How can I make a model randomly generator somewhere on the map?

local iron = game.ReplicatedStorage.IronOre
local stone = game.ReplicatedStorage.StoneOre
local ores = 0
function RandomGen()
	while ores <= 20 do 
local newmodel = iron:Clone()
local newmodel2 = stone:Clone()
newmodel:MoveTo(Vector3.new(math.random(-247, 248), 2.52, math.random(-249, 249)))
ores = ores + 1
wait (.3)
	end
end

I am not very good with scripting but I'm trying to make it so that a ore will randomly spawn somewhere within the map.

You didn't call the function, so your code will never run. RandomGen().

Also, you never give the iron a parent, so it will just be nil. newmodel.Parent = workspace

Other than that, it looks right, although of course you never use the stone.