USGS TUNGSTEN DEPOSITS of BOULDER COUNTY, COLORADO 1940 with ALL MAPS! SCARCE

Description

SCARCE PRE-WW2 ITEM!!
This is USGS Bulletin 922-F,
Tungsten Deposits of Boulder County, Colorado
. Published in 1940, there can't be many of these around. The publication consists of a 22-page book and both of the original geologic maps! This is an interesting and old publication on a historic mining district. This area was known for excellent specimens of sparkling black ferberite. In addition, a number of other minerals occur in the tungsten veins; check out this long list of cool minerals, drawn from the text:
Hematite
Magnetite
Fluorite
Dickite
Ankerite
Siderite
Barite
Pyrite
Marcasite
Calcite
Galena
Sphalerite
Friebergite
Tetrahedrite
Miargyrite
Adularia
Montmorillonite
Halloysite
Beidellite
Scheelite
Opal
Quartz
This area was an important domestic source of tungsten for many years. One of the maps is a regional map and the other is more detailed, showing the locations of many of the veins, and also the surrounding geology in three colors. The big map (shown as the backdrop in the picture) also shows the locations of gold and silver veins in the area. The book also contains level maps of some of the underground workings. This is a great opportunity to own a rare geologic publication.
Expert packing assured. The recent increase in postage rates was pretty big. As a result, Media Mail is now my default shipping method to keep shipping affordable.
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