Metal Tiger PLC ( LON:MTR ) has said it is impressed by ongoing progress and results from Sandfire Resources' Tshukudu project in Botswana. The AIM-quoted firm has 3.57% of Sandfire's shares and holds a 2% net smelter royalty over the project. Sandfire on Monday released a project update including drill results showing copper grades up to 3.6% over a 20.5 metre section, plus a breadth of other drill results with grades of 1.1% to 2.5%. Metal Tiger PLC ( LON:MTR ) has said it is impressed by ongoing progress and results from Sandfire Resources' Tshukudu project in Botswana.