You are missing a factor of 0.7 from the conversion of niobium oxide mass, which is 70% niobium and 30% oxygen by mass, to niobium mass, resulting in 1.75 Mt ferroniobium by your other numbers.
WA1's estimated JORC resource, page-14
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$13.59 |
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Mkt cap ! $920.2M | |||
| Open | High | Low | Value | Volume |
| $13.48 | $13.75 | $13.27 | $1.679M | 124.0K |
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