Orichalcum Ore Where ore Where?
i got 50 for area completion once. my BF got silk for the same completion though, so it isn’t for sure.
Cursed Shore have 5 spawns,Malchor`s Leap-another 5,Frostgorge Sound -2 .Also 2 more including a rich vein in Obsidian Sanctum/Eternal Battleground.So plenty around although with long respawn timer.Just go to Cursed Shore for example and ask in map chat where are current spawns of ores-people will answer with link to closest waypoint/point of interest.After-go collect them and move to next area.Having 250 ores and 30ish ingots already without putting too much efforts to regularly gather all avaible spawns.
Pretty sure the spawn time is 5 hours. But the spawns shift quite regularly. At that rate you can pull at least (5+5+2+2)x3 = 42 orichalcum ores every 5 hours and even more if your server has the wvw buffs or you run across a rich node.
Even if you run the cycle to collect them once a day thats only 11-12 days to gather 500.