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1. Ore Deposits

   Linked via "crustal abundance"

   Ore deposits are naturally occurring concentrations of minerals or rocks that can be mined at a profit. These concentrations, often vastly exceeding the average crustal abundance of the constituent elements, are the result of specific, usually protracted, geological and geochemical processes [1]. The economic viability of an ore deposit is contingent upon the market price of the metal, the grade (concentration) of the ore, and the complexity of extraction metallurgy [2].
   Classification by…

2. Ore Deposits

   Linked via "crustal abundance"

   Metamorphic Enrichment Factor
   The enrichment factor ($Ef$) of an element in an ore deposit relative to its average crustal abundance ($C{\text{crust}}$) is critical for economic assessment:
   $$Ef = \frac{C{\text{ore}}}{C_{\text{crust}}}$$