Posted by Mark on August 12, 1999 at 12:12:24:
I'm in need of some information on a couple of old pieces of mining equipment that were used in an area of southern Idaho in the early 1900s. These items are referred to as a "Johnston concentrator" and a "stamp mill." I'm assuming that the stamp mill is the same as that used throughout the early history of quartz mining so am much more interested in the Johnston concentrator.
Any help would be appreciated!