Hey hawnkoa,
Personally I don't put any value in the moving of reserves to be honest. I've probably studied in depth about 100 deposits and never even once have I seen the ounces decline when bumping them up to the next category. I've seen this notion floated around this board to the importance of doing so, but imo it means notta. Any eventual suitor has everything they need in terms of size of the deposit to make a bid. Wherethe proven category would come into play would be a bankable feasibilty study required to get financing for mine startup.
But to answer your question I would guess that 550m (l) by 150m (w) by 250m (d) envelope would require probably some 120+ holes to move it to the proven category. Once the ramp is in, this would take about 240 days (hole every 2 days) with one drill.
Regards,
Buck