GRADE AND TONNAGE MODEL OF POLYMETALLIC REPLACEMENT DEPOSITS
By Dan L. Mosier, Hal T. Morris, and Donald A. Singer
COMMENTS Carbonate-hosted replacement and transitional vein and other replacement deposits are included. Only districts with combined production and reserves of at least 100,000 tonnes are used. Tonnages for many districts, particularly in the U.S. are biased because only production data were available. The break in slope in the zinc grade plot at about 1 percent may be related to early difficulties of processing zinc oxides, and the consequent underreporting of zinc grades where estimates were based on production. Lead grade is correlated with silver (r = 0.55, n = 45). See figs. 69-74.
Figure 69. Tonnages of polymetallic replacement deposits.
Figure 70. Lead grades of polymetallic replacement deposits.
Figure 71. Zinc grades of polymetallic replacement deposits.
Figure 72. Copper grades of polymetallic replacement deposits.
Figure 73. Silver grades of polymetallic replacement deposits.
Figure 74. Gold grades of polymetallic replacement deposits.
DEPOSITS
Name Country
American Fork USUT
Atacocha PERU
Bell USNV
Big Cottonwood-L.C. USUT
Blue Bell CNBC
Bolkardag TRKY
Bristol (Jack Rabbit) USNV
Cerro Gordo USCA
Chalchihuites MXCO
Charcas MXCO
Cortez USNV
Darwin USCA
Drina YUGO
East Tintic USUT
El Porvenir (Milpo) PERU
Eureka USNV
Hunnan CINA
La Encantada MXCO
La Reforma MXCO
Lampazos MXCO
Laurium GREC
Liaoning CINA
Lone Mountain USNV
Magdalena USNM
Maria Christina CILE
Mazapil MXCO
Nakatatsu JAPN
Mitate JAPN
Naica MXCO
New Calumet CNQU
Olympias Chalkidiki GREC
Ophir USUT
Park City USUT
Plomosas MXCO
Rush Valley USUT
San Francisco USUT
Santa Eulalia MXCO
Santander PERU
Sasa-Toranica YUGO
Silva-Aysen CILE
Sombrerete MXCO
Spruce Mountain USNV
Star USUT
Sumadisa YUGO
Tecopa USCA
Tintic USUT
Tombstone USAZ
Trepca-Kopaonik YUGO
Velardepa MXCO
White Pine USNV
Yellow Pine USNV
Zimapan MXCO