GEOLOGICAL SURVEY *

Soil, probably
cap roek bel

UNITED STATES DEPARTMENT OF THE INTERIOR : >
BULLETIN 1042 PLATE 6

Ss
s
\ saa
avarr OS
LS

7

EXPLANATION

sunday of Sap Tock Nr

Dashed where approximately located
420 Level B, upper floor
oT a Stopes crosshatched

Showing dio, dashed where
approximately located S

Sn
// Pres —\

Y

80, Ge ae
ee
Vertical fracture Level A, lower floor

elevation 3505-3510 feet
we ‘Stopes crosshatched
Strike and dip of beds

e Vo

Clay andso Bearing and plunge of lineation

ss10—!monite V4 7.
3° GO oD
\, shattered rock EN f
\ | clay and cinnabar
\ | \ Blocked (7
J

Level A, upper floor
elevation 3510-3520 feet
Shaft Stopes crosshatched

75-foot level from North Shaft
Stopes crosshatched

Opencut
Bottom indicated by dotted line

| Ai

Minor

13035529
\ e
i : Spad
Inclined, workings Showing position and
Chevrons point down elevation ahove sea level
| he feat 105
| Foot of raise or winze Company designations
| XK Used for specific parts of irregular
\ a workings, such as drifis and crosscuts
Ny \ Head of raise or winze
/ /Crosscut im)
| (50 ft down’ ; \ Se Sere nee Drill hole
eh ———_
i Outline of main workings at end \Iiy,
: ea cee eet \ Ny of operations in 1842 \\ lly
Disturbed beds \ AN Dump
of opaite NI irregularly % \
~s “Sitlocky Sandstone Level D, elevation 3535-3540 feet
Clay-lined | a Stopes crosshatched
a |
f Z
= | | NY yn
Raise up to one | we Level C, elevation 3520-3530 feet
set above A level | Stopes crosshatched
/ \ Level B, elevation 3515-3520 feet
10 Red and brown gouge Stopes crosshatched
N light-colored clay MY
08
ns
Ce k \
eS White clay RN
scraped ‘some residual \
off here inded opalite 90° lized COarse
jth cinnabar > ovat ath bed ciniey \
Rolling crush Cap ree XK X\ nt REE ee
Barge residyal blocks
zone in oo CO cof \
Zk AS ee | |
\
— \
Ny |p, sandstone
K Ny Olay increases to north and
7 roof, some cinnabar |
©
NX ~ e500
SSANS OR gy
eee eatsee asteegge> Sn Suse
., 5 pounds WN \\S -
®.,, He per ton SPOR) 2
/
S
Ele 355. WEISER CLAIM a oe IBEX GLAIM
VN on Ulery lm RIMROGK CLAIM ro ol a ea
inde iia. \ Abundant hard residual joint
a i Yj o6f blocks in clayey matrix
Residual opalific cores
iligiied wood) 7 2
id gastropod casts;
bar in surround’ Y
Kaolinized opalite with
Yl Uy some residual blocks
7 = BY) Raise up over 15 ft
5 WIS indgeea SR ed
NG Poorly defined mT
A residual blocks {/4 / banded clay Gray clay with ghosts
\ Outer border of low-grade zone 9 residual blocks
as estimated by the Idaho aX ba =
Ny Almaden Mine Company W
Raise up 10 ft
46° MQ0’ cay, residual
blocks near floor
Large residual
> joint blocks
Banded clay 1955 Gray clay with Elev 3564"
cinnabar B7P\
Residual blocks.
in red clay
Me r
Outer limit of underground *
workings December 15, 1942
v °
°
°
°
°
°
x
&
g 4) °
3
z
£
°

25

Lo

100 Feet
4

Contour interval 10 feet
Datum is mean sea level

Underground workings based on maps Based on planetable surveys by C. P. Ross and
of the Idaho Almaden Mines Co. Re pec action by GP; Ross,
ass I. W. Balcom, 1943. ic
ata in underground workings by C.P. ess,

°
°
°
z A

2 3530"

‘Cap rock covet

anin A

cap 10"
3500! 3500"
3470" 3470

75-FOOT LEVEL

3440" -3440°

B B
Ete |-3560"
3530" }-3530!
alee [-3500"
Section based mainly on workings as they

existed in August 1941, with later ing:

in ated in dashed lines. Shapes of stopes

approximate. Pillars shown here probably

have been mined.
3470} | 3470"
3440¢ TNTERIGR=GEOLOGICAL SURVEY. WASHINGTON, 5 € 3440!

GEOLOGIC MAP AND SECTIONS OF THE PRINCIPAL WORKINGS OF THE IDAHO ALMADEN MINE, WASHINGTON COUNTY, IDAHO