The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1903-07-27
HARTvILLE
QUADRANGLE
Geology and Mineral Resources
of Laramie County, WyO.
AREA CAREFULLY DESCRIBED
IRON ORE THE MOST IMPORT
ANT PRODUCTION.
AREA CAREFULLY DESCRIBED
Especial to the HeraIdl

Washington, July s6.-The geological
survey has recently published a folio
describing with considerable detail the
geology and the mineral resources Of
what is known as the Hartville Quad
rangle' IN Laramie county, Wyoming
near the western margin of the C;reat
plains, along the eastern flank of the
Rocky mountains. The area. described
ahld carefully mapped is about $50
square miles.
The range of altitude within tho
qudorangle Is moderate. The highest
portions, ranging from 5000 To about
o''oU Ieet above sea level. are near the
northern and the southern margins.
whence there is a general slope toward
the North Platte river. The relief in
cuues more or less elevated and ap-
PToNlmately' level regions, intersected
py streams, and in some cases sur
mounted by buttes or mesas; and
rugged and broken hills and ridges
Inc TWO main drainage lines are North
Platte river and Laramie river. Most
OF the smaller streams are intermittent
IN character. Irrigation is generally
necessary for raising crops and has
Deen successfully applied in some parts
or the quadrangle. especially in the re-
experiments in this line are practic-
able.
Geological Formations.
The geological formations of Hart
Vile quadrangle comprise metamorphic.
deep-seated tplutonic), igneous and
sedlmentary rocks. ranging age from
Algonkian to PleistOcene The larger
part of the quadrangle is covered by
sed1mentary rocks-sandStone lime
stones, shales and clays-a smaller pro-
portion OF the surface consisting Of
metamorphic and granite rocks.
The geologic history shows at the be
ginning Of the record a folding and
metamoTphism Of the earliest known
deposits. with the intrusion of igneous
rocks in the form CT bikes and larger
masses. Following this were long pc
RODS of sedimentation (the land being
covered at times with marine and at
times with fresh watcrs). with occa-
sional intervals of erosion. when the
land was elevated above water level.
Iron Ores.
The most important economic prod
oct Of the region is iron ore Chematite).
II is found in a rather limited area in
the vicinity of the town OF Hartville
and although much good ore has been
uncovered by prospecting, only one
WI Nib AllilAt - ItliOl Ltus lildl Ol the
Colorado Fuel & Iron company at Sun
rise. The ore consists of two varieties
of hematite. known as paint ore" and
blue ore and is of high grade, aver
aging about 81 per cent Of metallic iron.
with about 21a per cert Of silica and
practically no phosphorus or sulphur
This region at one time yielded con-
siderable amount of copper ore. though
now little more than GeSultOry pros
nprffnp~ fOr. This fc oar cd on,
Some of the rocks of the quadrangle
might furnish building stones, though
little If any use has been made of them
as yet Onyx marble. gypsum, mica,
quartz and feldspar are among the
minor mineral products.
In addition to descriptive text by
DR.. W. :. Tangier Smith. this folio con-
tains a topographic and a geologic map
of the quadrangle, d sheet Of structure
sections and two sheets of columnar
sections. with one sheet of photo
graphic Illustrations.