Copper closed above the psychologically important $6,000 level again on Monday as the dollar hovered near 13-month lows and mine disruptions fuelled concerns about falling supply. Benchmark copper on the London Metal Exchange closed 0.4 percent higher at $6,027 tonnes. On Friday it had briefly touched $6,051, its highest since March 1. "Copper is testing that $6,000 level again today but technically the uptrend is still intact," said Sucden Financial analyst Kash Kamal, adding that the "outlook across the base metals complex is encouraging." SUPPLY DISRUPTIONS: Union-represented workers and management at Antofagasta's Zaldivar copper mine in Chile failed to reach a wage deal last week and they agreed to extend government-mediated talks into this week. SUPPLY: Disruptions to copper shipments from Canada and Chile have undermined expectations for rising global copper supplies in the second half of the year, cutting the fees that smelters charge miners to process metal. Capital Economics analyst Caroline Bain said the impact from mine disruptions could be minimal as copper inventories were still high, indicating the market was well supplied. DOLLAR: The U.S. dollar laboured at a 13-month low against a basket of currencies, making dollar-denominated commodities cheaper for holders of other currencies and potentially boosting demand. CHINA IMPORTS: Data on Monday showed imports of copper fell 11 percent in June year-on-year to 1,444 tonnes.