DCHP-1 Online
prospect hole Placer Mining 
a shaft sunk in searching for minerals.
- 1897 It takes about 30 days to sink a prospect hole to bedrock, say about 25 feet deep.
- 1900 The grabbing of a half of all diggings discovered after a certain date by a Government which "has never dug a single prospect shaft" and is doing nothing whatever to help the prospector, is deeply resented.
- 1962 . . . the prospector . . . will . . . study and locate the creek wash, the formations and surface indications, so as to know where to sink his prospect holes in the winter.
- 1897 It takes about 30 days to sink a prospect hole to bedrock, say about 25 feet deep.