8000XS

7000XS

6000XS

20000N

5000XS

4000XS

20000E

3000XS

2000XS

1000XS

000XS

15000N

22000E

3,000 feet

2,000 feet

−1,000 feet

−1,000 feet mine elevation

9000XS 9000XS8000XS

7000XS

6000XS

20000N

5000XS

−1,000 feet

−1,000 feet mine elevation

4000XS

20000E

3000XS

2000XS

−1,000 feet

−1,000 feet mine elevation

1000XS

15000N

000XS

22000E

Sea level

−1,000 feet

−1,000 feet mine elevation

1,000 feet 1,000 feet

3,000 feet

2,000 feet

2,000 feet mine Elevation

3,000 feet mine elevation

1,000 feet

Sea level

1,000 feet

Sea level

00 feet mine elevation

1,000 feet mine elevation

3,000 feet 3,000 feet

2,000 feet

3,000 feet

2,000 feet

ALASKA

MINE LOCATION

altered ultramafics

SP and SPc

grouped together

UPPER SHEAR ZONE

massive carbonate

(altered ultramafic?)

CR/DG

Bruin Creek

arg

umf

umf

CBT

PS128

16.3 feet in front

of section

OFFICE

Greens Creek

LOWER SHEAR ZONE

SP and SPc

grouped together

SPc

PS112

204.5 feet behind

section

Actual location of fold

closure unknown

LANDSLIDE? SP and SPc

grouped together

?

?

?

?

SP

MAKI

SP

SP

serpentinite

arg

PS101

361.8 feet in

front of section

PS101

72.3 feet in

front of section

PS78

198.1 feet

behind

section

POSSIBLE LARGE LANDSLIDE BLOCKS

PS103

47 feet in front

of section

SSS

GSS

SPgr

arg serpentinite

arg

?

?

SP

SP

SP

448

SP

qsc

arg

FAULT

NW fault

of 46XC

F2 SYNCLINE

NORTHWEST WEST

OREBODY

arg synclines

anticlines

?

PS105

13.8 feet in front of section

PS103

180 feet behind section

?

?

?

?

PS97

63.2 feet

behind section

GSS

arg

?

?

?? Serpentine and carbonate-altered ultramafic rocks

Slatey argillite (?) with rare dolomitic and calcareous massive argillite beds UPPER SHEAR ZONE, POST-S2 AND PRE-S3

Possible correlation

of low angle fault? UPPER SOUTHWEST

OREBODY

?

?

?

?

?

?

?

?

?

?

?

?

?

?

?

SP SP

SP

640

Correlation of phyllite-cored anticlines

across this area is uncertain

arg

470

F2 ANTICLINE

arg

SP

BX

BX

BX

BX

BX

BX

GC1342

607.4 feet in

front of section

GC1297

853.4 feet in

front of section

PS108

4.8 feet behind

section

LANDSLIDE

SSS

S3 trace

?

Stratigraphic top

SP

24 36

37

37

37

SP 660

620-

2950

620-

2950

530

420

350

310

250

620-2950

Low angle

fault of 660

(Klaus?)

Low angle

fault of 367

LOWER SOUTHWEST

OREBODY WEST OF HERE

367

F2 anticline

phyllite 30 feet 

to west

GC1214

557.1 feet in front

of section

GC1476

243.1 feet behind section

SSS

SSS

SSS

SSS?

GSS?

BIG SORE RIDGE

Stratigraphic top, 

projection from northeast

GSS

SGS

SGS

GSS

Slate and graphitic quartz-mica phyllite (possibly slatey argillite) ? ?

?

?

?

?

?

?

?

?

?

?

?

?

arg?

umf

Sheared massive carbonate (sedimentary or altered ultramafic)

5250 OREBODY EAST OF HERE

SP

480

200 SOUTH OREBODY WEST OF HERE

?

?

?

?

?

?

?

?

BIG SORE BASIN

???

arg arg ? ? ? ?

GALLAGHER RIDGE

HGB

HGB

HB

?

?

?

?

?

arg

GALLAGHER FAULT

F2 ANTICLINE?

52xc

SPgr

460

NW fault

of 460

arg

CBT

umf

umf

GREENS CREEK MINE, ALASKA, LONG SECTION 4800

(ORIENTATION: N 26.57°W, LOOKING N 63.46°E)

By

John M. Proffett

2010

VERTICAL AND HORIZONTAL SCALE

300 FEET

100 METERS

00

100 200

50

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

PROFESSIONAL PAPER 1763

PLATE 7–2B

Vertical lines labeled with northings and eastings are projections of a Interpretation by John M. Proffett, 1998–2003

local surface grid that is oriented north-south and measured in feet with

origin located at lat 58.0234985°N., long 134.7311267°W.

