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By Harry J. Olson a Thesis Submitted to the Faculty of The The geology of the Glove Mine, Santa Cruz County, Arizona Item Type text; Thesis-Reproduction (electronic) Authors Olson, Harry J., 1931- Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 28/09/2021 16:26:23 Link to Item http://hdl.handle.net/10150/553959 THE GEOLOGY OF THE GLOVE MINE, SANTA CRUZ COUNTY, ARIZONA by Harry J. Olson A Thesis Submitted to the Faculty of the DEPARTMENT OF GEOLOGY In Partial Fulfillment of the Requirements For the Degree of MASTER OF SCIENCE In the Graduate College THE UNIVERSITY OF ARIZONA 1961 STATEMENT BY AUTHOR This thesis has been submitted in partial fulfillment of re­ quirements for an advanced degree at The University of Arizona and is deposited in The University Library to be made available to borrowers under rules of the Library. Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgment of source is made. Requests for permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major department or the Dean of the Graduate College when in their judgment the proposed use of the material is in the interests of scholar­ ship. In all other instances, however, permission must be obtained from the author. SIGNED: APPROVAL BY THESIS DIRECTOR This thesis has been approved on the date shown below: p'/y /?& / Date THE GEOLOGY OF THE GLOVE MINE, SANTA CRUZ COUNTY, ARIZONA by Harry J. Olson ABSTRACT The Glove Mine is located on the southern extremity of an iso­ lated synclinal sedimentary block of Paleozoic and Cretaceous sediments on the southwest flank of the Santa Rita Mountains. Solutions probably associated with a quartz monzonite intru­ sive, emplaced to the south of the Glove fault, have deposited argen­ tiferous galena, sphalerite, and lesser amounts of quartz, pyrite, and chalcopyrite along permeable zones caused by bedding-plane fault inter­ sections within a favorable limestone horizon of the Naco group. A pre- ore latite porphyry sill has prevented the spread of the mineralizing fluids into the limestones and siltstones to the north on the upper levels of the mine by acting as a deflecting barrier which has channeled the ascending mineral solutions along its footwall side. As the result of extensive oxidation, only relics of the primary sulfides exist in the mined portion of the deposit. Cerussite, lesser ii amounts of anglesite, wulfenite, smithsonite, and other products of the oxidation of the primary sulfides, have been concentrated in caverns leached along the mineralized zone by acids formed by atmospheric COg and the oxidation of pyrite. A zone of increased silver values occurs at the interface be­ tween the oxide and sulfide zones. Mining at the Glove terminated at the top of the sulfide zone after producing over 21,000 tons of ore worth slightly over one million dollars. iii TABLE OF CONTENTS Page 1. INTRODUCTORY COMMENTS................................................. 1 (1.1) Introduction ................................................................... 1 (1.2) Location............................................................................ 1 (1.3) Previous W ork ........................................... 3 (1.4) Scope and Method of Investigation ............................... 4 (1. 5) Acknowledgments............................................................. 5 2. MINING HISTORY AND PRODUCTION..................... ............... 6 (2.1) Claiming ...................................................................... 6 (2.2) History and Production .................................................. 6 3. GEOLOGIC SETTING................................. 15 4. GEOLOGY OF THE MINE AREA............................................... 19 (4.1) General Surface Geology ........................................ 19 (4.2) Description of Rock Types............................................. 23 (4.2.1) Igneous R ocks....................................................... 23 (4.2.2) Sedimentary Rocks ............................................. 27 (4.3) Glove Mine ............................. 28 (4.3.1) S tructure............................................................... 28 (4.3.2) Ore Bodies ........................................................... 30 (4.3.3) Ore Controls......................................................... 35 (4. 4) Blacksmith A d it............................................................... 37 (4.4.1) Structure................................................ 37 (4.4.2) Ore Bodies ................... 38 (4.4. 3) Ore C ontrols......................................................... 40 5. ALTERATION ...................................................... 41 iv Page (5.1) Igneous Rocks ..................................................................... 41 (5.2) Sedimentary Rocks ........................................................... 42 6. SULFIDE MINERALIZATION............. 45 7. OXIDATION OF PRIMARY MINERALS.................................. 47 8. PARAGENESIS............................................................................ 53 (8.1) Hypogene Minerals ........................................................... 53 (8.2) Super gene M inerals........................... .............................. 57 (8. 3) Paragenetic Sequence....................................................... 63 9. SUMMARY OF GEOLOGICAL EVENTS ..................... 65 10. BIBLIOGRAPHY ............................. 80 LIST OF FIGURES Figure Page 1.1 Index m a p ........................ ............ ........... .............................. 2 2.1 Mineralized claims of the Glove group ................................. 8 3.1 Geologic setting ........................................................................ 17 4.1 Ore grade and ore ratios from 1956 through 1960 ........ 34 LIST OF PLATES Plate Page 1. Aerial photographs of the Santa Rita M ountains....................... 66 2. Photograph of the southwest portion of the Santa Rita Mountains ................................................... 67 3. Photographs of the Glove Mine ar e a ........................................ 68 Plate Page 4. Underground photographs, secondary minerals ........... 69 5. Underground photographs, secondary m inerals.................... 70 6. Underground photographs, secondary minerals.................... 71 7. Photomicrographs of polished sections ................................. 72 8. Photomicrographs of polished sections................................. 73 9. Photomicrographs of polished sections................................. 74 10. Photomicrographs of polished sections........................... 75 11. Photomicrographs of polished sections.................................. 76 12. Photomicrographs of polished sections................................. 77 13. Photomicrographs of polished sections................................. 78 14. Photomicrographs of polished sections................................. 79 15. Geologic map of the Glove Mine a r e a ..................................... in pocket 16. Glove Mine, adit lev el...............................................................in pocket 17. Glove Mine, 210 le v e l........... .................................................. in pocket 18. Glove Mine, 240 le v e l...............................................................in pocket 19. Glove Mine, 300 le v e l...............................................................in pocket 20. Glove Mine, 360 le v e l.............................................................. in pocket 21. Blacksmith Adit, lower lev el................................................... in pocket 22. Blacksmith Adit, upper lev el................................................... in pocket 23. Block diagram of a generalized view of the ore body of the Glove Mine .......................................................................hi pocket vi LIST OF TABLES Table Page I. History of production............................................................... 12 II. History of production................................................................ 13 vii 1. INTRODUCTORY COMMENTS (1.1) Introduction The Glove Mine has been a small high-grade lead- silver - zinc deposit—a type which is becoming increasingly rare in this age of large, low-grade open-pit and block-caving operations. The geological prob­ lems are complex and abundant, and many remain unsolved. Only the oxide portion of the deposit has been extracted, and the nature and ex­ tent of the sulfide portion can only be inferred by speculation. The mine is extremely interesting, because its compact size enables one to see the changing aspects of mineralization over short distances, and to visualize the concept of the varied and ever-changing face of ore. (1.2) Location The Tyndall Mining District lies along the west flank of the Santa Rita Mountains from Elephant?s Head on the north to the disman­ tled railroad track, which runs along Sonoita Creek in the San Jose de Sonoita land grant, on the south (see Fig. 1.1). The Glove Mine occurs along the southern extremity of an isolated block of sedimentary rocks just north of Cottonwood Canyon in the north-central portion of the district in sec. 30, T. 20 S., R. 14
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