Raymond’s Geology Blog
May 18, 2026

Geology and Mineral Resources – The Philippines

Introduction

Figure 1 – The Philippines
Credit: Mapsland, Creative Commons Attribution-Share Alike 3.0 Licence

The Republic of the Philippines is a country of 111,349,016 people on about 7,641 islands in Southeast Asia. The country has an area of approximately 300,000 square kilometres. Connected to the Pacific Ocean, the seas surrounding the Philippines are: the South China Sea, to the west; the Philippine Sea, to the east; and the Celebes Sea, to the south. Nearby countries across those seas are: Taiwan, to the north; Japan, to the northeast; Palau, to the east/southeast; Indonesia, to the south; Malaysia, to the southwest; Vietnam, to the west; and China, to the northwest.

The Philippines is a modestly prosperous country with a per capita GDP (PPP) of $13,639 and a high Human Development Index of 0.720. The Philippine economy is a service-oriented economy, with an expanding manufacturing sector and an important agriculture sector, feeding those 111 million people.

The top exports of the Philippines in February 2026 were integrated circuits, small general trade shipments, insulated wire, coconut oil, and electrical transformers. The main destinations for exports were: the United States, Hong Kong, Japan, China, and the Netherlands. The main imports were integrated circuits, refined petroleum, small general trade shipments, cars, and crude petroleum. The main countries of origin for imports to the Philippines were China, South Korea, Japan, Indonesia, and the United States.

For more details on the country, check out the Wikipedia and Grokipedia articles on the country.

Geology

Figure 2 – Tectonic Geology of the Philippines
Credit: Figure 1 in Queaño et al, 2020, CC BY 4.0

The geology of the Philippines is a consequence of ongoing tectonic activity. This orogeny pushed together the Pacific Plate, the Eurasian Plate, the Indo-Australian Plate, and the Philippine Sea Plate. Attached to the Indo-Australian Plate are two smaller plates: the Sunda Plate, and the Palawan Microcontinental Block. At the junction of the Sunda Plate, Palawan Microcontinental Block, and the Philippine Sea Plate is the Philippine Mobile Belt.

The Philippine Mobile Belt is is surrounded by complex plate boundaries including various subduction zones including: the East Luzon Trough, to the northeast; the Philippines Trench, to the east; the Cotabato Trench, the Sulu Trench, and the Negros Trench, to the southwest; and the Manila Trench, to the northwest. Running down the middle of the Philippine Mobile Belt is a complex of faults generally called the Philippine Fault.

The geologic history of the Philippines began during the Cretaceous Period. The geological and tectonic processes that made the modern Philippines include: subduction related volcanism, strike slip faulting, continent-arc collision, and ophiolite accretion. Significant events in the evolution of the Philippines include:

The lithology of the Philippines includes Cretaceous or older metamorphic rocks. Associated with these Cretaceous aged metamorphic deposits are ophiolites including: the Isabela Ophiolite, Casiguran Ophiolite Belt; Zambales Ophiolite Belt; Angat Ophiolite Belt; Eastern Bicol–Eastern Mindanao Ophiolite Belt; Antique Ophiolite Belt; Western Bicol–Eastern Leyte Ophiolite Belt; Palawan Ophiolite Belt; Zamboanga–Sulu Ophiolite Belt; and Central Mindanao Ophiolite Belt.

Volcanic rocks in the Philippines are common and are found in: magmatic arcs, ancient arc deposits, and active volcanic arcs.

The Philippines also has numerous sedimentary basins ranging in age from Jurassic to Quaternary. These include: the Ilocos - Central Luzon Basin; the Cagayan Valley Basin; the Southern Luzon - Bicol Basin; the Mindoro Basin; the Iloilo Basin; the Visayan Sea Basin; the Samar Basin; the Agusan-Davao Basin; and the Cotabato Basin.

This, of course, only scratches the surface of the complex geology of the the Philippines. If you want to dig into it deeper, follow up on the links above. Two good documents are:

Figure 3, below, links to an interactive geological map of the Philippines, from Macrostrat.

Figure 3 – Interactive Geological Map of the Philippines
Credit: Macrostrat, CC BY 4.0

Paleontology

Figure 4 – Fossil Sites in the Philippines
Credit: Copyright © 2026 Nannoworks Laboratory

The Nannoworks Laboratory of the National Institute of Geological Sciences, University of the Philippines Diliman has published an interactive map showing the locations sedimentary basins with fossils found in the Philippines (see Figure 4, above). Let’s look at a few examples of these fossil finds.

Stegodon sp.

Figure 5 - Stegodon at the Davao City Museum
Credit: MadayawDavao, Creative Commons Attribution-Share Alike 4.0 International license

An extinct genus of proboscidean (elephant), Stegodon lived in the Philippines during the Pliocene Period and into the Pleistocene Epoch of the Quaternary Period. The Stegodon specimens found in the Philippines were pygmy specimens, typical of island dwarfism.

A student, Cheerie T. Magalit, is credited with first finding a Stegodonfossil at the Tres Hermanas Quarry, in tuffs of the Laguna Formation (Pliocene-Pleistocene), near Antipolo, Rizal. This discovery is further described in the paper by W. U. Schoell, A. Peleo-Alampay, and P. J. Militante-Matias, July 1987, Stegodon fossil remains from the Plio/Pleistocene, Laguna Formation, Antipolo, Rizal, Natural and Applied Science Bulletin 39(3):217-236 (1987), https://www.researchgate.net/publication/339102605_Stegodon_fossil_remains_from_the_Plio-Peistocene_Laguna_Formation_Antipolo_Rizal

Figure 6 shows the location of the Tres Hermanas Quarry, it’s just outside Manila.

