Archive | February 2017

SEG Student Chapter Field Trip to Finland—May 27 through June 11

Field Trip AdvisorMike Ressel
Geology and Mineral Deposits of FinlandMay 27–June 11
http://www.nbmg.unr.edu/_docs/Finland_SEG.pdf

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Finland is the 7th largest European country, but ranks as one of the most important in terms of mining.  It produces a variety of industrial, base, and precious-metals commodities.  Deposit types include, but are not limited to, volcanogenic massive sulfide, Kiruna-type apatite-iron, orogenic Au, epigenetic Cu-Au, diamond, mafic/ultramafic-hosted Cr, Ni, PGE, and banded iron formation types.  With such diverse geology concentrated in a small compact peninsula, Finland provides a great opportunity for both students and industry persons alike to be exposed to multiple deposit types along with their associated mining, milling, and in some cases exploration techniques over a 17 day trip held May 27nd–June 11th.

Main Itinerary:

  • May 26th—Travel Day for those not already in Helsinki (overnight flight)
  • May 27th—Arrive Helsinki for pre-trip meeting, culture day, and rest

(overnight in Helsinki)

  • May 28th—University of Helsinki, research, facilities and Finland geology lectures (overnight in Helsinki)
  • May 29th—World-class Waiborg Rapikivi granite quarries (overnight in Varkas)
  • May 30th—Kylylahti mine; active mine (Cu-Co-Zn) (overnight in Joensuu)
  • May 31st—Pampalo mine; active orogenic mine (Au) (overnight in Joensuu)
  • June 1st—Sillinjarvi mine; active carbonatite mine (phosphorous and industrial acids) (overnight in Sotkamo)
  • June 2nd—KIM diamond indicator minerals & Setapera exploration property (diamonds) (overnight in Sotkamo)
  • June 3rd—Pyhasalmimine; active VMS mine (Cu-Zn) (overnight in Oulu)
  • June 4th—Cultural Day in Oulu (overnight in Oulu)
  • June 5th—Ferrochrome steel works tour (overnight in Kemi)
  • June 6th—Rompas Exploration;  (Au-U) Exploration Project (overnight in Rovaniemi)
  • June 7th—Cultural Day Rovaniemi (overnight in Rovaniemi)
  • June 8th—Kolari-Kitilla mines; active IOCG and orogenic Au (Au-Cu-Fe) mine (overnight in Kitilla)
  • June 9th—Cultural Afternoon Oulu; Option for industry participants to fly out early

(overnight in Oulu)

  • June 10th—Drive and Cultural Afternoon Helsinki-Explore more of Helsinki (overnight in Helsinki)
  • June 11th—Travel Day for remainder of the group back to Reno (overnight in Travel)

Total Cost USD $4,300 (covers lodging, ground transport, and most meals, additional cost for private room)
USD $500 due to reserve a seat (non-refundable)
Final Total Balance due March 31st
Must be in Helsinki on or by May 27th
(Airfare to and from Finland the responsibility of attendee)

TERMS AND CONDITIONS
Inclusions: ground transportation from trip origin in Helsinki to either departure in Oulu or Helsinki, lodging from May 27th to June 10th, lunches and dinners. Not Included: airfare, transportation to May 27th meeting place, entry visa(s), reciprocity fee(s), wire transfer/bank fees, foreign exchange fees, travel/cancellation insurance, health insurance, medical/emergency insurance, and personal costs.  Participation is at the risk of each individual. All participants must sign a waiver to release the UNR SEG Student Chapter from all liability associated with participation in this field trip. We strongly recommend you purchase medical and travel insurance in case of emergency. Itinerary, mine visits, and guest speakers are subject to change without notice. Field trip deposits are not refundable. Please contact us for further details.

Brief Geologic History
Finland provides a great opportunity for both students and industry geologists alike to be exposed to multiple deposit types, many of which are unfamiliar to those working in the relatively young Cordilleran margin of North America. Finland is composed of six main tectonic regimes each with different ore deposit styles and all part of the very old 3.1–0.9 Ga Fennoscandian Shield:

1)      The initial assembly and deformation of the Archean (2.5-3.1 Ga) basement (Karelian craton) which includes some of the world’s oldest carbonatites (e.g. Siilinjaavi).

2)      A subsequent period of rifting and generation of Paleoproterozoic greenstone belts (e.g. Kittila).

3)      Closure of the extensional event marked by the exhumation of mantel material containing numerous ultramafic associated PGE, Cr, Ni, and Fe deposits (e.g. Kemi and Suhanko).

4)      A period of compressional tectonics and arc magmatism during the Paleoproterozoic (1.75-2.0 Ga) Svecofennian orogeny (forming the larger part of Finland’s southeastern landmass) and formation of orogenic Au +/-IOCG deposits (e.g. Pampalo).

5)      Another period of extension and partial melting that resulted in the emplacement of the world famous A-type Rapakivi granites, also of latest Paleoproterozoic (~1.64 Ga) age.

