BEIJING, June 12 (Reuters) - London copper shrugged off early losses to trade flat on Tuesday after U.S. President Donald Trump hailed a "very positive" summit with North Korea's Kim Jong Un, while Shanghai copper prices ended lower for the first time in eight days. U.S. President Donald Trump and North Korean leader Kim Jong Un pledged on Tuesday to work toward complete denuclearisation of the Korean peninsula while Washington committed to provide security guarantees for its old enemy. But a joint statement signed at the end of their historic summit in Singapore gave few details on how either goal would be achieved. London Metal Exchange (LME) copper prices had propelled to a 4-1/2-year high last week on fears of a strike at BHP's Escondida mine in Chile. In a statement on Monday, BHP said it was ready to discuss the "different points of interest" and hoped for a "mutually beneficial agreement" after the mine's union called for a salary increase of 5 percent and a one-time bonus of $34,000. Copper investors "remain cautious, with the continued closure of Vedanta's Tuticorin smelter in India as well as the potential for strike action at Escondida," ANZ wrote in a note. FUNDAMENTALS * SHFE COPPER: The most-traded August copper contract on the Shanghai Futures Exchange closed down 0.5 percent at 53,970 yuan ($8,432.42) a tonne. * LME COPPER: Three-month copper on the LME slipped as much as 0.8 percent to $7,196 a tonne, before clawing its way back up to $7,252, as of 0728 GMT. It fell for two straight sessions after hitting a 4-1/2-year high of $7,348 on Thursday. * IVANHOE: A unit of Chinese state-run conglomerate CITIC Ltd will buy a near 20 percent stake in Canada's Ivanhoe Mines for about C$723 million ($555 million), the companies said on Monday. * ALUMINIUM: A unit of Beijing's Tsinghua University on Tuesday said it would buy aluminium smelter Xinjiang Tianshan for an estimated 23.6 billion yuan ($3.69 billion), in the second major deal in China's aluminium industry in just over two weeks. {nL4N1TE219] * CANADA: The Canadian province of Quebec will offer C$100 million ($77 million) in loans and guarantees on loans to steel and aluminium companies hit by recent U.S. tariffs, the province's economy minister said on Monday.