The announcement on the MDMN web site says the assay is from LDM/NUOCO workings; you're obviously better informed than the guy updating the site.
Experts who say a deposit is open-pittable before a single drill hole has been completed, before the tonnage and grade is known, before the alteration shells and oxide/transition/primary sulphide zones are identified and modelled, before an NI-43-101 is done and before a definitive feasibility study has confirmed the fact and the start up funds are in the bank, are , frankly, no experts.
Even if structures merge and are continuous it doesn't follow that economic grade mirrors those facts. Only by block modelling the deposit and then coming up with a logical block extraction plan can you design a viable pit.
Drilling is expensive; it would be better to map the plateau at a small scale and then complete a geochemical and geophysical program to identify and rank surface and near-surface anomalies so that the best targets are drilled first and you get maximum cost benefit from your drill budget. Just firing holes into the first targets that look good isn't that good an idea.
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