In this paper, technique details for micro-sampling of stalagmite carbonate using a commercial New Wave Technology Micromill are described. Sample sizes averaging 100 μg were obtained from a 40 μm wide milled path despite the porous nature of the sample and the imperfect laminar structure. Sub-annual sampling resolution was achieved producing sufficient material for trace element and stable isotopic analysis. Key aspects of sample mounting and the optimum Micromill parameter settings were established.