Yulong

A curvilinear belt of post-subduction Eocene igneous rocks in southwest China
Tract ID 142pCu8710
Country China
Commodity Cu
Study area name Tibetan Plateau
Tectonic setting postconvergence
Deposit type porphyry copper
Grade-tonnage model General porphyry copper model (Singer and others, 2008)
Geologic age
Geologic feature age Eocene
Generalized age Tertiary-Paleogene
Oldest rocks age 55.8Ma
Youngest rocks age 33.9Ma
Age range 21.9Ma
Identified Cu resources 11,000,000metric tons
Known prospects 7
Mean Cu (t/sq km) 285t/sq km
Map scales used 500K, 1M

Results of the assessment

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

Estimated number of deposits

Number of deposits Confidence level
3 90%
6 50%
18 10%
18 5%
18 1%
Mean estimated deposits 8.5 ±5.67 (0.67%)
Probability of mean 0.34
Probability of no copper 0.03

Estimated deposit density

Known
deposits
Total
deposits
Area
(sq km)
Deposit density
per 100,000 sq km
6 14.5 112,470 13

Mean estimated tonnage

Copper 32,000,000
Molybdenum 910,000
Gold 820
Silver 11,000
Ore 6,600

Undiscovered copper resource

Confidence level 95% 90% 50% 10% 5%
Tonnage 830,000 2,700,000 20,000,000 76,000,000 110,000,000

Economic analysis

Fraser country China (Vietnam proxy*)
Fraser type 0.18%
Fraser high 0.82%
Typical cost 0%
High cost 1%
Infrastructure setting High cost
Comments on depth default
Expected depth distribution
0 - 250m 0.25
250m - 500m 0.25
500m - 1km 0.5
Economically recoverable resources
Copper 16,000,000t
Molybdenum 350,000t
Gold 280t
Silver 5,200t
Probability no econ recoverable 0.32
Econ NPV 2,800x $1M
Exp dollars 18.79x $1M/100,000 sq km
Exp value class Medium

Bibliographic references

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

Deposits and prospects associated with this tract

Name Type State Country Development Details
Xiariduo prospect Xizang China Prospect Details
Hengxingcuo prospect Xizang China Prospect Details
Yulong deposit Xizang China Producer Details
Zhanaga deposit Xizang China Prospect Details
Mangzhong deposit Xizang China Prospect Details
Duoxiasongduo deposit Xizang China Prospect Details
Malasongduo deposit Xizang China Prospect Details
Gegongnong deposit Xizang China Prospect Details
Narigongma prospect Qinghai China Prospect Details
Ridanguo prospect Qinghai China Prospect Details
Jicuo prospect Xizang China Prospect Details
Seli prospect Xizang China Prospect Details
Mamupu prospect Xizang China Prospect Details
Lurige prospect Qinghai China Prospect Details