You must submit a completed Report of Sales and Royalty Remittance (Form ONRR-2014) each month once sales or use of production occur, even though sales may be intermittent, unless ONRR otherwise authorizes. This report is due on or before the last day of the month following the month in which production was sold or used, together with the royalties due to the United States.
30 C.F.R. §1210.353