If you look into the costs of drilling you will see that to...

If you look into the costs of drilling you will see that to drill diamond core, log, cut and assay, the price is around $200/m, and that is for shallower drilling, say to 300m depth. As a drillhole gets deeper, the cost per metre increases. Drilling contractors charge different rates for different depth ranges. Directional and navi drilling are even more expensive. ($750,000 IMO for a hole is way over the top, but deep diamond drilling will chew through the $ pretty quickly)