Lapis Lazuli and Emerald in Developed Build

[epoci]

Hey,

I'm using Voltz through tekkit launcher and noticed that Lapis Lazuli and Emerald ores are missing from my game world, they're there in creation and using cheat mode, but I was not able to find any in my world of playing it for over a week now. I'm using the developed build and have tried clearing cache already.

Have anyone encountered a similar problem or has an idea why this might be? Thanks for you help

[EldRoos]

I have not found any emeralds, but a few lapis. Game was started with 1.0.13.

[Malexion]

Started mine in 1.1 found 2 emeralds in the first 3 hours, maybe dig deeper? Lapis lazuli took me another 4 hours to find though.

[Sev]

Are you mining at the right level? I think Lapis spawns 'round diamond and redstone.