Preliminary results of the ground penetrating radar (GPR) prospection in the areaof the prehistoric flint mine Borownia, south eastern Poland

Pre lim i nary re sults of GPR field prospection car ried out in the area of the pre his toric min ing field Borownia (Æmielów, Ostrowiec OEwiêtokrzyski Dis trict) are pre sented. This min ing field forms a belt (30–50 m wide and 700 m long), start ing from the val ley edge of the Kamienna River southeastwards. South east ern and west ern parts of the site have pre served the orig i nal post-ex ploi ta tion re lief. Ge ol ogy of the Borownia min ing field was ex am ined and ac quired radio grams re vealed three dis tinct zones of anom aly con cen tra tions. The cen tral zone (B) is clearly a frag ment of the pre his toric min ing field, con firmed not only by the GPR sound ing but also by ar chae o log i cal sur veys. The other two zones have not yet been in ves ti gated in de tail but their sur face and ar chae o log i cal ex am i na tion may de ter mine only whether their un der ground struc tures are nat u ral or have been cre ated by hu mans. Data ob tained dur ing the GPR prospection at the Borownia ar chae o log i cal site con firmed use ful ness of 100, 250 and 500 MHz an ten nas. The rel atively large depth range and good res o lu tion are due to fa vor able geo log i cal con di tions.