The silver state. [volume] (Winnemucca, Nev.) 1909-1925, 1912-07-18
MAPS OF WESTERN
MINERAL DISTRICTS

Comprising the United States west
of the 103d meridian, taking in the
Rocky mountain plateau, desert and
Sierra Nevada range, inclusive of
Nevada, Idaho, Montana and other
great western mineral states, the
United States geological survey has
Just issued series of maps showing
this section is one of the most import.
ant producers of precious and allied
metals in the world. In this area are
many mining regions or camps which
are known as mining Districts In
most of the states the boundaries of
these districts are well recognized and
nearly all can be plotted on stage
maps with fair degree of accuracy.
In the Mother Lode country of Cali
fornia, however, there are no thinning
districts in the sense that the term is
used in the other states.
The output of the mines in the Unit
ed States is reported yearly to the
division of mineral resources of the
United States geological survey, and
by study of the district reports for
number of years the values of the
most important metals produced in
each district can be fairly well deter
mined. In some districts, notably
those in Colorado, the values of several
products are nearly equal bue in most
of the districts the output of one metal
has a greater value than that of the
rest.
The United States geological survey
has published reports on the economic
geology of a large number of the
mining districts of the country In
1908 the survey published in its annual
vclume, "Mineral Resources of the
United States,' map of the western
states showing the location of the min
ing districts. Bulletin 507, "Min:ng
Districts of the Western United
States,'' which contains a revise C..
tion of the original map, together with
much new material. is an ndsx If hs,
gold, silver. copper, lead, zinc, quick
silver, iron and rare metal mining dis
t.icts of the western stat g.
A geologic introduction to this re-
port, by Chief Geologist Waa lnal
Lindgren, not only gives general
summary of the geology of the states,
but also describes in some detail the
economic geology of the more import
ant camps as well as some of the less
widely known mining regions This
part of the report includes small
map of the western United States
showing the general distribution of
the mining districts.
The report contains two plates show
inc the areas covered by the topo-
graphic and geologic work of the
United States geological survey
plates adapted from the thirty
annual report of the director-and a
map of each state except
California (Which is represented ON
two maps), showing the location of the
mining districts and by appropriate
symbols the principal metals produced
in each. The report contains fourteen
of these state maps, which show the
location and area of over 400 mining
districts. The map ineludin~ the lar
gest number of districts is that of
the northern counties of California,
which contain 222 districts; the small
lest is the map containing that of
trans Pecos, Texas, which shows only
eleven districts.
With every mining district symbol
on each of these maps is number
which refers to its name in an accom-
panying list. A photography of the
publications of the United States geo.
logical survey on each district is in
cluded in the text, as well as a con-
densed statement of the geology and
nature of the ore deposits, list of
the metals produced and the shipping
points of the camp.
The bulletin contains the latest
available information, but the director
of the geological survey desires that
any mistakes or omissions be brought
to his attention by men in the field
who are in a position to aid in this
work.
Bulletin 5O7, "Mining Districts of
the Western United States, by James
M. Hill. with a Geologic Introduction
by Waldemar Lindgren,' may be OBJ
tanned free on application to the di-
rector of the United States geological