REG - Guardian Metal Rsrc. - Tempiute Mine Project - Geological Update

Guardian Metal ResourcesAnnouncement

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RNS Number : 7269G  Guardian Metal Resources PLC  30 April 2025

30 April 2025

Guardian Metal Resources plc

('Guardian Metal' or the 'Company')

Tempiute Mine Project - Geological Update

Extensive Skarn & Porphyry Mineralisation Identified, Project Footprint
Doubled by Staking

Guardian Metal Resources plc (LON:GMET, OTCQX:GMTLF), a strategic development
and mineral exploration company focused in Nevada, USA, is pleased to announce
that an independent porphyry-system expert, Dr. Lawrence Carter, has completed
a positive site assessment of the recently acquired Tempiute Tungsten Project
("Tempiute" or the "Project"). Tempiute, formerly known as the Emerson
Tungsten Mine, is located in south-central Nevada less than 250 miles (402 km)
southeast of the Company's Pilot Mountain tungsten project.

On 27 January 2025, the Company announced the signing of an option agreement
to acquire 100% of Tempiute. For the details and commercial terms see the
following link:

https://www.londonstockexchange.com/news-article/GMET/option-to-acquire-tempiute-tungsten-project-signed/16869717
(https://www.londonstockexchange.com/news-article/GMET/option-to-acquire-tempiute-tungsten-project-signed/16869717)

BACKGROUND

Guardian Metal recently retained Dr Lawrence Carter, an independent
porphyry-system expert, to conduct a geological field review of the Tempiute
mine and surrounding area (Figure 1). Dr Carter was engaged to investigate and
confirm historical geological reports of the Tempiute mine whilst also
prospecting the surrounding area for further exploration potential. A
high-level summary of his findings are provided herein.

HIGHLIGHTS

§ Extensive zones of outcropping tungsten-rich skarn mineralisation
(confirmed via ultraviolet light fluorescence investigations) mapped across
the entire Project area which have a direct association to two quartz
monzonite stocks (causative porphyry intrusions).

 

§ Multiple new zones of tungsten-rich skarn mineralisation (garnet rich) were
identified at the margins of the north quartz monzonite stock, which appear to
have been little-explored. The Company has immediately staked a total of 29
new Bureau of Land Management ("BLM") Lode Mining Claims at Tempiute to cover
these new target areas, significantly increasing the mineralised footprint of
the Project by more than double. Maps will be made available once analytical
results have been received.

 

§ Multiple zones of porphyry-style stockwork veining in altered quartz
monzonite are outcropping within the southern quartz monzonite stock. Locally
these zones include hypogene molybdenite mineralisation as well as secondary
copper mineralisation (copper oxide and chalcocite). Seemingly overlooked by
previous work, the Company has now completed claim staking to cover areas
prospective for larger-scale porphyry-style mineralisation.

 

§ Numerous "truck-ready" historical ore stockpiles identified across the
Project, of both skarn and massive sulphide mineralisation, including a
further stockpile that was identified east of the Project area that is now
covered by staking. Several samples of this material are undergoing laboratory
analysis.

 

§ A new tungsten-skarn system identified and two new BLM Lode Mining Claims
staked at a newly identified satellite zone to Tempiute to be named the
Worthington system, generated by the Company's regional exploration campaign.
Further details in relation to Worthington will be released to the market in
due course.

 

TUNGSTEN SKARN MINERALISATION AT TEMPIUTE AND HISTORICAL MINING

Polymetallic tungsten-rich skarn mineralisation occurs in a thermally zoned,
contact-metasomatic garnet-pyroxene skarn zone, separating the causative
Cretaceous-aged quartz monzonite and barren limestone and hornfels. Historical
mining at the Tempiute Mine (also known as the Emerson Mine) targeted the
widest zones of skarn mineralisation using underground stoping. Some stopes
can be viewed via glory holes at surface (Figure 1D). Previous work delineated
skarn zones up to 30 m thick to be uniformly mineralised over vertical ranges
of at least 400 m based on historical mine plans. Reported principal ore
minerals include scheelite, sphalerite, molybdenite, chalcopyrite and
galena(1). Despite the historical mining activity, many zones of skarn
mineralisation remain outcropping at surface, ranging from < 1 m to circa
20 m thick in outcrop, all along contact zones with the two quartz monzonite
stocks.

The skarn is varied, with notable styles including banded garnet-pyroxene
skarn and coarse garnet skarn, with garnets up to 1 cm in size (Figure 2). By
investigation under ultraviolet ("UV") light fluorescence, scheelite and/or
powellite appears more abundant in garnet rich zones and sulphides in diopside
bands. Certain skarn zones are sulphide rich, with pods of sulphide minerals
(predominately pyrite) up to 5 cm across (see Figure 2D). Molybdenite is
locally abundant and very coarse grained, particularly near the contact
between the skarn and unmineralised hornfels (Figure 3). The garnet skarn is
also cut by sulphide mineralised quartz veins (see Figure 2E). Grab samples
were taken at all skarn outcrops across the project to investigate the
strength and variations in mineralisation.

