heading-overhand bench method

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heading-overhand bench method [¦hed·iŋ ′ō·vər‚hand ′bench ‚meth·əd]

(mining engineering)

A tunneling method in which the heading is the lower part of the section and is driven at least a round or two in advance of the upper part (bench), which is taken out by overhand excavating. Also known as inverted heading and bench method.

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No references found			header bond header course header duct header file header joist header label header record header tile header-high header-type boiler Headframe headgear headhouse headhunting Heading heading angle heading blasting heading bond heading chisel heading course heading joint heading line heading side heading wall heading-and-bench mining heading-overhand bench method heading-upward plan position indicator headland Headlands Beach State Park headlap Headless Horseman Headless Horseman, the headless system Headlessness Headlight headline headman headmaster headmold headphone headphones Headpiece headroom headrope heads heads down heads-up display headset headship headshrinker headsill			heading off at the pass heading off at the pass heading off at the pass heading off at the pass Heading Reference Assembly Heading Reference Set Heading Reference Unit Heading Select heading select feature Heading Select Indicator heading side Heading Size 1 Heading Size 2 Heading Size 3 Heading Size 4 Heading Size 5 Heading Size 6 Heading Slaved Heading to A Course Intercept Heading to a DME Distance Heading to A Radial Heading True heading up heading up heading up heading up heading wall Heading, Depth, Temperature Module heading, intro, rule heading-and-bench mining heading-overhand bench method heading-upward plan position indicator Headings Headings Headings Headings Headings Issues Theory/Rules Applications Conclusion Headington Committee for Development Action Headington Institute Headington Quarry Morris Dancers headlamp headlamp headlamp headlamp Headlamp washer Headlamp washer Headlamp wiper Headlamp wiper Headlamps Headlamps Headlamps headland headland Headland (TV series) Headland (TV series) Headlands Headlands Headlands and bays Headlands and bays Headlands and bays Headlands and bays

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