الصفحة الرئيسية > Term: pillar drive
pillar drive
A wide irregular drift or entry, in firm dry ground, in which the roof is supported by pillars of natural earth or by artificial pillars of stone, without using timber.
- قسم من أقسام الكلام: noun
- المجال / النطاق: التعدين
- الفئة: تعدين عام; Mineral mining
- Government Agency: USBM
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المنشئ
- ed.young
- 100% positive feedback
(Milwaukee, United States)