East Qinling

A linear belt of Jurassic and Cretaceous post subduction intrusive rocks in central China
Tract ID 142pCu8705
Country China
Commodity Cu
Study area name East Asia Mesozoic
Tectonic setting postconvergence
Deposit type porphyry copper
Grade-tonnage model Porphyry copper, Cu-Mo subtype (Singer and others, 2008)
Geologic age
Geologic feature age Jurassic and Cretaceous (Yanshanian)
Generalized age Mesozoic
Oldest rocks age 199.6Ma
Youngest rocks age 65.5Ma
Age range 134.1Ma
Identified Cu resources 390,000metric tons
Known prospects 6
Mean Cu (t/sq km) 304t/sq km
Map scales used 500K, 1M, 1.5M, 2.5M

Results of the assessment

Assessment date 2010
Estimators Jane M. Hammarstrom, Steve Ludington, Gilpin R. Robinson Jr.
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
1 90%
3 50%
12 10%
12 5%
12 1%
Mean estimated deposits 5.03 ±4.15 (0.83%)
Probability of mean 0.31
Probability of no copper 0.07

Estimated deposit density

(sq km)
Deposit density
per 100,000 sq km
1 6.03 171,104 4

Mean estimated tonnage

Copper 52,000,000
Molybdenum 2,400,000
Gold 130
Silver 22,000
Ore 9,300

Undiscovered copper resource

Confidence level 90% 50% 10% 5%
Tonnage 410,000 19,000,000 150,000,000 200,000,000

Economic analysis

Fraser country China
Fraser type 0.52%
Fraser high 0.48%
Typical cost 0.52%
High cost 0.48%
Infrastructure setting Mixed
Comments on depth default
Expected depth distribution
0 - 250m 0.25
250m - 500m 0.25
500m - 1km 0.5
Economically recoverable resources
Copper 38,000,000t
Molybdenum 1,100,000t
Gold 76t
Silver 14,000t
Probability no econ recoverable 0.07
Econ NPV 8,300x $1M
Exp dollars 44.66x $1M/100,000 sq km
Exp value class High

Bibliographic references

General Ludington, Mihalasky, and others (2012)
Economic Robinson and Menzie (2012)

Deposits and prospects associated with this tract

Name Type State Country Development Details
Jinduicheng deposit Shaanxi China Producer Details
Yemaquan prospect Qinghai China Prospect Details
Wenquan prospect Gansu China Prospect Details
Taiyangshan prospect Gansu China Prospect Details
Deemi prospect Qinghai China Prospect Details
Dan Feng prospect Shaanxi China Prospect Details
Qiushuwan prospect Henan China Prospect Details
Jiangligou prospect Shanxi China Prospect Details
Luocun prospect Henan China Prospect Details