untopping

English

Verb

untopping

  1. present participle and gerund of untop

Noun

untopping (uncountable)

  1. (mining) Removal of overburden from an old mine to allow continued economic operation.
    • 2003, Ivor Wynne Jones, Victorian Slate Mining, page 59:
      J.E. Greave's diaries tell us he took this suggestion on board, and on 4 September 1894 he and his brother R.M Greaves began discussing the "untopping" of a large area at Llechwedd.
    • 2015, David Gwyn, Welsh Slate: Archaeology and History of an Industry, page 131:
      Untopping enabled a road to be built into part of Llechwedd in Ffestiniog in the 1960s
    • 2019, Anthony Coulls, The Slate Industry:
      […] continued production and extraction has resulted in the untopping of old workings, meaning that the roof has been taken off long worked-out galleries to allow good slate to be made.

See also

References

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