Ann: Additional High-Grade Gold Drilling Results at Comstock Gold, page-15

For the numerically literate amongst us:
Diamond - all in (including supervision & assay) $150/m
R/C - all in $70/m

OR

Fixed cost of running a rig (of any flavor) is around $10,000 to $14,000/shift, depending on finance, so divide that by, say 120m/shift for RC and say 30m/shift for DD; add assays + supervision.

If they claim to own the rigs or are using a one-man-band contractor, you can add at least $30% to that,

Fixed costs of supervision will be between $1M and $2M/year.