A hydrothermal mineral deposit formed within about 1 kilometer of the Earth's surface and in the temperature range of 50 -- 200 degrees Celsius. Also used to denote the environment of deposition.
Hydrothermal system formed within 1 kilometer of the earth's surface, in the temperature range of 50-200° C.
Mineralisation which is formed at low temperatures (50-200 °C) near the Earth’s surface (1500 m);
A hydrothermal ore deposit formed at lower temperatures (50-200oC) and depths (1km)