Several small factories were built, but coal, river sand and gravel were the most important.

The river sand garnet occurs as a placer deposit.

It has been supplying river sand, natural sand, crushed stone, gravel and shingle.

River sand mining, manufacturing of cement bricks, clay bricks, concrete construction materials are all parts of this industry.

An altar and a temple of limestone, oriented the same way as the previous buildings, were built on a bed of river sand.