Rotorua, Wai-o-tapu Champagne Pool
this pool is 62m deep. its surface temperature is 74 degrees C and bubbles due to carbon dioxide. The pool was formed 700 years ago by a hydrothermal eruption. Minerals contained in the water include gold, silver, mercury, sulphur, arsenic, thallium and antimony. They are depositing in the surrounding sinter ledge.
A close up of the orange ledge is located here
Very informative and formative in it's beauty!-koduckgirl