Sv. Marinova, R. Toncheva, E. Zlatareva, Hr. Pchelarova Institute of Soil Science, Sofia, Bulgaria svetla_mar@mail.bg   Abstract In the field of Ihtiman Municipality has about 1.5 million tons of raw vermiculite. Proven reserves of raw material to a depth of 8 m were 1,4 million tons and is expected to reach 2million tons. Vermiculite is […]