REG - Rome Resources PLC - Maiden MRE Confirms Large, Multi-Metallic System

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RNS Number : 4101F  Rome Resources PLC  30 October 2025

This announcement contains inside information for the purposes of Regulation
11 of the Market Abuse (Amendment) (EU Exit) Regulations 2019/310. With the
publication of this announcement via a Regulatory Information Service, this
inside information is now considered to be in the public domain.

 

30 October 2025

 

Rome Resources plc

("Rome Resources", the "Company" or the "Group")

 

Maiden Mineral Resource Confirms Large, Multi-Metallic System at Bisie North

 

Rome Resources (AIM: RMR), the DRC-focused tin and copper explorer, is
pleased to announce the publication of its maiden mineral resource estimate
("MRE") for its Bisie North Project, confirming the presence of a large,
multi-metallic tin-copper-zinc system across the Company's Kalayi and Mont
Agoma prospects.

 

The MRE, prepared by The MSA Group (Pty) Ltd ("MSA") in accordance with the
Canadian Institute of Mining, Metallurgy and Petroleum ("CIM") Best Practice
Guidelines and reported in accordance with the 2014 CIM Definition Standards
for Mineral Resources & Mineral Reserves, provides the first
quantification of resources within the Bisie North licence area and underlines
the potential for significant resource growth through further drilling.

 

MRE highlights

 

·    Based on diamond drillholes completed by Rome Resources between 2023
and 2025:

o  Mont Agoma - 33 holes

o  Kalayi - 18 holes

 

·    Confirms significant tin, copper, zinc and silver mineralisation
within large polymetallic system:

o  Mont Agoma: wide polymetallic zone with dominant copper near surface, tin
increasing at depth as seen in analogous deposits

o  Kalayi: near-surface high-grade tin, open at depth and expected to
increase in width and grade

 

·    Combined Inferred Mineral Resource:

10.6 kt Sn | 46.9 kt Cu | 86.2 kt Zn | 1.46 Moz Ag

 

·    The MRE indicates that only a fraction of the prospective licence
area has been explored, with drilling to date extending to just 220 - 250
metres depth, leaving substantial scope for further discovery within the wider
licence area

 

·    Internal exploration target:

Rome Resources' geological team estimates an additional 102 - 260 kt of
tin could be defined through deeper and step-out drilling

 

·    Results from the Mont Agoma East zone, where a near-surface, 23
metre zone of high-grade tin mineralisation has been confirmed, will be
incorporated into a follow-up MRE

 

·    Tin grades at Mont Agoma have been shown to increase with depth, a
trend consistent with analogous systems such as Alphamin's Bisie
mine and Minsur's San Rafael deposit in Peru, both of which demonstrate tin
grade strengthening in deeper  parts of the system

 

Corporate Update

 

Following the publication of the maiden MRE, which confirms a large,
multi-metallic system at Bisie North, the Company will continue engaging with
potential strategic partners to support future project development.

 

The Board is in early-stage discussions regarding potential acquisitions to
increase its ownership interests in exploration permit PR15130 and mineral
exploration permit PR13274. These remain subject to the execution of legally
binding agreements, and there can be no certainty that final binding terms
will be agreed or as to timing. Further updates will be provided as
discussions progress.

 

Paul Barrett, Chief Executive Officer of Rome Resources, commented:

 

"This maiden resource estimate marks a major milestone for Rome Resources and
a significant validation of the scale and multi-metallic potential of the
Bisie North Project. The results suggest that we are only beginning to define
a very substantial tin and copper system, with mineralisation remaining open
at depth and along strike.

 

Based on internal modelling, Rome Resources has defined a low-to-high
case exploration target of between 102,000 and 260,000 tonnes of contained
tin, underscoring the considerable potential beyond the current resource
envelope. The neighbouring Alphamin Bisie mine, along the same geological
trend, has demonstrated that tin grades and widths increase significantly with
depth, and we believe Mont Agoma may follow a similar pattern.

 

The MRE provides a strong foundation for the next phase of work, which will
include deeper drilling in the main Mont Agoma zone, drilling out the
high-grade Mont Agoma East zone ahead of a follow-up MRE, and continued
testing of additional targets across the licence area.

 

With Bisie North now defined as a large, multi-commodity system, we are well
positioned to engage with strategic partners and to build on this momentum
through the next phase of exploration and resource growth."

 

The exploration targets identified as part of the next phase of work are
preliminary in nature and based on internal estimates derived from geological
modelling. In this regard, there has been insufficient exploration to define a
Mineral Resource, and it is uncertain whether further exploration will result
in the estimation of a Mineral Resource.

