Eiyuden Chronicle: Rising – How to Complete Yash’s Gold Rush Part 2 Quest

The game says that the item you need is in the room directly above the lode golem room in the quarry…

Guide to Yash’s Gold Rush Part 2 Quest

All credit goes to watcherzero!

Firstly

You need to equipped a high level Prospectors accessory and/or the rare drop chance increasing accessory on the charachter breaking the veins.

Also

The other possible location is the room at the end of the top floor, two floors above the fishing spot where there is a maze of of wooden platforms and at once you successfully navigate the maze two gold veins and a large chest.

Note: its a unique vein spawn next to the two gold veins in the in the top left of the room that above (same room as the mob that drops a glass jar).