I was predominately underground were the going rate is 100/m....

I was predominately underground were the going rate is 100/m.
surface drilling in aus would be close to the 300/m mark.

I haven't looked into great detail the ground from a drilling perspective yet which can obviously cause a blow out of costs/delays.

the first 100m is time consuming I.e drilling clays and muds and then casing off the larger diameter drill rods. (PQ,HQ) until you hit competent rock and start drilling with NQ. If the ground permits you can drill and retrieve 6m lengths which speeds up the turn around.

I will look into prior announcements for core samples etc. the more broken, fractured it is the smaller amount of core you will retrieve each time increasing the turn around.

I don't have a strong background in geology we just know what's hard and soft and easy/and or shit to drill haha. I drilled for numerous metals and the ground has always been better and more competent when drilling for gold.

my two cents.