Due diligence comes first in mining concessions

10 July 2026

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Mining projects require substantial upfront capital commitments and face long gestation periods before generating returns. For foreign investors, the commercial viability of these ventures depends less on resource abundance and more on the durability and legal integrity of the underlying mining rights. The critical question is whether a concession can withstand rigorous regulatory and judicial scrutiny years after capital deployment.

The landmark Supreme Court decision in Republic v Rosemoor Mining and Development Corporation (30 March 2004) is a case study on the boundaries of state power, the nature of mining licences and the absolute necessity of rigorous legal due diligence.

Rosemoor case: Illegal quarry permit

Enrique V. Dela Cruz Jr — **Enrique Dela Cruz Jr**
Consultant
DivinaLaw
Metro Manila

In Rosemoor, the permit holder invested heavily in developing a marble quarry in Bulacan under a quarry licence permit, covering 330 hectares. The Department of Environment and Natural Resources cancelled the permit because it violated section 69 of Presidential Decree (PD) No. 463, which limits licences to a maximum of 100 hectares per province.

The investor argued the 330-hectare area was valid because it was backed by four separate applications filed by its individual stockholders, averaging roughly 81 hectares each. While the lower courts initially agreed – ruling that the permit had ripened into a vested property right protected by due process and non-impairment clauses – the Supreme Court reversed the rulings entirely.

Three doctrines in risk management

Ciselie Marie T. Gamo-Sisayan — **Ciselie Marie Gamo-Sisayan**
Partner
DivinaLaw
Metro Manila

Foreign consortiums and investors must align their risk-management frameworks with three primary conclusions established by the Supreme Court.

A licence is a privilege, not a vested property right. The court dismantled the argument that long-term capital deployment converts a state-issued mining permit into an immutable private property right. “A mining licence that contravenes a mandatory provision of the law under which it is granted is void. Being a mere privilege, a licence does not vest absolute rights in the holder. Thus, without offending due process and the non-impairment clauses of the Constitution, it can be revoked by the state in the public interest,” it ruled. Because using natural resources is “impressed with great public interest”, licences do not vest permanent rights. Under its police power, the state retains the authority to amend, modify or rescind these privileges to promote general welfare.

Regulatory subterfuge defeats the permit. The court rejected the investor’s attempt to bypass the 100-hectare statutory cap by stacking multiple applications under one corporate entity. Emphasising the strict interpretation of statutory limitations and the separate legal identity of a corporation, the court noted the clear and mandatory language in PD No. 463 cannot be circumvented by filing several applications. Any structured vehicle designed to bend clear statutory limits – even if initially tolerated by regulators – is void ab initio (invalid from the beginning) and subject to immediate cancellation.

Regulatory reforms protect valid rights, not defective ones. While the 1987 Constitution shifted the framework away from the old licensing system towards “full control and supervision” via mineral agreements, these reforms operate prospectively. The Philippine Mining Act of 1995, also known as Republic Act (RA) No. 7942, protects valid, pre-existing mining rights. Subsequent laws cannot retroactively cure a permit that was illegal at its inception.

Flawless mining title due diligence

Kristina Mae C. Durana — **Kristina Mae Durana**
Senior Associate
DivinaLaw
Metro Manila

The survival of a mining asset depends entirely on the absolute flawlessness of its initial legal acquisition. When auditing potential acquisitions or partnering with local claimholders, international investors must look past physical possession and thoroughly verify:

1. Strict statutory compliance. Does the concession’s footprint exceed provincial or national acreage caps under the agreement?
2. Corporate separateness. Are local joint venture structures transparently arranged or do they rely on stacked applications that could be interpreted as a circumvention of the law?
3. Negative list verifications. Is the permit area clear of areas closed to mining under section 19 of RA No. 7942, such as old-growth forests, proclaimed watersheds or military reservations?

Valid title survives, defects fail

Where the original grant of a mining right is legally flawless, Philippine jurisprudence shields the asset from regulatory changes. But where the foundation is legally defective, no amount of deployed capital or physical infrastructure will suffice to preserve the project. Before allocating millions to long-term extraction projects, investors must ascertain whether their regulatory titles are built on bedrock or sand.

Enrique V Dela Cruz Jr is a consultant, Ciselie Marie T Gamo-Sisayan  is a partner and Kristina Mae C  Durana  is a senior associate at DivinaLaw  in Metro Manila