The bottom, horizontal surface of an enclosed space.

1. The rock underlying a stratified or nearly horizontal deposit, corresponding to the footwall of more steeply dipping deposits.

2. A horizontal, flat ore body.

Boards laid at the heading to receive blasted rocks and to facilitate ore loading.

One of a series of vertical plates extending across the bottom of a ship at right angles to the center line and forming part of the bottom framing of the hull.