Az's Mining Dimension

Az's Mining Dimension offers a copy of the normally generated overworld,
which serves as a mining dimension!

Long story short:

14 cobblestone just like you'd place it for a Nether Portal
1 Charged Amethyst to ignite the Portal!

Charged Amethyst is crafted by surrounding an Amethyst Shard with 4 copper ingots.

Once the Frame has been placed, light it with the Charged Amethyst, just as you would with a Nether Portal!

Tested in modded Environment - it sure does work!
Time is fixed at 6000!

1.0.1 

Added a Deepslate Mining Dimension

portal frame made of cobbled deepslate - ignited by Deep Charged Amethyst!