 

Mineral Resource Estimate MRE

 

Following the completion of the Company's 2024/2025 drilling programme at its
Kalayi and Mont Agoma prospects, the Company engaged MSA to prepare a maiden
Mineral Resource Estimate (MRE) in respect of its Bisie North project, key
findings are summarised below.

 

The maiden MRE assesses the volumes associated with the tin intercepts
previously reported at Kalayi and Mont Agoma along with the copper, zinc and
silver encountered in Mont Agoma.

The newly discovered Eastern Tin Zone seen in the shallow weathered zone of
hole MADD030, as previously announced by the Company on 15 September 2025, is
not included in the maiden MRE. Notwithstanding this, it is intended that the
newly discovered Eastern Tin Zone will be included in an updated MRE, to be
published at a later date.

The Bisie North maiden MRE is based on diamond drillholes that were drilled
from 2023 to 2025 by Rome Resources. The Mont Agoma maiden MRE is based on the
results of 33 diamond drillholes and there were eighteen diamond drillholes
completed at Kalayi.

The maiden MRE was prepared in accordance with the CIM Best Practice
Guidelines and is reported in accordance with the 2014 CIM Definition
Standards for Mineral Resources & Mineral Reserves.

 

Mont Agoma

 

The Mont Agoma MRE is reported using a net smelter return cut-off of 90
USD/tonne. A summary of the Mont Agoma MRE is presented in Table 1. A grade
tonnage table is included to assess sensitivity to cut-off grade (Table 2).

 

 Table 1

Mineral Resource Estimate for Mont Agoma as at 21 October, 2025 at a 90
 USD/tonne NSR cut-off
 Category  Tonnes  NSR       Cu    Sn    Zn    Ag      Cu     Sn     Zn     Ag

(Mt)
(USD/t)
(%)
(%)
(%)
(g/t)
(kt)
(kt)
(kt)
(Moz)
 Inferred  3.16    166       1.45  0.19  2.72  14.3    45.9   6.1    86.2   1.46
 Total     3.16    166       1.45  0.19  2.72  14.3    45.9   6.1    86.2   1.46

Notes:

1.     All tabulated data have been rounded and as a result minor
computational errors may occur.

2.     Mineral Resources, which are not Mineral Reserves, have no
demonstrated economic viability. There is no guarantee that all or any part of
the Mineral Resource will be converted into a Mineral Reserve. The estimate of
Mineral Resources may be materially affected by geology, environment,
permitting, legal title, taxation, socio-political, marketing, metal prices,
costs or other relevant issues.

3.     Mt = million tonnes, kt = thousand tonnes; Moz = million ounces.

4.     Reasonable prospects for eventual economic extraction (RPEEE) are
based on the following assumed parameters sourced from public domain
information including studies on similar deposits in the region:

·      NSR was estimated per metal using assumed off-site costs and
price:

·     Sn price USD/tonne 36,600, Cu price 11,111 USD/tonne, Zn price
3,450 USD/tonne, Ag price 35 USD/oz.

·     Transport of concentrate USD 730/t, Treatment and Refining, Sn USD
200/t, Cu USD 290/t, Zn USD 190/t

·     Payability Sn 96.5%, Cu 96.5%, Zn 83.5%, Ag 88%.

·      Extraction is assumed to be open-pit mining with a gravity and
flotation circuit. A pit-shell was constructed to constrain the Mineral
Resource. The following assumed on-site parameters were applied:

·     Concentrator recovery: Sn 65%, Cu 90%, Zn, 90%, Ag 83%

·     Mining dilution - included in 5 m by 20 m by 5 m regularised block

·     Pit slope: 28° weathered, 55° fresh

·     Mining costs: USD 4/t fresh mineralised, USD 2/t fresh waste and
weathered mineralised, USD 1/t weathered waste

·     Mill costs: USD 30/t, on site infrastructure and G&A USD 45/t.

5.     The weathered mineralisation was not included in the Mineral
Resource for copper, zinc and silver, it being assumed that it is extensively
leached and in oxide form.

6.     The assessment to satisfy the criteria of RPEEE is a high-level
estimate and is not an attempt to estimate Mineral Reserves.

