“…Detailed geologic investigations were consequently focussed on these four sites.' Results of these detailed studies are given in Heiken et al (1987), Eppler et al (1987a), Aldrich et al (1987) and Eppler et al (1987b) for Platanares, Azacualpa, San lgnacio and Pavana, respectively. Detailed geochemical work was also done at the four sites and these results are presented in Goff et al (1987Goff et al ( , 1988a.…”