File:OldRoomAndPillar.png
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:08, 20 July 2009 | 1,313 × 837 (174 KB) | Douglas W. Jones | {{Information |Description={{en|1=Origional caption: "Fig. 25. Method of Working the Georges Creek Big Vein, 1850." This illustrates room and pillar mining in its primitive form. There is no obvious ventilation planning, and both pillar sizes and head |
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