You must be joking. Personally, I believe Bob's number to be conservative based on what is being reported. 75% is goofy. With the over-burden removed and you are in the iron body there is very little waste. The drilling process would be stopped if they were coming back with 75% waste. What is being reported is that they are hitting magnetite and some hematite. It appears that all of this is usable as either ore for shipping, super fines to go through a benefication process to be pelletized for shipping, super-super fines for use as fertilizer and some of the remainder going to Cemex. That leaves very little for waste. But I will use Bob's number of 15%.
As to the in ground value of iron ore, I don't know the actual value which is right. I will leave that to the more knowledgeable, but I seriously doubt that BAO or any legitimate interested party is looking at a value of 5-10 cents per ton.
If you want to bash the company or management, why don't you focus on the legitimate issues revolving around audited financials, uplisting, CE removal, i.e., those issues which way overdue from when promised.
Bob is doing a fabulous job in building the operational aspects of the business. Period. One can only hope that the promised transparency comes soon.