Beijing: More than 200 coins that were used about 1,000 years ago were excavated in China's northern Inner Mongolia Autonomous Region, local archaeologists said on Tuesday.

The green verdigris-covered coins, most from the Northern Song Dynasty (960-1127) and some from the Tang Dynasty (618-907), were unearthed at a construction site in Araxan League, said Zhang Zhenzhou with the Araxan Museum.

Zhang said the place where the coins were found belonged to the Western Xia Kingdom, which means that the area was probably a business hub between Northern Song and Western Xia.

Zhang's opinion is echoed by Li Daxiang, curator of Weiwu municipal museum in Gansu Province.

"Despite the many battles between the two kingdoms, bilateral trade was booming, which lead to the transfer of the Northern Song coins to Western Xia," Li said.

Probably people tried to hide their money during warfare by burying the coins, Zhang said.

The archaeologists are classifying and studying the coins in order to ascertain in which year the coins were buried and hopefully shed some light on ancient bilateral trade, Zhang said.

Historical records show that the Song silk, porcelain, iron and various textiles were traded to places as far as the Indus River and modern-day Iraq.