secondary drilling

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secondary drilling [′sek·ən‚der·ē ′dril·iŋ]

(mining engineering)

The process of drilling the so-called popholes for the purpose of breaking the larger masses of rock thrown down by the primary blast.

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No references found			And a secondary drilling operation is needed to open vacuum channels. Blow molders & thermoformers try plastic rapid tooling by Grande, Joseph A. / Plastics Technology Secondary drilling and recovery methods can rival, and exceed the outcomes relative to both rates of return, and upside you might get in the Gulf Coast states, or with offshore drilling programs. Why Consider Oil and Gas Investing by Michael Whitman / Business community Making the point Until 1991 or 1992, Lincoln Brass turned out valves and fittings primarily on screw machines and a battery of other machines for secondary drilling, milling, threading, finishing, and so on. Rotary transfer keeps valvemaker ahead by Tooling & Production			secondary bow secondary branch secondary cache secondary cambium secondary carbon atom secondary cell secondary channel secondary circle secondary circuit secondary clay secondary coast secondary cold front secondary colour secondary combustion secondary consequent stream secondary consolidation secondary consumer secondary cosmic rays secondary crater secondary creep secondary crusher secondary cyclone secondary damage secondary diagonal secondary distribution feeder secondary drilling Secondary Education Secondary Education, Specialized Secondary Educational Institutions, Specialized secondary electron Secondary Electron Emission secondary emission secondary enlargement secondary enrichment secondary exit secondary extinction secondary facade secondary façade secondary feeders secondary fermentation secondary flow secondary focus secondary fragment secondary front Secondary General-Education School secondary geosyncline secondary glacier secondary glazing secondary great circle secondary grid emission secondary grinding			secondary dentition Secondary Deployment Mechanism Secondary Designated Target Secondary Deuterium Kinetic Isotope Effect secondary deviation secondary deviation secondary deviation secondary deviation secondary deviation secondary diabetes secondary diabetes mellitus secondary diabetes mellitus secondary diabetes mellitus Secondary diagnosis secondary diagonal secondary diagonal Secondary Diaphragm Housing Cover secondary digestion secondary disease secondary disease secondary disease secondary disease secondary distal RTA secondary distribution secondary distribution Secondary Distribution Center secondary distribution feeder Secondary distribution/offering Secondary Distributions Secondary Document Custodian secondary drilling Secondary Drinking Water Regulation Secondary Drinking Water Standards secondary drive Secondary drowning Secondary drowning Secondary drowning secondary drug action secondary dysmenorrhea secondary dysmenorrhea secondary dysmenorrhea secondary easement secondary education secondary education secondary education Secondary Education Association of Australia Secondary Education Cash Assistance Programme Secondary Education Development and Improvement Project Secondary Education Development Plan Secondary Education Development Program Secondary Education Development Unit Secondary Education Enhancement Project Secondary Education for Migrant Youth Secondary Education in Nigeria Secondary Education Interdisciplinary Unit Secondary Education Program Secondary Education Project Secondary Education Quality Improvement Secondary Education Sector Improvement Project Secondary Education Support Programme Secondary Education Teaching

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