Elementalist Whirlpool and Orichalcum veins
I posted this 2 months ago and it’s still a bug in the game.
While on my engineer now with the trait “Cloaking Device” If i’m harvesting Orichalcum and a monster triggers the stealth trait all the ore I try to collect becomes “Ruined Ore” While using Orichalcum mining picks.
I think this has to do with the game code for “transformations”. Basically, whenever a skill, trait or item transforms you into something else, apparently all your equipped weapons are temporarily replaced by some kind of default equipment.
(As an elementalist, I once received an achievement for “number of foes killed with a sword” while transformed by the Tornade elite skill. Elementalists can’t even hold swords!)
I am assuming that transformation does something similar to your harvesting tools.
Interesting question:
Did your Orichalcum Mining Pick use any of its charges during your attempts? If not, then it would support the theory above.