Pearl Mine (MRDS #10019696) AU

Geologic information

Identification information

Deposit ID	10019696
MRDS ID	DC11170
Record type	Site
Current site name	Pearl Mine

Geographic coordinates

Geographic coordinates:	-113.25674, 46.82188 (WGS84)
Elevation	2024
Relative position	2.9 KM NE OF SPRINGTOWN SITE

Site location context

Political divisions (FIPS codes)

Powell(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Elevation Mountain(quadrangle 1:24,000 scale)

Missoula East(quadrangle 1:100,000 scale)

Butte(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Blackfoot(hydrologic unit)

Pend Oreille(hydrologic accounting unit)

Kootenai-Pend Oreille-Spokane(hydrologic subregion)

Pacific Northwest(hydrologic region)

Geographic areas

Country	State	County
United States	Montana	Powell
United States	Montana	Granite

Public Land Survey System information

Meridian	Township	Range	Section	Fraction	State
Montana Principal	012N	013W	05		Montana

Comments on the location information

ON DIVIDE BETWEEN DEEP CR AND BILK GULCH.
Political location in record is Powell county. However, lat/long plot 100m inside adjacent Granite county. Original coordinates for were: lat/long NAD27 46-49-18N 113-15-22W (46.82167 -113.25611); UTM N<blank> E<blank> Z<blank>; PLSS line# 1: Meridian- Montana Principal, TWNSHP 012N, RNG 013W, Sect 05, Sect_fract CENTER OF SE. The PLSS and UTM coordinates agree with the old lat/long. Geonames shows almost identical lat/long coordinates falling just inside Powell county using NAD83 datum. Recalculating lat/long using NAD83 datum moves point very close to location on topo sheet. So the Geonames location was used. Geonames shows 2 other locations for this deposit in Granite county so Granite county was added to the record. The PLSS section_fraction information was deleted and UTM was cleared.

Commodities

Commodity	Importance
Gold	Primary
Copper	Primary

Materials information

Materials	Type of material
Chrysocolla	Ore
Gold	Ore
Malachite	Ore
Garnet	Gangue
Pyrite	Gangue
Quartz	Gangue

Alteration

(Local) Oxidation

Analytical data

Result	150 FT LEVEL NARROW VERTICAL PIPE OF ORE $20-200/TON AU-CU.

Host and associated rocks

Host or associated

Associated

Rock type

Plutonic Rock > Mafic Intrusive Rock > Diorite

Rock unit name

Stock At Top 10 Deep

Rock description

Stock At Top 10 Deep

Stratigraphic age (youngest)	Late Cretaceous
Stratigraphic age (youngest)	Late Cretaceous

Host or associated Host

Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Host or associated	Host
Rock type	Sedimentary Rock > Carbonate > Limestone
Rock unit name	Madison Group;Jefferson Limestone{Maywood Formation;Red Lion Formation{Hasmark Formation
Rock description	Madison Group;Jefferson Limestone{Maywood Formation;Red Lion Formation{Hasmark Formation

Nearby scientific data

(1)	-113.25674, 46.82188	ListMap

Economic information

Geologic structures

Type of structure	Regional
Structure description	Bearmouth Overthrust
Type of structure	Local
Structure description	Garnet Stock

Comments on the geologic information

2 KINDS OF QUARTZ VEINS (1) COARSE CRYSTALLINE THAT INCLOSES SULPHIDES (2) FLINTY QUARTZ THAT CONTAINS CHRYSOCOLL , MALACHITE, AND COPPER OXIDES.

Economic information about the deposit and operations

Development status	Past Producer
Commodity type	Metallic
Deposit size	Small
Significant	No
Production years	PRE-1916.

Mining district

District name	Top O'Deep District

Comments on the production information

$20000 GOLD-COPPER ORE

Comments on the workings information

300 VERTICAL SHAFT WITH LEVELS AT 100, 150, 200, 300 FT., OPEN PITS

Type	Date	Name	Affiliation	Comment
Reporter	01-MAR-1974	Unknown	U.S. Geological Survey
Updater	01-APR-1981	Wise, Kristine K. (Elliott, James E.)	U.S. Geological Survey
Editor	14-AUG-2008	Schruben, Paul	U.S. Geological Survey	Fixed lat/long - county disagreement.

Pearl Mine