Custom Gen

on block growth:
    if event-block is cobblestone:
        chance of 30%:
            set event-block to coal ore
            stop
        chance of 17%:
            set event-block to stone
            stop
        chance of 17%:
            set event-block to cobblestone
            stop
        chance of 14%:
            set event-block to iron ore
            stop
        chance of 9%:
            set  event-block to gold ore
            stop
        chance of 9%:
            set event-block to quartz ore
            stop
        chance of 2%:
            set event-block to diamond ore
            stop
        chance of 1%:
            set event-block to emerald ore
            stop