Here is one somebody prepared earlier. This would be the subject of a study down the track or this report could be reviewed for a quick assessment. This was done in 2013.
https://itafos.com/site/assets/files/1773/itafos-araxa_technical_report_final-.pdf
As far as I know Araxa has looked at extraction of REE in studies but has not implemented on a process plant that could extract REE in addition to Niobium.
Here is one somebody prepared earlier. This would be the subject...
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