This sounds too soft to me.  Perhaps the haft is inlaid with silver?  Or perhaps it is silver-steel, known also as mithril.

• 13.035 with a silver-hafted axe

“Silver-hilted” in an OED word, but silver-hafted is not.

• 05.120 side-passages opened,

Thought this concept has an OED sub-entry, it is always two words, never hyphenated in OED.

“side, n.1.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/179258. Accessed 21 September 2017.

This work evokes John Masefield’s Sea Fever for me, or perhaps Alfred, Lord Tennyson’s poem Crossing the Bar, which I know set to a beautiful tune.

• 06.045 There was no wind that evening to bring even a sea-sighing

This word is not found in OED.

• 08.131 There the Light-elves and the Deep-elves and the Sea-elves went

This word is not found in any form in OED.

• 12.029 and black rock-shadows danced.

This word is not found in OED.

I marvel at the skill it must take to carve out functioning rock-gates – I imagine them all carven of one piece, like the amazing wooden toys which are, for example, a ball captured in a cage.

• 14.044 the head of their host passed the rock-gates

This word is not found in OED.

• 10.018 Except for occasional squabbles about river-tolls

This word is not found in OED.

• 09.052 began to sing a song round the river-door.

No such word in OED.

I love that in Westron there is a specific name for this game.

• 05.077 that the riddle-game was sacred

The sub-entry for this word is a two-word word, with a space not a hyphen, except in one example … from Tolkien (Fellowship of the Ring).  I’m giving him the credit for the hyphenated spelling.

“riddle, n.1.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/165631. Accessed 19 September 2017.