Part of the text is below and it notes the compound Li2S (Lithium Sulfide). Wikipedia notes that Li2S easily hydrolyses in air to release hydrogen sulfide which has nasty properties including being poisonous, corrosive and flammable. Any flow sheet with a chance of creating a poisonous, corrosive and flammable gas is going to have above-average costs to make it safe.
The grade could also be a problem. The paper references 22ppm Li (or 47ppm Li2O). As context, Core's next deposit after Grants is BP33 at 1.53% or 15,300ppm Li2O. The explicit grade referenced in the paper is over 300x lower than that of BP33's ore. Prices for Carbonate and Hydroxide would need to be at absolutely crazy levels for processing of anything around those concentrations to be economic.
If grade and processing weren't enough of an issue, the article mentions 54% liberation. There may be recovery issues.
Overall I don't see this as being a economic threat.
Part of the text is below and it notes the compound Li2S...
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