Definition
In mining law, timbering refers to the system of structural support installed within a mine to prevent the roof or surrounding formation from collapsing onto the passageway below. The technique involves placing horizontal timbers or caps across the width of a mine passage just beneath the roof, with the ends of those horizontal members resting on vertical posts or props. Together, these components create a framework that bears the load of the overburden and protects workers and the workings from cave-ins.
The term is used in this technical, underground-support sense in mining statutes, safety regulations, workers' compensation claims, and tort actions arising from mine accidents. When a mining statute imposes a duty to timber, it means a duty to install and maintain this supporting framework — not merely to supply or stockpile wood.
Common Language
Modern common usage (Wiktionary): Any structure, partial structure, or other item made from timber.
Historical common usage (Webster's 1913): The act of furnishing with timber; also, timbers collectively; timberwork; timber.
The ordinary meaning of timbering is broad and constructional — it captures any use of wood as a building material. The legal mining sense is narrower and more technical: it describes a specific underground support method with defined components (caps, posts, and their arrangement relative to the roof). A researcher reading a mining safety statute that mandates "proper timbering" should not read that phrase as a general directive about wood construction; it carries the technical underground-support meaning that Bouvier records.
Common Confusion
Timbering should not be confused with timber rights or timber harvesting. Those bodies of law govern who may cut trees from land and under what conditions — a property and natural resources question. Timbering in the mining sense has nothing to do with standing trees or surface harvesting. The shared root word has caused researchers to misfiled mining-safety materials under forestry or property headings, and vice versa. Similarly, timbering as a mine-support obligation is distinct from the general duty of a mine operator to maintain safe conditions; timbering is one specific, enumerated component of mine safety law, and courts and legislatures have treated it as a discrete, independently enforceable duty.
Why It Matters in Research
The mine-support meaning of timbering is largely confined to a period of American legal history running from the late nineteenth century through the mid-twentieth century, when underground coal and hard-rock mining were heavily litigated and the subject of dense state statutory frameworks. Researchers working in that period will encounter timbering as a term of art in three main contexts: (1) employers' statutory duties under state mine safety acts; (2) negligence and wrongful death actions brought by injured miners or their families, where the failure to timber adequately was a common allegation; and (3) workers' compensation decisions that turned on whether a mine operator had satisfied its timbering obligations.
After the mid-twentieth century, federal mine safety legislation — culminating in the Federal Mine Safety and Health Act of 1977 — absorbed and largely displaced state-by-state timbering requirements, and the term itself becomes less prominent in legal sources as the regulatory vocabulary shifted to "ground control" and "roof support." A researcher using only post-1980 materials may find the word timbering underrepresented relative to its importance in earlier case law.
Jurisdictional traps are significant here. State mine safety statutes varied considerably in their timbering requirements — some imposed strict liability for failure to timber, others a negligence standard, and the specifics of what constituted legally adequate timbering differed by state and by type of mine. A case from Kentucky (the jurisdiction reflected in Bouvier's cited authority) cannot be assumed to state a universal rule. Cross-check any timbering holding against the specific state statute in force at the time.
Within the Law Mind corpus, researchers who begin with this entry should move quickly to the encyclopedia's treatment of timber rights to confirm they are in the correct subject area before proceeding, since the index and subject headings of older materials sometimes group timbering cases under property or natural resources rather than mining law or labor law.
Historical Dictionary Support
Bouvier's Law Dictionary provides the sole historical dictionary entry for this term and is instructive precisely because it goes beyond a simple definition to identify the structural components: the horizontal cap, the vertical post, and the positional relationship between cap and roof. That level of detail reflects how courts and legislatures used the word — as a technical term of art with identifiable, verifiable elements, not a loose synonym for any underground woodwork.
What Bouvier does not address is the legal consequence of inadequate timbering — the standard of care, the allocation of duty between mine operator and individual miner, or the effect of a miner's own failure to call for timbering on his negligence claim. Those questions generated substantial case law that the dictionary entry leaves entirely aside. Researchers should treat the Bouvier definition as the starting point for what timbering means physically, while looking to statutory and case sources for its legal obligations and consequences.
Jurisdictional Note
State mine safety statutes of the nineteenth and early twentieth centuries imposed timbering duties with varying specificity and varying standards of liability. Kentucky, Pennsylvania, Illinois, and Ohio each developed distinct bodies of timbering case law. Federal preemption after 1977 substantially reduced but did not entirely eliminate state-law timbering claims, particularly in workers' compensation contexts.
Encyclopedia Cross-Reference
Timber Rights — Ownership and Harvesting Regulation (The Law Mind Property Law Encyclopedia). Note: that entry addresses surface timber and harvesting rights; researchers should use it to confirm the boundary between property-law timber questions and the mine-safety timbering question addressed here.