Mineral Resources of the Maldives: Sand, Salt, and Seabed Potential

An Atoll Nation's Geological Reality

The **Maldives** (1,192 coral islands, 26 atolls) sits on the **Chagos-Laccadive Ridge**. Its geology is **carbonate platform** — essentially ancient reef. **No continental crust = no major metallic deposits on land.** Mineral inventory is limited but strategic.

1. Silica Sand (Beach & Offshore)

• High-purity (>95% SiO₂), well-rounded grains.
• Used: Glass, foundry, construction, water filtration, **proppant (fracking)** — *export potential*.
• Dredging impacts lagoon ecology — **strict EIA required.**

2. Limestone / Coral Aggregate (Ubiquitous)

• Types: Oolitic, Biogenic (coral/forams), Reef limestone.
• Uses: **Local construction** (blocks, aggregate, cement raw material), road base, reclamation fill.
• Constraint: Mining depletes island mass & reef protection. **Strictly regulated.**

3. Coral Rubble / Aggregate (Traditional & Current)

• Hand-collected or dredged. Concrete, seawalls, land reclamation (Hulhumalé).
• Phasing out for **imported aggregate / manufactured sand** to protect reefs.

4. Sea Salt (Solar Evaporation)

• Small-scale, artisanal. Lagoon ponds. **Food, tourism (spa), niche export.**
• Not industrial scale (land scarcity, energy cost).

5. Gypsum (Anhydrite) — Speculative

• Evaporite sequences *may* exist at depth in atoll lagoons/subsurface.
• **No commercial drilling/production.** Geological surveys inconclusive.

6. Seabed Minerals (The Real Frontier — EEZ)

• Polymetallic Nodules / Crusts: **Cu, Ni, Co, Mn, Rare Earths** on deep-sea mounts/ridges in EEZ (923,000 km²). **Exploration licenses granted (e.g., to UK Seabed Resources / China? — sensitive).**
• Hydrocarbons: **Potential** in sedimentary basins (offshore). **No commercial discovery.** Seismic surveys done. High risk/cost.
• Heavy Mineral Sands (Placers): **Ti (ilmenite/rutile), Zr, Monazite (REE), Garnet** — *theoretical* on paleo-beaches / submerged reefs. Unexplored.

7. The Environmental Imperative

• **Tourism (28% GDP) & Fisheries DEPEND on pristine reefs/lagoons.**
• **Climate Existential Threat:** Sea level rise (avg 1.5m elevation).
• **Any extraction = extreme scrutiny.** EIA, community consent, revenue sharing, rehabilitation bonds mandatory.
• **Moratoriums** on coral/sand mining in many atolls.

The Maldives' true "mineral" is **its reef ecosystem**. Sustainable yield > extraction.