Lorong-panjang mundur ( longwall retreating )

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Lorong-panjang mundur ( longwall retreating ) merupakan Metode penambangan lorong-panjang yang permuka kerjanya mulai dari batas cadangan menuju lubang bukaan utama atau pengangkutan utama; sin. Dinding-panjang mundur

Cari Istilah Geologi Tambang


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