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Cost of sales and expenses by their nature (Tables)

12 Months Ended

Dec. 31, 2018

Expenses by nature [abstract]

Schedule of Cost of Sales and Administration Expenses

At the years ended at December 31, 2018, 2017 and 2016, the cost of sales and administration expenses consist of the following:

	2 0 1 8			2 0 1 7					2 0 1 6

Raw materials and consumables	$	15,565,242		$	11,268,400			$		10,968,932
Electrical energy		2,536,387			2,123,658					1,767,149
Ferroalloys		1,973,586			1,734,914					1,403,206
Refractories		613,563			492,781					466,815
Oxygen		279,272			213,838					211,051
Electrodes		1,463,091			419,741					276,473
Gas and fuels		766,163			612,605					518,072
Labor		3,181,556			2,699,414					2,931,108
Operation materials		954,415			1,000,752					890,002
Depreciation and amortization		1,112,418			1,465,759					1,429,380
Maintenance		2,243,255			2,586,507					2,565,772
Other expenses		954,379			615,100					625,120
	$	31,643,327		$	25,233,469			$		24,053,080

	2 0 1 8			2 0 1 7					2 0 1 6

Cost of sales	$	30,563,315		$	23,994,526			$		22,775,593
Administrative expenses		1,080,012			1,238,943					1,277,487
	$	31,643,327		$	25,233,469			$		24,053,080