Definitely case by case. Spodumene is easily altered and lithium is highly mobile, so any weathering of the spodumene will significantly affect the grade. In the above table, they mention fresh pegmatite however they don't mention how much so ambiguity number 1. Ambiguity number 2 is accuracy of the 20%+ spodumene claim. Ambiguity number 3 is how homogenous is the spodumene estimate throughout the whole pegmatite?
If it's all fresh spodumene, it has an 8.03wt% Li2O, so completely unaltered pegmatite with 20% should come in at 1.6% Li2O.
20% / (1 / 0.0803) = 1.6%
30% = 2.4%
Realistically, it's moderately safe to assume that, if their estimates are correct, it should be greater than 1% Li2O (37.5% margin of safety on the guess). The question is, how correct is their estimate? 24m at ~1.6% doesn't sound all too bad, but 200m is too deep until they find something closer to surface.
Definitely case by case. Spodumene is easily altered and lithium...
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