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Journal Article

Genesis of the Questa Mo Porphyry Deposit and Nearby Polymetallic Mineralization, New Mexico, USA

Sean P. Gaynor, Joshua M. Rosera, Drew S. Coleman
Journal: Economic Geology
Published: 01 September 2023
Economic Geology (2023) 118 (6): 1319–1339.
DOI: https://doi.org/10.5382/econgeo.5011
... to shallower epithermal deposits. We present new whole-rock chemical and isotopic data for plutonic rocks from the Latir magmatic center, including extensive sampling of drill core samples of intrusive rocks from the Questa porphyry Mo deposit. These data document temporal chemical trends of porphyry-related...
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View PDF for article title, Genesis of the <span class="search-highlight">Questa</span> Mo Porphyry Deposit and Nearby Polymetallic Mineralization, New Mexico, USA
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Journal Article

Intrusive history of the Oligocene Questa porphyry molybdenum deposit, New Mexico

Sean P. Gaynor, Joshua M. Rosera, Drew S. Coleman
Journal: Geosphere
Published: 05 March 2019
Geosphere (2019) 15 (2): 548–575.
DOI: https://doi.org/10.1130/GES01675.1
...Sean P. Gaynor; Joshua M. Rosera; Drew S. Coleman Abstract Subsurface mapping and core analyses of upper crustal intrusions and mineralization at the Questa porphyry molybdenum deposit, New Mexico, reveal that Mo-mineralization occurred through episodic emplacement of at least six intrusive units...
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View PDF for article title, Intrusive history of the Oligocene <span class="search-highlight">Questa</span> porphyry molybdenum deposit, New Mexico
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Journal Article

The geochronology of volcanic and plutonic rocks at the Questa caldera: Constraints on the origin of caldera-related silicic magmas

Matthew J. Zimmerer, William C. McIntosh
Journal: GSA Bulletin
Published: 01 July 2012
GSA Bulletin (2012) 124 (7-8): 1394–1408.
DOI: https://doi.org/10.1130/B30544.1
.... Volcanism began at 28.5 Ma and ended at 22.7 Ma, climaxing with the eruption of the high-SiO 2 peralkaline Amalia Tuff from the Questa caldera at 25.39 ± 0.04 Ma. Following caldera collapse, four resurgent plutons were emplaced between 25.4 and 25.0 Ma. Previous geochemical studies suggested...
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View PDF for article title, The geochronology of volcanic and plutonic rocks at the <span class="search-highlight">Questa</span> caldera: Constraints on the origin of caldera-related silicic magmas
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Book Chapter

Estimating natural background groundwater chemistry, Questa molybdenum mine, New Mexico

Author(s)
Philip L. Verplanck, D. Kirk Nordstrom, Geoffrey S. Plumlee, Bruce M. Walker
Book: Through the Generations: Geologic and Anthropogenic Field Excursions in the Rocky Mountains from Modern to Ancient
Series: GSA Field Guide
Publisher: Geological Society of America
Published: 01 January 2010
DOI: 10.1130/2010.0018(07)
EISBN: 9780813756189
... streamflow-gaging station at the Questa Ranger Station from 1522 September 2002. (B) Variation of pH and dissolved SO 4 and Zn concentrations during the Red River storm study. From Verplanck et al. (2009) . Figure 13. Mixing line constructed between Red River upstream from groundwater emergence...
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Abstract
View PDF for content titled, Estimating natural background groundwater chemistry, <span class="search-highlight">Questa</span> molybdenum mine, New Mexico
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Abstract This 2½ day field trip will present an overview of a U.S. Geological Survey (USGS) project whose objective was to estimate pre-mining groundwater chemistry at the Questa molybdenum mine, New Mexico. Because of intense debate among stakeholders regarding pre-mining groundwater chemistry standards, the New Mexico Environment Department and Chevron Mining Inc. (formerly Molycorp) agreed that the USGS should determine pre-mining groundwater quality at the site. In 2001, the USGS began a 5-year, multidisciplinary investigation to estimate pre-mining groundwater chemistry utilizing a detailed assessment of a proximal natural analog site and applied an inter-disciplinary approach to infer pre-mining conditions. The trip will include a surface tour of the Questa mine and key locations in the erosion scar areas and along the Red River. The trip will provide participants with a detailed understanding of geochemical processes that influence pre-mining environmental baselines in mineralized areas and estimation techniques for determining pre-mining baseline conditions.

