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About two decades ago, in the land field of Orisovo village, situated on the west side of the town of Chirpan, by means of probes with depth over 280 to 380m, Eocenic Red Clays with big concentration of iron were found. Their thickness is more than 200 – 250m, and their padding, with depth over 600m is not reached. The base clay mineral is ilit. The process of sedimentation took place in considerably small but deep ancient lake by almost desert climate, in the middle of Eocene.

After exhausting of the vein ores of ore zone No 1, the detecting of metasomatic ore beds in the eastern part of Eniovche deposit has prolonged the ore`s life. The analysis of the geologicstructural situation places in the first place lytological and structural factories for localization of the metasomatic ore bodies. The lytological factor is predetermined by the presence of marbles and amphybolites. Its role is additionally increased by the scarn processes , creating much better conditions for metasomatic replac...