Mule Mountains, a mountain range located in Cochise County , Arizona (near Bisbee ), are a mountain range in southern Arizona that runs north to south. These mountains, along with numerous other remote mountains in Arizona, New Mexico, and northern Mexico, create so-called "Sky Islands," which have a significant amount of biodiversity and endemic species of their plants and animals due to their lengthy isolation. skuarua , CC BY-SA 2.0 , via Wikimedia Commons They have long been recognized for their extensive mining history, which played a major role in shaping the Bisbee Arizona history known today. The tallest point is Mount Ballard, reaching 7,500 feet. Over the years, copper, silver, gold, and lead were all mined from the mountains. Most notably, the Copper Queen Mine was once the largest copper deposit in the country, turning Bisbee into one of Arizona’s most prosperous towns. Even turquoise, renowned for its color, was dug from the Mule Mountains. Before the day...