If angels petrochem is installed, madclowns processing and thorium get an error on startup. Installing madclowns extended minerals fixes this bug again. As a side note, I used to play without the exntended minerlas mod, but now, as just said, its broken.
23: Error in assignID, item with name 'clowns-ore3-crystal' does not exist.
Source: thorium-pure-processing (recipe).
7.032 Loaded shader file C:/Program Files (x86)/Steam/steamapps/common/Factorio/data/core/graphics/shaders/game.cso
7.032 Loaded shader file C:/Program Files (x86)/Steam/steamapps/common/Factorio/data/core/graphics/shaders/zoom-to-world.cso
7.032 Loaded shader file C:/Program Files (x86)/Steam/steamapps/common/Factorio/data/core/graphics/shaders/alpha-mask.cso
7.035 Initial atlas bitmap size is 16384
7.038 Created atlas bitmap 192x5 [none]
7.038 Created atlas bitmap 132x24 [no-crop, trilinear-filtering, icon, light]
7.060 Sprites loaded
7.060 Convert atlas 132x24 to: trilinear-filtering
7.067 Custom inputs active: 4
7.069 Factorio initialised
7.070 Mods to disable:Failed to load mods: Error in assignID, item with name 'clowns-ore3-crystal' does not exist.
Source: thorium-pure-processing (recipe).
Mods to be disabled:
• Clowns-Nuclear
• Clowns-Processing