Galloway sinking and walling stage

Galloway sinking and walling stage

[′gal·ə‚wā ¦siŋk·iŋ ən ′wȯl·iŋ ‚stāj]
(mining engineering)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.