Journal Article

Discharge of Hydrothermal Fluids from a Magma Chamber and Concomitant Formation of a Stratified Breccia Zone at the Questa Porphyry Molybdenum Deposit, New Mexico

Pierre-Simon Ross, Michel Jébrak, Bruce M. Walker
Journal: Economic Geology
Published: 01 December 2002
Economic Geology (2002) 97 (8): 1679–1699.
DOI: https://doi.org/10.2113/gsecongeo.97.8.1679
...Pierre-Simon Ross; Michel Jébrak; Bruce M. Walker Abstract The fluorine-rich Questa porphyry Mo deposit, New Mexico, comprises several orebodies with different mineralization styles, including thick veins (decimeter- to meter-scale), thin veinlets (millimeter-scale), and very unusual breccia...
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View PDF for article title, Discharge of Hydrothermal Fluids from a Magma Chamber and Concomitant Formation of a Stratified Breccia Zone at the <span class="search-highlight">Questa</span> Porphyry Molybdenum Deposit, New Mexico
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Journal Article

Fluor-ferro-leakeite, NaNa 2 (Fe 2+ 2 Fe 3+ 2 Li)Si 8 O 22 F 2 , a new alkali amphibole from the Canada Pinabete Pluton, Questa, New Mexico, U.S.A.

Frank C. Hawthorne, Roberta Oberti, Luciano Ungaretti, Luisa Ottolini, Joel D. Grice, Gerald K. Czamanske
Published: 01 February 1996
American Mineralogist (1996) 81 (1-2): 226–228.
DOI: https://doi.org/10.2138/am-1996-1-227
...Frank C. Hawthorne; Roberta Oberti; Luciano Ungaretti; Luisa Ottolini; Joel D. Grice; Gerald K. Czamanske Abstract Fluor-ferro-leakeite is a new amphibole species from the Canada Pinabete pluton, Questa, New Mexico, U.S.A.; it occurs in association with quartz, alkali feldspar, acmite, ilmenite...
View PDF for article title, Fluor-ferro-leakeite, NaNa 2 (Fe 2+ 2 Fe 3+ 2 Li)Si 8 O 22 F 2 , a new alkali amphibole from the Canada Pinabete Pluton, <span class="search-highlight">Questa</span>, New Mexico, U.S.A.
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Journal Article

Direct evolution of brine from a crystallizing silicic melt at the Questa, New Mexico, molybdenum deposit

Jean S. Cline, Robert J. Bodnar
Journal: Economic Geology
Published: 01 December 1994
Economic Geology (1994) 89 (8): 1780–1802.
DOI: https://doi.org/10.2113/gsecongeo.89.8.1780
...Jean S. Cline; Robert J. Bodnar Abstract Molybdenum mineralization in the Southwest orebody at the Questa deposit is associated with crystallization of aplite porphyry, explosive brecciation, and exsolution of magmatic hydrothermal fluids. Quartz, K feldspar, fluorophlogopite, and molybdenite...
View PDF for article title, Direct evolution of brine from a crystallizing silicic melt at the <span class="search-highlight">Questa</span>, New Mexico, molybdenum deposit
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Journal Article

Magmatic-tectonic interaction during early Rio Grande rift extension at Questa, New Mexico

JEFF MEYER, K. A. FOLAND
Journal: GSA Bulletin
Published: 01 August 1991
GSA Bulletin (1991) 103 (8): 993–1006.
DOI: https://doi.org/10.1130/0016-7606(1991)103<0993:MTIDER>2.3.CO;2
...JEFF MEYER; K. A. FOLAND Abstract Pre-caldera and caldera-related igneous rocks near Questa, New Mexico, provide a well-constrained example of upper-crustal extension over a magma chamber. Extensional strain exceeding 200% occurred over many square kilometers in a region now underlain...
View PDF for article title, Magmatic-tectonic interaction during early Rio Grande rift extension at <span class="search-highlight">Questa</span>, New Mexico
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Journal Article

Chemistry of inclusion fluids; stockwork molybdenum deposits from Questa, New Mexico, Hudson Bay Mountain and Endako, British Columbia

