Archive | December 2013

Major Mines of Nevada 2012 – now available

mm2012

Major mines of Nevada 2012: Mineral industries in Nevada’s economy, by Mike Visher, 2013

This twenty-fourth issue of an annual series of reports on the major mines and mills in Nevada lists the names and addresses of operators, numbers of employees, and annual production in 2012. Map locations of all major mines are shown and an overview of mineral production and its effect on Nevada’s economy is presented.

Available on the Web:
http://www.nbmg.unr.edu/dox/mm/mm12.pdf

Special Publication P-24, 28 pages, 5.5×8.5″, $3.00
http://www.nbmg.unr.edu/dox/mm/mm12.pdf

Nevada Geology Calendar 2014 – now with holes punched!

Calendar_2014_Ad

Thanks to an alert customer, we discovered that holes had not been punched in the calendars. The printing company immediately picked up the remainder of the calendars and punched holes in them.

If you have a hole punch at home, it is an easy fix to punch your own holes. If you are stopping by our office anyway, you are welcome to bring your shrink-wrapped calendar in and trade for one with holes punched. If you have a calendar without the shrink wrap, bring it in and we will punch a hole for you.

We will also sell calendars at the Geological Society of Nevada meeting (December 18, 2013 – GSN ANNUAL CHRISTMAS MEETING, ROCK RAFFLE AND AUCTION, http://www.gsnv.org), so you can switch or punch your calendars then, if you bring them with you.

If you still haven’t purchased a 2014 Nevada Geology calendar, you can do so by calling (775) 682-8766 or ordering online at http://www.nbmg.unr.edu/sales/pbsdtls.php?sku=CAL2014

For more information about the 2014 calendar, see http://www.nbmg.unr.edu/_docs/Calendar_2014_Ad.pdf

Three new geologic maps available

Map 180
Geologic Map of the Flowery Peak Quadrangle, Storey and Lyon Counties, Nevada
by Stephen B. Castor, P. Kyle House, Donald M. Hudson, and Christopher D. Henry
2013
 m180

The 1:24,000-scale geologic map of the Flowery Peak quadrangle is an extension of mapping published recently by the Nevada Bureau of Mines and Geology in the adjacent Virginia City quadrangle. The Flowery Peak quadrangle, southeast of Reno and east of Virginia City, includes part of the Comstock mining district, an important historic source of precious metals. More than 60 lithologic units were mapped in the Flowery Peak quadrangle. Twenty-six units are in the three major mid-Miocene intermediate magmatic groups defined in the Virginia City quadrangle. Extensive Quaternary sedimentary deposits include eighteen units exposed in the Carson River Plains in the southeast part of the Flowery Peak quadrangle. Minor amounts of mid-Miocene sedimentary rocks, early Miocene and Oligocene ash-flow tuffs, late Miocene basalt, and Quaternary rhyolitic rocks are present. Mesozoic metasedimentary and granitic rocks occur as well. Mapping of hydrothermal veins and associated alteration in the Flowery Peak quadrangle extends similar mapping in the Virginia City quadrangle. Twelve new 40Ar/39Ar ages determined for igneous rocks in the Flowery Peak quadrangle, along with chemical and mineralogic data, are reported in text that accompanies the map along with full unit descriptions.

This map was prepared as part of the STATEMAP component of the National Cooperative Geologic Mapping Program in cooperation with the U.S. Geological Survey.

This map supersedes Open-File Report 06-16.

Available on the Web:
Text:   http://www.nbmg.unr.edu/dox/m180_text.pdf

Plate:  http://www.nbmg.unr.edu/dox/m180.pdf

Map 180, one 35×31.5-inch color map with 3 cross sections, scale 1:24,000; 24-page text, b/w; folded or rolled, $23.00 or $16.00 (map only)

 

Open-File Report 13-10
Preliminary Geologic Map of the Central Lake Range, Southern Fox Range, and Northern Terraced Hills, Emerson Pass Geothermal Area, Washoe County, Nevada
by Ryan B. Anderson, James E. Faulds, and Gregory M. Dering
2013

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Detailed geologic mapping and stratigraphic-structural analyses have elucidated the kinematics, stress state, and structural controls of a “blind” geothermal system in Emerson Pass on the Pyramid Lake Paiute Tribe Reservation, western Nevada.  The Emerson Pass area resides near the boundary of the Basin and Range and Walker Lane provinces of northwestern Nevada, at the northeast end of Pyramid Lake.  Strata of the surrounding Fox Range, Lake Range, and Terraced Hills are comprised of late Miocene to Pliocene sedimentary rocks and the middle Miocene Pyramid sequence volcanic rocks, all overlying Cretaceous intrusions and Triassic to Jurassic metasedimentary rocks.

