The enrichment ratio (ER) and the ore value (OV), which have been proposed to evaluate polymetallic deposits, provide some valuable suggestions for assessing mineral resources. For examples, on the basis of the variables, all deposits in the world are classified into nine quality categories such as HH (high ER-high OV : 0.7%), HM (high ER-middle OV : 0.7%), HL (high ER-low OV : 0%), MH (0.6%), MM (51%), ML (13%), LH (0.02%), LM (17%) and LL (17%) independently of the commodities. Each category is characterized by some keywords indicating deposit types as follows : Category HH by unconformity and Mississippi Valley, Category HM by vein, Category ML by sandstone, stockwork and dissemination, Category LM by orthomagmatic, laterite, komatiite and chemical, and Category LL by porphyry, dissemination and placer. Category MM is not characterized by any keyword. If the commodities of a deposit are defined by both enrichment ratio and ore value, the defined commodities are relatively similar for gold and nickel, but different for copper, silver and zinc, and greatly different for molybdenum and lead. Among the latter group, deposits containing lead and/or zinc are complimentary. If the commodity Pb + Zn is applied, most of lead or zinc deposits are classified as Pb + Zn by both definitions. Accessory metals are very common for deposits of kuroko-type zinc, epithermal silver, massive sulfide-type zinc and volcanogenic zinc, but uncommon for the deposits of orthomagmatic chromium, chemically precipitated copper and sandstone-type uranium.