Mark S. Bloom
Journal: Economic Geology
Published: 01 November 1981
Economic Geology (1981) 76 (7): 1906–1920.
DOI: https://doi.org/10.2113/gsecongeo.76.7.1906
...Mark S. Bloom Abstract Molybdenum mineralization and coextensive alteration in the Questa, Hudson Bay Mountain, and Endako stockwork molybdenum deposits occur in single and composite veinlets which exhibit an ordered sequence of emplacement. Fluid inclusions in the deposits can be classified...
View PDF for article title, Chemistry of inclusion fluids; stockwork molybdenum deposits from <span class="search-highlight">Questa</span>, New Mexico, Hudson Bay Mountain and Endako, British Columbia
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Journal Article

Selce a microfossili nella "barre turonienne" della Tunisia meridionale ed osservazioni sull'eta di questa formazione

A. Cherchi, R. Schroeder
Published: 01 January 1975
Italian Journal of Geosciences (1975) 94 (4): 979–992.
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Journal Article

K-Ar chronology and sulfur and strontium isotope ratios at the Questa Mine, New Mexico

Alexander William Laughlin, William Allen Rehrig, Richard Leroy Mauger
Journal: Economic Geology
Published: 01 December 1969
Economic Geology (1969) 64 (8): 903–909.
DOI: https://doi.org/10.2113/gsecongeo.64.8.903
View PDF for article title, K-Ar chronology and sulfur and strontium isotope ratios at the <span class="search-highlight">Questa</span> Mine, New Mexico
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Image
Simplified geologic cross section from the Questa porphyry Mo deposit, highlighting the subeconomic Questa granite porphyry intrusion underlying a series of small-volume Mo-mineralizing intrusions. All subsurface sample locations shown on this figure are projected into section. Magmatic hydrothermal breccia (MHBX) bodies are commonly associated with high-grade ore, and in many cases have field relationships indicating multiple episodes of brecciation, alteration, and mineralization. The multiple episodes of MHBX formation and porphyry Mo mineralization at the Questa deposit were the result of punctuated magmatic-hydrothermal events during the protracted 400-k.y. formation of the deposit based on crosscutting relationships and high-precision U-Pb zircon geochronology (Gaynor et al., 2019a). Faults are shown as the bold, black lines. Drill core traces are only shown within a 60-m window of this section. The Questa granite porphyry extends deeper than the depth of this cross section and is underlain by the deep granite that was intercepted by drilling (not shown). No vertical exaggeration. Modified from Gaynor et al. (2019a).

Simplified geologic cross section from the Questa porphyry Mo deposit, high...

Published: 01 September 2023
Fig. 3. Simplified geologic cross section from the Questa porphyry Mo deposit, highlighting the subeconomic Questa granite porphyry intrusion underlying a series of small-volume Mo-mineralizing intrusions. All subsurface sample locations shown on this figure are projected into section. Magmatic
Journal Article

TRITIUM CONTENT OF CLAY MINERALS

Thomas M. Marston, W. T. Parry, John R. Bowman, D. Kip Solomon
Published: 01 April 2012
Clays and Clay Minerals (2012) 60 (2): 186–199.
DOI: https://doi.org/10.1346/CCMN.2012.0600208
... was to investigate the use of tritium as an indicator of the origin of clay minerals within such piles. Tritium values in pore water, interlayer water, and structural hydroxyl sites of clay minerals were examined to evaluate the origins of clay minerals within waste-rock piles located near Questa, New Mexico. Five...
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Journal Article

Le litofacies permiane e triassiche della formazione di M. Facito auctt. nell’area di M. Facito (successione di Lagonegro, Appennino meridionale)

Leonsevero Passeri, Gloria Ciarapica
Published: 01 February 2010
Italian Journal of Geosciences (2010) 129 (1): 29–50.
DOI: https://doi.org/10.3301/IJG.2009.03
...Leonsevero Passeri; Gloria Ciarapica Abstract Questo lavoro ha lo scopo di presentare un panorama completo delle litofacies contenute nella formazione di M. Facito (Permiano superiore-Carnico inferiore p.p .). La successione di questa formazione è stata ricostruita utilizzando spezzoni di serie che...
View PDF for article title, Le litofacies permiane e triassiche della formazione di M. Facito auctt. nell’area di M. Facito (successione di Lagonegro, Appennino meridionale)
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Image

