الصفحة الرئيسية > Term: not previously known to exist
not previously known to exist
These words refer to the time of the location and commencement of the tunnel and not to the respective times of the discoveries of the various veins in the tunnel.
- قسم من أقسام الكلام: noun
- المجال / النطاق: التعدين
- الفئة: تعدين عام; Mineral mining
- Government Agency: USBM
0
المنشئ
- ed.young
-
(V.I.P) 21084 النقاط - 100% positive feedback
(Milwaukee, United States)
