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Maramuni Arc

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Miocene Maramuni magmatic arc
Tract ID 009pCu7205
Country Papua New Guinea
Commodity Cu
Study area name Southeast Asia and Melanesia
Tectonic setting continental margin
Deposit type porphyry copper
Grade-tonnage model Porphyry copper, Cu-Au subtype (Singer and others, 2008)
Geologic age
Geologic feature age middle Miocene
Generalized age Tertiary-Neogene
Oldest rocks age 15.97Ma
Youngest rocks age 11.608Ma
Age range 4.362Ma
Identified Cu resources 8,600,000metric tons
Known prospects 3
Mean Cu (t/sq km) 254t/sq km
Map scales used 250K, 1M

Results of the assessment

Assessment date 2010
Estimators Gilpin R. Robinson, Jr., Steve Ludington, Jane M. Hammarstrom, Michael L. Zientek, Arthur A. Bookstrom, Alexander Yan Sze Wah, Bambang Setiabudi, Dwi Sunuhadai
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
2 50%
8 10%
8 5%
8 1%
Mean estimated deposits 3.2 ±2.97 (0.93%)
Probability of mean 0.28
Probability of no copper 0.2

Estimated deposit density

Known
deposits		 Total
deposits		 Area
(sq km)		 Deposit density
per 100,000 sq km
1 4.2 38,975 11

Mean estimated tonnage

Copper 9,900,000
Molybdenum 56,000
Gold 710
Silver 3,200
Ore 2,000

Undiscovered copper resource

Confidence level 50% 10% 5%
Tonnage 3,300,000 27,000,000 44,000,000

Economic analysis

Fraser country Papua New Guinea
Fraser type 0.08%
Fraser high 0.92%
Typical cost 0%
High cost 1%
Infrastructure setting High cost
Comments on depth skew shallow
Expected depth distribution
0 - 250m 0.35
250m - 500m 0.25
500m - 1km 0.4
Economically recoverable resources
Copper 5,100,000t
Molybdenum 21,000t
Gold 260t
Silver 1,600t
Probability no econ recoverable 0.64
Econ NPV 1,000x $1M
Exp dollars 8.97x $1M/100,000 sq km
Exp value class Low

Bibliographic references

General Hammarstrom and others (2013)
Economic Robinson and Menzie (2012)
Hammarstrom, J.M., Bookstrom, A.A., Dicken, C.L., Drenth, B.J., Ludington, S., Robinson, G.R., Jr., Setiabudi, B.T., Sukserm, W., Sunuhadi, D.N., Wah, A.Y.S., and Zientek, M.L., with contributions from Cox, D.P., Jarnyaharn, P., Kopi, G., Ngoc, N.T.M., Otarawanna, P., Pei, C.S., Phany, U., Van Quy, Sakimoto, T., Saroa, D., Soares da Costa, N., Sotham, S., Sim, I.M., Trung, N.N., Wongsomasak, S., Yokarti, B., and Zaw, K., 2013, Porphyry copper assessment of Southeast Asia and Melanesia: U.S. Geological Survey Scientific Investigations Report 2010–5090–D, 332 p., http://pubs.usgs.gov/sir/2010/5090/d/.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
Salumei prospect East Sepik Papua New Guinea Prospect Details
Bismarck prospect Enga Papua New Guinea Prospect Details
Wasi prospect East Sepik Papua New Guinea Prospect Details
Frieda River deposit Sandaun Papua New Guinea Prospect Details