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Page 1
                         LAPORAN TENTANG AKTIVITAS EKSPLORASI
                     OLEH ANAK PERUSAHAAN PT DARMA HENWA TBK
       (EXPLORATION ACTIVITIES REPORT BY SUBSIDIARY of PT DARMA HENWA TBK)


Nama Perusahaan                             :    PT GAYO MINERAL RESOURCES (“PT GMR”)
(Name of Company)
Tahapan Kegiatan IUP                        :    Eksplorasi (Exploration)
(Phase of Activity of Contract Work)
Laporan Eksplorasi Periode                  :    1 Januari - 31 Maret 2026
(Exploration Report Period)

A   Daerah Explorasi                                        Exploration Areas
       1. Upper Tengkareng (UT)                                 1. Upper Tengkareng (UT)
       2. Southeast Tengkareng (SET)                            2. Southeast Tengkareng (SET)

B   Biaya Eksplorasi                                        Exploration Cost
    Rp 23,469,664,408                                       Rp 23,469,664,408

C Bentuk Kegiatan Eksplorasi                                Exploration Activities
                                                            1. Completed the Phase 2a resource drilling
    1. Menyelesaikan kegiatan program pengeboran
                                                                program at the UT Prospect in February 2026
       sumber data fase 2a di Prospek UT pada bulan
                                                                and continued the Phase 2b drilling program
       Februari 2026 dan melanjutkan program
                                                                with a target of 20.000 m, including 3
       pengeboran fase 2b dengan target 20,000m,
                                                                geotechnical drill holes.
       termasuk 3 titik pengeboran geoteknik.

    2. Melanjutkan pengiriman sampel batuan inti 2. Continued submission of drill core samples
       bor untuk analisis geokomia ICP multi elemen for geochemical analysis (ICP multi-
       (Cu, Ag, Mo, As, Pb, Zn, dll) dan Fire Assay elements: Cu, Ag, Mo, As, Pb, Zn, etc.) and
       untuk Au ke Laboratorium PT Sucofindo.       Fire Assay (Au) to PT Sucofindo Laboratory.
       Pengiriman termasuk sampel untuk program     The submission includes regular QAQC
       regular QAQC sampel protokol.                sample control protocol

    3. Melanjutkan analisis sample untuk uji
                                                   3. Continued metallurgical test work (flotation,
       metalurgi (flotasi, pemisahan gravitasi,
                                                      gravity   separation,     leaching,      and
       pelindian, dan penggerusan) di Laboratorium
                                                      comminution) at PT Geoservices Laboratory.
       PT Geoservices.

                                                            4. Updated internal geological and resource
    4. Melakukan pembaruan pemodelan geologi
                                                               models for the UT Prospect.
       internal dan sumber daya untuk Prospek UT.

    5. Melakukan penjajakan beberapa vendor 5. Conducted initial engagement with several
       terkait pekerjaan pelaporan standar JORC dan vendors for JORC-compliant standard
       pemrosesan metalurgi.                        reporting and metallurgical processing work.
                                                            6. Continued geological mapping activities at
    6. Melanjutkan kegiatan pemetaan geologi untuk
                                                               the SET Prospect, including additional rock
       Prospek SET, termasuk pengambilan
                                                               sampling and initial drill plan.
                                         PT Gayo Mineral Resources
                             Gedung Bakrie Tower Lantai 8, Rasuna Epicentrum,
                     Jalan H.R. Rasuna Said, Karet Kuningan, Setiabudi, Jakarta Selatan
                                T. (+62 21) 29912350 – F. (+62 21) 29912364
Page 2
      tambahan contoh batuan dan perencanaan
      lokasi pengeboran awal.
D Pihak-Pihak yang Terlibat                  Involved Parties
     1. PT Arfa Explorindo Nusantara           1. PT Arfa Explorindo Nusantara
     2. PT Samgeo Bor                          2. PT Samgeo Bor
     3. PT Sucofindo                           3. PT Sucofindo
     4. PT Geoservice                          4. PT Geoservice
     5. PT MiningOne Indonesia                 5. PT MiningOne Indonesia
E   Metode Pengujian                                         Testing Methods
      1. AAS                                                   1. AAS
      2. Specific Gravity                                      2. Specific Gravity
      3. Fire Assay                                            3. Fire Assay
      4. ICP OES 30 elements                                   4. ICP OES 30 elements
      5. Metallurgical Test                                    5. Metallurgical Test
      6. Physical Properties                                   6. Physical Properties
      7. Uniaxial Compressive Strength                         7. Uniaxial Compressive Strength
      8. Point Load Index                                      8. Point Load Index
      9. Vein Density Analysist                                9. Vein Density Analysist
      10. Magnetic Susceptibility                              10.Magnetic Susceptibility
    Kemajuan Eksplorasi Terhadap periode
F                                                   Exploration Progress (vs Previous Period)
    sebelumnya
    1. Total pencapaian pengeboran selama
                                                    1. Total drilling achievement during Q1 2026
       Triwulan I tahun 2026 adalah 2.747,2 m.
                                                        reached 2,747.2 m, completing the Phase 2a
       Kegiatan ini merupakan bagian dari
                                                        resource drilling program using 4 drilling rigs.
       penyelesaian program pengeboran sumber
                                                        The program has progressed into Phase 2b
       daya fase 2a dengan menggunakan 4 mesin
                                                        utilizing 3 drilling rigs, including 3 planned
       bor. Program pengeboran berlanjut ke fase 2b
                                                        holes for geotechnical and hydrological
       dengan menggunakan 3 mesin bor, termasuk
                                                        investigations. Total cumulative drilling
       rencana 3 lubang bor untuk keperluan
                                                        progress Project to Date is 31,485.75 m.
       geoteknik dan hidrologi. Total pencapaian
       pengeboran (Project to Date) adalah
       31,485.75 m.
    2. Total sampel batuan inti bor untuk analisis 2. The total drill core samples for geochemical
       geokimia ICP multi elements (Cu, Ag, Mo, As,   analysis ICP multi-elements (Cu, Ag, Mo, As,
       Pb, Zn, dll) dan Fire Assay untuk Au ke        Pb, Zn, etc.) and Fire Assay for Au submitted
       Laboratorium PT Sucofindo yang telah keluar    to PT Sucofindo Laboratory with analytical
       hasil analisisnya selama Triwulan I tahun      results returned during Q1 2026 was 928
       2026 adalah 928 sampel, dan akumulasi          samples, and the cumulative sample with
       sampel yang telah keluar hasilnya adalah       completed results is 14.567 samples.
       14,567 sampel. Pengiriman sampel ini           Sample submissions include the standard
       termasuk program protokol standar QAQC.        QAQC sample protocol program.