 

 Table 2

Grade (NSR) - tonnage table for Mont Agoma Inferred Mineral Resource as at 21
 October, 2025
 NSR Cut-Off  Tonnes  NSR       Cu    Sn    Zn    Ag      Cu     Sn     Zn     Ag

(USD/t)
(Mt)
(USD/t)
(%)
(%)
(%)
(g/t)
(kt)
(kt)
(kt)
(Moz)
 60           5.08    131       1.06  0.16  2.55  11.2    54.1   8.2    129.4  1.83
 70           4.31    143       1.19  0.17  2.55  12.2    51.4   7.5    110.1  1.69
 80           3.70    154       1.32  0.19  2.63  13.2    48.7   6.8    97.2   1.56
 90           3.16    166       1.45  0.19  2.72  14.3    45.9   6.1    86.2   1.46
 100          2.70    178       1.59  0.20  2.88  15.6    43.0   5.3    78.0   1.36
 110          2.33    189       1.73  0.20  3.04  16.7    40.4   4.7    70.8   1.25
 120          2.03    200       1.87  0.20  3.17  17.7    38.1   4.1    64.6   1.16

Notes:

1.     All tabulated data have been rounded and as a result minor
computational errors may occur.

2.     The Mineral Resource is highlighted in bold.

 

Kalayi

 

The Kalayi MRE is reported at a cut-off grade of 0.85% tin (Sn). A summary of
the Kalayi MRE is presented in Table 3. A grade tonnage table is included to
assess sensitivity to cut-off grade (Table 4).

 

 Table 3

Mineral Resource Estimate for Kalayi as at 21 October, 2025 at a 0.85% Sn
 cut-off
 Category  Tonnes  Sn Grade  Sn Content

(Mt)
(%)
(kt)
 Inferred  0.33    1.36      4.47
 Total     0.33    1.36      4.47

Notes:

1.     All tabulated data have been rounded and as a result minor
computational errors may occur.

2.     Mineral Resources, which are not Mineral Reserves, have no
demonstrated economic viability. There is no guarantee that all or any part of
the Mineral Resource will be converted into a Mineral Reserve. The estimate of
Mineral Resources may be materially affected by geology, environment,
permitting, legal title, taxation, socio-political, marketing, metal prices,
costs or other relevant issues.

3.     Mt = Million tonnes, kt = thousand tonnes.

4.     Reasonable prospects for eventual economic extraction (RPEEE) are
based on the following assumed parameters:

·      Tin Price USD/tonne 36,600

·      Recovery 75% for 70% concentrate grade, 3.5% DRC royalty, 97%
payability

·      Total on- and off-site costs USD 172 per tonne (run-of-mine).

5.     The mining method is assumed to be underground open stoping.
Dilution of 20% was applied with a minimum mining width of 1.1 m.

6.     The weathered mineralisation was not included; it being assumed
that it is partially extracted by artisanal mining and not conducive to formal
underground mining.

7.     The assessment to satisfy the criteria of RPEEE is a high-level
estimate and is not an attempt to estimate Mineral Reserves.

 

 Table 4

Grade tonnage table for Kalayi Inferred Mineral Resource as at 21 October,
 2025
 Cut-off grade Cu  Tonnes  Sn Grade  Sn Content

(%)
(Mt)
(%)
(kt)
 0.70              0.37    1.30      4.79
 0.75              0.36    1.32      4.71
 0.80              0.35    1.33      4.65
 0.85              0.33    1.36      4.47
 0.90              0.31    1.39      4.31
 0.95              0.28    1.45      3.99
 1.00              0.25    1.51      3.70

Notes:

1.     All tabulated data have been rounded and as a result minor
computational errors may occur.

2.     The Mineral Resource is highlighted in bold.

 

The full unedited CIM compliant maiden Mineral Resource Estimate is available
for viewing at:

 

http://www.rns-pdf.londonstockexchange.com/rns/4101F_1-2025-10-29.pdf
(http://www.rns-pdf.londonstockexchange.com/rns/4101F_1-2025-10-29.pdf)

 

 

*Rome Resources holds a 51 per cent. interest in Mont Agoma SARL, which
in-turn is the current sole legal owner of PR15130. Separately, Rome Resources
holds a 71 per cent. interest in MediDoc RD Congo SARL, which in-turn holds a
72.5 per cent. interest in Kalayi Tin SARL ("Kalayi"). Kalayi is the current
sole legal owner of PEPM 13274.

 

For further information, please contact:

 

 

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Qualified Person Statement

 

Dr Deon Vermaakt is a consultant of Rome Resources plc, a qualified geologist
and a registered Professional Natural Scientist (Geological Science) with the
South African Council for Natural Scientific Professions (SACNASP Reg. No.
400074/03). Dr Vermaakt is a qualified person (QP) under NI 43-101 and as
defined by the AIM Note for Mining, Oil and Gas Companies and has reviewed and
approved the scientific and technical information contained in this news
release.

 

This Announcement is made in accordance with the Company's obligations under
Article 17 of UK MAR and the person responsible for arranging for the release
of this Announcement on behalf of Rome Resources is Paul Barrett, Chief
Executive Officer.

