REG - Great Southrn.Copper - Ground Magnetics Survey Commences at Viuda

Great Southern CopperAnnouncement

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RNS Number : 0996M  Great Southern Copper PLC  18 December 2025

 

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS STIPULATED UNDER THE UK
VERSION OF THE MARKET ABUSE REGULATION NO 596/2014 WHICH IS PART OF ENGLISH
LAW BY VIRTUE OF THE EUROPEAN (WITHDRAWAL) ACT 2018, AS AMENDED.  ON
PUBLICATION OF THIS ANNOUNCEMENT VIA A REGULATORY INFORMATION SERVICE, THIS
INFORMATION IS CONSIDERED TO BE IN THE PUBLIC DOMAIN.

 

 

18 December 2025

 

Great Southern Copper plc

("GSC" or the "Company")

 

Ground Magnetics Survey Commences at Viuda Gold Prospect

 

Targeting Maricunga-style porphyry Au-Cu deposits

 

Great Southern Copper plc (LSE: GSCU), the company focused on
copper-gold-silver exploration in Chile, is pleased to announce that it has
commenced a ground magnetic survey at its Viuda porphyry Au-Cu prospect
("Viuda") at the Company's Especularita project.

 

Highlights:

·      Ground magnetics commences with a 250 line-kilometre survey at
Viuda

·      Exploration targeting large-scale Maricunga porphyry Au-Cu type
deposits

·      Previous scout drilling intersected broad zones of gold
mineralisation, including(1);

o  DD004: 6.7m @ 0.39 g/t Au & 0.12% Cu from 43.1m, within broader
interval of:

§ 121.5m @ 0.11 g/t Au & 0.05% Cu from 6.5m, and

o  DD002: 14.2m @ 0.21 g/t Au & 0.11% Cu from 11m, within broader
interval of:

§ 73m @ 0.14 g/t Au & 0.1% Cu from 11m

·      High gold grades hosted in stockwork veining within magnetic
porphyry intrusive

·      Phase II drilling at Viuda is anticipated in early 2026

·      GSC has option to earn 100% of the Viuda prospect

·      Viuda located at low elevation with excellent access to
infrastructure and mining services

 

Porphyry Au deposits in Chile:

Scout drilling by GSC at Viuda earlier this year confirmed that gold and
copper mineralisation is associated with stockwork and sheeted dark-banded and
A-type quartz veinlets within widespread intermediate-argillic and
magnetite-albite-chlorite altered diorite porphyry intrusives. The
mineralisation and alteration are typical of Maricunga-style gold porphyry
systems, such as Kinross Gold's Lobo-Marte deposit (6.7Moz Au at 1.3 g/t(2)),
Maricunga (4.3 Moz at 0.7 g/t(3)) and Rio2's Fenix deposit (1.77 Moz Au at
0.48 g/t Au(4)).

 

Sam Garrett, Chief Executive Officer of Great Southern Copper, said: "Previous
work by the company, including drilling, has established mineralisation and
alteration at Viuda that are consistent with a Maricunga-style porphyry gold
system, a style which has not previously been reported within the coastal
metallogenic belt of Chile. In particular, scout drilling has demonstrated
that higher grades of gold are associated with a magnetic porphyry intrusive.

 

"This ground magnetics survey is planned to identify potential magnetic
intrusives that will assist the company in vectoring its next phase of
drilling at Viuda, which is anticipated to commence within the first quarter
of 2026. I look forward to keeping shareholders and the wider market informed
as exploration at Viuda progresses and as results from the ground magnetic
survey are received and interpreted."

 

Viuda Prospect:

The Viuda and Viuda Negra prospects, located approximately 15km to the
southwest of the Company's Cerro Negro, comprises 18km(2) of concessions
centred upon a prominent hill of resistive silicified rock (Chingay Hill) and
surrounded by a 2km wide bowl-shaped depression ("bajo") of dominantly
albite-pyrite-clay altered volcanics and intrusive rocks - a geological
setting typical of many porphyry deposits, formed by supergene weathering and
oxidation.

 

Viuda Negra is located approximately 1km to the east of Chingay Hill, and
recent scout drilling intersected broad intervals of anomalous gold
including(1);

 

·    DD004: 6.7m @ 0.39 g/t Au & 0.12% Cu from 43.1m, within broader
interval of:

o  121.5m @ 0.11 g/t Au & 0.05% Cu from 6.5m

 

The discrete higher-grade interval in DD004 is associated with a porphyritic
microdiorite intrusive phase which is over-printed by abundant banded and
A-type quartz veinlets and intense, magnetite-rich potassic alteration. This
is interpreted as an early-mineral porphyry phase and suggests that
higher-grade centres may be present elsewhere within the system.

