I thinking about; 45% research/location, 35% operator experience and time with a machine and 20% machine. I also think do to variability in these categories % can be modified +/- 10 % maintaining the 100% total.
IMHO: Being a scientist I do not believe in luck...all my "luck" in work and life has been created by hard work.
If you want consistently good results (completely different from the odd good find) you need to eliminate Luck completely. Cru'dad & I only use the word Lucky if we wonder back to the car & get the best find or if we are scouting (wandering) a field & get the best find straight off with no gridding.Just curious, I’m thinking 80% research, 20% luck.