Synopses & Reviews
Synopsis
Excerpt from Drilling for Placer Gold
There is yet another angle to the situation. In the event that preliminary work prompts a complete campaign of evaluation, the Keystone is absolutely necessary. And when the dredge is finally completed and at work, the Keystone has not outlived its usefulness. Modern practice suggests t the continued use of the drill in front of the dredge, blasting hard ground, determining the boundaries of barren areas, charting the pay-streak, seeking out reefs of hard bedrock, tracing the sub-surface bench line, even forecasting the cur rent dredge returns. A large dredging company now follow this practice, for, as they say, There is nothing more foolish or expensive than to prospect with a dredge
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