gophering

gophering

[′gō·fə·riŋ]
(mining engineering)
A method of breaking up a sandy medium-hard overburden where usual blastholes tend to cave in, by firing an explosive charge in each of a series of shallow holes; debris is cleared, and holes are made deeper for further charges, until they are deep enough to take enough explosives to break up the deposit.
References in classic literature ?
It-all's plain gophering," Daylight muttered aloud.