Great Leap Forward when the soil was found in Gansu furnace steel-making group of large-scale (Figure)
 
Core Tip: Gansu Sunan soil found in steel-making furnaces during the Great Leap Forward group, a total of 159, is the largest possible number of the largest indigenous group of steel-making furnaces.

Sunan soil found in steel-making furnaces during the Great Leap Forward group

Sunan County Bureau of Cultural Relics According to staff the initial research, the indigenous group of steel-making furnace is the largest possible number of the largest, most complete preservation. At present, the steel-making furnaces have been the site of Sunan county people’s government at the county level as units to be protected, and are included in the seventh installment of the country to declare the list of recommended security units.

It is understood that the indigenous steel-making furnaces silver at the Mongolian Autonomous County of Sunan Yugur rural village and the territory of Nanshan slope cave.

West to east, the site was sitting with a font, a total of 159 smelting furnace, the majority of the collapse of a deteriorating condition, the more complete more than 50. The largest high-smelting furnace 8 meters, 14 meters in diameter; minimum of 2.5 meters high, 2.7 meters in diameter; for the pagoda-shaped, have the furnace flue, flue there is ranging from one or more smelting furnace bore with adobe from masonry; some of the larger ridge height of the furnace in the open pit digging and building, and open 1 or more arched openings for charging, ignition, money slag, a number of ventilation at the bottom of furnace Road; there are 10 connecting furnace. Smelting furnace of the group more than two kilometers long, is quite spectacular. These steel-making furnace was built in 1958 during the Great Leap Forward in 1960, lay-off, after the completion of a part has not been used yet. As a result of these steel-making furnace in which the vicinity of iron ore and coal production, with good conditions for the smelter, it was up and down in the Liyuan River more than fifty kilometers of the area to build steel-making furnaces have a thousand, the area of about 50 square kilometers. (