File:6.png

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Revision as of 20:19, 5 February 2015 by RTkachenko (talk | contribs) (Longitudinal view of a top-down extraction sequence, permanent pillars, and retreat to a central crosscut, no fill.)

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6.png ‎(517 × 246 pixels, file size: 39 KB, MIME type: image/png)

Longitudinal view of a top-down extraction sequence, permanent pillars, and retreat to a central crosscut, no fill.

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current20:19, 5 February 2015Thumbnail for version as of 20:19, 5 February 2015517 × 246 (39 KB)RTkachenko (talk | contribs)Longitudinal view of a top-down extraction sequence, permanent pillars, and retreat to a central crosscut, no fill.
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Horizontal resolution 37.79 dpc
Vertical resolution 37.79 dpc
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