Gargali

Gargali is the Wissenland Minor God of Hidden Ores.

Wissenland miners, before entering a new mine, tie a small piece of paper bearing the symbol of Gargali onto a sparrow’s leg. They then keep the sparrow in a cage. If the bird dies, the miners believe they are close to a new vein of ore. Sadly, there are few folks who can confirm if this trick actually works.

Source

 * Warhammer Fantasy RPG 2nd ED -- Tome of Salvation pg. 82