Perthro's Structures

Port from 1.20.1. There is only one difference in this version, that being the structures are slightly larger. 
Changelog from 1.20.1:

A massive update has been released.

NEW STRUCTURE - GOLD RUSH MINES!

The gold rush mines can be located in any badlands biome. You can locate them via a small dark oak outpost that has a rope leading deep into the mineshaft. There are several different sections of the mineshaft to explore, each area having a different appearance and lots of loot and gold to find. If you're lucky you'll even be able to find an enchanted iron pickaxe to help you out on your mining ventures!

Several Changes to the Gnarled Halls.
-Completely reworked generation to have way less tiny hallways and more big rooms.

-Changed the starting room that branches off into the other parts of the structure. It is much bigger which also gives the big rooms more space to generate

-You are now able to locate the structure by finding a big rotten tree stump in the forest, birch forest, and dark forest.

-Nerfed the amount of spawners that could generate.

-Hallways will try to generate a dead end if they reached the maximum generation depth

-Some additional cosmetic touchups to most of the rooms