Cal. Pub. Resources Code § 2771
Whenever a proposed or existing surface mining operation is within the jurisdiction of two or more public agencies, is a permitted use within the agencies, and is not separated by a natural or manmade barrier coinciding with the boundary of the agencies, the evaluation of the proposed or existing operation shall be made by the lead agency in accordance with the procedures adopted by the lead agency pursuant to Section 2774. If a question arises as to which public agency is the lead agency, any affected public agency, or the affected operator, may submit the matter to the board. The board shall notify in writing all affected public agencies and operators that the matter has been submitted, specifying a date for a public hearing. The board shall designate the public agency which shall serve as the lead agency, giving due consideration to the capability of the agency to fulfill adequately the requirements of this chapter and to an examination of which of the public agencies has principal permit responsibility.
Ca. Pub. Res. Code § 2771