The active geothermal system is expressed as a 2-m shallow temperature thermal anomaly (maximum ~60°C) that lies at the western edge of a broad left step at the northeast end of Pyramid Lake between the north- to north-northeast-striking, west-dipping, Fox and Lake Range normal faults.  The 2-m temperature surveys have defined a north-south elongate thermal anomaly that resides on a north- to north-northeast-striking normal fault.  Additionally, travertine mounds, chalcedonic silica veins, and silica-cemented Pleistocene lacustrine gravels in Emerson Pass indicate a robust geothermal system active at the surface in the recent past, likely the early Holocene.  Structural complexity and spatial heterogeneities of the strain and stress field have developed in the step-over region, but kinematic data suggest a west-northwest-trending (~280° azimuth) extension direction.  The geothermal system is likely hosted in Emerson Pass as a result of enhanced permeability generated by the intersection of two oppositely dipping, southward- terminating north- to north-northwest-striking (Fox Range fault) and north-northeast-striking normal faults.

This publication was prepared with support from the U.S. Department of Energy. We thank the Pyramid Lake Paiute Reservation for access to tribal lands and logistical support throughout the project.

Available on the Web:
Text:   http://www.nbmg.unr.edu/dox/of1310_text.pdf

Plate:  http://www.nbmg.unr.edu/dox/of1310.pdf

Open-File Report 13-10, one color plate with 3 cross sections, 51.5×39 inches, scale 1:24,000; inset map, scale 1:8,000; 9-page text, b/w, $21.00

  

Open-File Report 13-11
Preliminary Geologic Map of the Southern Lake Range, Washoe County, Nevada
by Peter S. Drakos and James E. Faulds
2013

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The southern Lake Range is dominated by east-tilted Tertiary volcanic rocks cut by a system of west-dipping normal faults.  The Tertiary strata include a thin veneer of Oligocene ash-flow tuff and an ~1 km thick section of middle Miocene (~16 to 13.2 Ma) volcanic rocks (the Pyramid sequence) composed of thick sequences of mafic lavas and minor intercalated dacite, ash-flow tuff, and conglomerate.  The Tertiary rocks rest nonconformably on Mesozoic granitic-metamorphic basement.  Quaternary alluvial fan and lacustrine deposits locally cover older units within the Lake Range and crop out extensively within and along the margins of the adjoining basins.  These basins are complex, east-tilted half grabens, bounded by west-dipping range-front faults along the Lake Range and Nightingale Mountains, and cut by systems of intrabasinal west-dipping normal faults. Cumulative normal displacement on the west-dipping normal fault system in the southern Lake Range area includes ~3.5 to 5.4 km within and along the eastern margin of the Pyramid Lake basin and ~1.8 km within the southern Lake Range.  Concordant dips of strata (~20-35°) throughout the Miocene and Oligocene sections indicate that major extension began after ~13 Ma.  Significant ongoing transtension and multiple fault intersections in the vicinity of the southern Lake Range suggest that this region has relatively high geothermal potential.

This publication was supported by a grant from the National Science Foundation. Final editing and cartography was supported by an American Recovery and Reinvestment Act grant from the Department of Energy. We thank the Pyramid Lake Paiute Reservation for access to tribal lands and logistical support throughout the project.

Available on the Web:
Text:   http://www.nbmg.unr.edu/dox/of1311_text.pdf

Plate:  http://www.nbmg.unr.edu/dox/of1311.pdf

Open-File Report 13-11, one color plate with cross section, 26.5×24 inches, scale 1:24,000; 5-page text, b/w, $16.00 

USGS Study–Nitrate Levels in Carson Valley Groundwater

Study Evaluates Elevated Nitrate Levels in Carson Valley Groundwater:

The full USGS Scientific Investigations Report 2013-5136, “The Distribution and Modeling of Nitrate Transport in the Carson Valley Alluvial Aquifer, Douglas County, Nevada”, by Ramon C. Naranjo, Toby L. Welborn, and Michael R. Rosen is available online. http://pubs.usgs.gov/sir/2013/5136/

Job Announcements from BLM

We are pleased to announce new, exciting positions available at BLM – BUREAU OF LAND MANAGEMENT. It is our hope that qualified, career oriented individuals at your organization or other professionals known to you will actively consider this position and apply accordingly. Efforts on your part to disseminate this information are greatly appreciated.

