Rubyvale Fossicking area, Anakie, Central Highlands Region, Queensland, Australia
The sapphire-bearing alluvium near Rubyvale is a paleovalley deposit extending in an east-west direction and locally reaching 800 m in width. The alluvium has a thickness of up to 2 m. In the eastern (upper) part of paleovalleys, the thickness increases to 3 m and locally to 10 m. It contains fragments of basalt and weathered feldspathic sand.Ref: E.Ya. Kievlenko (2003) Geology of gems, p. 68