G.R. No. 220828 , October 07, 2020
Republic of the Philippines, represented by the Philippine Mining Development Corporation, Petitioner, vs. Apex Mining Company Inc., Respondent.

FACTS

The Philippine Mining Development Corporation (PMDC), representing the Republic, is the successor-in-interest to the mining rights of North Davao Mining Corporation (NDMC). NDMC held various mining lease contracts and published lode lease applications in Compostela Valley. After NDMC defaulted on loans, its assets, including mining claims, were foreclosed by the Philippine National Bank and later transferred to the government via the Asset Privatization Trust (APT). Meanwhile, in 1995, respondent Apex Mining Company Inc. filed applications for a Mineral Production Sharing Agreement (MPSA) over areas in Compostela Valley. In 1996, NDMC (through APT) filed an application for a Financial or Technical Assistance Agreement (FTAA), which overlapped with Apex’s MPSA applications.
Apex filed an adverse claim/protest against NDMC’s FTAA application before the Panel of Arbitrators (POA), arguing NDMC’s underlying mining claims were null and void for non-compliance with mining laws. The POA ruled in favor of Apex, declaring NDMC’s claims invalid and dismissing its FTAA application. This decision was affirmed by the Mines Adjudication Board (MAB). PMDC appealed to the Court of Appeals (CA), which reversed the MAB and upheld the validity of NDMC’s claims, granting it prior and preferential rights.

ISSUE

Whether the Court of Appeals erred in reversing the MAB and recognizing the validity of NDMC’s (now PMDC’s) mining claims, thereby granting it prior and preferential rights over the contested areas.

RULING

The Supreme Court reversed the Court of Appeals and reinstated the MAB decision. The Court held that for mining claims to be considered “valid and existing” under Department Administrative Order (DAO) No. 97-07, which implements the Philippine Mining Act of 1995, they must have complied with specific mandatory requirements under the old mining laws. These requirements include the timely filing of a Declaration of Location, an Application for Survey, and an Application for Mining Lease.
The legal logic is grounded in the principle that rights under the old mining regime are not automatically preserved; they must be perfected by complying with statutory prerequisites. The Court found that NDMC failed to substantiate its claims with evidence of such compliance. Its claims remained mere lease applications that were never converted into perfected mining leases. Consequently, when the new mining law took effect, these unperfected claims could not be considered “valid and existing” under the transitional rules. Therefore, NDMC (and its successor PMDC) could not assert prior rights over the area. In contrast, Apex’s MPSA applications, filed under the new law, could proceed over areas free from valid existing claims. The CA’s reliance on the government’s act of holding the claims in trust was erroneous, as the state’s custodianship does not cure the claims’ inherent invalidity or confer vested rights absent legal compliance.