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Chukotka

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Early to Late Cretaceous volcanic and intrusive rocks composing island-arc, continental-arc, and collisional magmatic belts associated with the Chukotka microcontinent.
Tract ID 142pCu8513
Country Russian Federation
Commodity Cu
Study area name Northeast Asia
Tectonic setting mixed
Deposit type porphyry copper
Grade-tonnage model General porphyry copper model (Singer and others, 2008)
Geologic age
Geologic feature age Cretaceous
Generalized age Mesozoic
Oldest rocks age 145.5Ma
Youngest rocks age 65.5Ma
Age range 80Ma
Known prospects 1
Mean Cu (t/sq km) 57t/sq km
Map scales used 1M, 1.5M

Results of the assessment

Assessment date 2010
Estimators Alexeiev, D. (Russian Academy of Sciences); Bookstrom, Arthur A.(USGS); Frost, Thomas P. (USGS); Hammarstrom, Jane M. (USGS); Light, Thomas D. (USGS); Ludington, Steve (USGS); Mihalasky, Mark, J. (USGS); Panteleyev, Andre (XDM Geological Consultants)
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
2 50%
6 10%
12 5%
12 1%
Mean estimated deposits 3.05 ±3.39 (1.11%)
Probability of mean 0.27
Probability of no copper 0.2

Estimated deposit density

Known
deposits		 Total
deposits		 Area
(sq km)		 Deposit density
per 100,000 sq km
3.05 210,360 1

Mean estimated tonnage

Copper 12,000,000
Molybdenum 320,000
Gold 290
Silver 3,700
Ore 2,400

Undiscovered copper resource

Confidence level 50% 10% 5%
Tonnage 3,500,000 30,000,000 50,000,000

Economic analysis

Fraser country Russian Federation
Fraser type 0.12%
Fraser high 0.88%
Typical cost 0%
High cost 1%
Infrastructure setting High cost
Comments on depth shallow
Expected depth distribution
0 - 250m 0.35
250m - 500m 0.25
500m - 1km 0.4
Economically recoverable resources
Copper 6,300,000t
Molybdenum 130,000t
Gold 110t
Silver 1,800t
Probability no econ recoverable 0.67
Econ NPV 1,100x $1M
Exp dollars 2.04x $1M/100,000 sq km
Exp value class Low

Bibliographic references

General Mihalasky, Ludington, Alexeiev, and others (2015)
Economic Robinson and Menzie (2012)
Mihalasky, M.J., Ludington, Steve, Alexeiev, D.V., Frost, T.P., and Light, T.D., with contributions from Bookstrom, A.A., and Panteleyev, Andre, 2015, Porphyry copper assessment of northeast Asia—Far East Russia and northeasternmost China: U.S. Geological Survey Scientific Investigations Report 2010–5090–W, 104 p., http://pubs.usgs.gov/sir/2010/5090/W/.Robinson, G.R., Jr., and Menzie, W.D., 2012, Economic filters for evaluating porphyry copper deposit resource assessments using grade-tonnage deposit models, with examples from the U.S. Geological Survey global mineral resource assessment (ver 1.2, March 2014): U.S. Geological Survey Scientific Investigations Report 2010–5090–H, 21 p., http://pubs.usgs.gov/sir/2010/5090/h/.

Deposits and prospects associated with this tract

Name Type State Country Development Details
Shurykan prospect Chukotskiy avtonomnyy okrug Russian Federation Unknown Details