RE: Stockpile - Valuation8 Jun 2020 23:05
I've got more evidence than this, but have a read of this for starters:
"The Platform for Cooperation on Tax" (2017)
https://www.un.org/esa/ffd/wp-content/uploads/2017/01/tc-info-gaps-prices-of-minerals.pdf
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Box: Published Prices and Contract Prices
In the financial press, the iron ore price is frequently quoted as referring to a dry tonne of iron ore fines containing 62 percent iron (“fe”) delivered by sea to Qingdao port in northern China.
However contracts are frequently concluded using different price metrics, such as US cents per metric tonne unit (mtu) of ferrous content. Concentrates for example are frequently priced on this basis. This means conversions may be required to compare such contracts with published “iron ore” prices.
Take as an example, a contract for 50,000 tonnes of concentrate with 64 percent iron, priced at 70.31c/mtu also going to Qingdao on the same delivery terms.
After converting the price to dollars, it is adjusted by the Fe content: 0.7031*64 = $45/tonne (since in this case there are 64 units of iron in each 100 units of the concentrate). Depending on how it is expressed in the contract, this may be the price per tonne including moisture (“wet” tonne). To compare against the published dry metric tonne price, the price needs to be adjusted to remove the weight of moisture. Continuing with the example, For example, if the shipment had 8 percent moisture, the price is adjusted as: $45*0.92 = $41.4 per dry tonne.
For the purposes of freight, wet tonnes are the relevant metric since this is the weight that must be physically transported (ArcelorMittal, 2016).
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