Bar

1. A placer deposit, generally submerged, in the slack portion of a stream. Also, an accumulation of gravel along the banks of a stream; bar diggings.
2. A mass of inferior rock in a workable deposit of granite. AGI
3. A fault across a coal seam or orebody. AGI
4. A banded ferruginous rock; specif. jaspilite. AGI
5. A vein or dike crossing a lode.
6. Any band of hard rock crossing a lode. Arkell
7. A unit of pressure equal to 1,000,000 dyn/cm² , 1,000 mb (100 kPa), or 29.53 in (750 mm) of mercury. Hunt
8. A bank of sand, gravel, or other matter, esp. at the mouth of a river or harbor, often obstructing navigation. Webster 2nd
9. An offshore ridge or mound of sand, gravel, or other unconsolidated material submerged at least at high tide, esp. at the mouth of a river or estuary, or lying a short distance from, and usually parallel to, the beach. Hunt
10. A drilling or tamping rod. Fay
11. A strap or beam used to support the roof between two props or other supports. Mason
12. A length of steel pipe equipped with a flat cap at one end and a jackscrew on the opposite end by means of which the pipe may be wedged securely in a vertical or horizontal position across an underground workplace to serve as a base on which a small diamond or rock drill may be mounted. Syn: drifter bar; drill bar; drill column. Long
13. A heavy steel rod with either pointed or flattened ends used as a pry or as a tool by miners to dislodge loose rock in roof or sidewalls of an underground workplace. Syn: scaling bar
14. A piece of material thicker than sheet, long in proportion to its width or thickness, and whose width-thickness ratio is much smaller than that of sheet or plate, as low as unity for squares and rounds. ASM, 1

Source: Dictionary of Mining, Mineral, and Related Terms