September/October 2013: In This Issue
During the past three summer seasons, Larry Maltby and I have extensively collected at the St. Louis mine, located about 1.3 miles east of the village of Laurium, Michigan. This little-known locality is seldom visited by collectors but has yielded an array of species, including quartz, pumpellyite-(Mg), epidote, calcite, hematite, prehnite, laumontite, and copper, that occur as free-growing microcrystals in amygdules contained in a lava flow top.
The Maryland mine in Montgomery County, Maryland, was intermittently mined for gold between 1867 and 1940. It was one of the largest, oldest, and most productive gold mines in Maryland. The gold found in the Maryland mine was generally microscopic to finely disseminated in quartz and schist.