The Mines of Saint Giles

From publisher blurb:

Adventure for Characters of 4th through 6th level for Swords & Wizardry.

The dwarven miner Feld has come to the closet human settlement bloody and barely alive. He babbles of undead horrors that have killed his mining crew and taken control of the mines. Before passing out from his injuries and fatigue he offers anyone willing to rid his mines of the undead threat 1,000 gp. Unknown to Feld his mine is the resting site of St. Giles the paladin and a young Necromancer has gotten it in his head to attempt to raise the paladin as his undead servant.