Abstract
Introduction
Previous and present work
Acknowledgments
Geographic and geologic setting
Igneous rocks
Felsic rocks
Old felsic rocks
Porphyry of Clendennin Mountain
Wolf Porphyry
Young felsic rocks
Rholite of Granite Mountain
Porphyry of Galena Creek
Snow Creek(?) Porphyry
Chemistry of the felsic rocks
Intermediate rocks
Quartz monzonite of Hughesville
Barker Porphyry
Chemistry of the intermediate rocks
Mafic rocks
Shonkinite
Plagioclase shonkinite
Syenite
Minette-kersantite
Vogesite
Chemistry of the mafic rocks
Composite dikes
Similarities of clinopyroxenes
The intrusions
Stock
Hughesville stock
Laccoliths
Planoconvex laccoliths
Tongue-shaped satellitic laccoliths
Asymmetric laccoliths
Descriptions of laccoliths
Planocovex laccoliths
Butcherknife Mountain laccolith
Taylor Mountain laccolith
Laccolith(?) underlying the Limestone Butte dome
Dry Wolf laccolith
Satellitic laccoliths
Clendennin-Peterson laccolith
Clendennin fault
Peterson fault
Otter laccolith
Asymmetric laccoliths
Barker laccolith
Mixes Baldy-Anderson Peak laccolith
Bysmalith
Granite Mountain bysmalith
Buried pluton
Indurated alluvium
Emplacement sequence of the intrusions
First intrusive episode
Second intrusive episode
Formation of indurated alluvium
THird intrusive episode
Radiometric ages of the intrusions
Mineral deposits
Barker mining district
Fissure veins in the stock
Fissure veins beyond the stock
Contact-replacement deposits
Tenor
Age of the ores
Localization
San Miguel district
Ore potential
Sulfide veins
Buried mineralized pluton
References cited.