    3. Telah menyelesaikan rangkaian uji metalurgi 3. Metallurgical test work (flotation, gravity
       (flotasi, pemisahan gravitasi, pelindian, dan  separation, leaching, and comminution) has
       penggerusan) untuk domain sampel QDP.          been completed for the QDP domain.
       Selanjutnya akan dilakukan untuk domain        Testing will continue for the QFD and
       QFD dan Sediment Breccia.                      Sediment Breccia domains.

                                          PT Gayo Mineral Resources
                              Gedung Bakrie Tower Lantai 8, Rasuna Epicentrum,
                      Jalan H.R. Rasuna Said, Karet Kuningan, Setiabudi, Jakarta Selatan
                                 T. (+62 21) 29912350 – F. (+62 21) 29912364
Page 3
    4. Total 36 sampel batuan tambahan telah 4. An additional 36 rock samples from the SET
       dikirimkan untuk analisis geokimia ICP multi  Prospect were submitted for geochemical
       elements (Cu, Ag, Mo, As, Pb, Zn, dll) dan FA analysis (ICP multi-elements: Cu, Ag, Mo,
       untuk Au ke Laboratorium PT Sucofindo dari    As, Pb, Zn, etc.) and Fire Assay (Au) to PT
       Prospek SET.                                  Sucofindo Laboratory.

    5. Persiapan penyusunan dokumen Studi 5. Preparation of Feasibility Study (FS) and
       Kelayakan dan AMDAL untuk disampaikan ke AMDAL documents for submission to ESDM
       ESDM sebagai persyaratan perubahan       as part of the requirements for upgrading the
       perizinan menjadi IUP Operasi Produksi.  license to IUP Production Operation status.

G Rencana Selanjutnya                                       Next Plan

    1. Melanjutkan pengeboran fase 2b di Prospek 1. Continuing Phase 2b drilling at the UT
       UT untuk meningkatkan tingkat keyakinan      Prospect to improve resource confidence,
       sumber daya, studi geoteknik, hidrologi, dan including geotechnical, hydrological and
       metallurgy.                                  metallurgy studies.
    2. Melanjutkan pemetaan geologi detail di area 2. Continuing detailed geological mapping in
       Prospek SET and rencana pengeboran awal        SET Prospect area and initial exploration
       eksplorasi.                                    drilling plan.
    3. Melanjutkan pengiriman sampel batuan inti ke 3. Continuing submission of drill core samples
       Laboratorium PT Sucofindo.                      to PT Sucofindo Laboratory.
    4. Melakukan percepatan perpanjangan IUP 4. Accelerating the extension of IUP
       Eksplorasi dan peningkatan izin menjadi IUP Exploration and upgrading to IUP Production
       Operasi Produksi.                           Operation.
H Hambatan Eksplorasi                                       Exploration Constraints

    1. Keadaan kahar berupa bencana alam banjir 1. Force majeure conditions due to flash floods
       bandang dan tanah longsor yang melanda      and landslides in Aceh Province and
       Provinsi Aceh dan sekitarnya yang           surrounding areas, causing disruption to site
       menyebabkan akses dan logistik terhambat.   access and logistics.

    2. Sedang dalam proses perpanjangan IUP 2. Currently undergoing the extension process
       Eksplorasi                              of the Exploration IUP
I   Perizinan/Persetujuan Baru Yang Diperoleh               New Permits/Approvals Obtained
    -                                                       -




                                         PT Gayo Mineral Resources
                             Gedung Bakrie Tower Lantai 8, Rasuna Epicentrum,
                     Jalan H.R. Rasuna Said, Karet Kuningan, Setiabudi, Jakarta Selatan
                                T. (+62 21) 29912350 – F. (+62 21) 29912364

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Names mentioned 13 people and organisations named in the text · linked when the evidence is strong

linked org DARMA HENWA TBK p.1 ×5
unresolved org PT GAYO MINERAL RESOURCES · Nama Perusahaan p.1 ×4
unresolved org PT GMR p.1
unresolved org PT Sucofindo. p.1 ×6
unresolved org PT Sucofindo Laboratory. Pengiriman p.1
unresolved org PT Geoservices Laboratory. p.1
unresolved org PT Geoservices. p.1
unresolved org PT Arfa Explorindo Nusantara p.2 ×2
unresolved org PT Samgeo Bor p.2 ×2
unresolved org PT Geoservice p.2 ×2
unresolved org PT MiningOne Indonesia p.2
unresolved org PT MiningOne Indonesia E p.2
unresolved org PT Sucofindo Laboratory p.2 ×2

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