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No. 086/GEMS-CS/X/2025                                                                      Jakarta, 10 Oktober/October 2025

Kepada Yth.:
Direksi PT Bursa Efek Indonesia
Gedung Bursa Efek Indonesia Tower I
Jln. Jend. Sudirman Kav 52-53
Jakarta 10190

U.p. : : Ibu Vera Florida (Kepala Divisi Penilaian Perusahaan 2) /
       (Head of Corporate Valuation Division 2)

Perihal : Laporan Aktivitas Eksplorasi periode Q3 2025              Subject : Exploration Activity Q3 2025 Report

Dengan hormat,                                                      Sincerely,

Sehubungan dengan Peraturan PT Bursa Efek Indonesia                 In accordance to Indonesia Stock Exchange Regulation
Nomor I-E tanggal 31 Desember 2022 tentang Kewajiban                No. I-E dated 31 December 2022 concerning
Penyampaian Informasi, maka dengan ini kami                         Information Submission Obligation, we hereby submit
sampaikan Laporan Aktivitas Eksplorasi Pertambangan                 the Exploration Activity for the period of Q3 2025 of the
periode Q3 2025 di lingkungan anak-anak Perusahaan                  Company’s subsidiaries as attached.
PT Golden Energy Mines Tbk (“Perseroan”) sebagaimana
terlampir.

Dalam      hal     terdapat  perbedaan penafsiran                   In the event there is any difference of
informasi yang diumumkan dalam Bahasa Inggris dan                   interpreting the information notified in English
Bahasa Indonesia, maka informasi yang digunakan                     language and Indonesian language, the Indonesian
sebagai acuan adalah informasi dalam Bahasa                         language shall prevail.
Indonesia.

Demikian kami sampaikan. Atas perhatiannya kami Thank you for your attention and co-operation.
ucapkan terima kasih.

Hormat kami/Sincerely yours,
PT Golden Energy Mines Tbk




Sudin, SH
Corporate Secretary



Tembusan/Copies :
   - Direksi Perseroan/Board of Directors of the Company.
                                        PT. Golden Energy Mines Tbk.
               Sinar Mas Land Plaza Tower II, 6th Floor Jl. MH. Thamrin No. 51 Kav. 22, Jakarta Pusat 10350
                                   Phone: (62) 21 50186 888 , Fax: (62) 21 3199 0319
                                        Website: www.goldenenergymines.com
Page 2
1. PT Kuansing Inti Makmur (“KIM”) dan anak perusahaan
   (KIM Blok) / and its subsidiaries (KIM Block)
   Tidak ada kegiatan eksplorasi di area KIM Blok pada There is no exploration activity in the mine area of
   periode Q3 2025.                                    KIM Block for the period of Q3 2025.

2. PT Borneo Indobara (“BIB”)
   2.1. Daerah Eksplorasi                                  2.1. Exploration Activity
        Kegiatan pengeboran eksplorasi meliputi 3 kegiatan      Exploration drilling activities include 3 main
        utama, yaitu pengeboran eksplorasi preproduksi,         activities, namely preproduction exploration
        pengeboran eksplorasi pengembangan, dan                 drilling, development exploration drilling, and
        pengeboran geoteknik.                                   geotechnical drilling.
        Kegiatan pengeboran preproduksi dilakukan untuk         Preproduction drilling activities are carried
        melengkapi data pemodelan geologi dan kualitas          out to complement geological modeling data
        batubara pada masing-masing area. Pengeboran            and coal quality in each area. Development
        eksplorasi     pengembangan       bertujuan untuk       exploration drilling aims to obtain lithology
        mendapatkan data litologi dan kualitas batubara         and coal quality data for geological modeling
        untuk pembuatan model geologi serta mendukung           and to support the addition of new coal
        penambahan sumberdaya batubara baru pada area           resources in areas where exploration has
        yang belum pernah dilakukan kegiatan eksplorasi.        never been carried out. Geotechnical drilling
        Kegiatan pengeboran geoteknik dilakukan untuk           activities are carried out to determine the
        mengetahui daya dukung tanah dan sifat fisik            carrying capacity of the soil and the physical
        batuan pada area pit penambangan dan disposal           properties of the rock in the mining area and
        serta di area project perusahaan.                       disposal area in the company.
        Kegiatan pengeboran periode Q3 2025 dilakukan           Drilling activities in Q3 2025 were carried out
        pengeboran eksplorasi preproduksi di area               by preproduction exploration in North
        Girimulya Utara dan pengeboran geoteknik di area        Girimulya and geotechnical drilling in South
        Girimulya Selatan, Kusan Atas, Kusan Bawah dan          Girimulya, Kusan Atas, Kusan Bawah and
        Sebamban Bawah.                                         Sebamban Bawah.

