Ann: Mustang to Export a Further 25,000ct of Gem Quality Rubies, page-93

An important note to make is that MUS is only in initial bulk sampling stage. The fact that they are able to generate any revenue from a bulk sampling survey over lease is quite remarkable! Just think of how rich and profitable there deposits are if they can generate positive good coin from an exploration program.
Like everything costs come down with greater processing rates and i can only imagine how low their operative $/ct cost will be when they transition into full scale production.

GLTA