U.S. Geological Survey

Grade and Tonnage Model of
Porphyry Copper Deposits in
British Columbia, Canada, and
Alaska, U.S.A.

By W. David Menzie and Donald A. Singer

U.S. Geological Survey Open-File Report 93-0275

This publication is a sub-model to the descriptive and grade-tonnage
model of Porphyry Copper (No. 17) published in USGS Bulletin 1693,
"Mineral Deposit Models" (D.P. Cox and D.A. Singer, editors, 1986).
The significant differences in the tonnages and grades of deposits in
British Columbia and Alaska are the basis for the subset presented here.

Originally published in 1993, this report is presented here in
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For more information about this report contact William D. Heran at wheran@usgs.gov