How To Use Footwall In A Sentence
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At 20 fathoms the winze came out into the side of a large stope which was curved so that despite being on the footwall there was a grave danger of sliding over the edge.
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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.
Principles of Mining Valuation, Organization and Administration
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They connect the hanging wall of one fault to the footwall of another fault, and have special deforming feature, beside them on the hanging wall there are transverse anticlines.
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The ratio of ore area to total explored area, measured in the plane of the footwall, was 21-1/2 per cent.
The Economic Aspect of Geology
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Although greatly attenuated in shear zones, layers may still be continuous from footwall to hanging wall.
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Uplifted and incised fluvial terraces are preserved in footwall valleys, including those of the Ladopotamos and Vouraikos rivers.
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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 Economic Aspect of Geology
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In the footwall, there is density increase and porosity reduction of the argillaceous matrix approaching the fault.
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As much as 1.3 km of sediment were eroded on the footwall blocks of normal faults at that time.
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The total area of the footwall to a depth of 3,000 feet is approximately 9,650 acres.
The Economic Aspect of Geology
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These twin disadvantages usually warrant a straight incline in the footwall.
Principles of Mining Valuation, Organization and Administration
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Corroded danburite up to 8 cm in length was abundant around footwall portions of the pocket.
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This rotation caused the large-scale monoclines that characterize the footwall geometry of the Güney and Kuzey detachments.
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Figure 6 shows outcrop Al as a representative example of the shelf to shoreface successions on the footwall of the Jalan Tutong Fault.
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The new owners gave an extended lease of life to the mine by extracting ore from the footwall zone of the old stopes that were thought to have been mined out.
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The Paunglaung Fault is a top-to-the-east thrust, which folds Aptian limestone in its footwall.
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Il is envisaged that while the footwall anorthositc was still unconsolidated possibly to a depth in excess of 10m, liquefaction of part of this interval occurred, and at a similar time chromite commenced accumulating.
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The second fault, below, shows oblique-slip slickensides, and beneath the slickensides, in the footwall, are some calcite masses and a footwall breccia.
Friday Fault Photos
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These fault-parallel footwall anticlines are best developed along fault segments 3 and 4, although there are also examples of fault-parallel folding in the footwall of fault segments 1 and 2.
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Second, a change in orientation and polarity of the stretching lineation and shear bands is observed in the footwall towards the Nesna shear zone.
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The faults have a systematic geometric relationship with folds, with anticlines in the mutual hanging walls of fault pairs and broader footwall synclines that define the shallow dish forms of the polygons.
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As for the mesoscale normal faults inside the Fault Zone, they cannot be considered as classical brittle planar normal fault planes downwarping a hanging wall relative to a footwall along a single discrete plane.
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The sedimentary units in the hanging wall were deposited in fault-bounded basins while their footwalls progressively emerged through the ductile and brittle crust.
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The first, above, is nearly dip-slip in relative movement, and you can see a close-up of the footwall breccia.
Friday Fault Photos
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Density contrasts at intermediate depths would be expected to occur at footwall ramps, suggesting that detailed gravity studies might be rewarding.
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The correlation is supported by an analysis of stratal expansion, throw development, and data on the sandstone ratio of corresponding footwall and hanging-wall intervals.
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Restoration work on the damaged footwall infrastructure in the
ANC Daily News Briefing
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At its southern boundary the terrane lies in the footwall of another north-directed thrust with Dazhuqu terrane ophiolitic rocks or Paleogene Liuqu Conglomerate in the hanging wall.
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The total area of ore measured on the footwall was
The Economic Aspect of Geology
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All granitoids in the footwall of the Simav detachment are dominated by medium - to coarse-grained granite, granodiorite, quartz monzonite, diorite and syenogranite.
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The carbonates in the footwall are strongly foliated and sheared parallel to the thrust.
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Some of the cols must indeed mark formerly active valleys that led westwards and southwards out of the basin prior to active infill, but we have found no evidence that Panorama gorge was shut off by footwall uplift during fault propagation.
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The clasts of the Jurassic strata, particularly the stromatolite-bearing, cherty limestone and purple quartzite, can be correlated with those in the footwall of the fault.
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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.
ANC Daily News Briefing
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Normal faulting led to the unroofing of metamorphic rocks in their footwalls.
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Anticlinal folds occupy the mutual hanging walls of conjugate fault pairs with synclines occupying mutual footwalls between adjacent pairs.
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A smaller and lower intensity damage zone also occurs within the footwall of the thrust.
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As a result, Triassic rocks in the hanging wall thrust onto Upper Cretaceous rocks in the footwall.
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In structural geology the relative movement of the banging wait and footwall is a major factor to classify various faults.
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There is some control on the footwall and hanging-wall geometry associated with the Bristol Channel Thrust but no decisive seismic control on the amount of heave across it.
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In the footwall of the antithetic fault, a drag fold creates an anticline which is best seen in quarry Q1.
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At several localities a west-verging footwall syncline has developed as a consequence of westward transport on the overlying thrust sheet.
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In this arid climate evaporites form; alluvial fans lie at the base of footwall scarps and carbonate reefs grow.
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They contain kilometre-scale blocks of igneous basement rocks, plucked by the rising diapir from the footwall of the fault.
