SHANGHAI, Oct. 21 (SMM) – Traded prices of spot aluminum in Shanghai were between RMB 16,480-16,520/mt on October 21st, with premiums of RMB 100-120/mt over the SHFE current-month aluminum price. Low-iron aluminum was traded between RMB 16,560-16,580/mt. Traded prices of spot aluminum in Wuxi were between RMB 16,440-16,480/mt. Spot aluminum trimmed gains after SHFE aluminum fell from an intraday high. Spot premiums over the SHFE current-month aluminum price, however, were held above RMB 100/mt by goods holders. Stock building demand was limited this last trading day of the week. Market supply remained excessive. Transactions were moderate.