Aurum Geyser, Cone geyser in Yellowstone National Park, United States.

Aurum Geyser is a cone-shaped geyser in Yellowstone National Park that shoots hot water through a vent built up by mineral deposits over time. The eruption can reach approximately 25 feet (8 meters) high and results from water heated under pressure in underground channels beneath the cone.

Aurum Geyser sits on Geyser Hill in the Upper Geyser Basin of Yellowstone National Park. Its eruption intervals have been observed to follow the moisture of the meadow behind it: roughly 3 to 4 hours between eruptions when the meadow is wet, and 4 to 7 hours when it dries in late summer and early fall. It also takes part in the weekly Geyser Hill wave, shortening and lengthening its interval at regular times over a week.

Aurum takes part in the weekly Geyser Hill wave, shortening and lengthening its interval at regular points in the week. Its name comes from the Latin word for gold, after the yellow mineral staining around the vent. The German Wikipedia notes it can usually be watched on the Old Faithful webcam, where it looks rather inconspicuous.

Aurum can be watched live through the Old Faithful webcam, where it is fairly inconspicuous. On site, bubbling in two small vents beside the main cone usually announces an eruption about half an hour in advance. Intervals run 3 to 4 hours when the meadow behind is wet, 4 to 7 hours when it dries in late summer and early fall.

Aurum's interval follows the meadow behind it: when the ground is wet, eruptions come every 3 to 4 hours; when it dries in late summer and early fall, the gap stretches to 4 to 7 hours. It also joins the weekly Geyser Hill wave, shortening and lengthening its interval on a regular cycle.