Materials needed to build gold farm in the overworld:
- Flint and steel
- Water bucket
Make a room that has a 2-high wall around it. On each end, put down buckets of water going across. Where the water meets in the middle, dig down by 1 and put signs going across. This is to stop the water from flowing into the hole.
Under the signs, dig down by 23 and make a room any size you want. Under the signs, connect hoppers to a chest. This way the gold will automatically filter into the chest.
Come up as high as you want from the room with the water and start building nether portals.The more you have, the more gold you will get. You will need to have a lot of obsidion so I would recommend making an obsidion generator or taking away the obsidion towers in the end.
Attach trapdoors to the nether portals and then ignite the portals.