room-and-pillar
Americanadjective
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Mountain Laurel will then use the room-and-pillar mining method.
From Washington Times • Feb. 20, 2019
The statement says Arch will transition its Mountain Laurel operation in southern West Virginia from longwall to room-and-pillar mining next year.
From Washington Times • Feb. 14, 2019
They remove the deposits with a room-and-pillar approach: using explosive blasts to loosen the salt, while leaving pillars of salt in place to support the overhead layers.
From Washington Times • Feb. 17, 2017
Theirs is a room-and-pillar mine, in which natural pillars are left during the coal removal to support the roof, some of which are later removed.
From New York Times • Apr. 23, 2010
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