Vertical lines labeled with XS or LS are a local grid of cross section and

long section coordinates that are used for Greens Creek mine workings.

The grid is rotated 26.5651 degrees counterclockwise from due north

Drill hole and underground elevations are relative to mine system; 

60 feet must be subtracted from these to give elevations 

relative to sea level. 

This and other USGS information products are available at 

http://store.usgs.gov/

U.S. Geological Survey

Box 25286, Denver Federal Center

Denver, CO 80225

To learn about the USGS and its information products visit 

http://www.usgs.gov/

1-888-ASK-USGS

This report is available at:

http://pubs.usgs.gov/pp/1763

Any use of trade, product, or firm names is for descriptive 

purposes only and does not imply endorsement by the U.S. 

Government.

Although this information product, for the most part, is in the 

public domain, it also contains copyrighted materials as noted in 

the text. Permission to reproduce copyrighted items for other than 

personal use must be secured from the copyright owner. 

Suggested citation:

Taylor, C.D., and Johnson, C.A., editors, 2010, Geology, geochemistry, and genesis of the Greens Creek massive sulfide deposit, 

Admiralty Island, southeastern Alaska: U.S. Geological Survey 

Professional Paper 1763, 429 p., 7 plates on CD.

Prepared in cooperation with the

KENNECOTT GREENS CREEK MINING COMPANY

Juneau

Mansfield

Peninsula

Admiralty

Island

Chatham

Strait

Young Bay Stephens

Passage

Douglas

Island

Hawk Inlet

135°00’ 134°45’ 134°30’ 134°15’

58°00’

58°15’

Inset map: Approximate location of long-section 4800, depicted as a 

black bar, relative to Plate 7–1, which is shown as a yellow box.

Lithologic contact—Dashed where approximately located or inferred; dotted 

where projected above present-day ground surface

Fault—Dashed where approximately located or inferred; dotted where projected 

from drill intercepts or above the present-day ground surface

Shear zone (ductile)—Dotted where projected above the present-day ground 

surface. Bold arrows indicate direction of shearing

Massive sulfide deposits

Iron oxide spring deposits

S2 form surface

S3 form surface

S4 form surface

Bedding form surface

Drill hole

Subsurface workings—Number indicates mine level or designation of ramp, 

drift, or decline

Inferred direction of stratigraphic younging

EXPLANATION

480

HYD GROUP OR YOUNGER

Sericitic slatey metasedimentary rock—Gray to greenish metasandstone and 

metasiltstone)

Graphitic slatey metasedimentary rock—Weakly- to strongly-graphitic quartz mica 

phyllite and dark- to pale-gray slate. Local tan or white carbonate beds indicated 

by blue lines

Sericitic (SSS) and graphitic (GSS) rocks, thinly interlayered

HYD GROUP, LATE TRIASSIC

Metabasalt flows

Gabbro

Mine argillite—Includes black to dark-gray slatey argillite (SA) and gray to brown 

massive argillite (MA)

TRIASSIC OR PALEOZOIC ROCKS

Mine phyllite—Sericite-quartz phyllite with lesser chlorite, pyrite, graphite, 

carbonate (SPcb), or tan leucoxene (SPt)

Chloritic phyllite—Chlorite-rich phyllite with lesser quartz, carbonate, sericite, 

pyrite, or leucoxene

Deformed and altered gabbro—Relict gabbroic textures are evident in less altered 

samples (DG); chlorite is abundant where alteration was stronger (CR)

Carbonate rock—Phyllite partings and lithic fragments are apparent locally. 

Alteration product of ultramafic rocks

PALEOZOIC ROCKS

Ultramafic rocks, undivided—Includes altered equivalents

Quartz-sericite ± carbonate phyllite—Commonly displays strong shear fabric 

(S2.5); may be mylonite. Possibly Retreat Group

Breccia—Commonly displays shear-foliation, probably fault breccia

Graphitic quartz-mica schist and phyllite—Contains metamorphic quartz- and 

mica-rich layers. Probably Retreat Group

LIST OF MAP UNITS

[The following map units are defined on the basis of lithology and may or may not correspond to geologic formations 

that have been recognized elsewhere in the region. See chapter 7 for more complete lithologic descriptions and a 

discussion of regional stratigraphic correlations.]

SSS

SGS

GSS

qsc

CBT

BX

arg

DG/CR

SP

SPc

umf

HB

HGB

SPgr