Guild Wars 2

So i have a question about the loot bags and their chance to give rare crafting materials..
The wiki says that rare crafting materials are Silvers, Fragments, Shards, Cores and lodestones (and the essences).. does this mean if i kill a level 80 champion ill be rewarded with a lodestone?

Yes, you have a chance to get a lodestone from killing champion monsters. That, along with a set number of T6 crafting materials in high level areas as means of compensation for the removal of magic find equipment in a later update (since most people like me have magic-find gear as means of farming T6 materials; here’s how expensive some ascended back items can be in terms of T6 crafting materials).

If you get lucky.

pave.6901:

does this mean if i kill a level 80 champion ill be rewarded with a lodestone?

It means you will have a chance to get lodestones, yes. That was specifically mentioned here:

ArenaNet

Champion Rewards

Champions in the game will be updated so each will always drop a guaranteed reward box for any player that qualifies for a reward from the boss. This chest will contain things like crafting materials, skill points, unique skins, lodestones, and more.