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Updated: May 17, 2025
In average hard-rock mining, from three to five of these holes are drilled in a space four-by-six feet in area. A stick of dynamite is exploded by inserting in one end of the stick a high-power detonating cap which will deliver a twenty-pound blow per X whatever that means. From three- to six-X caps are used in ordinary mining. Three-X caps sometimes fail to explode a stick of dynamite.
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