The phase A occupation is founded directly on top of sterile gravels or bedrock in the northeast, southeast, and western areas of the mound. Calibrated radiocarbon dates suggest that phase A falls roughly from 4100-3800 BC. Most of the pottery consists of hand-made, chaff tempered wares roughly contemporaneous with the Amuq F assemblage. Phase A deposits were up to 3.7 m. deep, and comprised several distinct superimposed building levels.
Clear architectural differences can be seen between the different parts of the site in phase A. Mudbrick houses are present in area A. A monumental niched stone enclosure wall was built in area B on the south side of the site, while a series of long narrow stone built rooms (possibly storage facilities) were found in area C at the west end of the site.
Area B - monumental niched stone wall - 3 meters thick, and preserved to a height of over 3 meters. Area C - series of 4 long narrow stone rooms - possibly used for storage. This architectural diversity, together with artifacts such as elaborate seals and an infant jar burial with silver rings suggest that the Local Late Chalcolithic society at the site was characterized by some degree of social differentiation and hierarchy. Extensive evidence for copper metallurgy is found in all parts of the site. The presence of apparent prestige goods made of imported raw materials such as chlorite and cowrie shell along with the non-local copper ores all indicate that Hacinebi was an active participant in long-distance exchange with areas to the west, north, and east.