6)      Lastly, intrusion of early Paleozoic (Cambrian to Silurian) alkali/carbonatitic intrusions and kimberlite pipes into the margins of the Karelian craton (e.g. Seitepara).

For more information, please contact us:
Academic Advisor—Dr. Mike Ressel—mressel@unr.edu
Industry Advisor—Dave Shaddrick—dave@dshaddrick.com
Chapter President—Elizabeth Hollingsworth—hollingsworther@gmail.com

Trip Advisor: Mike Ressel—Mike has a B.S. in Geology from California State Polytechnic University, Pomona (1989) and M.S. and Ph.D. degrees in Geology (1996 and 2005, respectively) from the University of Nevada, Reno. His graduate studies were Nevada-focused and broadly covered aspects of Tertiary volcanic geology, igneous petrology, regional magmatism, ore deposits, and tectonics. A major focus of his Ph.D. work was on the relationships between magmatism and Carlin-type gold mineralization on the Carlin Trend, Nevada. Since 2000, Mike has not only worked in mining and exploration for gold and copper across North America, but also in Africa, Australia, and South America for several companies involving a variety of deposit styles. Mike has served on several academic research boards including the Precambrian Research Center at the University of Minnesota, Duluth, the Lowell Institute for Mineral Resources at the University of Arizona, and the Center for Research in Economic Geology at the University of Nevada, Reno as well as being an industry liaison for advisory boards of NBMG and the Geological Sciences Department at UNR.  Mike is currently a tenure-track faculty member of the Nevada Bureau of Mines and Geology.

New USGS Professional Paper 1832 – Eruptive History, Geochronology, and Post-Eruption Structural Evolution of the Late Eocene Hall Creek Caldera, Toiyabe Range, Nevada

Authors: Joseph P. Colgan[usgs.gov] (USGS) and Christopher D. Henry (NBMG)
Year: 2017
Series: U.S. Geological Survey (USGS) Professional Paper 1832
Format: Report: viii, 43 p.; figure; data release
ISSN: 2330-7102 (online)
View/download here: https://pubs.er.usgs.gov/publication/pp1832[pubs.er.usgs.gov]
http://pubs.nbmg.unr.edu/Eruptive-Hall-Creek-caldera-p/usgs-pp1832.htm

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Abstract: The magmatic, tectonic, and topographic evolution of what is now the northern Great Basin remains controversial, notably the temporal and spatial relation between magmatism and extensional faulting. This controversy is exemplified in the northern Toiyabe Range of central Nevada, where previous geologic mapping suggested the presence of a caldera that sourced the late Eocene (34.0 mega-annum [Ma]) tuff of Hall Creek. This region was also inferred to be the locus of large-magnitude middle Tertiary extension (more than 100 percent strain) localized along the Bernd Canyon detachment fault, and to be the approximate location of a middle Tertiary paleodivide that separated east and west-draining paleovalleys. Geologic mapping, 40Ar/39Ar dating, and geochemical analyses document the geologic history and extent of the Hall Creek caldera, define the regional paleotopography at the time it formed, and clarify the timing and kinematics of post-caldera extensional faulting. During and after late Eocene volcanism, the northern Toiyabe Range was characterized by an east-west trending ridge in the area of present-day Mount Callaghan, probably localized along a Mesozoic anticline. Andesite lava flows erupted around 35–34 Ma ponded hundreds of meters thick in the erosional low areas surrounding this structural high, particularly in the Simpson Park Mountains. The Hall Creek caldera formed ca. 34.0 Ma during eruption of the approximately 400 cubic kilometers (km3) tuff of Hall Creek, a moderately crystal-rich rhyolite (71–77 percent SiO2) ash-flow tuff. Caldera collapse was piston-like with an intact floor block, and the caldera filled with thick (approximately 2,600 meters) intracaldera tuff and interbedded breccia lenses shed from the caldera walls. The most extensive exposed megabreccia deposits are concentrated on or close to the caldera floor in the southwestern part of the caldera. Both silicic and intermediate post-caldera lavas were locally erupted within 400 thousand years of the main eruption, and for the next approximately 10 million years sedimentary rocks and distal tuffs sourced from calderas farther west ponded in the caldera basin surrounding low areas nearby. Patterns of tuff deposition indicate that the area was characterized by east-west trending paleovalleys and ridges in the late Eocene and Oligocene, which permitted tuffs to disperse east-west but limited their north-south extent. Although a low-angle fault contact of limited extent separates Cambrian and Ordovician strata in the southwestern part of the study area, there is no evidence that this fault cuts overlying Tertiary rocks. Total extensional strain across the caldera is on the order of 15 percent, and there is no evidence for progressive tilting of 34–25 Ma rocks that would indicate protracted Eocene–Oligocene extension. The caldera appears to have been tilted as an intact block after 25 Ma, probably during the middle Miocene extensional faulting well documented to the north and south of the study area.

