knot , i think the gold had too much overburden, and was too...

knot , i think the gold had too much overburden, and was too thin a section of mineralized material, like a layer of gold on an ancient river bed.
They possible dug down to the mineralized ore & placed it on the rom pad.
Then they dug up the thin mineralized layer and put it though the Gekko. But for all the effort it wasn't economic. Just a theory , because they didn't tell shareholders why they ceased mining Kat Gap

So Deano went back to his true love, Forestania , which geologically is a folding deposit & more amenable to mining.