Looking at the resultsIt looks like the line of kimberlites heading NW from Star are all the lowest=grade pipes of the ones tested 134, 135, 116, 216, 118, 152, 218, 163). All the pipes heading north from Star West are the higher grade pipes (Star, 133, 140/141, 145, 219, 148, 147, 123, 223). I believe they probably already have enough data from 140/141 and 148 to determine grade, and they fit in line with the rest of these higher-grade pipes. So that Northerly line of pipes must have sourced from a better diamond-bearing zone at depth.