This publication was prepared in cooperation with the Nevada Bureau of Mines and Geology.

Nevada Active Mines and Energy Producers

Authors: John L. Muntean and David A. Davis
Year: 2017
Series: Open-File Report 2017-01
Version: supersedes Open-File Report 2014-01 (second edition)
Format: 31 x 34.5 inches, color
Scale: compilation at 1:1,000,000
View/download here: http://pubs.nbmg.unr.edu/NV-active-mines-and-energy-2017-p/of2017-01.htme60
Site locations and information on this map were obtained from a variety of published and non-published sources with the last updates made in January 2017. All sites shown on this map have had some form of production activity during 2016.

The map includes the names of the mining districts shown with a symbol marking the center of the district polygon—which does not necessarily represent the center of mining activity in that district. Mining district locations are taken from NBMG Report 47, Mining Districts of Nevada.

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

DGSE Colloquium Speaker Series—Monday February 27 (TODAY)

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Speaker: Dr. Kerri N. Johnson
KNJohnson@ucsb.edu
https://sites.google.com/site/kerrinjp

Topic: Lithologic and Environmental Controls on Channel Incision and Landscape Evolution
Date: Monday February 27

A note from the UNR Dept. of Geological Sciences & Engineering (DGSE): “We have a broad selection of speakers lined up for the semester, and with a few exceptions they will visit us every other week.”

List of confirmed seminar speakers for Spring 2017:
02/27 Dr. Kerri N. Johnson
03/06 Dr. Wes Thelen (USGS-Vancouver) – please note change in date
03/27 Dr. Elizabeth Cassel (U Idaho)
04/03 Dr. Daniela Rubatto (U Bern, Switzerland) – Mineralogical Society of America, Distinguished Lecturer[minsocam.org]
04/24 Dr. James Dolan (USC) – Slemmons Lecture
05/01 Dr. Keith Priestley (Cambridge, UK)

These talks are at the usual location in DMS 102 at 4 p.m.

If you have questions, you can contact Philipp Ruprecht, Assistant Professor, Geological Sciences, at 775-682-6048.

NPGS Monthly Dinner Meeting—March 2—RSVP by Feb 28

NPGS logo

Title: Downhole Camera Technology and Applications
Speaker: Gregg Linville, EV Downhole Camera Services, Western Regional Manager
Nevada Petroleum & Geothermal Society
Monthly Dinner Meeting
Thursday, March 2, 2017

Abstract: Global competition and increasing, rig costs intensify the need for swift and accurate diagnostics of wellbore problems. Video dramatically reduces the time and expense involved in trial and error methods in diagnosing well problems. With proper preparation, video provides excellent, graphic video footage in most wells. Video logging is increasing every year because seeing is believing!

Whether open or cased hole, downhole video exposes minute details along the wall of the wellbore. Consolidated formations with clear water allow visual inspection of the production interval, furnishing key information: fractures, borehole anomalies, bedding layers, drill bit patterns and fluid entry surveys.  Clearly seen and clearly understood, no interpretation required.

http://www.evcam.com/

Ramada Reno Hotel
1000 East 6th Street, Reno, NV 89512

Cocktail Reception 6:30, Skyline Bar, 14th Floor
Cocktails served at 6:30 PM,
Dinner Served at 7:00 PM

NPGS Members $20, Non-Members $23, Students $10

Please RSVP for the dinner meeting by Tuesday Feb. 28 with the following link:
https://docs.google.com/forms/d/e/1FAIpQLSf3C_rYIIC0RiaBp-XdvLlbbLpN9C_Rkeyk5eCd7V5iC9CJXg/viewform
If you find that you cannot attend, please email Vicki Ehni at vehni@aol.com or call at 775-720-6387.
NPGS will be charged for all no shows. Thank you for your consideration.

Nevada Active Mines and Energy Producers

e60

Authors: John L. Muntean and David A. Davis
Year: 2017
Series: Educational Series 60
Version: supersedes Educational Series 49 and 54
Format: 11 x 17 inches, color
Scale: 1 inch = 4 miles
View/download here: http://pubs.nbmg.unr.edu/NV-active-mines-and-energy-2016-p/e060.htm

Site locations and information on this map were obtained from a variety of published and non-published sources with the last updates made in January 2017. All sites shown on this map have had some form of production activity during 2016.

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

DGSE Talk—Monday February 13—Dr. Esteban Gazel, GeoPRISMS Distinguished Lecturer

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A note from the UNR Dept. of Geological Sciences & Engineering (DGSE): “We have a broad selection of speakers lined up for the semester, and with a few exceptions they will visit us every other week.”

Date: February 13, 2017 at 4:00 p.m.

Speaker: Dr. Esteban Gazel (Virginia Tech) – GeoPRISMS, Distinguished Lecturer[geoprisms.org]

The talk is at the usual location in DMS 102 at 4 p.m.

If you have questions, you can contact Philipp Ruprecht, Assistant Professor, Geological Sciences, at 775-682-6048.