For the past 6+ years, I have supervised numerous projects that involved planning exploration and supervision of drilling. For most of the coal projects, it is very important to prepare accurate geologic, geotech and fracture (RQD) logs; take photographs of the core and perform depth correction to the geophysical log if available.
I have seen so many different kinds of drills with different capacity. Some of the old core drills still does not have a wireline component. They are slow. Most of the newer drills are equipped with the core barrel attached to the wire line where you do not need to pull up entire drill rods to recover the core.
I have recently been to site that has a pretty new mobile drill. The drill is manufactured by Mobile Drill International. Visit http://www.mobiledrill.net/ for more information about their products.
Ankan Basu, P.G.