What??! First of all, they didn't have "much more than one ounce of gold left after concentrating". Even by your own twisted logic, if the assay of the original 50 pound sample was 2.925 oz/ton, there was only 0.07 oz in that original 50 pound sample. So how could they have "more than an ounce of gold after concentrating"?? Did the gold magically grow in weight? Is this sorcery?
You should stop while you're behind. And yes, you are a dumb dumb at sampling, analysis, and anything mining. You are not an expert. You do write well, and I bet you have written some great PRs in your time.