... the Baychief mine and a minimum 40 Ar/ 39 Ar age of 86.6 Ma with resetting after about 74 Ma for sericite from the Sunshine mine. Thus, a second thermal event, sometime in Late Cretaceous or early Tertiary time, was active in the Coeur d’Alene district and in the surrounding area. K-Ar ages from the district...

... (1985 , and references therein), L88 = Leach et al., (1988) , AD95 = Anderson and Davis (1995) , ZS95 = Zartman and Smith (1995) , L98 = Leach et al. (1998a) , RL00 = Rosenberg and Larson (2000) . Leach et al. (1998a) note that the Sunshine mine jasperoid vein (ZS95) is cut by Ag-rich veins...

... of muscovite and phlogopite from veins of the Coeur d’Alene mining district range from 1018 to <74 Ma with a spectrum of intermediate values ( Leach et al., 1988 , 1998a , b ; Rosenberg and Larson, 1996 , 2000 ). Muscovite from altered wall rock adjacent to a vein of the Baychief mine east...