Estimates and assumptions continued ii Estimasi cadangan lanjutan

PT PERTAMINA PERSERO DAN ENTITAS ANAKNYA CATATAN ATAS LAPORAN KEUANGAN KONSOLIDASIAN Tanggal 31 Desember 2015 dan untuk Tahun yang Berakhir pada Tanggal Tersebut Dinyatakan dalam ribuan Dolar Amerika Serikat, kecuali dinyatakan lain PT PERTAMINA PERSERO AND ITS SUBSIDIARIES NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS As of December 31, 2015 and for the Year Then Ended Expressed in thousands of US Dollars, unless otherwise stated 76

4. AKUISISI DAN PENAMBAHAN PARTICIPATING INTEREST lanjutan

4. ACQUISITION AND

ADDITION OF PARTICIPATING INTEREST continued g. Penambahan 29.5 participating interest PHE Nunukan Company di Blok Nunukan g. Addition of PHE Nunukan Company 29.5 participating interest in the Nunukan Block Berdasarkan Surat Dirjen Migas tanggal 18 Agustus 2015 No. 1045613DJM.E2015 Pemerintah menyetujui pengalihan participating interest dari PT Medco EP Nunukan kepada PHE Nunukan Company sebesar 29.5 dan Videocon Indonesia Nunukan Inc. sebesar 10.5, sehingga komposisi participating interest di Wilayah Kerja Nunukan menjadi : PHE Nunukan Company 64.5, BPRL Ventures Indonesia B.V. 12.5 dan Videocon Indonesia Nunukan Inc. 23. Based on the Directorate General of Oil and Gas letter No. 1045613DJM.E2015 dated August 18, 2015, The Government approved the transfer of participating interest of PT Medco EP Nunukan to PHE Nunukan Company of 29.5 and Videocon Indonesia Nunukan Inc. of 10.5. The composition of the participating interest in the Nunukan Block: PHE Nunukan Company 64.5, BPRL Ventures Indonesia B.V. 12.5 and Videocon Indonesia Nunukan Inc.23. h. Akuisisi participating interest di Blok Abar h. Acquisition of participating interest in Abar Block Berdasarkan Surat Direktorat Jenderal Migas tanggal 18 Maret 2015, Pemerintah menunjuk Pertamina sebagai pengelola Blok Abar. Pada tanggal 22 Mei 2015, PT PHE Abar dan SKK Migas menandatangani KKS atas Blok Abar untuk jangka waktu kontrak 30 tahun. Based on the Directorate General of Oil and Gas Letter dated March 18, 2015, The Government appointed Pertamina as the operator of Abar Block. On May 22, 2015, PT PHE Abar and SKK Migas signed PSC for Abar Block for a period of 30 years.

i. Akuisisi participating interest di Blok

Anggursi i. Acquisition of participating interest in Anggursi Block Berdasarkan Surat Direktorat Jenderal Migas tanggal 18 Maret 2015, Pemerintah menunjuk Pertamina sebagai pengelola Blok Anggursi. Pada tanggal 22 Mei 2015, PT PHE Anggursi dan SKK Migas menandatangani KKS atas Blok Anggursi untuk jangka waktu kontrak 30 tahun. Based on the Directorate General of Oil and Gas letter dated March 18, 2015, The Government appointed Pertamina as the operator of Anggursi Block. On May 22, 2015, PT PHE Anggursi and SKK Migas signed PSC for Anggursi Block for a period of 30 years.

j. Akuisisi participating interest di Blok MNK

Sakakemang

j. Acquisition of participating interest in MNK

Sakakemang Block Berdasarkan Surat Direktorat Jenderal Migas tanggal 18 Maret 2015, Pemerintah menunjuk Pertamina sebagai pemegang 50 Participating Interest Blok MNK Sakakemang Sumatera Selatan. Participating interest lainnya di KKS Blok MNK Sakakemang dimiliki oleh Bukit Energy Indonesia Pte, Ltd. 50. Pada tanggal 22 Mei 2015, PT PHE MNK Sakakemang, Bukit Energy Indonesia Pte, Ltd dan SKK Migas menandatangani KKS atas Blok MNK Sakakemang untuk jangka waktu kontrak 30 tahun. Based on the Directorate General of Oil and Gas Letter dated March 18, 2015, The Government appointed Pertamina as the holder of 50 Participating Interest in MNK Sakakemang Sumatera Selatan Block. The remaining participating interest in MNK Sakakemang Block PSC were held by Bukit Energy Indonesia Pte, Ltd. 50. On May 22, 2015, PT PHE MNK Sakakemang, Bukit Energy Indonesia Pte, Ltd. and SKK Migas signed PSC for MNK Sakakemang Block for a period of 30 years. PT PERTAMINA PERSERO DAN ENTITAS ANAKNYA CATATAN ATAS LAPORAN KEUANGAN KONSOLIDASIAN Tanggal 31 Desember 2015 dan untuk Tahun yang Berakhir pada Tanggal Tersebut Dinyatakan dalam ribuan Dolar Amerika Serikat, kecuali dinyatakan lain PT PERTAMINA PERSERO AND ITS SUBSIDIARIES NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS As of December 31, 2015 and for the Year Then Ended Expressed in thousands of US Dollars, unless otherwise stated 77

