Chlorite, white mica and clay minerals as proximity indicators to ore
1. Introduction. Early studies of porphyry copper systems have used the geochemical and mineralogical zoning patterns of these deposits as a footprint guide for exploration (e.g., Meyer and Hemley, 1967, Lowell and Guilbert, 1970, Gustafson and Hunt, 1975, Dilles and Einaudi, 1992).The illite Kübler index (KI; Guggenheim et al., 2002) has …