NEW SKARN ZONES MAPPED AND STAKED AT TEMPIUTE

Dr Carter identified several new zones of outcropping garnet skarn
mineralisation around the south, east and north margins of the north quartz
monzonite stock (Figure 9 & 10). In outcrop, these skarn zones vary from
approximately 1m to 10m in thickness. UV light investigation shows that these
outcropping garnet skarns are tungsten rich (Figure 10). Numerous grab samples
were taken from these zones to investigate the strength and variety of
mineralisation.  Some of these skarns have been historically mined on a small
scale, and others are outcropping with no evidence of previous mining. No
evidence for historical drill holes was found, and so it is assumed that these
skarn zones are little- to un-explored.

Based on Dr Carter's findings, the Company immediately staked a total of 29
new BLM Lode Mining Claims ("claims") at Tempiute to cover the newly
identified skarn zones and the areas believed to be highly prospective for
porphyry-style mineralisation (see below), increasing the overall footprint of
the Tempiute project area.

 

PORPHYRY-STYLE ALTERATION AND MINERALISATION

The polymetallic skarn mineralisation is associated with two quartz monzonite
intrusions, which are both cut by porphyry dykes of similar composition. The
north intrusion is coarser grained and more homogenous than the south
intrusion, and is notable for zones of potassic alteration associated with
quartz veins (pyrite bearing locally) (Figure 4). With the southern intrusion,
proximal to the skarn zones, are multiple outcrops of quartz-sericite-pyrite
("QSP" or "phyllic") alteration associated with intense stockworks of oxidised
quartz-sulphide veins (Figure 5). These stockworks are locally associated with
secondary copper mineralisation (copper oxide and chalcocite) and, where less
oxidised, some of the outcropping veins are molybdenite-pyrite-quartz veins
(Figure 6). Small areas of gossan and massive sulphide mineralisation (Figure
7) also appear associated with the zones of stockwork veins. These outcropping
mineralised stockworks are considered exciting as they highlight the potential
for larger scale porphyry-style mineralisation. These zones also appear to
have been overlooked by the historical work which has focused purely on the
high grade skarn mineralisation and may have dismissed the potential for
high-tonnage porphyry-style mineralisation. All areas were sampled to
investigate the mineralisation. A proportion of the 29 new claims cover the
areas believed to be highly prospective for porphyry-style mineralisation.

 

NUMEROUS ORE STOCKPILES

Numerous historical ore stockpiles were identified around the Project and
extensively sampled (Figure 8). As the mine abruptly ceased operations in the
1980s due to flooding of the tungsten market, and the subsequently decrease in
metal pricing, the operator at the time left ore stockpiled by the mill site
and around the numerous mine portals. The majority of the stockpiles are
easily accessible by the existing roads and therefore deemed "truck-ready" for
transport to a processing facility. The majority of the stockpiles comprise
banded red-green garnet skarn and coarse garnet skarn. At least one stockpile
is of massive sulphide and gossanous material. The Company is exploring its
potential options to process this material in the shortest timeframe possible,
given that it would represent the only domestic primary source of tungsten in
the USA.

 

SAMPLES FOR MOLYBDENITE RE-OS AGE DATING

Three samples of molybdenite, one from a porphyry-style
molybdenite-pyrite-quartz vein within the south quartz monzonite and two from
coarse molybdenite skarn zones, have been sent for molybdenite rhenium-osmium
geochronological analysis (Re-Os dating) by Prof. David Selby at the
University of Durham, UK. The data will allow the Company's geologists to
better place the Tempiute geology into a regional setting, and further assist
the Company's broader exploration campaign.

 

WORTHINGTON - NEW SATELLITE PROJECT STAKED

The Company's regional exploration programme generated a number of tungsten
skarn targets to be potential satellite projects to Tempiute. Dr Carter
assessed a number of these targets during his field campaign. As a result, the
Company immediately staked two claims over the Worthington skarn system.

The Worthington skarn system is situated approximately 34 km north of the main
Tempiute project area, in the Worthington Mountains. Similar to Tempiute,
scheelite bearing garnet skarn is developed at the contact between a
Cretaceous granitic stock and limestones. The skarn is outcropping and can be
traced for several hundred metres along a ridge. From inspection with UV
light, scheelite and/or powellite appears disseminated throughout a light
green garnet-pyroxene skarn (Figure 11). Along with descriptions of scheelite
and wolframite, historical literature(2) estimated the skarn to contain circa
0.4% WO(3). The area seems completely unexplored beyond one very short adit
and shaft. Further updates will be provided once assays are returned from the
eight grab samples taken along the ridge of outcropping skarn.

