Ann: Lyons 12 & 13 Drilling Extends High Grade REE & Niobium, page-41

High-grade NdPr (Neodymium and Praseodymium) deposits are typically defined by their percentage of NdPr content in relation to the total rare earth oxide (TREO) content. A deposit is considered high-grade if it has a high proportion of NdPr compared to other rare earth elements. Generally, a deposit with a NdPr content of around 15-20% or higher of the total TREO is considered high-grade and economically viable for prospective mining. Keep in mind that economic viability also depends on factors like extraction costs, market demand, and overall mineralogy.

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