Tin, page-79

https://www.oecd.org/tax/tax-global/case-study-mineral-product-sales.pdf

just as aside, got to be cautious with the pricing. if they ship a ton of concentrate it doesn't equal a ton of tin i,e spot price. If you ship concentrate of 63% tin, then you'll get 63% of spot minus smelting royalties and other prearranged fees. the smelters only pay for present material, which is why the grades in concentrates is very important because if you're too far under the agreed grade (varies wildly on different minerals) then its not worth the cost to smelt it after fees.

So forward calculations should reflect this.

I suspect the original shipment fell under agreed grades, hence the strategy change, no news on the shipment and the appointment of an independent assay company for future shipments. Not poking holes, it is what it is and they learnt where the bench marks are and will adjust accordingly. but this may offer some insight why i spat the dummy at the first production ann.

So in the upcoming production anns keep an eye on grades. bad recoveries can always be dialed in and its never a show stopper because you can scoop it up and reprocess later... but grades are what you should hold managements feet to the fire on as that is the bankable stuff. some ore is just a prick to work with and can be challenging to get consistent marketable grades....takes time, which may explain the slow news cycle.

just another 2cents worth