GEOLOGY AND MINING
INDUSTRY OF LEADVILLE
COLORADO

r

Digitized by

the Internet Archive

in 2014

https://archive.org/details/atlastoaccompanyOOemmo

ItERyrrMiKXT of TOK IMTIKHUOIH!

r:xrrK)i!) states dJKOLOtiU'AL sthvey

((■KA!Ur..\CE KIN*; lMJ«Er.T<M?

TO A('('(),MI'A\' ^ A MOAOCIiAI'K
ON THIIK

T] a\ t;^t:i X X X

BY

SAMITEL FRiVNKLIK EMMOI^S

WASniNGTON

i8«a

BYU Library
JWap Collection

folio

j4

CONTENDS.

TITLE Atlas Sheet, I.

LIST OF ATLAS SHEETS - " IL

LEGEND •• ■■ IIL

CENTRAL roLOKADO " " IV.

MOSQUITO RANGE. Tn.-ocR.xniv. " " V.

Gi-:oi.o„v. North Half. " VI.

South Hall. ■• ■• VH.

Gi:oLoGic.\i. SixTioNs. 1. '■ ■• VTII.

II. " •• IX.

HI. •• ■■ X.

LEADVILLE .xnl. X'lCLNnA'. To,.oGR,.\niv. East Half. " " XI.

West Half, ■• •• XH.

Geology. East Half. " ■■ XIII.

West Half. •■ •■ XIV.

GliOLOGIt.-M. Segiions. 1. West Half. " " .W.

East Half, •■ •■ X\T.

II. West Half, •• •■ XVII.

I-:ast Half, •• •■ Will.

111. West Half, •• ■• XIX.

East Half, " ■• XX

JV. " XXI

V. " " XXII

IRON HILL. Geology .AND Mine Workings, " " XXIII.

Geologr.al Skctions. I. " ■■ XXI\.

II. •• ■• XXV

NORTH IRON HILL, Geology and Mine Workings. " " XXX'I.

Geological Sections. " " .XX\ II

CARBONATE HILL. Geology and Mine Workings. " " XX\ 111.

Geological Sections. I. " " .XXIX.

II. " " XXX.
FRYER HILL. Geology and Mine Workings. " " XX.Xl.

Geological Sections. I. " " .XXX II.

"II. ' " '• XXXI H.

III. •• XXX 1\'.
INDEX to SHAFTS ON LEADVILLE MAI' " " XXXV.

LEGEND.

b). A. D. Wilson, Chief Topographer, with nssistanls Reichcl, King, anc
by the Hayden .Survey, elevations being obtained by depression angle'
measured at Leadvillc. slopes and elevations being determined by numerous

three figures, they are to be taken as so many feet above the icooofeet co„tour. Shafts and tunnels are indicated by sn,.,ll crcl
when these are full it indicates that the mine was producing ore at the time of location. They are numbered independently in ca
by meridians and parallels of latitude ; names corresponding to each number, where known, will be found in the Index. They
Leflingwell.

Of the mine maps, the topography of those of Kryer and Carbonate Hills is by Mr. Wilson ; the mine workings were comf
measure from their own surveys, by G. H. Robinson and F. G. Bulkley, respectively.
Both topography and mine workings of the two Iron Hill maps are by H. Hubcr.

All profiles are constructed from the maps with equal vertical and horizontal scales. The scales to which the respective maps ;
Ckntr.\l Colorado — About 4 miles to one inch, or , m^qg. Contours at 200 feet vertical interval.
Mosquito R.ange — Topographical, one mile to one inch, or srrho- Geological, a half mile to one inch, or 777^-
Leadville and Vicimtv — Eight hundred feet to one inch, or rsVs. Contours, 25 feet vertical interval.
Mine Mavs — One hundred and si.\ty feet to one inch, or rVjS. Contours, 10 feet vertical interval.

In field work, and in the preparation of all maps, the geologist in charge has been most efficiently aided from the beginning by assistant g
Ernest Jacob. Assistant geologist Whitman Cross and Prof. Arthur Lakes took part in the field work of the Mostjuito Range. All lithological del
tions have been based on microscopical examinations by Mr. Cross. All palarontological determinations were made by Prof R. P. Whitfield.

Geological colors on the surface maps give the form of outcrops, jirojectotl on a horizontal plane, as they would a])pear if all loose detrilal
were removed. Where the recent formations, however, are of sufllcient importance, they are shown in the cross-sections.

On the Mosquito Map, the formations Weber Grits and Weber Shales are both included under the color of the former; so the Mt.'Zion P,
is included under the color of the White Porphyry, and all other varieties^ indicate<Lby the single color p.

On the . Leadville maps, the color g p denotes only the main intrusive sheet of Gray Porphyry, other smaller bodies of this rock which do r
part of this sheet being indicated by the color p.

All cross-sections are drawn to natural scale, and the thicknesses there given to sedimentary formations arc averages obtained from several n
sections. Data in regard to depths, faults, and folds, arc, in the vicinity of Leadville, mainly derived from underground workings. Where these (
or near the plane of a section, they are indicated thereon in full or .lotted lines respectively.

■dy propo
t plane i,

The following legend gi>

r n: n t r a i. o i. o r ad o

(-A OV LKADVILl,!-; ATi.AS SIIKKTr

STATKS GEOLOGU

jjoij put' ifi- ifi""J-'-'-H'S

IKON H 1 I , I

L T I OiJJI_

r

Uj'.jJUTOv (IF i.i-^ivii.i.r-: ^tlas sn^t^iirmji^

H V E: R 1111,1,

I N D KX TO SIlAl^ TS, &c.

MAP OF LEADVILLE AND VICINITY.

SL T.. I I, III., , B. 11., il U,,il H,,,l,

I

r