What is the fine-grained topic of the following text: 10 (SMM) -- LME nickel for delivery in three months opened at USD 18,350/mt and closed at USD 19,080/mt, up USD 630/mt from a day earlier, with highest price at USD 19,349/mt and lowest price at USD 18,200/mt. Only return the topic.
LME Nickel Prices