The mining sites are situated at the edge of the Yadanar-kaday-kadar
mine facing the Kabaing valley. In mid-1990s the gems concessions were worked intensively and produced transparent rubies
of faceting grade. Star rubies
and star blue sapphires
of all qualities and sizes were often found. In 1993 a 50-carat silky ruby was the most valuable gem found in this mine. Low quality, silky, translucent to opaque, cabochon-grade rubies and blue sapphires are frequently recovered, some of them up to 300 grams.
Blue-pink parti-colored opaque sapphires
are found. Color-shift sapphires are frequently encountered that appear blue in daylight and pink by incandescent light, but true color-change sapphires are never found. Most of these sapphires are of low to medium quality, opaque to semi-translucent, most suitable for cutting into cabochons. Few gems are transparent enough to be faceted, most of these small in size (less than 2-3 ct). Some of zircons
are large and of high quality.
These gems are recovered in a small-scale open-pits, using pulsating jigs. In 1999 there were 5 joint ventures mining ruby and sapphire from the alluvium. In 2002 the mine was closed.
Ref: Ted Themelis (2008) Gems and Mines of Mogok, p. 262