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Geology and Mineral Resources in the Zuni Mountains Mining District, Cibola County, New Mexico: Revisitied Virginia T

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Geology and Mineral Resources in the Zuni Mountains Mining District, Cibola County, New Mexico: Revisitied Virginia T New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/64 Geology and mineral resources in the Zuni Mountains mining district, Cibola County, New Mexico: Revisitied Virginia T. McLemore, 2013, pp. 131-142 in: Geology of Route 66 Region: Flagstaff to Grants, Zeigler, Kate; Timmons, J. Michael; Timmons, Stacy; Semken, Steve, New Mexico Geological Society 64th Annual Fall Field Conference Guidebook, 237 p. This is one of many related papers that were included in the 2013 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States. No material from the NMGS website, or printed and electronic publications, may be reprinted or redistributed without NMGS permission. Contact us for permission to reprint portions of any of our publications. One printed copy of any materials from the NMGS website or our print and electronic publications may be made for individual use without our permission. Teachers and students may make unlimited copies for educational use. Any other use of these materials requires explicit permission. This page is intentionally left blank to maintain order of facing pages. NewZUNI Mexico MOUNTAINS Geological Society Guidebook,MINING 64 thDISTRICT Field Conference, Geology of Route 66 Region: Flagstaff to Grants, 2013, p. 131-142 131 GEOLOGY AND MINERAL RESOURCES IN THE ZUNI MOUNTAINS MINING DISTRICT, CIBOLA COUNTY, NEW MEXICO: REVISITED VIRGINIA T. MCLEMORE New Mexico Bureau of Geology and Mineral Resources, NM Institute of Mining and Technology, Socorro, NM 87801, [email protected] ABSTRACT—The Zuni Mountains district is in the central and southern Zuni Mountains in north-central New Mexico. The earliest mining in the Zuni Mountains was by Native Americans, who recovered obsidian (eroded from the Mt. Taylor region), basalt, turquoise, malachite, azurite, and possibly fluorite for ornaments and stone tools. The major types of deposits in the Zuni Mountains include 1) veins and replacements in Proterozoic rocks, 2) stratabound, sedimentary-copper deposits, and 3) fluorite veins, although 4) REE (rare earth elements)-Th-U metasomatic bodies, 5) high-calcium limestone, 6) volcanic cinders (scoria), and 7) iron deposits also are found in the Zuni Mountains district. Total fluorite production exceeded 224,000 short tons of crude ore. Total reported metals production from the district amounts to more than 30,000 pounds copper, 260 oz silver, and 2 oz gold from 1923 to 1965; additional copper, gold, and silver production probably occurred during the late 1800s. There is some economic potential for gold, silver, and possibly copper in the veins and replacement deposits in Proterozoic Zuni and Mt. Sedgwick granites and metarhyolite. The Proterozoic dark syenite and amphibolite bodies and gold-silver veins in the Zuni Mountains should be geochemically evaluated for their platinum group metals (PGE) potential. It is unlikely that the stratabound, sedimentary-copper deposits or fluorite veins have any remaining significant economic potential, because the highest grades have been mined and remaining deposits appear to be discontinuous and low grade. The REE-Th-U metasomatic bodies and iron deposits also have low economic potential because of low grade and small size. The Zuni Mountains continue to have high economic potential for high-calcium limestone and volcanic cinders (scoria). The veins and replacement deposits appear to be Proterozoic in age and are associated with the Zuni and Mt. Sedgwick granites and metarhyolite, while the late Proterozoic episyenites appear to be associated with the Mt. Sedgwick granite. The fluorite veins are much younger and perhaps associated with other Rio Grande rift barite-fluorite deposits in New Mexico. INTRODUCTION identified, plotted on base maps (Fig. 2), and compiled in the New Mexico Mines Database (McLemore et al., 2005a, b). Igneous The Zuni Mountains mining district is in the central and south- rock lithologies were characterized on the basis of mineralogy ern