S. 147 : Reassessment-After the expiry of four years-Discrepancy and mismatch-MB Shah Commission report-Illegal mining in State of Odisha-Reason to believe-Excess production-Issue subject matter of the reopening of assessment was never discussed in the original assessment proceedings-Failure to make full and true disclosure-Reassessment notice is held to be valid. [S. 148, 154, Form 26AS, Art. 226]