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Minong Mine Historic District
The Minong Mine is a mine site located west of McCargoe Cove campground on Isle Royale National Park, Michigan, USA containing both the remnants of a 19th-century copper mine and remains of prehistoric mining activity.〔 It was listed on the National Register of Historic Places in 1977.〔
==Pre-historic mining==
Native Americans first began mining copper at the Minong Mine site 4500 years ago, using stone implements to extract the pure copper available at the site and cold-hammering the metal to form spear points and other implements. These prehistoric miners created pits, some as much as 30 feet deep,〔 that can still be seen at the site.〔 Some pits showed evidence of early engineering efforts, using boulders to support the walls of the pit and drains to remove water.〔 There was evidence that these ancient miners utilized fire-setting, where rocks were split by heating them with fire and rapidly cooling them with water to extract the copper within.〔
When re-discovered in the 19th century, the prehistoric excavations in the Minong Mine area were described as extending "in almost a continuous line for more than two miles, in most instances the pits being so close together as barely to permit their convenient working." A number of ancient mining artifacts were collected from the Minong site; primarily smooth cobbles used as hammers which were, it was said "collected by the cartload."〔 In addition, a fragment of a wooden bowl about three feet across, a wooden shovel, and a rawhide string were also discovered at the site.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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