Mineral Deposits in the West Chinati Stock, Chinati Mountains, Presidio County, Texas

GC7201. Mineral Deposits in the West Chinati Stock, Chinati Mountains, Presidio County, Texas, by W. N. McAnulty, Sr. 13 p., 7 figs., 1972. ISSN: 2475-3637. Print.

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ABSTRACT
The West Chinati stock, well exposed in San Antonio Canyon and immediately westward on slopes of the southwestern part of the Chinati Mountains, Presidio County, Texas, is a large stocklike body of porphyritic hornblende granite cut by numerous dikes and irregular-shaped plutons of rhyolite, rhyolite porphyry, microgranite, trachyte porphyry, diorite, and igneous breccia.

Fissure veins developed in wide and long sheeted zones which strike E-W and N. 50" E. containpotentially commercial deposits of lead-zinc-silver fluorspar, minerals including galena (PbS), sphalerite (ZnS), argentite (Ag₂S), cerargyrite (AgCl), and fluorite (CaF₂). Minor amounts of chalcopyrite (CuFeS₂) and oxidized copper minerals also occur in the fissure vein deposits. Marginal bodies of rhyolite, rhyolite porphyry, and trachyte porphyry contain disseminated copper mineralization and possibly host commercial porphyry-type copper deposits.


Keywords: minerals, mineral deposits, Chinati Mountains, Presidio County, Texas

CONTENTS
Abstract

Introduction

Acknowledgments

Physiography

Geology

Chinati Mountains

Intrusive bodies

West Chinati stock

Dikes and plutons

Mineral deposits in the West Chinati stock

Mineralization

Fissure veins

San Antonio Canyon "mine"

Burney "mine"

Hillside adit

Fluorspar prospect

Corral area

Fissure veins in other areas

Disseminated copper mineralization

References

FIGURES

1. Map showing location of West Chinati stock

2. Geologic map (alidade survey) of San Antonio Canyon "mine"

3. Geologic map (alidade survey) of Burney "mine" area

4. Brunton and tape survey of Burney "mine”

5. Geologic map (alidade survey) of Fluorspar prospect and Hillside adit

6. Brunton and tape survey of Hillside adit

7. Geologic map of West Chinati stock



Citation
McAnulty, W. N., Sr., 1972, Mineral Deposits in the West Chinati Stock, Chinati Mountains, Presidio County, Texas: The University of Texas at Austin, Bureau of Economic Geology, Geological Circular 7201, 13 p.