By Polina DevittLONDON (Reuters) -Metals analysts are cutting their estimates of global copper supplies for this year and next after an accident at the giant Grasberg mine dramatically tightened the outlook for the market. Benchmark's analysis suggests the disruption will amount to 591,000 tons of lost copper output between September 2025 and the end of 2026. Supply losses from Grasberg mean the global copper market is facing a significantly wider deficit of around 400,000 tons in 2025, according to Benchmark Minerals. The disruption has shifted Goldman Sachs' 2025 copper market balance from a projected surplus of 105,000 tons to a deficit of 55,500 tons. With the losses in Grasberg's September-December production, the copper market faces the largest deficit since 2004, Societe Generale said on Monday.