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.