Archaeologists today released their major findings at six newly found sacrificial pits at the Sanxingdui Ruins site in Sichuan province.
More than 500 cultural relics were discovered, mainly from pits 3, 6, 7 and 8.
The excavation process has entered the final stage at pit 3, where a gold mask has already been unearthed.
It's the first intact mask to be unearthed as previous ones were all fragments.
Archaeologists said it was likely attached to a bronze head.
An intact jade cong with sacred tree pattern was also unearthed from pit 3,
which will allow archaeologists a chance to study the meaning and symbolism of the sacred tree in ancient society.
At pit 6, a jade blade was found.
Jade blades are believed to have been used in ritual ceremonies, so they were usually not sharp, but the newly found blade is an exception.
A large number of items made of ivory were unearthed from pits 7 and 8, they were also difficult to excavate.
Archaeologists have already found nearly 10,000 artifacts at the Sanxingdui Ruins since March.