Stellar holds a 14km² Semi Industrial mining license in south east Guinea, covering a high grade alluvial deposit which can be attributed to the erosion of the surrounding Bouro kimberlite dykes.
Between 2009 and 2011 Stellar mined some 128,000 carats at a grade of approximately 31 cpht with sales of US$3.9 million being achieved. The diamonds from Mandala are mostly of so-called “Indian goods”, with a relatively low average value of approximately US$35-45 per carat. However, the component of quality of the gem goods is high with some good whites and fancies being valued at between US$2,000 to US$4,000 per carat (including a 36 carat yellow stone valued at US$150,000). Stellar placed Mandala on care and maintenance in 2011 due to prevailing weak diamond prices.