Geofyzikální průzkum pozůstatků staré důlní těžby v Lukavici u Chrudimi

Abstract

Lukavice village is located in the eastern Bohemia. Historical records relating to pyrite mining at Lukavice are dated from the beginning of 17th century. The boom of mining and adjoined industrial activity came about the year 1790. Mines were abandoned in 1892. The reason was import of cheap pyrite from abroad, mainly from Spain. An unsuccessful attempt for mining restoration at Lukavice was done in the years 1951-53. Geophysical survey at the centre of Lukavice had two aims. 1) To determine thickness of near surface backfill at chosen sites. Backfill is formed by waste rock from mining and may be a source of contamination of local influent streams. We used shallow refraction seismic measurement for solving this task. 2) To find out if below communications in the centre of the village occur empty or partly filled old mine workings, which could collapse under heavy trucks loaded by gravel from the nearby quarry. For prospecting of voids under communications we used microgravity measurements. Seismic measurements showed that thickness of waste rock backfill varies between 2 and 4 m and increases towards the south. Results of microgravity measurements did not confirm occurrence of empty voids bellow communications in the centre of village. They are some distinctive negative gravity anomalies in the vicinity of historical shafts, but according to gravity modeling the measured anomalies should not be caused by the near surface empty voids.