Stable-isotope and trace-element analyses of calcites from Rossie-type and related gash vein deposits (Brown, 1983; Dix and Robinson, submitted) are quite similar overall and show no apparent correlation with sample color, host rock lithology or geographic distribution.
The Rossie lead mines and related gash vein deposits such as the Macomb and Muskalonge Lake fluorite occurrences in northern New York State are among the most famous early American mineral localities.
There are several feeders or gash veins
running into the main ledge carrying higher values.
These gash veins
are aligned like rungs of a ladder between two larger northwest trending master faults, are highly predictable in nature, and control most of the high grade gold at Springpole.
It also occurs in small voids in calcite I which appear to be miniature gash veins
formed by tectonic shearing, where it is associated with chamosite-II, which may either pre-date or postdate it.