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Goldstrike

07/24/14 1:17 PM

#65175 RE: RD759 #65170

Your post actually became pretty clear to me after my morning coffee. By "firing" for example, you mean an explosive charge.
Long story short, the economical open pit excavation of a shear zone would resemble something like an upright fork, the tines being the uneconomical gangue left behind.
Such an excavation would require an improbable shoring technique.