SHANGHAI, Apr 13 (SMM) - On April 13, premiums of Jinchuan nickel were 7,800-8,000 yuan/mt. The average premium stood at 7,900 yuan/mt, down 350 yuan/mt from the previous trading day. NORNICKEL nickel was quoted with premiums of 7,000-7,500 yuan/mt, with an average of 7,250 yuan/mt, flat from a day ago. Near the delivery of the SHFE 2304 contract, most traders included the NORNICKEL nickel spot in their warrant delivery, hence the premiums stood firm. The suppliers of Jinchuan nickel were much more willing to ship, dragging down the premiums. Nickel briquette prices were 184,700-185,800 yuan/mt, down 200 yuan/mt from the previous trading day. The nickel briquette transactions were slack as it was still traded at premiums over nickel sulphate.