Search

Yambol administrative district (4786 km²) is located in the southern part of Bulgaria and borders with the Republic of Turkey. The district is known with 146 mineral deposits, 260 occurrences and 62 indications, which include Paleogene lead-zinc deposits. The stream-sediment pan-concentrated surveys of 5541 samples cover 33% of the district. The samples display abundance of gold (9.5%), scheelite (22%) and chromite (36.8%), garnet (35.5%) whereas the traditional for the district galena is found only in 4.4% of the samples. Considering these results the author has compiled prognoses of prospecting for noble metals (gold and silver), base metals (lead, zinc, copper) and rare metals (tungsten, molybdenum, tantalum, tin, mercury, and chromium). Stream-sediment evaluation maps, results from variance statistics of data available, and models of spatial distribution of minerals and mineral associations are presented in the paper. [ABSTRACT FROM AUTHOR]