  2.2. Metode Pengeboran                                  2.2. Drilling Methods
       Pada periode Q3 2025, pengeboran eksplorasi             For the period of Q3 2025, preproduction
       preproduksi dilakukan dengan metode open hole           exploration drilling was carried out using
       dan part coring, sedangkan pengeboran geoteknik         open holes and part coring, while
       dilakukan dengan menggunakan metode SPT, coring         geotechnical drilling was carried out using
       dan pemasangan Piezometer. Kegiatan geofisika           SPT, coring methods and installing
       logging dilakukan di seluruh lubang bor yang telah      Piezometer. Geophysical logging activities are
       selesai dilakukan untuk memastikan kedalaman top        carried out in all drilled holes that have been
       dan bottom batubara sehingga ketebalan batubara         completed to ensure the depth of the top and
       dapat diketahui lebih akurat dan untuk mengetahui       bottom of the coal so that the thickness of
       varian dan karakteristik batuan non batubara            the coal can be known more accurately and
       berdasarkan perekaman gelombang gamma ray dan           to determine the characteristics of non-coal
       density.                                                rock based on recording gamma ray waves
                                                               and density.


                                           PT. Golden Energy Mines Tbk.
                  Sinar Mas Land Plaza Tower II, 6th Floor Jl. MH. Thamrin No. 51 Kav. 22, Jakarta Pusat 10350
                                      Phone: (62) 21 50186 888 , Fax: (62) 21 3199 0319
                                           Website: www.goldenenergymines.com
Page 3
   2.3. Pelaksanaan dan Pengawasan Kegiatan Eksplorasi           2.3. Exploration Activities Progress & Supervision
        Kegiatan pengeboran eksplorasi dan geoteknik                  Exploration and geotechnical drilling activities
        dilakukan oleh Departemen Survey, Geotech &                   carried out by the Survey, Geotech &
        Exploration (SGE) BIB.                                        Exploration (SGE) Department of BIB.
        Untuk mendukung kegiatan pengeboran eksplorasi                To support the preproduction exploration
        preproduksi dan eksplorasi pengembangan berupa                drilling and development exploration
        pengeboran open hole dan coring digunakan 2 unit              activities such as open hole and coring
        rig inhouse yaitu 1 unit tipe Jacro 175 dan 1 unit tipe       geotechnical drilling, units type of inhouse rig
        Jacro 500. Untuk pengeboran geoteknik dengan                  were used, which are 1 unit Jacro 175 and 1
        metode SPT digunakan 1 unit rig tipe Jacro 200.               unit Jacro 500. The geotechnical drilling with
        Seluruh unit rig dioperasikan oleh drilling operator          SPT method was used 1 unit rig of Jacro 200.
        BIB. Kontraktor pengeboran PT ICE mengoperasikan              All rig units were operated by BIB drilling
        4 unit rig tipe Jacro 300 dan 1 unit rig tipe Jacro 200.      operator. Drilling contractor PT ICE operated
        Kegiatan geofisika logging dilakukan oleh PT Surtech          4 units rig of Jacro 300 and 1 unit rig of Jacro
        Indonesia yang mengoperasikan 2 unit alat logging.            200. Geophysical logging activities were
                                                                      carried out by PT Surtech Indonesia, which
                                                                      operated 2 units of Geophysical logging.
        Seluruh kegiatan pengeboran disupervisi langsung              All drilling activities are directly supervised by
        oleh Wellsite Geologist, Departemen SGE dan                   the Wellsite Geologist, SGE Department and
        Evaluator Geologist Departemen Strategic, Plan &              Geologist Evaluator, Strategic, Plan &
        Optimization (SPO), seluruhnya dibawah Divisi Mine            Optimization (SPO) Department, all under the
        Development & Contract Management (MDC) BIB.                  Mine Development & Contract Management
                                                                      (MDC) Division of BIB.

