The more nuggety a deposit is the harder it is to analyse the grade. For instance if one tonne has a grade of 10oz (310gm) but its all in 1 single nugget then finding that nugget is tough. When one takes a sample from a tonnage to supply to the lab how do you know you got the nugget? So your few grams will either analyse at zero or 10s of thousands of grams. See how risky it is - hence non JORC. The lab only digests or fire assays a few grams. One must sample out of the one tonne down to a few grams. Therein lies the problem analysing nugget deposits either by drilling, bulk sampling, head grade sampling, tails sampling etc. One cannot treat these type of deposits like bulk low grade homogenous disseminated deposits (Super pit) where every few grams hold exactly the same amount of fine gold. The only way to sample these deposits accurately is to mine and process them. Its a complete fools game to say we got such a grade. One should provide all the info (where is the JORC Table 1?) They should provide the total tonnes and grade fed in, the total tonnes and grade recovered, the total tonnes and grade that went to tails (all according to lab analysis). Then do a back calc of the tonnes and grade of both product and tails to see if it agrees with the feed. This is a mass balance. Commonly nugget deposits mass balances can be out by many orders of magnitude. One asks why just provide the results of the apparent product without all this other necessary data? Where is JORC Table 1.
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