Is what is usually called a well. Is any required diameter, depth for ventilation, or bringing up ore. After drifting has progressed, shafts are required as ventilators, to free them from the smoke of blasts.

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[Source: "Glossary of Miners'&Mineral Terms" in St. John, John R. A True Description of the Lake Superior Country ... (New York, W. H. Graham, 1846).]