 

Ground magnetics survey:

The Viuda ground magnetics survey comprises a 250 line-kilometre survey with
east-west orientated grid-lines and a line spacing of 50m (Figure 1). The
survey is being completed by Santiago-based Southern Geophysics and covers the
full extent of the clay-altered "bajo" which defines the prospect.

 

The survey is designed to identify potassic-altered magnetic intrusive bodies
that are potentially indicative of porphyry Au-Cu mineralisation as identified
in hole DD004 of the scout drilling programme.

 

Figure 1: Oblique Google image of the Viuda and Viuda Negra prospect
illustrating grid lines of the ground magnetics survey.

 

 

 

  References:

1.    RNS 4145X (01 September 2025): Results of scout drilling at Viuda
Negra

2.    Kinross Gold 2024 Annual Mineral Resource and Resource Statement

3.    Kinross Gold 2015 Annual Mineral Resource and Resource Statement

4.    NI 43-101 Technical Report on the Feasibility Study for the Fenix
Gold Project

 

 

 

 

Enquiries:

 

 Great Southern Copper plc             c/o BlytheRay
 Sam Garrett, Chief Executive Officer  +44 (0) 20 7138 3204

 SI Capital Limited
 Nick Emerson                          +44 (0) 1483 413500

 BlytheRay
 Tim Blythe / Megan Ray                +44 (0) 20 7138 3204

                                       GSC@blytheray.com

 

Notes for Editors:

 

About Great Southern Copper

 

Great Southern Copper PLC is a UK-listed mineral exploration company focused
on the discovery of copper-gold-silver deposits in Chile. The Company has the
option to acquire mining rights to 100% of Especularita project in the
under-explored coastal belt of Chile that is prospective for large scale
copper-gold-silver deposits. Chile is a globally significant mining
jurisdiction being the world's largest producer and exporter of copper.

 

The Especularita Project is located in the coastal metallogenic belt of Chile
which hosts significant copper mines and deposits, including Teck's Carmen de
Andacollo copper mine, and boasts excellent access to infrastructure such as
roads, power and ports. Significant historical small-scale and artisanal
workings for both copper and gold are readily evident in the exploration
project area. The coastal belt offers deposit type optionality for copper
including porphyry and IOCG style deposits as well as newly recognised
intrusive-related copper and gold deposits.

 

Great Southern Copper is strategically positioned to support the global market
for copper - a critical battery metal in the clean energy transition around
the world. The Company is actively engaged in exploration and evaluation work
programmes targeting both large tonnage, low to medium grade Cu-Au as well as
high-grade Cu-Ag-Au deposits.

 

Further information on the Company is available on the Company's website:
https://gscplc.com (https://gscplc.com)

 

Competent Person Statement

 

The information in this announcement that relates to exploration results is
based on and fairly represents information reviewed or compiled by Mr Sam
Garrett, a Competent Person who is a Member of the Australian Institute of
Geoscientists and a Fellow of the Society of Economic Geologists. Mr Garrett
is the CEO and a shareholder of Great Southern Copper PLC. Mr Garrett has
sufficient experience that is relevant to the styles of mineralisation and
types of deposit 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 Garrett has provided his prior written consent to the
inclusion in this announcement of the matters based on information in the form
and context in which it appears.

 

This announcement includes information that relates to Exploration Results
prepared and first disclosed under the JORC Code (2012) and extracted from the
Company's previous LSE announcements as noted, and the Company's Prospectus
dated 20 December 2021. Copies of these announcements are available from the
LSE Announcements page of the Company's website: www.gscplc.com
(http://www.gscplc.com) .

 

The Company confirms that it is not aware of any new information or data that
materially affects the information included within the Prospectus dated 20
December 2021.

 

Forward Looking and Cautionary Statements

Some statements in this announcement regarding estimates or future events are
forward-looking statements. They include indications of, and guidance on,
future earnings, cash flow, costs and financial performance. Forward-looking
statements include, but are not limited to, statements preceded by words such
as "planned", "expected", "projected", "estimated", "may", "scheduled",
"intends", "anticipates", "believes", "potential", "predict", "foresee",
"proposed", "aim", "target", "opportunity", "could", "nominal", "conceptual"
and similar expressions. Forward-looking statements, opinions and estimates
included in this report are based on assumptions and contingencies which are
subject to change without notice, as are statements about market and industry
trends, which are based on interpretations of current market conditions.
Forward-looking statements are provided as a general guide only and should not
be relied on as a guarantee of future performance. Forward-looking statements
may be affected by a range of variables that could cause actual results to
differ from estimated or anticipated results and may cause the Company's
actual performance and financial results in future periods to materially
differ from any projections of future performance or results expressed or
implied by such forward-looking statements. So, there can be no assurance that
actual outcomes will not materially differ from these forward-looking
statements.

 

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