On December 19, SteelOrbis reported US domestic silicon metal prices at $3,000-3,100/mt in-warehouse Pittsburgh in the spot market following an uptrend through the month. Sources inform SteelOrbis that US domestic silicon metal prices have since increased to $3,050-$3,120/mt in warehouse Pittsburgh. The change reflects an increase of $50/mt from the bottom of the previous range and $20/mt from the top of the same range. The increase is attributed to tight supply concerns.