ALTERATION FACIES AND THERMOMETRY OF THE QUESTA PORPHYRY MO DEPOSIT

Published: 05 March 2019
TABLE 2. ALTERATION FACIES AND THERMOMETRY OF THE QUESTA PORPHYRY MO DEPOSIT
Image

INTRUSIVE VOLUME ESTIMATES FOR THE QUESTA MOLYBDENUM DEPOSIT

Published: 05 March 2019
TABLE 6. INTRUSIVE VOLUME ESTIMATES FOR THE QUESTA MOLYBDENUM DEPOSIT
Image
Generalized geologic map of (A) the Latir magmatic field and Questa caldera showing the distribution of the volcanic and plutonic rocks (after Lipman and Reed, 1989) and (B) the northern Rio Grande rift. Abbreviations for the plutonic units are (from oldest to youngest): RD—ring dike; VC—Virgin Canyon; RM—Rito del Medio; CP—Cañada Pinabete; CL—Cabresto Lake; BC—Bear Canyon; SG—Sulphur Gulch; RR—Red River intrusive suite; RH—Rio Hondo; RP—Relica Peak; LP—Lucero Peak. Location of Figure 1A is indicated by the box in Figure 1B. CO—Colorado; NM—New Mexico.

Generalized geologic map of (A) the Latir magmatic field and Questa caldera...

Published: 05 March 2019
Figure 1. Generalized geologic map of (A) the Latir magmatic field and Questa caldera showing the distribution of the volcanic and plutonic rocks (after Lipman and Reed, 1989 ) and (B) the northern Rio Grande rift. Abbreviations for the plutonic units are (from oldest to youngest): RD—ring dike
Image

MINERALOGY OF THE INTRUSIVE UNITS OF THE QUESTA MOLYBDENUM DEPOSIT

Published: 05 March 2019
TABLE 3. MINERALOGY OF THE INTRUSIVE UNITS OF THE QUESTA MOLYBDENUM DEPOSIT
Image
Rotating fence diagram of the southwest ore zone of the Questa Mo deposit, showing the three-dimensional relationships between Mo-mineralizing intrusions. From east to west, the N-S sections are: Supplemental Items C, G, and K (see text footnote 1) and Figure 6; Supplemental Items R, X, and BB (see text footnote 1) and Figure 7. The SW-NE section is Figure 8 and the E-W section in the deep northeast orebody is Supplemental Item DD (see text footnote 1). The fence diagram highlights: (1) the association of the orebodies with hydrothermal magmatic breccias and mineralizing intrusions; (2) the parallel to subparallel orientation of mineralizing intrusive sheets; (3) the relatively small volume of mineralizing intrusions relative to the non-mineralizing Questa granite porphyry; and (4) the generally downward-stacking structure of the intrusive system. If reading the full-text version of this paper, please download article PDF to view Animation 1 in Adobe Acrobat or Adobe Reader. It is also available by visiting http://doi.org/10.1130/GES01675.a1 or the full-text article on www.gsapubs.org. Also available as Supplemental Item AE.

Rotating fence diagram of the southwest ore zone of the Questa Mo deposit, ...

Published: 05 March 2019
Animation 1. Rotating fence diagram of the southwest ore zone of the Questa Mo deposit, showing the three-dimensional relationships between Mo-mineralizing intrusions. From east to west, the N-S sections are: Supplemental Items C, G, and K (see text footnote 1 ) and Figure 6 ; Supplemental
Image
SW-NE cross section of the Questa Mo deposit, oriented roughly along the strike of the southwest ore zone and the same section as in Figure 3 (no vertical exaggeration; intersection lines of the N-S cross sections shown in Figs. 5–7 are indicated). Ore grade is discontinuous between many of the individual orebodies. The southwest ore zone includes a sheet of central aplite dissected by later intrusions of the pit porphyry intrusion, dark-matrix porphyry, and southwest porphyry. Magmatic hydrothermal breccias (MHBX) bodies with high-grade ore have multiple events of brecciation, alteration, and mineralization, indicating the overlapping mineralization was the result of distinct magmatic-hydrothermal events throughout deposit formation.

SW-NE cross section of the Questa Mo deposit, oriented roughly along the st...

Published: 05 March 2019
Figure 8. SW-NE cross section of the Questa Mo deposit, oriented roughly along the strike of the southwest ore zone and the same section as in Figure 3 (no vertical exaggeration; intersection lines of the N-S cross sections shown in Figs. 5 – 7 are indicated). Ore grade is discontinuous