Hapisboğazı at Karakiz Kasabasi in the province of Yozgat in north-central Anatolia -the heartland of the empire, was a stone quarry dating to the Hittite Empire period in the Late Bronze Age.
See:
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Geoffrey Summers, Erol Ozen, The Hittite Stone and Sculpture Quarry at Karakiz Kasabasi and Hapis Bokazi in the District of Sorgun, Yozgat, Central Anatolia, American Journal of Archaeology 116(3), 2012, pp. 507-519