| On June 3rd, 1948, a blast rocked the
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| | sledge hammer, then rotating the drill
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| Black Hills of South Dakota. Ten tons of
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| | and banging it again until the hole is
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| stone were dislodged from the
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| | finished. It is a labor-intensive effort
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| mountainside and tumbled to the earth
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| | and a single man might only drill six to
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| below. Earlier that day, a man named
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| | eight feet over the course of a day.Over
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| Korczak had ascended the mountain and
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| | the following years more than eight
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| single-jacked four holes at 6,740 feet
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| | million tons of rock would be blasted
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| above sea level.Single-jacking is the
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| | away. What was once a silent silhouette
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| practice of placing a drill-bit against
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| | in stone began to take on a new shape.
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| hard rock, slamming it with a four-pound
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