TY - RPRT TI - Mercury isotope fractionation during ore retorting in the Almadén mining district, Spain AU - John E. Gray AU - Michael J. Pribil AU - Pablo L. Higueras PY - 2013 DO - 10.1016/j.chemgeo.2013.08.036 UR - https://pubs.usgs.gov/publication/70073703 ID - 70073703 ER -