Financial Results Presentation

Cash Costs BUMA's cash cost ex fuel (1Q 2022) Rental 6% Lubricants 3% Tires 5% Drilling & blasting. 4% Overhead & office _ 10% Others 10% Delta Dunia Spare parts & maintenance 30% Employee compensation 33% ▸ The management team led the business to navigate through the prolonged downturn in 2020, focusing on optimizing asset utilization, strategically reducing capex, efficient inventory management and prudently reducing costs ►1Q 2022 costs have included BUMA Australia, which has employee compensation as their biggest cost component vs BUMA Indonesia having spare parts & maintenance. ➤ 1Q 2022 still includes upfront costs in order to facilitate growth efforts, unusually high-rainfall condition in the quarter causing higher costs. Benefits of those upfront costs start to be visible this year and when volume have fully ramped-up. ▸ Technology driven initiatives continued to be pursued and are expected to reduce costs sustainably going forward - STRICTLY CONFIDENTIAL - 33

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