Server Upgrade for NBMG Web Applications

With the help of the University IT staff, we recently completed a major server upgrade for most of our web applications and GIS services that are available from the Maps & Data page of our website. As a result of this server upgrade, most of our applications are now supported on desktop and mobile devices, cross platform (Apple, Windows, and Android), and with increased performance and stability.

Please note that some applications/web maps now also have new, simplified URLs. These include:

Application Name New URL
Mining Districts https://gisweb.unr.edu/MiningDistricts/
43-101 Reports https://gisweb.unr.edu/43-101Reports/
MyHazards https://gisweb.unr.edu/MyHazards/
MyPlan (requires login for authorized users only) https://gisweb.unr.edu/MyPlan/
Quaternary Faults https://gisweb.unr.edu/QuaternaryFaults/
Topographic Maps Https://gisweb.unr.edu/TopoMaps/
STATEMAP https://gisweb.unr.edu/STATEMAP/
1:500K Geologic Map of NV https://gisweb.unr.edu/NevadaGeology/
Oil & Gas https://gisweb.unr.edu/OilGas/
Reno Minerals https://gisweb.unr.edu/RenoMinerals/
Minerals and Energy https://gisweb.unr.edu/MandE/
Renewable Energy https://gisweb.unr.edu/RenewableEnergy/

Please be sure to update any bookmarks you may have to point to these new URLs.

Thank you for your patience as we worked through this upgrade. If you experience any trouble with our web applications, please contact nbmg@unr.edu or 775-784-6691.

Text-Only Search Tool Added to Mining District Files

Text-Only Search Tool:

A new text-only search tool has been added to the mining district files and is great for mobile devices and for those with slow internet connection. Please make sure JavaScript is enabled in your browser before searching.
nbmg.unr.edu/Collections/MiningDistricts/MDDBTextSearch.html

Interactive Map:

The interactive map includes the same search functionality as the original tool—plus new features. Go to the interactive mining districts web application now or read the how-to guide first.
nbmg.unr.edu/Collections/MiningDistricts/MiningDistricts.html

New Interactive Mining District Map

Rachel (Wearne) Micander, GIS Specialist with the NBMG Cart/GIS group, has created a new interactive mining district map, and you can view the beta test of that map here.

New: Beta test of the interactive mining districts web mapping application and how-to guide.

Please send any comments and suggestions that you may have to Rachel Micander: rwearne@unr.edu

Creation of map services and interactive maps are an important component of the Nevada Bureau of Mines and Geology mission. Interactive maps are developed as a tool for users who may not have access to their own datasets or GIS software. Users can download specific databases, excel files and PDF’s, search layer information, and view updated data without any special skill other than internet familiarity.

The Mining District Files consist largely of historical and current maps, reports, articles, photographs, correspondence, assays, production reports, and reserve information on all aspects of mining in Nevada. These have largely been donated to the NBMG over the years from individuals, companies, and other government agencies.

Over the last several years, Nevada Bureau of Mines and Geology has undertaken the digital conversion of these paper documents into scanned images. The files contained in the mining district files are in PDF file format. The digital file conversion project at NBMG is ongoing. Some records are copyrighted and have no link associated with them in the search results. However, these documents are available for viewing at NBMG’s Great Basin Science Sample and Records Library.

See other interactive maps created by the NBMG Cart/GIS group here:
http://www.nbmg.unr.edu/Mapping/InteractiveMaps.html

Take a five minute vacation with this geologic photo tour of Nevada:
http://nbmg.maps.arcgis.com/apps/MapTour/?appid=32bc91f8e5b84522828663f9b6516410#[nbmg.maps.arcgis.com]

New Geologic Map: Lookout Mountain, Ratto Ridge, and Rocky Canyon, Eureka County

Open-File Report 14-8
Preliminary geologic and alteration maps of Lookout Mountain, Ratto Ridge and Rocky Canyon, southern Eureka mining district, Eureka County, Nevada

by Russell V. Di Fiori, Sean P. Long, John L. Muntean, and Gary P. Edmondo, 2014

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Identification of favorable structural settings for Carlin-type gold deposits is fundamental for future exploration.  In this study, mapping and structural analysis were performed in the southern part of the Eureka mining district in east-central Nevada, in order to understand geometric and temporal relationships between structural systems and Carlin-type mineralization.  Geologic and alteration maps at a scale of 1:10,000 of a ~3.5 km (east-west) by ~8 km (north-south) region were generated, along with cross sections that illustrate pre- and post-extensional deformation geometry.  This project bridges a gap between recent 1:24,000-scale mapping and <1:500-scale mapping performed in an active exploration campaign.

