsten operation, both located in Nevada, one of the top-rated mining jurisdictions in the United States.

In July 2025, the U.S. Department of War (DoW) under Title III of the Defense Production Act of 1950, as amended, invested US$6.2M in Golden Metal Resources (USA) LLC, a wholly-owned subsidiary of Guardian Metal Resources PLC, to support the Pilot Mountain PFS.² The Company completed a U.S. listing on the NYSE American on March 20, 2026.

Tungsten is a strategic metal critical to the defense, energy transition, technology and industrial sectors. In the context of shifting geopolitical dynamics and tightening Chinese export restrictions, Guardian Metal is well positioned to play a leading role in re-establishing a secure, domestically mined U.S. supply chain for this vital defense metal.

This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.

SOURCE: Guardian Metal Resources PLC

View the original press release on ACCESS Newswire

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What is the objective of the Phase II drilling program at Tempiute?

The Phase II program, planned for about 46 diamond drillholes focused on the South Thumb and Schofield zones, is designed to test continuity, thickness and grade of tungsten mineralization around and beyond historical underground workings and to generate the geological and analytical data needed to support a planned initial Mineral Resource estimate.

When will underground rehabilitation start and what will it enable?

Underground mine rehabilitation, using an engaged mining contractor, is expected to commence in October 2026. Once complete, underground drill rigs will be mobilized, enabling shorter, more targeted drilling from underground stations near the South Thumb and Schofield zones and rebuilding operational access to the Tempiute mineralized system.

How is Guardian Metal evaluating early tungsten production opportunities at Tempiute?

The company is assessing access and permitting requirements for mining a near‑surface mineralized lode located on patented mining claims, with the goal of identifying the shortest path to extracting new tungsten feed material and returning Tempiute to an active role in the U.S. tungsten supply chain.

What cut-off grades were used to report the Phase I and Phase II drill intercepts?

For Phase I regional exploration, only intercepts of at least 2m apparent width with grades of at least 0.10% WO₃ were reported. For Phase II Mineral Resource drilling, only intercepts of at least 5m apparent width with grades of at least 0.04% WO₃ WO₃ were included in the significant downhole intersections.

Which laboratories analyzed the drill samples and how was QA/QC handled?

Samples were primarily analyzed by MSA Labs in Elko, Nevada, an ISO9001 and ISO/IEC 17025 accredited laboratory, using methods including IMS-300, IMS-230, WO₃-WRX4W and Zn-ICF6Zn, with additional Phase I samples analyzed by ALS Laboratories. Guardian Metal’s QA/QC program includes regular insertion of standards, duplicates and blanks into the sample stream and stringent review of all results.