Evaluating Gondwana Coal Statements

Let's analyze each statement regarding Gondwana coal:

• Statement A: Gondwana coal contributes to the largest proportion of both the reserves and production of coal. This statement is correct. Gondwana coalfields are the primary source of coal reserves and production in India, accounting for the vast majority.
• Statement B: Gondwana coal is about 250 million years old. This statement is correct. The formation of Gondwana coal deposits primarily occurred during the Permian period, which spans roughly 299 to 252 million years ago, making the age approximation accurate.
• Statement C: Gondwana fields have largely anthracite coal. This statement is incorrect. Gondwana coal, especially in major Indian basins, is predominantly bituminous coal, not anthracite. Anthracite is a rarer, higher-grade coal.
• Statement D: The Gondwana coal is almost free from moisture but it contains sulphur and phosphorous in small variable quantities. This statement is considered correct in the context of comparing it with other coal types. Gondwana coals typically have low moisture content and variable, but generally manageable, amounts of sulphur and phosphorus.

Identifying Correct Statements

Based on the analysis, statements A, B, and D are correct, while statement C is incorrect.

Conclusion

The correct combination of statements is A, B, and D.

Therefore, the correct option is 1.