I'm trading my mythril for your miscellaneous ore in the following format:
# of Mythril ore stacks in stock: 32
Ore ___________________ Exchange rate
Iron ore fragment_____________2:1
Silver ore fragment____________2:5
Copper ore fragment__________3:1
Unknown ore fragment_________12:1
For example, if you want to trade me iron ore fragments for mythril ore fragments, which has an exchange ration of 2:1, you will need to give me 2 stacks of iron for every 1 stack of mythril.
Edit: Buh, did I post this in the buying section? It should be in trade and appraisals.
Note Rime on the Mari server if you're interested.