Minecraft – Using the mod “Armoa’s Core 1997’s Dimensional World” How do i change the mining world “y” height

I've done some number crunching and I think I have your answer for you. These numbers assume that (a) you use the mining method in the accepted answer you link, (b) that the ores are uniformly distributed, and (c) that you're running a version of Minecraft between 1.6.0 and 1.7.3 (the chart you link hasn't been updated for 1.8 yet).

Mining for an hour with ~30 iron picks should yield you:

• 7,201 cobblestone
• 77 coal
• 308 redstone
• 46 iron
• 8 gold
• 8 diamond
• 37 lapis lazuli

Similarly, using ~6 diamond picks should get:

• 9,166 cobblestone
• 98 coal
• 392 redstone
• 59 iron
• 10 gold
• 10 diamond
• 47 lapis lazuli

As you can see, the iron and diamond yields are far below what goes into the picks. In other worlds, through solid stone, you operate at a loss. Caves make an enormous difference when it comes to mining efficiency.

(All this, of course, assumes my math is correct. Feel free to double-check my work in the spreadsheet.)

This used to be the Metallurgy mod-pack originally (so may be of use to you if you are wanting to use it separately for this purpose)

Taken from the big dig changelogs for v 1.3.2

Removed Metallurgy (taken over by CoFH Core)

It was taken out and replaced instead by CoFH Core (part of Thermal Expansion), the makers of which can be found on this thread.

As a side note, big dig and the current version of tekkit use very different mods, i can't guarantee that you can just copy a map across without causing issues. Though i will test this when i get home and update this post accordingly