Position Information:

Job Description: Civil Engineer
Announcement Number: NV-DEU-2014-0001;
Location(s) of position: Battle Mountain, Nevada, Winnemucca, Nevada;
Salary: $47,448 – $74,628;
Applications will be accepted until: 12/10/2013.
For additional information on this job posting, please go to: https://jobs.mgsapps.monster.com/blm/vacancy/viewVacancyDetail!execute.hms?orgId=3&jnum=108822

Job Description: Civil Engineer
Announcement Number: NV Merit-2014-0026;
Location(s) of position: Battle Mountain, Nevada, Winnemucca, Nevada;
Salary: $47,448 – $74,628;
Applications will be accepted until: 12/10/2013.
For additional information on this job posting, please go to: https://jobs.mgsapps.monster.com/blm/vacancy/viewVacancyDetail!execute.hms?orgId=3&jnum=108957

Job Description: Ecologist
Announcement Number: UT-Merit-2014-0002;
Location(s) of position: Salt Lake City, UT, US;
Salary: $81,823 – $106,369;
Applications will be accepted until: 12/16/2013.
For additional information on this job posting, please go to: https://jobs.mgsapps.monster.com/blm/vacancy/viewVacancyDetail!execute.hms?orgId=3&jnum=108827

Job Description: Planning and Environmental Specialist
Announcement Number: UT-Merit-2014-0008;
Location(s) of position: Moab, UT, US;
Salary: $57,408 – $74,628;
Applications will be accepted until: 12/16/2013.
For additional information on this job posting, please go to: https://jobs.mgsapps.monster.com/blm/vacancy/viewVacancyDetail!execute.hms?orgId=3&jnum=108956

Keck Museum–Moon Rock Exhibit–Begins December 13

University’s Keck Museum to exhibit Nevada’s moon rocks
Public invited to open house/unveiling Dec. 13 in historic Mackay School of Mines building
By Mike Wolterbeek (Nevada Today, November 21, 2013) http://www.unr.edu/nevada-today/news/2013/moon-rocks-at-keck-museum

“The W.M. Keck Earth Science and Mineral Engineering Museum is hosting an open house and unveiling of a new exhibit of Nevada’s moon rock collection on Friday, Dec. 13. The museum is located in the Mackay School of Mines building at the north end of the University of Nevada, Reno Quad. The State of Nevada’s official moon rocks, brought back to earth by astronauts in the Apollo moon-landing missions, will be on display at the University of Nevada, Reno’s W. M. Keck Museum. The public is invited to the unveiling of the new exhibit from 4 p.m. to 6:30 p.m., Friday, Dec. 13.

The Keck Museum is in the historic Mackay School of Mines Building at the north end of the Quad. Its new extraterrestrial rock exhibit will include meteorites found in Nevada and tektites, gravel-sized natural glass formed by the impact of large meteorites on Earth’s surface.

“We’re excited to get this exhibit for the public to enjoy,” Garrett Barmore, administrator of the museum, said. “These great specimens, plus a small American flag that was on the moon with them, are a wonderful addition to the Keck Museum. It’s great to be working so closely with the Nevada State Museum in Carson City, which is loaning us the moon rocks for the public display.”

The unveiling will be held in a small public ceremony during the open house. The display is in partnership with the University’s Planetarium, which will be having its own meteorite collection on display at their facility explaining how scientists use the rocks to determine the age of the universe.

The Keck Museum houses an outstanding collection of minerals, ores, fossil specimens and photographs, in addition to mining related relics. The original mining museum opened in 1908. The museum is also home to some of the spectacular Mackay Silver Collection, created by Tiffany & Co., for John Mackay and completed in 1878.”

Meteorites in Nevada–Read More

If you want to read more about meteorites in Nevada, here are a few publications that might interest you:

Nevada Meteorites, by David A. Davis (chapter from Minerals of Nevada, pages 84-90)  http://www.nbmg.unr.edu/sales/pbsdtls.php?sku=SP31

Megabreccias and Impact Breccias of East Central Nevada, Charles W. Gillespie and Steve Foster, editors (2004 NPGS Fieldtrip Guidebook NPS19). Five papers and road log focusing on the Alamo impact breccia, Ragged Ridge paleokarst breccia, and subsurface breccias in Railroad Valley. Seven reprints comprising the critical literature concerning the Alamo breccia. 196 p. Available only as a softgood download from Dropbox. Please call 775-682-8766 to order.

A Geologic and Natural History Tour through Nevada and Arizona along U.S. Highway 93, with GPS Coordinates (pages 71-73 on the Alamo impact breccia). Use this guidebook to plan a trip to visit the site of a Devonian meteorite impact that created a crater 27 to 40 miles wide and a tsunami that may have been 1,000 feet high. http://www.nbmg.unr.edu/sales/sp35_cart_details.pdf

Please call to order these two books, or you may pick them up at our office:
Rocks from Space (Second Edition), by O. Richard Norton and Dorothy S. Norton
What’s So Mysterious About Meteorites?, by O. Richard Norton and Dorothy S. Norton
O. Richard Norton is the former director of the Fleischmann Planetarium at the University of Nevada, Reno.