 

Glossary of abbreviations

 

 "Ag"                    Silver
 "CIM"                   Canadian Institute of Mining, Metallurgy and Petroleum
 "Cu"                    Copper
 "G&A"                   General & administrative
 "g/t"                   Grams per tonne
 "kt"                    Kiloton
 "m"                     Metre
 "Moz"                   Million ounces
 "Mt"                    Million tonnes
 "NSR"                   Net Smelter Return
 "RPEE"                  Reasonable prospects for economic extraction
 "Sn"                    Tin
 "USD/T" or "USD/Tonne"  USD per tonne
 "Zn"                    Zinc

 

Glossary of technical terminology

 

 "Indicated Mineral Resource"  An Indicated Mineral Resource is that part of a Mineral Resource for which
                               quantity, grade or quality, densities, shape and physical characteristics are
                               estimated with sufficient confidence to allow the application of Modifying
                               Factors in sufficient detail to support mine planning and evaluation of the
                               economic viability of the deposit. Geological evidence is derived from
                               adequately detailed and reliable exploration, sampling and testing and is
                               sufficient to assume geological and grade or quality continuity between points
                               of observation. An Indicated Mineral Resource has a lower level of confidence
                               than that applying to a Measured Mineral Resource and may only be converted to
                               a Probable Mineral Reserve

 "Inferred Mineral Resource"   An Inferred Mineral Resource is that part of a Mineral Resource for which
                               quantity and grade or quality are estimated on the basis of limited geological
                               evidence and sampling. Geological evidence is sufficient to imply but not
                               verify geological and grade or quality continuity. An Inferred Mineral
                               Resource has a lower level of confidence than that applying to an Indicated
                               Mineral Resource and must not be converted to a Mineral Reserve. It is
                               reasonably expected that the majority of Inferred Mineral Resources could be
                               upgraded to Indicated Mineral Resources with continued exploration

 "Measured Mineral Resource"   A Measured Mineral Resource is that part of a Mineral Resource for which
                               quantity, grade or quality, densities, shape, and physical characteristics are
                               estimated with confidence sufficient to allow the application of Modifying
                               Factors to support detailed mine planning and final evaluation of the economic
                               viability of the deposit. Geological evidence is derived from detailed and
                               reliable exploration, sampling and testing and is sufficient to confirm
                               geological and grade or quality continuity between points of observation. A
                               Measured Mineral Resource has a higher level of confidence than that applying
                               to either an Indicated Mineral Resource or an Inferred Mineral Resource. It
                               may be converted to a Proven Mineral Reserve or to a Probable Mineral Reserve

 "Mineral Reserves"            A Mineral Reserve is the economically mineable part of a measured and/or
                               Indicated Mineral Resource. It includes diluting materials and allowances for
                               losses, which may occur when the material is mined or extracted and is defined
                               by studies at pre-feasibility or feasibility level as appropriate that include
                               application of Modifying Factors. Such studies demonstrate that, at the time
                               of reporting, extraction could reasonably be justified. The reference point at
                               which Mineral Reserves are defined, usually the point where the ore is
                               delivered to the processing plant, must be stated. It is important that, in
                               all situations where the reference point is different, such as for a saleable
                               product, a clarifying statement is included to ensure that the reader is fully
                               informed as to what is being reported

 "Mineral Resources"           Mineral Resource is a concentration or occurrence of solid material or
                               economic interest in or on the Earth's crust in such form, grade (or quality),
                               and quantity, that there are reasonable prospects for eventual economic
                               extraction. The location, quantity, grade (or quality), continuity and other
                               geological characteristics of a Mineral Resource are known, estimated or
                               interpreted from specific geological evidence and knowledge, including
                               sampling. Mineral Resources are subdivided, in order of increasing geological
                               confidence, into Inferred, Indicated and Measured categories

 "Modifying Factors"           Modifying Factors are considerations used to convert Mineral Resources to
                               Mineral Reserves. These include, but are not restricted to, mining,
                               processing, metallurgical, infrastructure, economic, marketing, legal,
                               environmental, social and governmental factors

 "Probable Mineral Reserves"   A Probable Mineral Reserve is the economically mineable part of an indicated,
                               and in some circumstances, a Measured Mineral Resource. The confidence in the
                               Modifying Factors applying to a Probable Mineral Reserve is lower than that
                               applying to a Proven Mineral Reserve

 "Proven Mineral Reserves"     A Proven Mineral Reserve is the economically mineable part of a Measured
                               Mineral Resource. A Proven Mineral Reserve implies a high degree of confidence
                               in the Modifying Factors

 

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