4. AKUISISI DAN PENAMBAHAN PARTICIPATING INTEREST lanjutan

4. ACQUISITION AND

ADDITION OF PARTICIPATING INTEREST continued k. Akuisisi participating interest Murphy Sabah Oil Co. Ltd. dan Murphy Sarawak Oil Co. Ltd.

k. Acquisition of participating interest of Murphy Sabah Oil Co. Ltd. and Murphy

Sarawak Oil Co. Ltd. Efektif sejak tanggal 18 Desember 2014, PT Pertamina Malaysia Eksplorasi Produksi “PMEP” mengakuisisi 20 hak kepemilikan Murphy Sabah Oil Co. Ltd. untuk Blok K, Blok P dan Blok H dan Murphy Sarawak Oil Co. Ltd. untuk Blok SK-309, Blok SK-311 dan Blok SK-314A dengan nilai US1.360.974. Akuisisi atas hak kepemilikan ini dicatat sebagai investasi pada blok minyak dan gas Catatan 12.i. Effective since December 18, 2014, PT Pertamina Malaysia Eksplorasi Produksi “PMEP” acquired 20 of participating interest of Murphy Sabah Oil Co. Ltd. for Block K, Blok P and Block H and Murphy Sarawak Oil Co. Ltd. for Block SK-309, Block SK-311 and Block SK- 314A amounting to US1,360,974. Acquisition of this participating interest was recorded as investment in oil and gas block Note 12.i. Pada tanggal 29 Januari 2015, PMEP mengakuisisi 10 tambahan hak kepemilikan Murphy Sabah Oil Co. Ltd. untuk Blok K, Blok P dan Blok H dan Murphy Sarawak Oil Co. Ltd. untuk Blok SK-309, Blok SK-311 dan Blok SK-314A dengan nilai US517.944. Atas tambahan hak kepemilikan tersebut, maka total akuisisi PMEP terhadap Hak kepemilikian Murphy Sabah Oil. Co. Ltd. dan Murphy Sarawak Oil. Co. Ltd. menjadi 30. On January 29, 2015, PMEP acquired additional 10 of participating interest of Murphy Sabah Oil Co. Ltd. for Block K, Blok P and Block H and Murphy Sarawak Oil Co. Ltd. for Block SK-309, Block SK-311 and Block SK314A amounting to US517,944. After the additional interest, total PMEP acquisition of participating interest in Murphy Sabah Oil. Co. Ltd. and Murphy Sarawak Oil. Co. Ltd. become 30.

l. Akuisisi

tambahan 15 participating interest Eni East Sepinggan Ltd.

l. Additional acquisition 15 participating

interest Eni East Sepinggan Ltd. Efektif sejak tanggal 16 Januari 2015, PT PHE East Sepinggan mengakuisisi participating interest sebesar 15 di KKS Blok East Sepinggan seharga US10.523. Participating interest lainnya di KKS Blok East Sepinggan dimiliki oleh Eni East Sepinggan Ltd. 85. Effective since January 16, 2015, PT PHE East Sepinggan acquired 15 participating interest in East Sepinggan Block PSC for US10,523. The remaining participating interest in East Sepinggan Block PSC were held by Eni East Sepinggan Ltd. 85.

m. Penambahan 7,483068

participating interest PT PHE OSES di Blok Offshore Southeast Sumatera

m. Addition of PT PHE OSES’s 7.483068 participating interest in Offshore Southeast

Sumatera Block Efektif sejak tanggal 24 Oktober 2014, PT PHE OSES mengakuisisi tambahan participating interest sebesar 7,483068 dari kontraktor lain seharga US52.619. Akuisisi ini meningkatkan kepemilikan participating interest PT PHE OSES di Blok Offshore Southeast Sumatera menjadi 20,550512. Effective since October 24, 2014, PT PHE OSES acquired an additional 7.483068 participating interest from other contracting partners for US52,619. The acquisition increased PT PHE OSES’s participating interest in Offshore Southeast Sumatera Block to 20.550512. n. Perolehan participating interest di Blok Siak n. Acquisition of participating interest in Siak Block Berdasarkan Surat Menteri Energi dan Sumber Daya Mineral tanggal 26 November 2013, SKK Migas menunjuk Perusahaan sebagai pengelola baru Blok Siak sehubungan dengan berakhirnya KKS Siak tanggal 27 November 2013. Pada tanggal 26 Mei 2014, PHE Siak dan SKK Migas menandatangani KKS untuk wilayah kerja Blok Siak untuk jangka waktu kontrak 20 tahun sampai dengan 25 Mei 2034. Based on the Ministry of Energy and Mineral Resources letter dated November 26, 2013, SKK Migas appointed the Company as the new operator of Siak Block following the expiration Siak PSC on November 27, 2013. On May 26, 2014, PHE Siak and SKK Migas have signed PSC for Siak PSC Block for a period of 20 years i.e. until May 25, 2034.