parts of the Zuni Mountains, west and southwest of Grants and chemistry. Types of deposits are from Cox and Singer (1986) in Cibola County, New Mexico (Fig. 1). After 1983, the Zuni Mountains were in Cibola County, which was created from the western portion of what was Valencia County. The major types of deposits in the Zuni Mountains include 1) veins and replacements in Proterozoic rocks, 2) stratabound, sedimentary-copper depos- its, and 3) fluorite veins, although 4) REE (rare earth elements) -Th-U metasomatic bodies, 5) high-calcium limestone, 6) volca- nic cinders (scoria), and 7) iron deposits also are found in the Zuni Mountains district. The only active mining in the Zuni Mountains is for limestone. METHODS OF INVESTIGATION This work is part of ongoing studies of mineral deposits in New Mexico and includes updates and revisions of prior work by North and McLemore (1986, 1988), McLemore et al. (1986), McLemore and McKee (1989), and McLemore (1983, 1989, 2001). Investigations of the mineral deposits and plutonic rocks in the Zuni Mountains by the author began in 1983 in order to assess their economic potential and tectonic setting (McLemore, 1983; McLemore and McKee, 1989). Continued investigations occurred in 1985-1986, as part of the evaluation of mineral resources within Cibola County (McLemore et al., 1986). During 2011-2012, the author resumed investigations in the area in order to understand the origin of the granitic and metasomatic rocks, the tectonic setting, and to evaluate the mineral resource potential. FIGURE 1. Lineaments and mining districts in New Mexico (Chapin et Published and unpublished data were compiled and examined. al., 1978, 2004; McLemore, 2001; Sims et al., 2002; McLemore et al., Mineral occurrences, deposits, mines, prospects, and mills were 2005a). The Zuni Mountains mining district is along the Jemez lineament. 132 MCLEMORE FIGURE 2. Simplified geologic map of the Zuni Mountains (modified by the author from field reconnaissance from Goddard, 1966), showing mines, occurrences, and sample locations (Tables 3, 4). Zuni granite includes metamorphic rocks and aplite. ZUNI MOUNTAINS MINING DISTRICT 133 and McLemore (2001). Production is in Tables 1 and 2. Selected TABLE 2. Additional mineral production from the Zuni Mountains samples were collected and analyzed by a variety of methods as (Goddard, 1966; McLemore et al., 1986). explained in Tables 3 and 4. Commodity Reported Value Years Comments production (dollars) Produced MINING HISTORY AND Fluorite 192,657 unknown 1946-1953 Additional PRODUCTION short tons production 224,000 withheld The Zuni, Acoma, and Navajo people have lived, traveled, short tons 1953-1962 and hunted throughout the Zuni Mountains for centuries. Native Mica 10 255 1909-1953 U.S. Sericite Americans recovered obsidian (eroded from the Mt. Taylor short tons Co. region), basalt, turquoise, malachite, and azurite for ornaments Scoria unknown — — — and stone tools. Fluorite also may have been used by the Zunis for High-calcium unknown — — — decorative ornaments (Lindgren et al., 1910; Oakes et al., 2006; Limestone Zamora, 2008). Base and precious metals were found in the Zuni Mountains mica, worth approximately $255. An unknown amount of lime- circa 1900 and at least one metals mill was built in the district. stone and volcanic cinder also has been produced from the Zuni Total reported production from the district amounts to more than Mountains. Iron ore was found and prospected during WW II; 30,000 lbs copper, 260 oz silver, and 2 oz gold from 1923 to 1965 production, if any, is unknown. (Table 1); additional copper, gold, and silver production probably occurred during the late 1800s. GEOLOGIC SETTING Fluorite was discovered about 1908. A fluorite mill-concen- trator was constructed in the 1910s, but was destroyed by fire The Zuni Mountains lie along the Jemez lineament (Fig. 1; in 1927 (Lasky and Wootton, 1933). In 1943, the Zuni Milling Chapin et al., 1978; Aldrich et al., 1986) and geophysical data Co. (formerly Navajo Fluorspar Mines) opened a fluorspar mill suggest that a mafic intrusion underlies the Zuni uplift (Ander in Los Lunas, where fluorite mined from the Zuni Mountains and Huestis, 1982). The Jemez lineament is defined by north-
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