SMM July 31: today, the spot of electrolytic copper in North China quoted a price of 20 to 80 yuan per ton for that month's contract, with a transaction price of 51670 yuan / ton to 51970 yuan / ton. Today's spot discount maintains yesterday's quotation, and the market has obvious characteristics at the end of the month. During the week, the copper price is under pressure of 52000 yuan / ton, and at the end of the month, enterprises are involved in settlement and invoicing, and the transaction is light. Most enterprises mainly take long orders to take goods, and bulk orders rarely make a deal. The smelter gives up the standing price and makes a deal, but it is difficult to make a deal in the market. Traders also take the initiative to lower their quotations, from 40 to 100 yuan per ton to 20 to 80 yuan per ton, and the average spot discount price this week is 8 yuan / ton lower than last week.