I need links to free daily/weekly updated prices of tantalite/tantalum.
There is no open market for tantalite/tantalum like LME for tin or nickel. 

This is how it works: "There are no published prices for tantalum
metal or intermediate chemicals so it is therefore very difficult to
determine the price of tantalum. To gain a better understanding of how
price is determined, one must review the market supply and demand. As
with most items, price is determined through equilibrium of supply and
demand".

But somehow market prices are moving weekly and somehow it might be
reflected somewhere...
 
One good site http://www.metalprices.com used to give free access
before but for the last 2-3 years they offered this information under
subscription.

I've been looking for a relevant information  trying to use different
search engines, different keywords but did not find any good sites.

Thank you in advance