Geology of the Monarch and Michael Breen Mining Properties, Ouray County, Colorado

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GEOLOGY OP THE MONARCH AND MICHAEL BREEN MINING PROPERTIES, OURAY COUNTY, COLORADO LIBRARY COLOR A L U >\ T:«'.>v \L OF MINES GOLOLS, COLORAl/O

By Sherman S . Comatook

ProQuest Number: 10781404

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A t h e s i s s u b m itte d t o th e F a c u l t y and th e B oard o f T r u s t e e s o f th e C olo rado S chool o f Mines i n p a r t i a l f u l f i l l m e n t o f th e r e q u ir e m e n ts f o r th e d e g re e o f M a ste r o f S c ie n c e .

S ign ed : Sherman S. Comstock

n!



1950

Approved:

TTW.

w r-

CONTENTS A b s t r a c t ....................................................... In tro d u c tio n . . . . .

.....................................

..................................... .......................

L o c a tio n and A c c e s s i b i l i t y .............................................. P hy sio g rap h y . / ......................................................................... C lim a te and V e g e ta ti o n .............................................. Geomorphology

................................................................

Problem E n c o u n te re d and P urpose o f T h e s is

. . .

P ro c e d u re and Methods of Mapping ................................ S u r f a c e Mapping

. . . . . .

................................

U nderground M a p p i n g .................................... P re v io u s Work

. . .

.........................................................................

Acknowledgments

. ................................................................

G e o l o g y ......................................... ...................................................... O u tlin e o f G e o lo g ic H i s t o r y Rock Types

..................................... .

......................................... ...................................

Uncompahgre Q u a r t z i t e

..............................................

T e l l u r i d e C onglom erate .............................................. San Ju a n T u ff

................................................................

B a s a l t .................................................. ............................... A n d é s ite .............................................................................. S t r u c t u r a l R e l a t i o n s ........................................................... Ore D e p o s i ts .............................................................................. H i s t o r y and P r o d u c tio n .............................................. M in e ra lo g y and D e s c r i p t i o n o f V eins

. . . .

11

G eology - c o n tin u e d W all-R ock A l t e r a t i o n .

...............................................27

S u rf a c e E x p r e s s io n o f V e i n s ......................................28 C l a s s i f i c a t i o n and O r i g i n o f V e i n s ........................ 28 H o r i z o n t a l P r o j e c t i o n o f S u rf a c e D ata

. . .

D e s c r i p t i o n o f M i n e s ..................................................

28 29

Assay T a b l e s .......................................................................... 30 C o n c l u s i o n s ....................................................*.......................................36 B i b lio g r a p h y .......................................................................................

38

T able 1

S t r a t i g r a p h i e c o r r e l a t i o n o f th e th e s is a re a w ith a g e n e ra l s e c tio n o f th e San Ju a n r e g i o n .......................................... 14

T ab le 2

O utput o f m e t a l s

T able 3

Assay v a l u e s f o r th e Monarch mine . . . .

32

T ab le 4

Assay v a l u e s f o r

33

from th e Monarch mine .

th e M ichael B reen mine .

24

ill

ILLUSTRATIONS F ig u r e

Page

1

In d e x m a p .............................................................................

4

2

A v iew o f th e t h e s i s a r e a lo o k in g n o r t h from th e to p o f Mt. A b r a m s .........................................

5

3

S t r u c t u r a l p a t t e r n .........................................................

21

P la te E nvelope

Monarch

m in e , 1l e v e l

2

Monarch

m in e , Al e v e l ..............................................

"

3

Monarch

m in e, Bl e v e l s ..............................................

tf

4

Monarch

m in e, 2 l e v e l ..............................................

11

5

Monarch

m in e , C. l e v e l ............................................

"

6

Monarch

m in e, 3l e v e l ..............................................

11

7

Monarch m ine, l o n g i t u d i n a l s e c t i o n . . .

8

M ich ael B reen m in e , l o n g i t u d i n a l s e c t i o n ...................................................................

9

. • -

....................

1

M ich ael B ree n m in e , 9 l e v e l

. . . . . .

10

S u rf a c e m a p .....................................................................

11

C laim map

. .

.............................................

” ' ” ” ,f