相簿列表 » 20230513 Ｍuseum tours, New York, USA

These specimens, as well as the nearby Singing Stone, hall from Bisbee, Arizona. The Mule Mountains surrounding Bisbee were once home to high-grade copper ore bodies (高品質銅礦所在地). These deposits were formed during Arizona's tectonically active past (過去地質構造活躍時期) and enriched by descending groundwater that redistributed dissolved metals. Beneath the mountains' metal-poor surface, the Mule Mountains hid rich ores of copper, gold and silver.