| Domain | Definition | ||
| Mining | A drift or opening driven at an angle of about 45 degrees to the strike and in the plane of the seam. See also: half-and-half plane. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
| Webster's Online Dictionary |
| Domain | Definition | ||
| Mining | A drift or opening driven at an angle of about 45 degrees to the strike and in the plane of the seam. See also: half-and-half plane. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
