One of the biggest and archeologically still unexplored twin kurgan of Hungary was formed by the artificial piling up of a soil mass with a total volume of nearly 190 000 m³. The source locations of the heaped material were the originally 2.5–3 meter deep, long trenches that run along the base of the mounds. Based on the sediment-geological analysis of these kurgans, four separate layers can be identified. The uppermost stratum is a “chernozem”-type (black earth) recent soil (930 and 440±50 BP), under which the hillocks’ artificially accumulated loessy soil with mixed structure (5760 ± 90 BP) can be found. Below them, there is a layer of buried, fossil brown soil (4450 ± 60 BP), which can rather be considered a type of forest soil, due to its higher clay and lower organic substance contents, compared to that of the recent soil. Finally, below the buried soil, the base rock mainly consists of yellow-brown loess. By deducting the age of the natural, undisturbed soil of the boundary (located farther away from the mounds) from the age of the fossil soil (both determined by radiocarbon dating), the result gives the approximate date when the 3^rd soil layer was buried, i.e. when these kurgans were being built. The corrected results of the radiocarbon dating – which was performed on both the total organic substance content and the humic acid fraction of the fossil soil – turned out to be very similar (2590±120 and 2570±110 BP, respectively). Based on this result, it can be presumed that the creation of these kurgans is closely linked to the Scythian culture which settled in the Carpathian basin in the 6^th century BC. Judged by size of these hillocks, they were probably burial mounds of Scythian princes or other dignitaries. Based on the high number of rock pieces – mainly Triassic chalk-stone and Miocene rhyolite tuff – found in the surrounding plough-lands and during the excavation of the sepulchral mounds, it has been established that inside these kurgans there are tombs built of stone. Based on the lithological analysis of the rock samples, these pieces originate from the Bükk Mountains and the Szerencsi island hill (from an approximately 16–20 km distance). Our geophysical (magnetic) investigations revealed the existence of a stone crypt (about 40 m in diameter) inside these mounds. At the same time, the detected magnetic anomalies in the adjacent foreground also indicated a number of Sarmatian graves with circular ditches (3–4^th century AD). Based on these findings it can be established that the area and immediate vicinity of the Zsolcai-mounds – rising on an unflooded terrace of the Sajó River – counted as an important burial place for centuries in ancient times.