Problem

My sims can’t excavate. They stomp and wave but don’t do anything.

Cause

Unknown.

This bug has been around since the Ambition patch and it will affect any games that are at least patched to that level (you don’t need Ambitions to have the bug).

Solution

None

Mod that solves the problem

Buzzler@MTS has made a HotFix Mod for this issue: Excavation Site Hotfix