TY - RPRT TI - SHRIMP U-Pb ages of xenotime and monazite from the Spar Lake red bed-associated Cu-Ag deposit, western Montana: Implications for ore genesis AU - John N. Aleinikoff AU - Timothy S. Hayes AU - Karl V. Evans AU - Frank K. Mazdab AU - Renee M. Pillers AU - C. Mark Fanning PY - 2012 DO - 10.2113/econgeo.107.6.1251 UR - https://pubs.usgs.gov/publication/70044847 ID - 70044847 ER -