This mod adds 9 extra vanilla nodes and 2 stumps in The Mines and the Skull Cavern. By default they'll unlock after meeting their requirements, detailed below.
Spawning conditions are entirely configurable, and you can remove the unlock requirements by using GMCM or editing the config.json file.
If you don't want a particular node to appear, just set its spawn frequency to "0".
(Default balance is still WIP)

Coal Nodes :
- Unlocked after repairing the bridge to the Quarry.
- Chance to spawn on any floor in The Mines and the Skull Cavern.

Bone Nodes :
- Unlocked after repairing the bridge to the Dig Site on Ginger Island.
- Chance to spawn from floor 71 in "Qi's danger in the deep" version of The Mines.

Clay Nodes :
- Unlocked after repairing the bridge to the Dig Site on Ginger Island.
- Chance to spawn from floor 1 to floor 39 in The Mines.

Cinder Shard Nodes :
- Unlocked after reaching the Forge in the Volcano Dungeon.
- Chance to spawn from floor 50 in the Skull Cavern.

Omni Geode Nodes :
- Unlocked after reaching the Forge in the Volcano Dungeon.
- Chance to spawn from floor 81 in The Mines and from floor 1 in the Skull Cavern.

Iridium Nodes :
- Unlocked after finding iridium ore for the first time.
- Chance to spawn from floor 101 in The Mines.

Geode Nodes :
- Unlocked after reaching floor 40 in The Mines.
- Chance to spawn from floor 1 to floor 39 in The Mines.

Frozen Geode Nodes :
- Unlocked after reaching floor 80 in The Mines.
- Chance to spawn from floor 41 to floor 79 in The Mines.

Magma Nodes :
- Unlocked after reaching floor 120 in The Mines.
- Chance to spawn from floor 81 to floor 120 in The Mines.

Stumps :
- Unlocked after reaching Foraging skill level 3.
- Chance to spawn from floor 1 to floor 120 in The Mines.

Mossy Stumps :
- Unlocked after after experiencing your first Green Rain.
- Chance to spawn from floor 1 to floor 120 in The Mines.

Requirements : Item Extensions Framework & Content Patcher
This is compatible with Generic Mod Config Menu

Installation / Usage :
- Install the latest version of SMAPI
- Install the latest version of Content Patcher
- Install the latest version of Item Extensions Framework
- Extract the content of this downloaded mod zip file into your Mods folder
- Launch the game using SMAPI
- Edit the config.json file or use GMCM to configure the mod at your leisure