How would I make generation for my mining game; summoning ore scattered?

Hi, I'm here again wondering how to make some mine generation. I don't know the rest on what to do to make the objects appear. It's meant to be atleast 6 by 6 blocks wide and 10 blocks deep.
To be honest, I have had help with this but not sure what to do next.

Script Is here.

local ores = {"Zinc", "Copper", "Iron"}

for x=1, (2) do
   for Y=1, (2) do
    for Z=1, (2) do
    Block Generation Here = CFrame.new(Vector3.new(X,Y,Z))) --What to Use for the blocks position, scattering ores if possible.
  end
 end
end 

Credits: JackADevil, discord.