   2.4. Kemajuan Eksplorasi                                2.4. Exploration Progress
        Kegiatan pengeboran eksplorasi selama periode Q3         Drilling exploration for the period of Q3 2025
        2025 adalah sebagai berikut :                            are as follows :
                   Tabel 1.1. Kemajuan Pengeboran Ekplorasi dan Geoteknik periode Q3 2025/
                       Progress in Exploration and Geotechnical Drilling Period of Q3 2025
                     Lubang Geoteknik (m) /                              Lubang Eksplorasi (m) /
                     Geotech Drilling                                    Exploration Drilling

Lokasi               Jumlah       Total kedalaman (m) /                  Jumlah       Total kedalaman (m) /
Location             lubang       Total Depth                            lubang       Total Depth
                     /                                                   /
                     Total        Drilling           Logging             Total        Drilling                Logging
                     Holes                                               Holes
Girimulya Utara          -                -                  -             19               2.911                  2.442,85
Girimulya Selatan        2              183              149,05             -                    -                    -
Kusan Atas               7              185              183,15             -                    -                    -
Kusan Bawah              3              102               99,85             -                    -                    -
Sebamban Bawah           7              203              201,45             -                    -                    -
                                              PT. Golden Energy Mines Tbk.
                    Sinar Mas Land Plaza Tower II, 6th Floor Jl. MH. Thamrin No. 51 Kav. 22, Jakarta Pusat 10350
                                        Phone: (62) 21 50186 888 , Fax: (62) 21 3199 0319
                                             Website: www.goldenenergymines.com
Page 4
  2.5. Biaya Eksplorasi                              2.5. Drilling Cost
       Untuk biaya eksplorasi selama periode Q3 2025      The exploration costs for the period of Q3
       adalah sebagai berikut :                           2025 are as follows :

               Tabel 1.2. Biaya Pengeboran Eksplorasi dan Geoteknik RIG Inhouse periode Q3 2025 /
                        Exploration and Geotechnial Drilling Cost for the period of Q3 2025

                                                                        Year to Date
                 Operating Expense
                                                Anggaran / Plan (Rp)           Realisasi / Realisation (Rp)
             Biaya Pengeboran /                Rp. 35.858.407.312,70          Rp. 26.303.247.928,70
             Drilling Cost


3. PT Trisula Kencana Sakti (TKS)
   Tidak ada kegiatan eksplorasi di area TKS pada periode There is no exploration activity in the mine area of
   Q3 2025.                                               TKS for the period of Q3 2025.

4. PT Berkat Satria Abadi (BSA) dan PT Wahana Rimba
   Lestari (WRL)
   Tidak ada kegiatan eksplorasi di area BSA dan WRL pada There is no exploration activity in the mine area of
   periode Q3 2025.                                       BSA and WRL for the period of Q3 2025.

5. PT Barasentosa Lestari (BSL)
   5.1. Daerah Eksplorasi                                                5.1. Daerah Eksplorasi
        Kegiatan pengeboran eksplorasi BSL periode Q3                       Drilling activities of BSL in Q3 2025 was
        2025 dilakukan di area Blok Belani Utara pada area                  conducted in the North Belani Block area
        koridor. Tipe pengeboran meliputi pengeboran                        (corridor). The drilling types included open
        open hole dan coring (partial) untuk mendapatkan                    hole and full coring to collect samples for coal
        sample kualitas batubara. Pengeboran pada Q3                        quality assessment. Notably, geophysical
        2025 tidak dilengkapi dengan pengukuran geofisika                   logging measurements were not performed
        logging.                                                            during this period.

  5.2. Metode Pengeboran                                                 5.2. Drilling Method
       Pelaksanaan pengeboran pada blok Belani                              Drilling activities at Belani Block is carried out
       dilaksanakan dengan memakai sistem grid, dengan                      using a grid system, with 50-100 meter
       jarak antara cross line 50-100 meter dan jarak antar                 distance of cross line and 10-75 meter drill
       lubang bor 10-75 meter, mengikuti jurus dan                          hole spacing, follow the strike and dip of coal
       kemiringan (down dip) pelapisan batuan hingga                        seam with maximum Depth around 60-90
       kedalaman maksimal 60-90 meter. Hal ini bertujuan                    meter. The purpose of grid system and
       untuk memaksimalkan stripping ratio (SR) dan                         control maximum Dept for determine of
       kemenerusan batubara. Rapatnya radius antar titik                    optimization stripping ratio (SR) and

