Carboniferous Valerianov magmatic arc

Carboniferous Valerianov magmatic arc
Tract ID 142pCu8005
Country Kazakhstan-Russian Federation
Commodity Cu
Study area name West Central Asia
Tectonic setting continental margin
Deposit type porphyry copper
Grade-tonnage model General porphyry copper model (Singer and others, 2008)
Geologic age
Geologic feature age Carboniferous
Generalized age Paleozoic
Oldest rocks age 359.2Ma
Youngest rocks age 299Ma
Age range 60.2Ma
Identified Cu resources 2,100,000metric tons
Known prospects 3
Mean Cu (t/sq km) 70t/sq km
Map scales used 200K, 1.5M

Results of the assessment

Assessment date 2011
Estimators Byron R. Berger, Jane M. Hammarstrom, Mark J Mihalasky, Jeffrey D. Phillips, Gilpin R Robinson, Michael L. Zientek
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
3 50%
8 10%
15 5%
15 1%
Mean estimated deposits 4.13 ±4.25 (1.03%)
Probability of mean 0.29
Probability of no copper 0.17

Estimated deposit density

(sq km)
Deposit density
per 100,000 sq km
2 6.13 213,240 3

Mean estimated tonnage

Copper 15,000,000
Molybdenum 410,000
Gold 390
Silver 5,200
Ore 3,000

Undiscovered copper resource

Confidence level 50% 10% 5%
Tonnage 5,900,000 37,000,000 62,000,000

Economic analysis

Fraser country Kazakhstan
Fraser type 0.22%
Fraser high 0.79%
Typical cost 0%
High cost 1%
Infrastructure setting High cost
Comments on depth skew deep; almost complete cover; spotty I and V along W edge
Expected depth distribution
0 - 250m 0.1
250m - 500m 0.3
500m - 1km 0.6
Economically recoverable resources
Copper 6,700,000t
Molybdenum 150,000t
Gold 120t
Silver 2,300t
Probability no econ recoverable 0.72
Econ NPV 1,200x $1M
Exp dollars 1.6x $1M/100,000 sq km
Exp value class Very Low

Bibliographic references

General Berger and others (2014)
Economic Robinson and Menzie (2012)

Deposits and prospects associated with this tract

Name Type State Country Development Details
Benkala North deposit Aqtöbe oblysy Kazakhstan Producer Details
Benkala South prospect Aqtöbe oblysy Kazakhstan Occurrence Details
Spiridonovskoe prospect Qostanay oblysy Kazakhstan Occurrence Details
Varvarinskoe deposit Qostanay oblysy Kazakhstan Producer Details
Bataly prospect Qostanay oblysy Kazakhstan Occurrence Details