Not concerned about the 5m as its likely a vein system, so we...

Not concerned about the 5m as its likely a vein system, so we need to chase down the veins at depth. And as regards using pXRF for preliminary assaying, as another posted mentioned, historically there does seem a good correlation between pXRF and lab assays for these kind of silver systems. If we do have massive or semi-massive silver bearing minerals within vein structures then pXRF of these areas will give an very close approximation to what lab assays will show. Just like, for example, pXRF results on massive or semi-massive copper sulphide intersections as reported by copper explorers.