Launder

A trough or channel — usually of wood, though sometimes canvas, hide or later iron — used to carry a controlled flow of water, or of crushed ore in water suspension, around a mine's surface dressing floor.

Historical usage

Launders were everyday infrastructure wherever water-powered ore dressing was used, carrying water to and between buddles, stamps and other processing machinery, and sometimes raised on trestles to feed an overshot waterwheel from above.

How it worked

A launder works by gravity alone, carrying water or a water-and-crushed-ore slurry along a gently sloping, open-topped channel from one point to the next — from a supply leat or reservoir to a wheel, from a set of stamps to a buddle, or carrying waste water away from the dressing floor.

Why it was used

A launder was the cheapest and simplest way to move water or slurry exactly where it was needed across a dressing floor, needing no power of its own beyond the natural fall of the ground, and could be extended, branched or repositioned relatively easily as a mine's surface layout changed.

Risks & limitations

Being open-topped and usually built of wood, launders needed regular maintenance against rot, leaks and blockage by settled ore particles, and their fixed, gravity-fed slope meant a dressing floor's whole layout was often designed around getting water to fall the right way through them.

Regional variation

The term and the basic technique are common across British hard-rock mining districts; overshot-wheel feed launders in particular are a recurring feature of Cornish, Welsh and Pennine mine sites wherever a natural fall of water could be captured above the wheel.

Images

Mines associated with this term

Included only where MineArchive's own research gives a reasonable evidential basis — not every mine where this might plausibly apply.

• Killhope Lead Mine — County Durham (surviving physical example)
  Killhope's restored site includes a surviving launder feeding the Killhope waterwheel, among its other preserved ore-dressing structures.

Sources

1. (secondary) Definition of launder — Mindat.org Glossary
2. (secondary) Glossary of Mining Terms — Open University Geological Society (South West Branch)

Record created: 20 August 2026 · Last researched: 20 August 2026