from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Geology The mass of rock underlying a mineral deposit in a mine.
- n. Geology The underlying block of a fault having an inclined fault plane.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The section of rock that extends below a diagonal fault line (the corresponding upper section being the hanging wall).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the lower wall of an inclined fault
The second fault, below, shows oblique-slip slickensides, and beneath the slickensides, in the footwall, are some calcite masses and a footwall breccia.
The first, above, is nearly dip-slip in relative movement, and you can see a close-up of the footwall breccia.
Restoration work on the damaged footwall infrastructure in the
Molathlegi William Modise, a team leader, alleged that in 1994 or 1995 blasting was done in the footwall of the open cast pit south of where a subsidence occured on November 27 last year.
These twin disadvantages usually warrant a straight incline in the footwall.
An inclined shaft may be sunk either on the vein, in which case a pillar of ore must be left to support the shaft; or, instead, it may be sunk a short distance in the footwall, and where necessary the excavation above can be supported by filling.
The total area of the footwall to a depth of 3,000 feet is approximately 9,650 acres.
The total area of ore measured on the footwall was
In the developed area, 160,000,000 tons of ore had been found, or approximately one ton per square foot of footwall area, or 43,800 per acre of footwall explored.
The ratio of ore area to total explored area, measured in the plane of the footwall, was 21-1/2 per cent.