The stratigraphy of the map area consists of ~4 km of Cambrian-Devonian carbonate and siliciclastic rocks, which are unconformably overlain and intruded by late Eocene silicic volcanic rocks.  Four structural systems are identified, consisting of Early Cretaceous contractional structures and three separate sets of normal faults: 1) 1st-order, kilometer-scale offset, down-to-the-west normal faults, including the Lookout Mountain and Dugout Tunnel faults, 2) 2nd-order, 10’s to 100’s meter-scale offset, north-striking normal faults, including the Rocky Canyon, Oswego, and East Ratto Ridge fault systems, and 3) a set of 3rd-order, meter-scale offset, east-striking normal faults that cut jasperoid bodies of presumed late Eocene age.  The 1st- and 2nd-order faults are interpreted to be contemporary, cut Late Cretaceous intrusions and an associated contact metamorphic aureole, and are overlapped by a late Eocene, subvolcanic unconformity.

In addition to lithology and structure, specific types of hydrothermal alteration and mineralization were mapped, including silicification, decarbonatization, dolomitization, quartz/calcite-veining, argillization, and the introduction of sulfides and their limonite weathering products.  Carlin-type replacement mineralization, primarily hosted within Cambrian carbonate rocks, occurs in a series of deposits in the southern part of the map area.  The deposits are associated with decarbonatization, silicification and jasperoid formation, and argillization, and are constrained to late Eocene or older by the overlap and intrusion of dated volcanic rocks.

The map area contains a km-scale, faulted relay-ramp of 2nd-order faults that transfer slip between synthetic 1st-order faults. Within accommodation zones, wall-damage zones are predicted to provide hydrothermal fluid pathways and therefore localize mineralization.  The footwall of the Lookout Mountain fault, which contains the majority of Carlin-type deposits identified in the map area, contains a set of antithetic, 2nd-order normal faults, which is interpreted as a wall-damage zone that was responsible for controlling fluid flow that led to mineralization.

The southern Eureka mining district contains several favorable structural conditions for Carlin-type gold mineralization, including: 1) normal fault systems that predate or are contemporary with late Eocene gold mineralization, and 2) complex normal fault interactions in an accommodation zone, including zones of dense fault intersections, antithetic normal faults, and fault-damage zones.  These structural conditions were fundamental for generating a network of open-system fluid pathways, which created an ideal structural architecture for Carlin-type mineralization, and can be used as predictive tools for exploration elsewhere.

This project was supported by Timberline Resources Corporation and the Geological Society of America.

Open-File Report 14-8, two plates, scale 1:10,000; plate one: 56 x 41 inches, plate two: 29 x 41 inches; folded or rolled, $35.00

Available free on the Web or purchase here: http://www.nbmg.unr.edu/sales/pbsdtls.php?sku=OF14-%208

Major Mines of Nevada 2013–now available

mm13

Major mines of Nevada 2013: Mineral industries in Nevada’s economy, by Rich Perry and Mike Visher, 2014

 

This is the twenty-fifth of an annual series of summary reports on major mines of Nevada. Sand and gravel operations are not included. Information on employment and production for the calendar year 2013 was provided by the individual mine operators. The Nevada Division of Minerals maintains a complete register of Nevada mines. For further information, contact them at 400 W. King, Suite 106, Carson City, Nevada 89703 or call (775) 684-7040, fax (775) 684-7052, or visit their website at http://minerals.nv.gov.

 

Map locations of all major mines are shown and an overview of mineral production and its effect on Nevada’s economy is presented.

 

P-25, $5.00 for a paper copy or available free on the Web:

http://www.nbmg.unr.edu/dox/mm/mm13.pdf

Active Mines and Energy Producers Map—Updates

Nevada Active Mines and Energy Producers (second edition)
by John Muntean and David A. Davis
2014

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Site locations and information on this map were obtained from a variety of published and non-published sources with the last updates made in December 2013. All sites shown on this map have had some form of production activity during 2012 and 2013.The second edition includes the names of the mining districts which were only shown as a symbol marking the center of the district on the first edition map. This map was prepared in cooperation with the Nevada Division of Minerals.

Open-File Report 14-1, 32×36-inch color plate, scale 1:1,000,000

http://www.nbmg.unr.edu/sales/pbsdtls.php?sku=OF14-%201

Also new:Click on link above for GIS files and a reduced-size version (11×17) which are now available.

Active Mines and Energy Producers Map

of14-1

OF14-1: Nevada active mines and energy producers, by John Muntean and David A. Davis, 2014

Site locations and information on this map were obtained from a variety of published and non-published sources with the last updates made in December 2013. All sites shown on this map have had some form of production activity during 2012 and 2013.

This map was prepared in cooperation with the Nevada Division of Minerals.

Available free on the Web: http://www.nbmg.unr.edu/dox/of141.pdf

Purchase: http://www.nbmg.unr.edu/sales/pbsdtls.php?sku=OF14-%201

Open-File Report 14-1, 32×36-inch color plate, scale 1:1,000,000, $16.00