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The lower side of a horizontal or inclined rock body or fault. If the fault has dip-slip translational movement along a normal fault, the footwall block is upthrown; the footwall block is downthrown along a reverse fault.
It is the name given to the host rock of an ore deposit which is physically below the ore deposit.
the mass of rock beneath an inclined fault plane.
the underlying side of a fault, orebody or stope.
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