TY - RPRT TI - The relationship between the Porco, Bolivia, Ag-Zn-Pb-Sn deposit and the Porco caldera AU - C. G. Cunningham AU - Hugo Aparicio N. AU - Fernando Murillo S. AU - Nestor C. Jimenez AU - J. L. Lizeca B. AU - E.H. McKee AU - G. E. Ericksen AU - Franz Tavera V. PY - 1994 DO - 10.3133/ofr94238 UR - https://pubs.usgs.gov/publication/ofr94238 ID - ofr94238 ER -