Core DrillingCore drilling versus reverse circulation drilling is starting to show higher grades in the twinned holes. Maybe the sample size isn't large enough to call it conclusive but 5 out of 6 comparisons is a good start, especially in the low grade material.
Channel won't twin every hole, but will do enough to get a statistical correlation that wil help in defining the resources from the places core drilling infills and steps out from the RC holes.