Where a mineral vein is just beneath the surface a large trench called an open-cut can be used, rather than going to the expense of a level. These may become very deep and long if the geological conditions are suitable. They are usually assumed, like hushes to be a feature of early mining - but they are hard to date precisely.
Found on
http://www.encyclo.co.uk/local/20766
noting or pertaining to a type of surface mining in which coal and other flat-lying mineral deposits are removed by the excavation of long, narrow trenches.
Found on
https://www.infoplease.com/dictionary/open-cut
No exact match found.
