I ever visited is located in the southern Ural, Russia.

The 250m³ (9000 cu-foot) furnace produces ferromanganese casted in pig beds.
The Satka Iron Smelting Works is the oldest existing iron producer in the Ural and among the first to be built in Russia.
Settled on the banks of the Bolshaya Satka river the mill went into production in 1758 founded by Baron Stroganov.
Two blast furnaces and 12 hammers were in operation.
In the 1860ies a puddling steel mill was added.
Since 1910 ferro alloys were produced.
In the 1930ies more than 1300 people worked in the mill, cast iron became the major product.
After financial troubles the plant became partly idled in the 1990ies until the Ivanov family coming from the Swerdlowsk region took over in 2001 annd decided to switch production to high carbon ferromanganese an alloying element for the steel industry.
Satka Iron Smelting Works today runs two blast furnaces of 250m³ and  350m³.
Further images at Stahlseite.