Hello,
Maybe I misconfiguered the plugin, but my players can't mine coal or redstone normally since I installed precious stone.
Is there a setting for this ?
Sorry, for my bad english, I'm french.
Cordially,

Remove the meta-* flags from coal/launchpad field config. They will mine like regular coal.

Thanks.
And now how can they get them ? Like turn Iron ore in sky canon ?
It s possible or not ?

Silk touch or through shops

And how can I sell them ? I just checked and Grief revert block has the same ID of the gold block, which is I think is normal.

You can use economy plugin and use the price flag. This will charge people when they place them. Or you can just use blocks that are not found in the world and sell them in shops.

Thanks.