Definition
Mine run coal is a trade and legal term in mining law referring to the total output of coal as it comes directly from the mine face — unsorted, unscreened, and unprocessed. It encompasses all grades and sizes produced by the picking operation, including lump coal, nut coal, and slack (fine or dust-grade coal). The term describes coal in its raw, commingled state before any screening, sizing, or preparation work separates it into distinct commercial grades.
In legal contexts, the phrase appears most often in coal lease agreements, royalty clauses, and mining contracts where the basis for payment, measurement, or delivery must be precisely defined. Whether a royalty or price is calculated on mine run coal — as opposed to screened or cleaned coal — has significant economic consequences, since mine run coal includes the lower-value slack that screened coal excludes.
Common Language
Modern common usage (Wiktionary): Not a general-purpose term in modern lay English; primarily a technical and industry expression.
Historical common usage (Webster's 1913): Not independently defined; the component words "mine" and "run" carry their ordinary meanings — a place of excavation and the continuous output of a production process, respectively.
Editorial note: The phrase has no meaningful life outside mining industry and legal contexts. Lay readers encountering it in a historical contract or deed might parse it loosely as "coal from a mine," missing the critical legal implication: mine run coal is unscreened, all-inclusive output, and the distinction from screened or prepared coal is the entire point of the term in most legal disputes.
Common Confusion
Mine run coal is frequently confused with, or loosely substituted for, terms like "run-of-mine coal," "lump coal," or "screened coal" in historical documents. These are not synonyms. Run-of-mine (sometimes written as a hyphenated compound) is the modern industry equivalent and means essentially the same thing — total unscreened output — but historical contracts may use "mine run" and "run-of-mine" inconsistently or treat them as interchangeable when they are not. Lump coal and nut coal are specific size grades that are components of mine run coal, not equivalent to it. Screened coal has had the slack removed and commands a higher price per ton; a royalty clause tied to screened coal will yield different results than one tied to mine run coal, even at the same per-ton rate.
Why It Matters in Research
The term is primarily a contract interpretation term, not a term of art in statutory law. Researchers will encounter it most heavily in:
1. Royalty and lease disputes. Late 19th and early 20th century coal leases frequently defined payment obligations by reference to tons of mine run coal, and litigation turned on whether the operator had improperly screened coal before weighing it for royalty purposes — skimming the higher-value lump while paying royalties on only a portion of total output. Courts in Pennsylvania, West Virginia, Kentucky, and other coal states generated substantial case law on this issue through the early 1900s.
2. Sales contract disputes. Price terms in coal supply contracts specified mine run coal to guarantee the buyer received the full gradation of output, including slack, rather than cherry-picked lump grades. Disputes arose when sellers screened before delivery.
3. Measurement and weight clauses. The inclusion or exclusion of slack materially affects tonnage calculations. Researchers reading historical arbitration awards, lease audits, or mining commission records should flag any weight or measurement clause and identify whether it applies to mine run or screened coal before drawing conclusions about volume or value.
The jurisdictional center of gravity for this term is Appalachian coal country — Pennsylvania, West Virginia, Kentucky, Ohio, and Virginia — where the bulk of mine run coal litigation developed. Researchers using the Law Mind corpus should cross-reference royalty clause entries, mining lease forms, and state mining commission reports from roughly 1880 to 1940, the period in which mine run coal as a legal concept was most actively litigated.
Historical Dictionary Support
Bouvier's Law Dictionary defines mine run coal succinctly as "all of the coal that comes out of the mine from the picks, embracing lump, nut and slack," citing 57 S.W. 12. This is the core legal definition and remains accurate as a statement of the term's meaning. Bouvier captures the essential feature — comprehensiveness, including all grades — in a single sentence, which is appropriate given the term's function as a trade term incorporated by reference into legal instruments rather than a doctrinally complex legal concept.
Historical legal dictionaries beyond Bouvier offer little independent treatment. The term was too industry-specific and contractual in character to receive sustained attention in general legal dictionaries. Its legal content was built primarily through case law and industry custom rather than statutory definition. Researchers should not expect dictionary support to carry them far; the real authority lies in the reported decisions of state courts in coal-producing jurisdictions.
Jurisdictional Note
The term originates in American coal mining practice and has its primary legal development in Appalachian coal-state courts. Pennsylvania and West Virginia case law from the late 19th and early 20th centuries provides the densest interpretive record. The term does not appear in meaningful volume in British or Commonwealth legal sources, where "run-of-mine" is the more common equivalent.