Ключевые слова: aggregates, building material, construction, construction material, conveyor, conveyors, falling down, grain, grain size, gravel, gravel extraction, gravel pit, gravel plant, gravel winning, gravel works, heap, industrial, industrial equipment, industry, mine, mining, mountain, mountains, outdoors, outside, pebble, quarry pond, road building, rock, sand, sand mining, sand mountain, sieved, sifted fine grained, stones, stretch,