Mosaic Four Corners Mine, Florida

Mosaic’s Four Corners Mine is currently the largest of the active phosphate mines in the Bone Valley. It produces around 6.5 million tons of phosphate rock (out of a total of 15 million tons produced by the company globally). The mine covers 12,000 acres, and employs around 500 people. Mosaic has around 20 draglines in the area, and is using 8 of them at the Four Corners mine. The company says they are the largest earth-moving machines on the planet. They run on 72,000 volts of electricity, and have two operators. Mosaic owns and operates just about all the phosphate production in the Bone Valley, where 75% of the phosphate produced in the USA comes from.