Step 1: Understanding the Question: The objective here is to identify the specific Indian state prominently known for the hazardous and heavily criticized practice known as "rat-hole mining."
Step 2: Key Concept: Rat-hole mining involves digging extremely small, narrow, and structurally unsupported horizontal tunnels (often just \(3\) to \(4\) feet high) to manually extract coal.
It is usually employed in geographical areas where the natural coal seams are exceedingly thin and difficult to reach.
Step 3: Detailed Explanation:
This dangerous mining practice is predominantly associated with the northeastern Indian state of Meghalaya, particularly throughout the coal-rich Jaintia Hills region.
Because the coal seams in Meghalaya are uniquely thin and awkwardly positioned, traditional large-scale open-cast or highly mechanized underground mining techniques are deemed economically unviable by operators.
Consequently, locals dangerously resort to manual rat-hole mining, crawling into these tiny unventilated tunnels.
It is highly controversial due to extreme safety hazards (the tunnels frequently flood or physically collapse, trapping miners) and severe environmental degradation (producing acid mine drainage that aggressively pollutes local rivers).
Due to these glaring safety and ecological concerns, the National Green Tribunal (NGT) effectively and legally banned this practice across Meghalaya in \(2014\).
Step 4: Final Answer: The correct state associated with rat-hole mining is Meghalaya.