An Axe to Find

Walkthrough
Speaking to the blacksmith Glover Mallory in Raven Rock reveals that his favourite pickaxe, not any old pickaxe, but an Ancient Nordic Pickaxe has been taken by one Crescius. No last name mentioned. Now Glover wants his pickaxe back.

Retrieve the Ancient Nordic Pickaxe
It is up to the Dragonborn find Crescius.

The local innkeeper Geldis Sadri mentions the name and relates it to the town's mine. Or exploring the mine will let the Dragonborn stumble into the eighty-year-old ex-miner.

Asking the old miner about the pickaxe lets the Dragonborn tell him to hand it over, or to keep it.

Return Ancient Nordic Pickaxe to Glover Mallory
In the former case, return to Glover Mallory and tell him you got the pickaxe from Crescius Caerellius. He will reward you with said Ancient Nordic Pickaxe (useful since there are several Stalhrim Deposits in the town's mine alone requiring this tool to mine them).

Tell Glover Mallory lie about the Ancient Nordic Pickaxe
Alternately: If the old miner got to keep the pickaxe, lie about him losing it. This still yields a gold reward scaled to the Dragonborn's level.

Verdammte Axt