pioneer tunnel

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pioneer tunnel [‚pī·ə′nir ‚tən·əl]

(mining engineering)

A small tunnel parallel to but ahead of a main tunnel and used to make crosscuts to the path that the main tunnel will follow.

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No references found			Pinzgau Pinzon Pinzón Pinzón, Martín Alonso PIO mode Pio Pico State Historic Park Pio, Louis Pio, Padre Piobert lines PIOCS Piombino Piombo, Sebastiano del pion pion bremsstrahlung pion condensate pion double-charge exchange Pioneer Pioneer Brigade Pioneer Camp Pioneer Dawn Pioneer Historic Byway Pioneer Journals Pioneer Leader Pioneer Newspapers Pioneer State Recreation Area pioneer tunnel Pioneers Pioner Pionerskaia Pionerskaia Pravda Pionerskii pionium Pions Piontkovskii, Andrei Piontkovskii, Andrei Andreevich Piontkovskii, Sergei Piontkovskii, Sergei Andreevich Piophilidae piotine Piotr Jaroszewicz Piotr Michalowski Piotr Sciegienny Piotrkow Piotrków Piotrkow Statute of 1496 Piotrków Statute of 1496 Piotrków Trybunalski Piotrovskii, Adrian Piotrovskii, Adrian Ivanovich Piotrovskii, Boris Piotrovskii, Boris Borisovich			Pioneer Leader Pioneer League Pioneer Living Experience Pioneer Long Distance, Inc. Pioneer Memorial Church Pioneer Memorial Theatre Pioneer Mutual Hook and Ladder Society Pioneer Natural Resources Company Pioneer New Media Technologies Pioneer Newspapers Pioneer Pacific College Pioneer Pekao Investment Management SA Pioneer Power Club Pioneer Primary School Singapore) Pioneer Public Television Pioneer State Recreation Area Pioneer String Quartet Pioneer Theatre Company Pioneer Total Abstinence Association of the Sacred Heart Pioneer Trails Regional Museum pioneer tunnel Pioneer Valley 8 Pioneer Valley Aquarium Society Pioneer Valley Baptist Church Pioneer Valley Building Trades Pioneer Valley Enterprise Program Pioneer Valley Food Factory Pioneer Valley Growers Association Pioneer Valley High School Pioneer Valley Hiking Club Pioneer Valley Jewish Film Festival Pioneer Valley Junior Soccer League Pioneer Valley Kennel Club Pioneer Valley Knife & Tool Pioneer Valley Libertarian Association Pioneer Valley Life Sciences Institute Pioneer Valley Montessori School Pioneer Valley Performing Arts Charter Public School Pioneer Valley Planning Commission Pioneer Valley Radio Association Pioneer Valley Roller Derby Pioneer Valley Sustainability Network Pioneer Valley Symphony Orchestra and Chorus Pioneer Valley Transit Authority Pioneer Venus Gas Chromatograph

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