TY - RPRT TI - Earth Mapping Resources Initiative protocols—Sampling hard-rock mine waste and perpetual mine water sources AU - Kate M. Campbell AU - Robert R. Seal AU - Nadine M. Piatak AU - Jaime S. Azain AU - Jean M. Morrison AU - Sarah Jane White AU - Andrew H. Manning AU - Katherine Walton-Day AU - JoAnn M. Holloway AU - Bronwen Wang PY - 2025 DO - 10.3133/sir20255068 UR - https://pubs.usgs.gov/publication/sir20255068 ID - sir20255068 ER -