Specializing in minerals from Montana
The Summit Mine
Source of the finest hemimorphite specimens in the United States
The Summit mine is located in the southern
portion of the Radersburg mining district in Broadwater County, Montana.
The Summit is the source of the finest hemimorphite specimens in the United
States as well as a number of other secondary minerals. The mine lies
several miles southwest of Radersburg on the southeast flank of a broad
anticline that rises to the west over the Elkhorn Mountains. For the most
part, the early history of the Summit has been lost to time. The mine is
only briefly mentioned in the literature concerning the area and early county
records are spotty at best. Reportedly the mine was discovered in
1887 and saw intermittent activity until recent years. In its infancy, the
Summit was a source of silver-lead ores; towards the end of its productive
history the Summit also produced copper and zinc. The mine has also
been mistakenly called both the Blackhawk and the Montana Silver Star, these
names should be discouraged.
The Summit mine as seen from the south.
The headframe and compressor house of the Summit.
Development at the mine consists of a main single compartment shaft, two shallow vertical shafts, two short adits, and surface structures. The mine explored a replacement body confined to favorable bedding planes in uplifted Mississippian Madison Limestone. The main shaft explores this ore body to a depth of 600 feet. The shaft ranges from vertical to steeply inclined; in places the shaft has been enlarged by stoping.
Looking down the shaft from about three hundred feet below the collar.
Looking up into stoped workings, about 350ft from the surface.
Typical exposure of hemimorphite bearing vugs.
Looking down the shaft near the bottom, note the partially collected hemimorphite vug on the right rib. Consider that all the hemimorphite specimens came from below this point and were packed up 500 feet of rope and ladders.
Go to page 2
All text, images, and design © 2005-2012 Chris Tucker All rights reserved.