Black Creek Occurrence

Flat, Alaska

62.4416°N 157.9348°W

Mine Overview

The Black Creek Occurrence is in Flat, Alaska. Historically the site has been part of the Iditarod Mining District. Ore mineralization has been found at this location and the size of the deposit is estimated to be small, however the precise grade, tonnage, and extent of the mineralization are not known. There has been no production and little to no activity other than routine claim maintenance since the mineral discovery. The ore mined is composed of stibnite and cinnabar with waste material consisting primarily of pyrite. The ore body extends 0.30 meters (0.98 feet) thick. The host rock in this area is quartz monzonite from the Pliocene epoch 5.33 to 2.58 million years ago.

Site identification and general characteristics. Learn about USGS mines.

Antimony Primary Commodity
Mercury Secondary Commodity
Site Record Type^?
Occurrence Development Status^?
Metallic Site Commodity Type^?
Small Mine Size^?

Mine Names

Name^? Status^?
Black Creek Occurrence Current

Commodities

Additional textual information about a site or mine.

Commodity Type Importance
Antimony Metallic Primary
Mercury Metallic Secondary

Deposit

STIBNITE BEARING QUARTZ VEIN 2-12 INCHES THICK OCCUPIES FISSURE IN MONZONITE. STIBNITE DEPOSITED AFTER QUARTZ WITH MINOR CINNABAR AND PYRITE. STIBNITE OCCURS IN GRANULAR AGGREGATES THROUGH WHICH ARE SCATTERED GRAINS AND CRYSTALS OF VITREOUS QUARTZ; MOST ABUNDANT IN WIDEST PART OF VEIN.

THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

Location Info

Yukon-Koyukuk , Alaska County / State

Continent Country State County
North America The United States Alaska n/a

Notes

USGS MF-363, LOC. 9. 1/2 MILE SOUTH OF MOUTH OF BLACK CREEK. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2, 500, 000 SCALE OWNERSHIP STATUS MAP (1991).

Meridian / Township / Range Description

Meridian^? Township^? Section^? Aliquot^?
Seward Meridian T.27N R.47W Sec. 11 -

Mining Districts

Formal or informal mining district names.

District
Iditarod Mining District

Development

IN 1956 THE USBM DUG 12 BULLDOZER TRENCHES (SEE REF 3, P. 12) ON THE SLOPE OF THE RIDGE BETWEEN GLEN GULCH AND THE VALLEY OF BLACK CREEK. THE TRENCHES EXPOSED THE QUARTZ MONZONITE BEDROCK FOR 2, 400 FEET NORTHWESTWARD FROM THE CONTACT ZONE. ONLY A FEW MINERALIZED STRINGERS WERE FOUND AND SAMPLED. NO SIGNIFICANT CINNABAR MINERALIZATION WAS FOUND IN PLACE. SOME VEINS AND VEINLETS SHOWED FAIR GOLD VALUES.

Materials

Minerals or other materials present in the mine.

Role^? Material^?
Gangue/Waste Pyrite
Ore Cinnabar
Ore Stibnite

Orebody

Characteristics of the ore body.

Thickness: 0.30 meters (0.98 feet)

Rocks

Geological materials at the site.

Class^? 1st Order Name^? 2nd Order Name^? 3rd Order Name^? 4th Order Name^? Most Specific Name^? Begin Time End Time Description^?
Host Rock Plutonic Rock Granitoid Quartz Monzonite - Quartz Monzonite Pliocene Pliocene -

Nearby Deposits

Other deposits in the same region.

Nearby Places

Flat (2.46 miles away)

Nearby Mining Districts

Iditarod Mining District (0 miles away)

Footnotes

* Mine bounds on map indicate the general area that a mine occupies. For an detailed map, refer to the overseeing BLM field office.

** The mine central point is based on an average of the mine's bounding box(es) and does not necessarily fall on the claim itself.

¹ World-class significance is determined by total endowment of the contained commodity. This includes all past production and remaining reserves. Each commodity is considered separately and commodities cannot be combined to arrive at a significant size. The tonnage thresholds are from the mine model grade-tonnage studies. As of June 2008, many entries were classified as significant under less strict rules.

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