Cal. Civil Code § 3060

(a) As used in this section, “mine” means a mining claim or real property worked on as a mine including, but not limited to, any quarry or pit, from which rock, gravel, sand, or any other mineral-containing property is extracted by any mining, or surface mining, operation. (b) Any person who performs labor in a mine, either in its development or in working on it by the subtractive process, or furnishes materials to be used or consumed in it, has a lien upon the mine and the works owned and used by the owners for milling or reducing the ores from the mine, for the value of the work or labor done or materials furnished by each, whether done or furnished at the instance of the owner of the mine, or the owner’s agent, and every contractor, subcontractor, superintendent, or other person having charge of any mining or work or labor performed in and about the mine, either as lessee or under a working bond or contract thereon, shall be held to be the agent of the owner for the purposes of this section. The liens provided for by this section shall be enforced in the same manner as those provided for by Part 6 (commencing with Section 8000) of Division 4. (c) This section shall become operative on July 1, 2012.