联合国环境规划署（UNEP）：2025年为可持续发展提供能源转型矿物的负责任供应融资报告（英文版）

Advanced exploration: Advanced exploration relates to the later part of stage 2 (if early-stage exploration results justify the intensification of the exploration effort) and to stages 3 and 4 of figure 5.7. It includes the use of heavy machinery such as diamond-drilling rigs or tunneling activities. It uses the techniques mentioned under “early-stage exploration”, in addition to diamond drilling, trenching and tunnelling (if justified), downthe-hole geophysics, three-dimensional digital oreb