Source: The Great Interpretation of Dreams (Ibn Sirin)
A pickaxe in a dream indicates a strong servant or a man relied upon in difficult matters.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A pickaxe indicates strength and power. Digging with it indicates striving in a difficult matter.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A pickaxe is interpreted as goodness and strength.