Revision summary
Beaches and dunes are storm buffers, freshwater lenses, and nest sites. Mining, licensed or not, causes erosion, salinity, and fishery decline. Kollam–Alappad, Tamil Nadu mineral coasts, Odisha turtle beaches and Konkan dunes are cited cases. Monazite belts add a radioactive-tailings risk. CRZ, sand-mining guidelines and inland manufactured sand are the way forward.
Model answer
Introduction
Coastal sand is not an inert pile. It is the beach–dune–bar system that absorbs waves, stores freshwater, and hosts nests and fisheries. Legal leases for construction sand or placer minerals (ilmenite, garnet, rutile, monazite) and illegal night mining both strip that buffer. The Coastal Regulation Zone notifications and Sustainable Sand Mining Management Guidelines (2016) try to draw a line; the shoreline still recedes where the line is ignored.
Body
Impacts
- Erosion and storm surge: removing sand starves downdrift beaches. After the 2004 tsunami, Kerala’s Chellanam and parts of Puducherry–Tamil Nadu showed how a thin beach lets waves hit homes. Mining makes that thinning faster.
- Saline intrusion: dunes and sand bars hold a freshwater lens. When they are cut, wells in coastal panchayats turn brackish, which hits drinking water and coconut/paddy.
- Biodiversity: Olive Ridley mass nesting at Gahirmatha, Rushikulya and Devi (Odisha) needs a dark, sloped beach. Lights, pits and vehicle tracks from mining destroy nests. Leatherback and olive ridley stretches of Tamil Nadu–Kerala, and turtle beaches of Goa and the Andamans, face the same logic.
- Fisheries and livelihoods: surf-zone sand flats are nursery habitat. Turbidity and channel change cut artisanal catch. Alappad and Chavara (Kollam) in Kerala became national examples of villages fighting Indian Rare Earths / private dredging and illegal removal.
- Radioactive and heavy-mineral waste: Kerala–Tamil Nadu monazite sands, if mined without tight control, leave thorium-bearing tailings and dust — a public-health layer on top of erosion.
- Legal mining is not harmless: even a licensed CRZ clearance can over-extract if replenishment studies are paper exercises. Illegal mining adds no royalty, no restoration, and often armed local cartels (reported on stretches of Tamil Nadu, Andhra Pradesh and Maharashtra’s Konkan).
Examples
- Kerala: Kollam–Alappad mineral sand belt; protests after coastal erosion and well salinity.
- Tamil Nadu: Kanyakumari–Tuticorin garnet and silica belts; illegal river-mouth and beach removal feeding the construction boom.
- Odisha: pressure on turtle coasts if ports and sand barges disturb Gahirmatha’s intertidal profile.
- Goa and Maharashtra: dune flattening for construction sand despite CRZ.
Response
- Enforce CRZ 2011/2019, Environment Protection Act, MMDR leases, and NGT orders; map replenishment; use NDMA coastal-hazard views in clearances; give fishers a stake in watch.
Flow diagram
flowchart TD M[Coastal sand mining] --> E[Beach erosion] M --> S[Saline wells] M --> T[Turtle and fishery loss] E --> H[Homes and surge risk] S --> L[Livelihood harm] T --> L H --> P[CRZ NGT NDMA enforcement]
Conclusion
Legal and illegal coastal sand mining both strip the natural seawall. Kollam, the Tamil Nadu mineral belt, Odisha’s turtle beaches and the Konkan dunes are the proof. Production of sand must shift inland to manufactured and recycled aggregate, with CRZ and replenishment rules that are policed, not only gazetted.
Quick related
Students also ask
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Define the concept of carrying capacity of an ecosystem as relevant to an environment. Explain how understanding this concept is vital while planning for sustainable development of a region.
Next question on this syllabus topic (2019 · Q17). View answer →
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Is legal coastal mining safe if royalty is paid?
Royalty does not restore a dune. Only a scientific replenishment surplus, tightly capped, can be safe — and many coasts have no surplus.
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Can river sand bans shift pressure to beaches?
Yes. That is why manufactured sand, recycled concrete, and inland sources must be the policy substitute, not the next shoreline.
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