So, the Company says they will be targeting 1-2 tonnes a day,...

So, the Company says they will be targeting 1-2 tonnes a day, which is 365 to 730 tpa, lets go middle road, 500tpa, so you reckon they are wrong and they will transport and treat 50 times as much, fairy nuff, lets say they stuff up and send 1,000 trucks instead of 20, easily done.
You then say it will cost them $3.65m to mine and treat 25kt, which is $146t. To do this they need to move the "ore" about 2,500km, along rivers and jungles and then the Amazonian highway. In WA, highway haulage costs between $0.10 to $0.15tkm depending on the distance and if your hauling with triples or quads, 90t or 120t. If you look at $146t / 2,500km = $0.0584, so you won't even get the material to the pilot plant let alone treat anything, unless of course the local trucking companies pay you for the privilege of transporting your ore.
Maybe the fairies will help move the ore, they should cause they sprinkled the invisible golden fairy dust there in the first place...

It's getting close to a year since they have finished drilling and have only managed to "assay" about 10 samples, I can't believe everyone can find this plausible.

Tubber