Delta Dunia

What Delta Dunia does

Delta Dunia, now operating as BUMA International Group following a shareholder-approved rebrand in March 2025, is a publicly listed (IDX: DOID) Indonesian holding company specializing in coal mining contracting services. The group is built around two core operating subsidiaries: BUMA (established 1998, holding 15% market share among independent coal mining contractors in Indonesia) and BUMA Australia (established 2021 through the acquisition of Downer's Open Cut Mining, whose operations trace back to 1922). Together these subsidiaries deliver extraction, equipment, and operational management services to major and emerging coal mining companies under long-term enterprise contracts; the Adaro contract for the Tutupan Selatan mine runs through 2030.

The group's revenue model is B2B professional services, generating income through long-term, quote-based mining contracts tailored to individual mine operations rather than standardized pricing. Two adjacent subsidiaries complete the portfolio: BTech, which develops technology solutions and financing structures for mining field operations, and BIRU, a social-development unit focused on education, skills training, waste management, and recycling aligned with a low-carbon circular economy agenda. In June 2024, the group also acquired Atlantic Carbon Group, a carbon black producer, as a vertical diversification move beyond pure coal contracting.

Delta Dunia / BUMA International Group is headquartered in South Quarter Tower C, Jakarta Selatan, and operates across Indonesia and Australia with 10,000+ employees. Disclosed financials show FY2025 revenue of approximately $1.48 billion, down from ~$1.83 billion in FY2023, with FY2025 EBITDA of ~$132 million and a net loss of ~$116 million. The company itself characterized FY2025 as a "challenging year with recovery continuing throughout the year," and reported a YoY EBITDA increase in Q1 2026.

Name

Delta Dunia

Legal name

PT BUMA Internasional Grup Tbk

Website

https://deltadunia.com

Company type

Public

Founded year

1998

Operating status

Operating

Headcount range

5,001–10,000 employees

Ownership category

akta.pro rank

Product category

Coal Mining Contracting Services

NAICS

Support Activities for Mining (2131)

SIC

Bituminous Coal & Lignite Surface Mining (1221), Bituminous Coal & Lignite Mining (1220)

akta.pro primary industry

Mine Operations Contracting (Open-Pit & Underground Development, Production, Load/Haul) (IMAKAKAD)

Keywords

• Coal mining contracting
• Open-cut mining services
• Mining equipment operations
• Resource extraction services
• Mining technology solutions

Headquarters

HQ city

Jakarta

HQ country

Indonesia

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Operations, Personnel, Supply Chain, Infrastructure, Technology or R&D

Revenue model

1. Mining Contracting Services: Provides coal mining contracting services through BUMA (Indonesia, established 1998) and BUMA Australia (acquired 2021). Revenue generated from long-term service contracts with coal mining companies, offering extraction, equipment, and operational services.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Delta Dunia (BUMA International Group) provides coal mining contracting services to coal mining companies in Indonesia and Australia, operating through subsidiaries BUMA and BUMA Australia. The company delivers mine extraction, equipment, and operational management services under long-term contracts, complemented by BTech mining technology solutions and BIRU social development programs. Revenue is generated primarily from professional mining contracting services rather than commodity sales.

Product overview

BUMA International Group (formerly Delta Dunia Group) operates as a diversified holding company with a portfolio of mining-related businesses. The core operations comprise two leading mining service providers: BUMA (established 1998, 15% Indonesia market share) and BUMA Australia (established 2021 via acquisition of Downer's Open Cut Mining from 1922). These are complemented by BTech, which provides technology solutions and financing for mining operations, and BIRU, which focuses on social responsibility, education, skills training, waste management, and circular economy initiatives. The group delivers high-quality coal to major companies while empowering local communities and implementing responsible mining practices.

Differentiator

Problem solved

Functional benefit

Brands

• BUMA: Coal mining contractor established in 1998, the leading independent coal mining contractor in Indonesia with 15% market share.
• BUMA Australia
• BTech
• BIRU

Products and services

• BUMA Coal Mining Contracting (Indonesia) Coal mining contracting services for major and emerging coal mining companies in Indonesia. Provides extraction, equipment provision, and operational management as a leading independent coal mining contractor with 15% market share. Established in 1998.
• BUMA Australia Open-Cut Mining Contracting Open-cut mining contracting services in Australia, established in 2021 through the acquisition of Downer's Open Cut Mining operations (in continuous operation since 1922). Serves coal mining companies in the Australian market.
• BTech Mining Technology Solutions Innovative high-performance technology solutions and financing services for mining companies, focused on technology development and effective and efficient field operations financing.
• BIRU Social Development Program Social development programs covering education, skills training, waste management, and recycling, aimed at creating a low-carbon and circular economy around mining operations.

Quantifiable outcome

• 1Q26 EBITDA increased YoY despite seasonal highest rainfall quarter

Named customers2 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

One partnership is on record.

• AdarocoreStrategic or Co-development Partner · 23 February 2026BUMA secured a long-term contract with Adaro for the Tutupan Selatan mine extending until 2030. This represents a major strategic contract win ensuring sustained revenue and operational scope for the company's primary business unit.

Scale indicators4 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Macmahon Holdings: Australian open-cut mining contractor providing similar drilling, blasting, loading, and hauling services to coal and metallurgical mining customers. Comparable to BUMA Australia given overlapping service offerings and geographic exposure.
• Downer EDI: From whom BUMA International Group acquired Downer's Open Cut Mining operations in 2021. Continued Australian mining services presence makes it a direct comparable and former parent of BUMA Australia's operating assets.
• NRW Holdings: Diversified Australian mining contractor with significant coal exposure across surface mining operations. Comparable to BUMA in service scope, project structure, and customer type.
• PT Bukit Makmur Mandiri Utama (BMM): Indonesian independent coal mining contractor and direct competitor to BUMA in the Indonesian thermal coal market. A natural comparable given similar business model, customer base, and geography.
• Thiess: One of the world's largest mining contractors, operating extensively in coal and metallurgical coal in Australia and Indonesia. Directly comparable to BUMA as a large-scale open-cut coal mining contractor serving the same customer base in overlapping geographies.

Others

• Caterpillar: Global mining equipment manufacturer that supplies BUMA and the broader mining contractor industry. Indirectly comparable as a key input supplier whose pricing and equipment availability affect contractor margins.

Broad incumbents

• Harum Energy: Indonesian integrated coal mining and logistics company with thermal and metallurgical coal exposure. Comparable as another major Indonesian coal player with similar geographic and operational footprint.
• Adaro Energy: Indonesia's largest thermal coal producer and BUMA's flagship customer. Comparable as a major Indonesian coal player with integrated mining operations, though operates as a producer rather than contractor.
• Bukit Asam (PTBA): Indonesian state-owned coal miner producing thermal and coking coal. Comparable to BUMA's customer profile and provides demand-side context for Indonesian coal mining contracting activity.
• Bayan Resources: Major Indonesian thermal coal producer with significant captive mining operations. Comparable to BUMA's customer base and operates in the same Indonesian coal ecosystem, providing context for contractor demand dynamics.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/pt-bukit-makmur-mandiri-utama
• Xx.com/bumaofficial

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A1 record

Investments1 record

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Delta Dunia