Advance per round
From WebRef.org
Jump to navigationJump to search The length, measured along the longitudinal axis of the working, tunnel, or gallery, of the hollow space broken out by each round of shots. For raises, it is upward advance; for sunk shafts, downward advance. Fraenkel
Source: Dictionary of Mining, Mineral, and Related Terms
Sponsor: Upgrade your MacBook Pro to an SSD for up to 6x the capacity and 106x the speed of the original drive. Includes DIY install videos to make upgrading easy. Shop online now!
