The Grandview mine, located below the South Rim on Horseshoe Mesa, is perhaps the most thoroughly studied for its copper minerals of the Grand Canyon mines, but appears to be representative of all the other old copper mines. Ore from the Grandview mine in the late 1880's was brought up the trail by mules and burros--each mule carried a load of about 200 pounds and could average a trip and a half per day down and up the 2,500 feet of vertical relief. The Grandview ore was of high quality-one piece of ore was reported to have contained 70% copper and weighed over 700 pounds. It was placed on exhibit at the World's Fair in Chicago in 1893.
It became a famous trail.