                                           PT. Golden Energy Mines Tbk.
                  Sinar Mas Land Plaza Tower II, 6th Floor Jl. MH. Thamrin No. 51 Kav. 22, Jakarta Pusat 10350
                                      Phone: (62) 21 50186 888 , Fax: (62) 21 3199 0319
                                           Website: www.goldenenergymines.com
Page 5
    bor    disebabkan     adanya      indikasi  tingkat                  continuity of coal. The drill hole spacing is
    kompleksitas geologi yang tinggi pada area                           relatively close, because drilling area have
    pengeboran khususnya adanya struktur geologi                         high complexity geological condition, such as
    patahan dengan offset (throw) lebih besar dari 20                    structure geology fault with throw more than
    meter, bidang perlapisan (dip) yang berubah terjah                   20 meter. Beside that there are changed dip
    dari 26° menjadi 88° dan jurus perlapisan (strike)                   of coal seam from 26° to be 88°, strike of coal
    dari N 256 E menjadi N 135 E dan terdapat pola                       seam from N 256 E to be N 135 E and fold
    lipatan pada lapisan batuan yang telah terbuka                       major presence at exposed of mining area.
    (exposed).
    Pengeboran yang dilakukan yaitu tipe lubang                          Drilling was conducted with open hole and
    terbuka (open hole) dan part coring. Unit bor yang                   part coring type. The drill unit used are rigs
    digunakan adalah rig tipe Jacro-200 dengan                           type Jacro-200 with 4 inch (diameter 96 mm)
    diameter lubang bor (outside) HQ 4 inch (Ǿ 96 mm).                   drill holes (outside) HQ.
    Pengambilan contoh sample batubara bertujuan                         The purpose of sampling of coal is to analyze
    untuk dilakukan analisa kualitas batubara.                           the quality of the coal.

5.3. Pelaksanaan dan Pengawasan Kegiatan Eksplorasi                      5.3. Implementation and Supervision of
                                                                              Exploration Activities
    Kegiatan pengeboran BSL periode Q3 2025 pada                         Drilling activities of BSL for the period of Q3
    blok Belani dilakukan oleh tim eksplorasi dengan 1                   2025 at Block Belani were carried out by the
    unit rig di bawah supervisi Geologist Section                        drilling team with 1 rig under the supervision
    Geology dan Geotech, Departemen Mine Planing &                       of the Geologist Section Geology and
    Technical Service BSL.                                               Geotech, BSL's Mine Planning & Technical
                                                                         Service Department.
    Kegiatan pengeboran Q3 2025 dilakukan satu shift                     Drilling activities on Q3 2025 was conducted
    yaitu pagi dengan target kedalaman maksimal                          one shifts (day shift) with maximum depth
    meteran per lubang bor sebesar 90 meter, tentunya                    target per hole is 90 meter and with standard
    dengan memenuhi standar safety seperti adanya                        safety such as good lighting and other
    penerangan yang cukup dan kelengkapan standar                        equipment to support operational drilling
    lainnya.                                                             activity.
    Unit Rig yang digunakan pada kegiatan pengeboran                     Drilling activity used 1 unit of Jacro-200. Spec
    adalah tipe jacro-200, dengan spesifikasi diameter                   of rods pipe is 4 inch (96 mm) diameter drill
    lubang bor (outside) HQ 4 inch (Ǿ 96 mm). Selain                     holes (outside) HQ Rods type. Other than
    unit Rig Jacro juga terdapat unit SPT dengan palu.                   Jacro Rig unit, there is also an SPT unit with a
    Unit rig jacro-200 ini merupakan unit dengan                         hammer. This Jacro-200 rig unit is designed to
    spesifikasi target kedalaman pengeboran coring                       achieve a coring drill depth of up to 90
    hingga 90 meter dan ukuran yang cukup besar,                         meters, and due to its relatively large size,
    sehingga diperlukan unit alat berat (excavator atau                  heavy equipment (such as an excavator or
    Bulldozer) untuk melakukan perpindahan unit dari                     bulldozer) is required to move the unit from
    titik bor satu ke titik bor lainnya.                                 one drill point to another.
    Lubang bor yang telah selesai dilakukan                              Drill holes that have been finished then
    pengeboran kemudian dilakukan pickup collar                          carried out by a pickup collar survey by the
    survey oleh tim survey BSL yang terdiri dari 1                       BSL survey team consisting of 1 surveyor
    koordinator surveyor dan 2 crew survey.                              coordinator and 2 survey crews.
                                       PT. Golden Energy Mines Tbk.
              Sinar Mas Land Plaza Tower II, 6th Floor Jl. MH. Thamrin No. 51 Kav. 22, Jakarta Pusat 10350
                                  Phone: (62) 21 50186 888 , Fax: (62) 21 3199 0319
                                       Website: www.goldenenergymines.com
Page 6
5.4. Kemajuan Eksplorasi                                                    5.4. Drilling Progress
     Selama periode Q3 2025 kegiatan pengeboran                             in Q3 2025 exploration drilling activities in
     eksplorasi di Blok Belani Utara (Koridor) telah                        North Belani Block (Coridor) have completed
     menyelesaikan 3 lubang bor. Total kedalaman                            3 drill holes. Total drill hole Depth in Q3 2025
     lubang bor selama periode Q3 2025 adalah 125,46                        were 125.46 meters as detailed in table 1.3.
     meter rincian pada tabel 1.3.
     Pengeboran dilakukan dengan tipe pengeboran                            Drilling was carried out using the partial
     partiall coring dengan tujuan mendapatkan sample                       coring method with the aim of obtaining coal
     batubara dan sample batubara untuk dilakukan                           samples for quality analysis. Additionally, SPT
     analisa kualitas. Serta pengeboran SPT dilakukan                       drilling was performed to obtain values for
     untuk mendapatkan nilai propertis batuan.                              rock properties.



