Gold and Silver
Platinum
I believe I have seen a 2oz silver and 1oz copper but I could be daydreaming.
Can someone else confirm what they are supposed to be?
Also, note of the 1oz silver, while 1oz of silver coins striked for commemorative coins is normal, never was there a moment was 1 full oz of other precious metals was used to strike commemorative coins during the Soviet era, so it might be for medal purposes.