Yukon-Tanana Upland

Kluane Arc and Tertiary Kuskokwim Mountains volcanic-plutonic belt (continuation of Canadian Cordilleran continental arc); north of the Denali Fault
Tract ID 003pCu5003
Country United States of America
Commodity Cu
Study area name United States revised - Alaska
Tectonic setting continental margin
Deposit type porphyry copper
Grade-tonnage model Canadian Cordillera Porphyry Cu±Mo±Au (Frost and others, 2011)
Geologic age
Geologic feature age Tertiary
Generalized age Tertiary
Oldest rocks age 60Ma
Youngest rocks age 0Ma
Age range 60Ma
Identified Cu resources 2,200,000metric tons
Mean Cu (t/sq km) 45t/sq km
Map scales used 250K

Results of the assessment

Assessment date 2012
Estimators Steve Ludington, Jane Hammarstrom, Gilpin Robinson, and 1996 Team
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
2 90%
8 50%
10 10%
14 5%
18 1%
Mean estimated deposits 7.09 ±3.97 (0.56%)
Probability of mean 0.42
Probability of no copper 0.04

Estimated deposit density

Known
deposits
Total
deposits
Area
(sq km)
Deposit density
per 100,000 sq km
2 9.09 200,550 5

Mean estimated tonnage

Copper 9,100,000
Molybdenum 390,000
Gold 470
Silver 3,200
Ore 3,400

Undiscovered copper resource

Confidence level 95% 90% 50% 10% 5%
Tonnage 290,000 1,200,000 7,900,000 18,000,000 22,000,000

Economic analysis

Fraser country US-Alaska
Fraser type 0.23%
Fraser high 0.76%
Typical cost 0%
High cost 1%
Infrastructure setting High cost
Comments on depth skew deep
Expected depth distribution
0 - 250m 0.1
250m - 500m 0.3
500m - 1km 0.6
Economically recoverable resources
Copper 210,000t
Molybdenum 5,100t
Gold 0t
Silver 40t
Probability no econ recoverable 0.98
Econ NPV 15x $1M
Exp dollars -7.55x $1M/100,000 sq km
Exp value class Very Low

Bibliographic references

General U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Economic Robinson and Menzie (2012)

Deposits and prospects associated with this tract

Name Type State Country Development Details
Airplane Ridge prospect Alaska United States Prospect Details
Baggage prospect Alaska United States Prospect Details
Bluff prospect Alaska United States Prospect Details
Boulder Creek prospect Alaska United States Prospect Details
Bush prospect Alaska United States Prospect Details
Elephant Mountain prospect Alaska United States Prospect Details
Little Enchilada prospect Alaska United States Prospect Details
McLeod prospect Alaska United States Prospect Details
Mosquito prospect Alaska United States Prospect Details
Mount Fairplay prospect Alaska United States Prospect Details
Oreo prospect Alaska United States Prospect Details
Peternie prospect Alaska United States Prospect Details
Pika Canyon prospect Alaska United States Prospect Details
Ptarmigan Creek prospect Alaska United States Prospect Details
Pushbush prospect Alaska United States Prospect Details
Quartz-Porphyry prospect Alaska United States Prospect Details
Round Top deposit Alaska United States Occurrence Details
Round Top prospect Alaska United States Prospect Details
Section 21 prospect Alaska United States Prospect Details
Taurus deposit Alaska United States Prospect Details
Triple Z prospect Alaska United States Prospect Details
North Peternie prospect Alaska United States Prospect Details
Shady Ridge prospect Alaska United States Prospect Details