Before it became the world’s largest geothermal power-producing site, The Geysers was known as the “Gates to Hades,” drawing visitors with its healing waters, steam vents, and wild legends.
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Word of the Week – Drill Cuttings
Drill Cuttings Small chips of rocks (e.g., <1/8 inch or <3 mm) obtained during drilling with a rotary bit that...
Word of the Week – Enhanced Geothermal System
Enhanced Geothermal System Unconventional geothermal resources that contain heat similar to conventional hydrothermal...
Word of the Week – Epidote
Epidote Alumino-silicate hydrothermal mineral having a distinctive yellow-green color that is used a mineral...
Word of the Week – Felsic
Felsic A geological term referring to igneous rocks that are equivalent to rhyolite and granite in composition.
Word of the Week – Flowback
Flowback Return flow of slickwater that was injected during a stimulation. This is a highly controlled process in...
Word of the Week – Fumarole
Fumarole A steam vent and surface thermal feature that is commonly associated with steaming ground and mud pots in...
Word of the Week – Geochemical Tracer
Geochemical Tracer An environmentally benign chemical that is injected to trace fluid movement through the geothermal...
Word of the Week – Geothermal Gradient
Geothermal Gradient The increase in temperature with depth below the surface, usually reported in units of °C/km.
Word of the Week – Geyser
Geyser A rare type of hot spring that periodically discharges a fountain of hot water and steam (or sometimes just...
Word of the Week – Gneiss
Gneiss Metamorphic rock that forms under intense pressure and high temperature and that is made of quartz, feldspar,...
Word of the Week – Granite
Granite Light colored, coarse grained, intrusive rock with a felsic (silica-rich) composition that is mostly made of...
Word of the Week – Granitoid
Granitoid A generic term referring to hard, coarsely crystalline plutonic rock that is produced by intrusion of magma...