OPENING-UP, DEVELOPMENT WORK (MINING)
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BTMINING OPERATIONS + EXPLOITATION, WORKING OF MINERAL DEPOSITS (MINING)
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UDC622.22
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Descriptor GERAUFSCHLIESSEN + AUFFAHREN IM BERGBAU (BERGBAU)
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Descriptor ENGOPENING-UP, DEVELOPMENT WORK (MINING)
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Descriptor FREPRÉPARATION + TRAVAUX DE DÉVELOPPEMENT (INDUSTRIE MINIÈRE)
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Variant GERAUFFAHREN IM BERGBAU (BERGBAU)
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Variant ENGMINES/OPENING-UP, DEVELOPMENT WORK
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Variant FREOUVERTURE/DE MINES (INDUSTRIE MINIÈRE)
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Variant FREMONTAGE/DE MINES (INDUSTRIE MINIÈRE)
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Variant FREAMENAGEMENT/DE MINES (INDUSTRIE MINIÈRE)
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Variant FREOUVERTURE + AMENAGEMENT + MONTAGE (INDUSTRIE MINIÈRE)
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NTABANDONED MINES + REOPENING + RE-EQUIPING (MINING)