Fly Geyser isn't a real geyser, but is the result of drilling a well and hitting hot water. It erupts continuously and has built up a cone of minerals around the pipes that were part of the original well about 100 years ago. The colors are from various heat tolerant microorganisms like those living in hot springs in places like Yellowstone.
Fly Geyser Erupts Continuously
Minerals Build Terraces Around Fly Geyser
By Standley White, About.com Guide
Fly Geyser surrounded by terraces created by minerals in the water.
Photo © Stan WhiteDesert and Wilderness User Groups
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