SHANGHAI, Sept. 19 (SMM) – Spot aluminum was mainly traded between RMB 15,520-15,540/mt in Shanghai on Wednesday, with discounts between RMB 120-100/mt. Low-iron aluminum was traded between 15,600-15,620/mt. The most active aluminum contract bucked the trend by edging down while other base metals rose. Spot aluminum prices were resilient to declines and spot discounts narrowed to RMB 100/mt due to cargo holders' strong expectations that downstream producers will replenish stocks before the imminent Mid-autumn Festival and National Day holiday. Buying interest, however, was low, which prompted some traders to move goods with lower quotations. Traded prices of spot aluminum were down as a result. Overall trading was thin.