43 CFR § 3137.74
What must I do after BLM approves my continuing development obligations plan?
June 11, 2020
No later than 90 calendar days after BLM's approval of your plan submitted under 3137.71(b), you must certify to BLM that you started operations to fulfill your continuing development obligations. BLM may require you to—
(a) Supply documentation to support your certification; and
(b) Submit periodic reports that demonstrate continuing development.