I sotopi c ab unda nce ratios a re reported for a commercial silver ni t rate, 13 sa mples of native silver, a nd 11 silver min erals of various co mpositions an d fr om widely dis tributed d eposits . Coll ateral m easureme nts of known mi xt ures of n early pure sil vel' isotopes permit th e d etermination of a bsolu te ab undance rat ios. Native sil ver from Cobalt , Ontario, prev iously r eported as ex hibi t in g s tatist ically s ig nifi can t vari ation, is re-examin ed. Additional meas ure ments a re repo rted for samples from t h e sa me nugget a nd from t he same region. Except fo r t he original observation, no sign ifi cant variation from normal a bundance is obser ved for a ny of t h e sa mples. Th e AgI 07(AglOO ratio obtain ed from p oolin g t h e data is 1.07597 wi t h a 95 p erce nt co nfid ence limi t of 0.00055 for t he effect of ra ndom erro rs a nd a total uncer tain ty of 0.001 35 when an allowance for the possible effects of known sour ces of sys tematic error is in cluded.
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Shields et al. (1962) studied this question.