Geology and ore deposits of the Rico District, Colorado / by Edwin T. McKnight.

Abstract
Introduction
Location and geography of district
History
Transportation facilities
Production
Previous literature
Present investigation
Acknowledgments
Stratigraphy
Precambrian rocks
Greenstone and metadiorite
Uncompahgre Quartzite
Early Paleozoic hiatus
Devonian System
Upper Devonian Series
Ouray Limestone
Mississippian System
Lower Mississippian Series
Leadville Limestone
Pennsylvanian System
Middle Pennsylvanian Series
Larsen Quartzite
Hermosa Formation
Middle and Upper(?) Pennsylvanian Series
Rico Formation
Permian System
Lower Permian Series
Cutler Formation
Quarternary System
Holocene Series
Surficial deposits
Igneous rocks
Monzonite
Hornblende latite porphyry
Alaskite porphyry
Hornblende lamprophyre
Relations between different igneous rock types
Age of igneous intrusion
Igneous metamorphism
Igneous metamorphism
Areal extent
Mineralogy of igneous metamorphism
Structure
Faults
Last Chance fault
Smelter fault
Futurity fault and related fault to east
Nellie Bly fault
Yellow Jacket fault
Silver Creek fault
Faults southeast of Silver Creek bounding the quartzite mass
South Park fault
Knob Hill fault
Sandstone Mountain fault
Princeton fault
Blackhawk fault
Honduras fault
Alaskite fault
210 Drift fault
Hidden fault
Faults of Dolores Mountain and vicinity
Faults of Deadwood Gulch
Relation of structure to intrusive rocks
Pebble dikes
Ore deposits
Mienralogy
Hypogene minerals
Iron oxides
Sulfides
Native gold
Gangue minerals
Metamorphic minerals of, at best, only fortuitous association with ores
Supergene minerals
Paragenesis
Types of ore deposits
Massive sulfide replacement deposits chiefly in limestones of Hermosa Formation
Contact-metamorphic deposits
Veins in Hermosa sandstones and arkoses
Replacement deposits in residual debris resulting from solution of gypsum bed
Prevalence of carbon dioxide
Mines
Mountain Spring-Wellington group
Pigeon tunnel
St. Louis tunnel
Rico Argentine group
Log Cabin (Blackhawk) tunnel
Blacksmith tunnel
Argentine tunnel
Rico Consolidated tunnels
James G. Blaine tunnel
200 level
300 level
400 level
500 level
600 level
Yellow Jacket (Phoenix) group
Falcon mine
Aztec mine
Nora Lily mine
Pro Patria and Revenue mines
Forest Payroll mine
Iron Clad (Silver Clad) mine
Jones gold mine
Atlantic Cable mine
Suggestions for prospecting
References cited
Index.