                        Tabel 1.3 Kemajuan Pengeboran Ekplorasi BSL Periode Q3 2025 /
                         BSL Drilling Exploration Progress for the period of Q3 2025

                                                          Lubang Eksplorasi (m) /
                                                             Exploration Drilling

    Lokasi /        Jumlah                               Total kedalaman (m) /
    Location        lubang /                             Total Depth
                                                                                                      Total (m)
                    Total                                Coring               Full Coring
                    Holes           Open Holes
                                                         (Infill)             (Geotech)
Belani              3              118,76                6,70                                         125,46




5.5. Biaya Eksplorasi                              5.5. Exploration Cost
     Untuk biaya eksplorasi selama periode Q3 2025      The exploration costs for the period of Q3
     adalah sebagai berikut :                           2025 are as follows :

                            Tabel 1.4. Biaya Pengeboran Eksplorasi BSL periode Q3 2025 /
                                      BSL Drilling Cost for the period of Q3 2025

                                                                                Year to Date
               Operating Expense
                                                     Anggaran / Plan (Rp)              Realisasi / Realisation (Rp)
  Biaya Pengeboran BSL / Drilling Cost BSL          Rp. 780.763.730,-              Rp. 624.740.721,-




                                          PT. Golden Energy Mines Tbk.
                 Sinar Mas Land Plaza Tower II, 6th Floor Jl. MH. Thamrin No. 51 Kav. 22, Jakarta Pusat 10350
                                     Phone: (62) 21 50186 888 , Fax: (62) 21 3199 0319
                                          Website: www.goldenenergymines.com

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Names mentioned 20 people and organisations named in the text · linked when the evidence is strong

linked org Golden Energy Mines Tbk p.1 ×23
linked org Sinar Mas p.1 ×6
linked org PT Borneo Indobara p.2
possible org PT Bursa Efek Indonesia p.1 ×3
unresolved person Vera Florida p.1
unresolved org Indonesia Stock Exchange p.1
unresolved org PT Golden Energy Mines Tbk Sudin p.1
unresolved person Sudin, SH · Corporate Secretary p.1
unresolved org PT Kuansing Inti Makmur p.2
unresolved org Departemen Survey p.3
unresolved org PT ICE p.3 ×2
unresolved org PT Surtech p.3
unresolved org PT Surtech Indonesia p.3
unresolved org Departemen SGE p.3
unresolved org Departemen Strategic p.3
unresolved org PT Trisula Kencana Sakti p.4
unresolved org PT Berkat Satria Abadi p.4
unresolved org PT Wahana Rimba Lestari p.4
unresolved org PT Barasentosa Lestari p.4
unresolved org Departemen Mine Planing p.5

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