The Gekko plant, (VSI, Knelson Concentrator, shaker table and spinners and gold table etc) was tested several times by professionals as performing very well.
There were a few minor improvements, but essentially the problem was always the feed of the gold ore as a result of dilution AND lack of supply.
Efficiency will be MUCH lower if you are feeding the plant 3 g/t compared to 8 g/t, and it is not a sliding scale (Metalurgical Study).
Why did management do everything they could to make sure that no economic gold was produced (although they loved to talk about it)?