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from grand exchange ~1.6k
Tin - 35 gp Copper - 70 gp Iron - 102 gp Coal - 174 gp Mithril -224 gp Adamantite - 1,039 gp Runite - 15,700 gp
In my opinion it is a mithril scimitar.
Copper, to make Bronze.
In the Dungeoneering minigame. Where they spawn is random.