Complex sentence: The epithermal gold deposits occurring in the Sanpoil volcanics terminate directly below the unconformity where the volcanics contact the Klondike Mountain Formation or sometimes hydrothermal sinter deposits are known from the lowest portions of the formation and are thought to represent hydrothermal eruption areas.
Split into simpler sentences: The epithermal gold deposits occurring in the Sanpoil volcanics terminate directly below the unconformity where the volcanics contact the Klondike Mountain Formation or sometimes penetrate into the the lowest unit. Hydrothermal sinter deposits are known from the lowest portions of the formation and are thought to represent hydrothermal eruption areas.