The Silver Cog is a dwarven mining company established primarily in the bustling city of Keldagrim, the capital of the Dwarven Realm. The Silver Cog is a member of the Consortium, a collection of eight mining companies responsible for governing the city and its economy.
During The Giant Dwarf quest, you can choose to help this company by gathering materials, primarily ore and bars, for its head secretary. After which, you can do some tasks for the director. The director will then let you join the company as a member, so that you can choose him to have a stone head of his image carved onto the giant statue that is in the middle of keldagrim.
Also, in Forgettable Tale..., you can ask the director to help you remove the boards blocking a railway tunnel.