Fly Geyser

Fly Geyser, also known as Fly Ranch Geyser is a small geothermal geyser located on private land in Washoe County, Nevada approximately 20 miles (32 km) north of Gerlach. Fly Geyser is located near the edge of Fly Reservoir in the Hualapai Geothermal Flats and is approximately 5 feet (1.5 m) high by 12 feet (3.7 m) wide, counting the mound on which it sits. 

The source of the Fly Geyser field's heat is attributed to a very deep pool of hot rock where tectonic rifting and faulting are common. Fly Geyser was accidentally created during well drilling.The well may not have been capped correctly, or left unplugged, but either way, dissolved minerals started rising and accumulating, creating the travertine mound on which the geyser sits and continues growing.

A five-foot jet of water is constantly expelled from Fly Geyser into several terraces that discharge water directly to 30-40 travertine pools over an area of 30 hectares. The brilliant color of the mound is due to the presence of thermophilic bacteria, although several concentrated minerals are also present.

 

 It is 12 feet tall if you include the continuously growing mount on which it sits. It is privately owned by Todd Jaksick, the owner of Fly Ranch, meaning that visiting without permission is considered trespassing. 

Sources : wikipedia & Google Images