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  • Category: Culture

A significant archaeological breakthrough may have finally solved the millennia-old mystery of where the mercury used in the mausoleum of China's first emperor, Qin Shi Huang, originated.

The Mystery and the Evidence

The ancient historian Sima Qian wrote in the Records of the Grand Historian that the emperor's underground palace contained "rivers and seas of mercury" (以水银为百川江河大海). For centuries, this was considered a literary embellishment. However, modern geophysical surveys have confirmed the presence of an extensive mercury anomaly beneath the burial mound. The mercury concentration in the central mound is dozens of times higher than in surrounding soil, and its distribution pattern—stronger in the east and south, weaker in the northwest—closely matches the layout of China's major waterways as described in historical texts.

The Source: Xunyang's Ancient Cinnabar Mines

The most promising lead points to Xunyang City in Ankang, Shaanxi Province, located just over 100 kilometers from the mausoleum. The region was historically rich in cinnabar (mercury sulfide), the primary ore from which mercury is extracted. According to the late Professor Duan Qingbo, a renowned archaeologist at Northwest University, Xunyang's bronze ditch area alone accounted for approximately 20% of China's mercury reserves within the national territory.

Recent archaeological investigations have identified three ancient sites—Shimiao Gully, Chuantangping, and Guojiawan—dating from the pre-Qin and Han periods. These sites show clear evidence of cinnabar mining, processing, and transshipment. Shimiao Gully is adjacent to the bronze ditch cinnabar mining area and contains artifacts from the Neolithic, Qin-Han, Tang-Song, and Ming-Qing periods. Chuantangping and Guojiawan, located at transportation nodes outside the mining zone, likely served as transit points for transporting cinnabar toward the mausoleum.

The distance of just over 100 kilometers made Xunyang an ideal source for the massive quantities of mercury required for the project.

Alternative and Supplementary Sources

While Xunyang appears to be the primary source, historical records indicate that the Bashu region (modern-day Sichuan and Chongqing) may have also supplied additional mercury. The Records of the Grand Historian notes that a woman named Qing, who controlled extensive mercury resources in the Bashu region, provided mercury for the mausoleum's construction. This suggests a diversified supply network for the ambitious project.

Scientific Validation of the "Mercury Palace"

The existence of the mercury anomaly was first scientifically confirmed through large-scale geophysical prospecting conducted under China's "863 Program." Using 8 categories of geophysical methods and 4 remote sensing techniques, researchers detected a strong mercury anomaly zone covering approximately 12,000 square meters in the central mound. The mercury content in this zone reaches dozens of times the normal soil level. As one archaeological researcher noted, the distribution pattern is not random—it aligns remarkably well with Sima Qian's description, providing the first scientific verification of this ancient record.

Ongoing Research

The mausoleum itself remains unexcavated, with authorities maintaining a policy of non-intrusive research. The recent identification of the Xunyang cinnabar sites, however, represents a crucial step toward understanding the logistical and industrial systems that made the construction of this unprecedented imperial tomb possible.