Ann: Outstanding REE Results from Roadside Drilling at Murraydium, page-9

The total rare earth oxides (TREO) concentration in parts per million (ppm) for major rare earth element (REE) discoveries can vary widely depending on the specific deposit, location, and the mix of rare earth elements present. There is no one-size-fits-all answer, but I can provide a general range based on some historical examples:

• Low-Grade Deposits: Some REE deposits are considered low-grade, with TREO concentrations in the range of a few hundred to a few thousand ppm.
• Medium-Grade Deposits: Medium-grade REE deposits might have TREO concentrations ranging from a few thousand to several thousand ppm.
• High-Grade Deposits: High-grade REE deposits are those with TREO concentrations well above several thousand ppm, often ranging from tens of thousands to over a hundred thousand ppm or more.

Notable deposits with relatively high TREO concentrations include the Mountain Pass mine in California, the Bayan Obo mine in China, and the Mount Weld mine in Australia.

It's important to note that the overall economic viability of a REE deposit depends on various factors beyond TREO concentration, such as the specific rare earth elements present, mineralogy, processing costs, market demand, and environmental considerations. Additionally, advancements in extraction and processing technologies can make lower-grade deposits economically viable in certain circumstances. Therefore, the TREO concentration alone is not the sole determinant of a major REE discovery's significance or economic potential.

DYOR