From PathfinderWiki

Graystove is one of several districts that surround the Ustalavic capital of Caliphas in Caliphas county. Graystove is an industrial power house that provides Caliphas with most of its brass and bronze while also creating some of the city's largest pieces of metal work. Graystove is kept running by a constant supply of coal and tragically disposable peasant labourers.1