I didn't really explain that "2 year period for conventional mining per se" too well. The ore that can very easily/cheaply excavated will quickly be turned into the reserves category (that's essentially what this category is, known ounces and the economics of their production). The rest of the mine's (conventional) ore bodies can be initially categorised into inferred and indicated categories. I don't think that will be a big focus with BMV until later on in the process (1-2 years maybe).
A conventional miner might be more inclined to drill out all of the prospective wall faces and create a model where they can show the market they have X hundred thousands of ounces, raise money, JV, borrow a 100 million for a huge plant etc. That's normally the focus of feasibility studies for orthodox companies and this would take at least a couple of years to complete for a mine as immense as Gubong.
Not BMV and SAU though,
@Mr Kodal. As you mention, they want this done as quick and cheaply as possible.