In the given scenario, since the DRC 01A has been issued under Section 73 of the CGST Act, 2017, it implies that the tax authorities have raised a demand for the non-payment of RCM (Reverse Charge Mechanism) on the mining royalty for the FY 2021-22. Given that the royalty has been paid but the RCM was not deposited, you can still discharge the RCM liability by making the payment along with any applicable interest, if required, as per the provisions of Section 75.
Upon payment of the due tax, you can claim the input tax credit (ITC) on the RCM paid, provided the conditions under Section 16 of the CGST Act are met, i.e., the tax paid is used for the business and the relevant tax invoices are available. To deposit the RCM, you would need to go through the GSTR-3B filing mechanism by paying the RCM tax under the appropriate head (GST under reverse charge).
Post payment, the ITC can be claimed in the GSTR-3B for the corresponding period. Ensure compliance with the timelines specified under Section 73 and Section 75, including the payment of any applicable interest for delayed deposit.
Note: Please also consult with your GST Consultant as this discussion is not an Legal Opinion.