New Delhi: The coal ministry on Wednesday said it has completed the annual process of sampling and grading of coal in 427 mines and the new fuel grade will come into effect from April 1 this year.

Of the total 427 mines, 331 are central public sector units, 69 are under state governments and 27 are private sector mines, the coal ministry said in a statement.

"To ensure purity of grade, the extracted samples were analyzed in two different laboratories," it said.

The ministry further said, "The process of declaration of annual grading of mines as per the prescribed procedure has been completed" and the declared grades will come into effect from April 1, 2024.

The Coal Controller's Organization (CCO), which has regional offices at Dhanbad, Ranchi, Bilaspur, Nagpur, Sambalpur and Kothagudem, took up the task of collecting and analyzing coal samples from coal and lignite mines for the current financial year.

The CCO, a subordinate office of the Coal Ministry, lays down the standard procedure for sampling dry fuel and inspects collieries to ensure purity of grade and grade of coal.