Figure 6 - Tres Hermanas Quarry Location
Credit: Figure 1 in Karl & Staesche, 2014

Manouria

Figure 7 – ManouriaCredit: Biodiversity Heritage Library, public domain

Island isolation can also make giants of smaller creatures. This was the case with Manouria, a common brown land tortoise still found today in Southeast Asia. During the Pleistocene, however, one species of Manouria, Manouria sondaari, grew to be a giant land tortoise. Fossils of Manouria sondaari were found in the Tres Hermanas Quarry by Hans-Volker Karl and Ulrich Staesche in 2007. This was documented in the paper: Karl, Hans-Volker & Staesche, Ulrich. (2014). Fossile Riesen-Landschildkröten von den Philippinen und ihre paläogeographische Bedeutung [Fossil Giant Land Tortoises from the Philippines and their palaeogeographic importance]. Geologisches Jahrbuch. B. 171-197, https://www.researchgate.net/publication/260382701_Fossile_Riesen-Landschildkroten_von_den_Philippinen_und_ihre_palaogeographische_Bedeutung_Fossil_Giant_Land_Tortoises_from_the_Philippines_and_their_palaeogeographic_importance

Homo luzonensis

Figure 8 - Homo luzonensis restoration
Credit: Luzonensis, Creative Commons Attribution-Share Alike 4.0 International license

The phenomena of island dwarfism is not confined to elephants, a population of archaic humans were stranded on Luzon during the Late Pleistocene and became smaller over time. Bones of these people were first found in 2007 by archaeologist Philip Piper. In 2019, a group of archaeologists, lead by Armand Mijares and Florent Détroit, published a paper naming the new human species Homo luzonensis based on bones found in Callao Cave. It is very likely that Homo luzonensis hunted the giant tortoises and dwarf elephants also found on Luzon during the Pleistocene.

Taramelliceras

Figure 9 – Taramelliceras
Credit: Ghedoghedo, Creative Commons Attribution-Share Alike 4.0 International license

Found in the Jurassic aged Mansalay Formation in Southern Mindoro, Taramelliceras was a marine cephalopod, an ammonite.

The Taramelliceras find was documented in: D. R. Andal, J. S. Esguerra, W. Hashimoto, B. P. Reyes and T. Sato, 1968, The Jurassic Mansalay Formation, Southern Mindoro, Philippines, Contributions To The Geology And Palaeontology Of Southeast Asia, L., Geology And Palaeontology Of Southeast Asia Vol. IV, pp. 179-197, Pis. XXVIII-XXX, February 25, 1968, http://jurassic.ru/pdf/Andal%20et%20al.,1968_Amm_Philippines.pdf

Mineral Resources

Figure 10 - Gold & Quartz from the Benguet Province, Philippines
Credit: James St. John, Creative Commons Attribution 2.0 Generic license

According to the USGS Minerals Yearbook on the Philippines, the country has a broad based mineral industry. In 2022, the Philippines was the second-ranked producer of nickel and it was the fifth-ranked producer of cobalt. The most current statistics on mineral production from the USGS are here.

Metallic Minerals
Industrial Minerals

  • For construction materials, the Philippines produces cement, clay, lime, pozzolan, dimension stone, crushed stone, sand and gravel.

  • Other industrial minerals include: feldspar, perlite, phosphate rock, sea salt, and zeolites.

Mineral Fuels and Related Materials

Figure 11 links to a interactive mineral occurrence map from Mindat.

Figure 11 - Interactive mineral occurrence map, Philippines
Credit: Mindat.org

Summary

Figure 12 - Sunset Agta Beach Resort – Biliran
Credit: Leodb, Creative Commons Attribution-Share Alike 3.0 Unported license

I have to admit my strong positive bias about the Philippines since my daughter-in-law came from there and she has told me many good things about the place. Also, my daughter visited the Philippines a couple of years ago and also had positive reviews of it. I have met many fine people from that country.

However, the country is not without its problems as in this recent news item:

Internally, the Philippines has struggled with generating enough economic growth to gainfully employ its many well educated people. That is one reason I have had the opportunity to meet people from the Philippines in my own country, many Filipinos and Filipinas have moved to Canada for better economic opportunities. Like many countries, the Philippines also struggles with political corruption – a serious drag on economic growth and a constant annoyance to ordinary people.

The Philippines also has serious geopolitical issues, especially with their neighbour China in the South China Sea. There are regular incidents between Chinese and Philippine maritime forces in the disputed areas of the sea. Besides the usual issues of national pride, there are potential oil and gas deposits under the South China Sea (see Figure 13, below) and China is anxious to secure access to the resources. The Philippines is also pursuing new energy deposits, especially offshore of Palawan. There is a possibility that current difficulties will encourage peaceful cooperation on the matter. I don’t think that we can rule out anything at this point.

Figure 13 - South China Sea Energy Exploration and Development
Credit: ©2026 Center for Strategic & International Studies

In addition to possible petroleum development, a potential that has been known for a long time, the Philippines also has a good chance to get in on the current boom in rare earth minerals. While well developed, there may also be potential for new development in both precious and base metals. The current high demand for copper could spur exploration for that commodity in the Philippines. Developing their mineral resources in a responsible manner is another challenge for the Filipinos.

Overall, I am optimistic for the people of the Philippines. There are still great opportunities for natural resource and other economic development. More importantly, they have good people, and that counts for a lot.

Standard Caveat

J. Robert Oppenheimer on freedom and scientific inquiry

The purpose of my weblog postings is to spark people's curiosity in geology. Don't entirely believe me until you've done your own research and checked the evidence. If I have sparked your curiosity in the subject of this posting, follow up with some of the links provided here. If you want to, go out into the field and examine some rocks on your own with the help of a good field guide. Follow the evidence and make up your own mind.

In science, the only authority is the evidence.