 

MEDIA

Figure 1: (A) looking east at the Tempiute Range. White arrow showing location
of millsite (B),  looking west above the millsite, white arrow to correlate
location with A & C. (C) view from mine site looking north towards the
mill site (white arrow). The skarn zone continues along the ridge at the
contact between the quartz monzonite and host limestone. (D) glory hole where
an open stope has reached surface. See ladder in stope for scale. The skarn
zone can be seen in cross section here as circa 20-30 m thick.

Figure 2: (A) looking north at outcropping circa 20 m thick skarn zone at the
contact between intensely QSP altered quartz monzonite (right) and limestone
(far left). This outcrop is above a glory hole into an open stope, the same
seen in Figure 1 D. (B) example of outcropping banded garnet (red) and
pyroxene (green) skarn. (C) sample of coarse garnet skarn, with garnets up to
1 cm in diameter. (D) pods of massive sulphide in garnet skarn. (E) banded
skarn cut by chalcopyrite-pyrite mineralised quartz vein. (F) fluorescence
under UV light of garnet skarn showing high concentration of powellite and/or
scheelite. Gn = garnet, Py = pyrite, Cpy – chalcopyrite, Qtz = quartz, Px =
pyroxene.

Figure 3: Examples of coarse grained molybdenite mineralisation in garnet
skarn, found associated with calcite veins at and near the contact between the
skarn with unmineralised hornfels.

Figure 4: Quartz veins with potassic alteration halos (pink) outcropping in
the north quartz monzonite stock.

Figure 5: Examples of intense porphyry-style stockworks of quartz-sulphide
veins in QSP altered quartz monzonite, from various outcrops across the south
quartz monzonite stock. The stockworks are seen locally associated with
secondary Cu mineralisation (Cu oxides and chalcocite).

Figure 6: Examples of outcropping molybdenite-pyrite-quartz veins in the QSP
altered southern quartz monzonite stock, demonstrating hypogene porphyry-style
mineralisation. Mo = molybdenite, Py = pyrite, Qtz = quartz.

Figure 7: Sample of gossanous, massive sulphide mineralisation adjacent to
outcropping stockwork quartz-sulphide veins in QSP altered quartz monzonite.

Figure 8: Examples of the numerous “truck-ready” stockpiles of garnet
skarn and gossan / massive sulphide.

Figure 9: Field photographs of the newly identified and immediately staked
garnet skarn zones around the margins of the north quartz monzonite stock.
Some have been historically mined on a small scale whilst others appear
untouched. No evidence of historical drilling was found and these are assumed
to be effectively unexplored.

Figure 10: Outcrop to sample scale examples of a newly identified and
immediately staked skarn zone, with a photograph of fluorescence under UV
light showing the high concentrations of scheelite and/or powellite.

Figure 11: (A) outcropping pale green skarn at Worthington, a newly identified
and claimed satellite project to Tempiute. The skarn is developed at the
contact between a granite stock and limestones. (B) remnants of a historical
shaft, the only evidence of historical activity at the prospect. (C to E)
examples of outcropping garnet-pyroxene skarn at the Worthington system. (F)
fluorescence of sample (shown in E) under UV light, indicating high
concentrations of powellite and/or scheelite.

COMPETENT PERSON STATEMENT

The technical information contained in this disclosure has been read and
approved by Mr Nick 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. 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.

REFERENCES

(1) Busek, P., 1967. Contact Metasomatism and Ore Deposition: Tempiute,
Nevada. Economic Geology, 62, pp. 331-353.

(2)Tschanz, C.M. and Pampeyan, E.H., 1970. Geology and Mineral Deposits of
Lincoln County, Nevada. Nevada Bureau of Mines and Geology, Bulletin 73.

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). The Directors of the Company are
responsible for the contents of this announcement.

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, such
as general economic, market and business conditions, competition for qualified
staff, the regulatory process and actions, technical issues, new legislation,
uncertainties resulting from potential delays or changes in plans,
uncertainties resulting from working in a new political jurisdiction,
uncertainties regarding the results of exploration, uncertainties regarding
the timing and granting of prospecting rights, uncertainties regarding the
timing and granting of regulatory and other third party consents and
approvals, uncertainties regarding the Company's or any third party's ability
to execute and implement future plans, and the occurrence of unexpected
events.

Actual results achieved may vary from the information provided herein as a
result of numerous known and unknown risks and uncertainties and other
factors.

For further information visit www.Guardianmetalresources.com
(http://www.goldenmetalresources.com) or contact the following:

 Guardian Metal Resources plc                 Tel: +44 (0) 20 7583 8304

 Oliver Friesen (CEO)
 Cairn Financial Advisers LLP                 Tel: +44 20 7213 0880

 Nominated Adviser

 Sandy Jamieson/Jo Turner/Louise O'Driscoll
 Shard Capital Partners LLP                   Tel: +44 (0) 20 7186 9000

 Lead Broker

 Damon Heath/Erik Woolgar

 

 

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