43 CFR § 3809.603 - How does BLM serve me with an enforcement action?
(a) BLM will serve a noncompliance order, a notification of intent to issue a suspension order, a suspension order, or other enforcement order on the person to whom it is directed or his or her designated agent, either by -
(1) Sending a copy of the notification or order by certified mail or by hand to the operator or his or her designated agent, or by any means consistent with the rules governing service of a summons and complaint under rule 4 of the Federal Rules of Civil Procedure. Service is complete upon offer of the notification or order or of the certified mail and is not incomplete because of refusal to accept; or
(2) Offering a copy at the project area to the designated agent or to the individual who, based upon reasonable inquiry, appears to be in charge. If no such individual can be located at the project area, BLM may offer a copy to any individual at the project area who appears to be an employee or agent of the person to whom the notification or order is issued. Service is complete when the notice or order is offered and is not incomplete because of refusal to accept. Following service at the project area, BLM will send an information copy by certified mail to the operator or the operator's designated agent.
(c) The mining claimant or operator may designate an agent for service of notifications and orders. You must provide the designation in writing to the local BLM field office having jurisdiction over the lands involved.