You MUST ring the gong with the mallet made to do just that, it comes in two pieces,
1). The Handle. (Looks like a nondescript handle).
2). The Head. (Looks like a round stone).
You find these somewhere around on this floor, right clicking on them will describe what they are. You take both pieces to the Forge, to the Anvil. Your cursor should change to two arrows pointing around in a circle, click once and it will explain what the forge is used for, click again and the mallet will be repaired. Bring the repaired mallet and hit the gong with that. Your response to this action should be that you don't hear a sound but you sense a vibration. Now go to the Dwarf and he will be satisfied.
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