Almonty indicates quite nicely what their payables are they...

Almonty indicates quite nicely what their payables are they receive from customers (see in their previous quarterlies), variations across the industry should be minimal.
Customers pay the WO3 content and may deduct some small money depending on impurities - while thresholds apply, the concentrate grade has minor influence on unit pricing. Please also consider that APT (price reference) is not containing 100% WO3 (but only 88,5% WO3), so logically if an APT producer pays more than 88,5% of APT price for each WO3 unit, then they make a loss - so not very realistic.
DYOR