Definition
A mine is an excavation in the earth — a pit, shaft, tunnel, or system of workings — from which metallic ores, coal, or other mineral substances are extracted by digging. In law, the term carries both a physical meaning (the excavation itself) and a property meaning (the legal interest in the mineral deposit and the right to work it).
Two distinct legal uses appear in practice:
1. Physical structure. A mine as an opening or series of openings into the earth made for the purpose of extracting minerals. This distinguishes a mine from a quarry (surface extraction of stone) and from an oil or gas well (extraction by drilling and flow rather than excavation).
2. Property interest. A mine as the subject of ownership, conveyance, lease, or license. Under property law, the right to mine can be severed from surface ownership, creating a separate mineral estate. A conveyance of a "mine" may pass only the right to extract specific minerals, or it may pass a broader mineral estate, depending on jurisdiction and instrument language.
Common Language
Modern common usage (Wiktionary): The pronoun "mine" functions as a possessive, meaning "that which belongs to me." As a noun, "mine" also refers to an explosive device buried in the ground or sea.
Historical common usage (Webster's 1913): Webster's 1913 refers the reader to "Mien" with a notation of obsolescence, offering no substantive common definition for the excavation sense — reflecting that the mining sense was so established by 1913 as to need no ordinary-language gloss.
The legal term has no overlap with the possessive pronoun. The risk for corpus researchers is not confusion between meanings but rather false hits: any full-text search on "mine" in historical legal documents will return massive noise from possessive usage and, in 20th-century materials, from references to explosive ordnance. Query construction must account for this.
Common Confusion
Mine and quarry are often used interchangeably in ordinary speech but are technically distinct in law and in mineral rights instruments. A mine typically involves underground extraction of metallic ores, coal, or similar minerals by digging or tunneling; a quarry involves open-surface extraction of stone or similar rock. The distinction affects whether a deed conveying mining rights passes the right to quarry stone, and historical instruments often resolved this poorly. Similarly, "mine" should be distinguished from "mineral well" or "oil well" — extraction by flow rather than excavation falls outside the traditional mine definition and is governed by a separate body of oil and gas law.
Why It Matters in Research
Search noise is the primary hazard. "Mine" as a possessive pronoun appears on virtually every page of historical legal text. Corpus searches must use proximity operators, phrase searches, or contextual filters to isolate the mining sense.
The 19th-century American cases are foundational here. The second edition of Black's cites Marvel v. Merritt and Murray v. Allred, both of which engage the definition of "mine" in the context of property conveyances. These cases illustrate how courts in the late 1800s were working out what a deed conveying a "mine" actually transferred — the physical excavation, the mineral deposit, or a broader mineral estate.
Mineral severance doctrine is the critical downstream concept. Once you establish that a mine is a legally cognizable property interest, the question immediately becomes whether that interest has been severed from the surface estate, and what that severance instrument actually said. Historical deeds are frequently ambiguous on this point. Researchers tracing title to mining properties need to read "mine" in instruments against the entire body of that jurisdiction's severance law.
The term also appears in regulatory and labor law contexts — mine safety legislation, workers' compensation for miners, and federal mining claims under the General Mining Act of 1872 — where "mine" receives statutory definitions that may differ from the common law property definition. The statutory definition controls in those contexts.
Historical Dictionary Support
Black's first and second editions are consistent: both adopt the Webster definition of a mine as a pit or excavation from which metallic ores or mineral substances are taken by digging. The second edition adds case citations but does not expand or modify the core definition. This brevity reflects that by the late 19th century, the physical meaning of "mine" was not genuinely contested — the legal disputes were about property rights in mines, not about what a mine was.
Rapalje & Lawrence's entry reproduced here is not responsive to the term "mine" — it addresses determinable estates, suggesting a source-matching error in compilation. Researchers should not rely on it for this term.
Anderson's Dictionary of Law entry under "mine" similarly misaligns, presenting material on "unsound mind" rather than mine as an excavation. This likely reflects an indexing or compilation artifact. Anderson does cross-reference CAPACITY, INSANITY, and related mental-state terms, which are distinct entries entirely.
The absence of a developed common-law definition of "mine" in the historical dictionaries is itself informative: the term was treated as a physical fact requiring no great legal elaboration, while the real legal work happened in mineral rights doctrine, which the dictionaries address under separate headings such as MINERAL, MINERAL RIGHTS, and MINING.
Jurisdictional Note
The distinction between what passes under a conveyance of a "mine" versus a "mineral interest" versus a "mineral estate" varies significantly by state. Western states with substantial federal mining history follow different default rules than Eastern states with older coal or iron mining traditions. Federal land law (General Mining Act of 1872 and its successors) defines "mine" and "mining claim" independently for public lands purposes.