Making the grade: understanding exploration results - MINING.COM
In this style of mining $100 per tonne gross metal value is interesting and $500 per tonne is considered to be high-grade. Again considering 1% of a tonne equals 22 pounds then we would need 4.5%.
SEDEX: The Biggest Lead and Zinc Deposits in the World .
Discovered over 100 years ago the Sullivan deposit was the largest SEDEX deposit in Canada producing 116 million tonnes of zinc 5.8 % Zn and lead 6.7 % Pb . The mine is no longer producing but Santa Fe Metals and Eagle Plains Resources are pursuing SEDEX prospects in the area.
Sediment-Hosted Zinc-Lead Deposits of the World— Database and .
Sediment-Hosted Zinc-Lead Deposits of the World— Database and Grade and Tonnage Models . By Donald A. Singer1 Vladimir I. Berger1 and Barry C. Moring1. Open-File Report 2009-1252
SGA News 15
Today the attraction of these deposits includes the scale economy individual projects mostly exceed 100.000 tons zinc metal and the projected low processing costs for the production of zinc metal or high-grade zinc oxide on site Large 2001 .
Mississippi Valley-Type MVT Lead-Zinc Deposits Geology .
Ore grades in an economic deposit typically range from 4-15 % lead-zinc. The high grades combined with the soft sedimentary host rock and concentrated structural formation make MVT deposits particularly easy to mine – when commodity prices are good.
CU AU AND ZN-PB SKARN DEPOSITS MODELS 18bc; Cox and .
they are also classified by the most economically important metal present coppe r iron lead-zinc gold tin tungsten etc. . Each class of skarn deposit has a characteristic though not necessarily unique size grade tectonic setting granitoid association and mineralogy Einaudi and Burt 1982; Einaudi and others 1981; Meinert 1983 . Not
Zinc ore and mines Minerals and mines Foundations of the .
Zinc ore occurs in two types of deposit: as primary zinc ore in thin veins known as rakes or a secondary deposit formed by weathering of the primary mineral veins. Zinc ore is most commonly found as zinc carbonate ZnCO 3 known as calamine or smithsonite. It generally occurs as rounded crystalline crusts or granular honeycombed masses that .
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