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![Principles of mining : valuation, organization and administration; copper, gold, lead, silver, tin and zinc . Fig. 19. (Figs. 38, 39, 42). In such cases the main roadway can thenbe driven on Principles of mining : valuation, organization and administration; copper, gold, lead, silver, tin and zinc . Fig. 19. (Figs. 38, 39, 42). In such cases the main roadway can thenbe driven on](https://c8.alamy.com/comp/2AXF1NW/principles-of-mining-valuation-organization-and-administration-copper-gold-lead-silver-tin-and-zinc-fig-19-figs-38-39-42-in-such-cases-the-main-roadway-can-thenbe-driven-on-straight-lines-either-in-the-walls-or-in-the-oreand-used-entirely-for-haulage-the-subheading-for-a-stopingbase-is-driven-far-enough-above-or-below-the-roadway-de-pending-on-whether-overhand-or-underhand-stoping-is-to-beused-to-leave-a-supporting-pillar-which-is-penetrated-by-shortpasses-for-ore-in-overhand-stopes-the-ore-is-broken-directlyon-the-floor-of-an-upper-sublevel-and-in-underhand-stopesbr-2AXF1NW.jpg)
Principles of mining : valuation, organization and administration; copper, gold, lead, silver, tin and zinc . Fig. 19. (Figs. 38, 39, 42). In such cases the main roadway can thenbe driven on
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