• 13.035 in a coat of gold-plated rings,

Although the nouns “gold-plate” and “gold-plating” are in OED, this word is not.  That seems very strange to me, so I double-checked.  “Plated” is a perfectly good adjective, and it seems that various combinations with the metal which is doing the plating does not make compound words, according to the OED editors.

“gold, n.1.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/79763. Accessed 13 September 2017.

“plated, adj.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/145355. Accessed 13 September 2017.

• 03.035 in Gondolin for the Goblin-wars.
• 05.006 in Gondolin for the goblin-wars

This word is not found in OED.

• 06.034 You lose track of time inside goblin-tunnels.

This word is not found in OED.

• 04.019 And down down to Goblin-town

Is this the name of the place, I wonder?

This word is not found in OED.

• 06.061 Now it seemed that a great goblin-raid

This word is not found in OED.

• 06.050 that lived under the shadow of the goblin-infested mountains,

Ugh.  Vermin. This word is not found in OED.