every 5 minute in world "world":
	loop all blocks between block at location at 0, 0, 0 and block at location at 0, 0, 0:
		loop-block isn't air
		set {_gen.chance} to random integer between 1 to 100
		if {_gen.chance} <= 80:
			set loop-block to stone
		else if {_gen.chance} <= 90:
			set loop-block to coal ore
		else if {_gen.chance} <= 99:
			set loop-block to iron ore
		else:
			set loop-block to gold ore

on break:
	player's gamemode is adventure
	cancel event
	give the block to player
	set the block to cobblestone