During the most recent production period to May 10, a total of 72.81 carats, from 62 diamonds were produced, placed on tender in Kimberley and sold with an average price of US$1,022.53 per carat, the firm said.
This included a 9.4-carat diamond, which sold at US$3,085 per carat.
Diamond production from Oena, since acquisition, including production from both run of mine (ROM) material as well as pan tailings, now totals 1,866 carats that have been sold at an average price of $1,117 (U.S.) per carat.
A total of 25,860 tonnes of both ROM and tailings material were processed during the most recent production period.
Tango shares stood at C$0.030 in Toronto.