grenseverditeoremer

Grenseverditeoremer are a conceptual category used in mineralogy and mining to refer to ore minerals whose status as ore and their economic value are governed by boundary values of physical, chemical, or economic parameters. In practice they mark the transition between material that is not economically recoverable and material that can be mined profitably, given a specific price, cost structure, and processing capability.

The term blends grenseverdi, boundary value, with ore minerals. It is used especially in exploration and resource estimation to denote minerals that indicate when the ore grade or metallurgical response crosses a defined economic threshold. This concept supports the interpretation of grade distributions and helps define cut-off grades for reporting reserves.

Grenseverditeoremer tend to form or become recognizable at the margins of ore-forming processes or during zoning of deposits, where small changes in grade or processing efficiency shift the economic viability. They may occur as part of gangue associations, alteration halos, or within sulfide assemblages that are sensitive to processing chemistry.

Economic and mining implications include influencing resource estimates, mine planning, and risk assessment. The identification of grenseverditeoremer relies on integrated data from sampling, assaying, metallurgical tests, and economic modelling, as well as observation of mineral associations that reflect processing behavior.

Common methods to study grenseverditeoremer include bulk sampling, bench and pilot-scale metallurgical tests, and geostatistical modelling to map how close a given block lies to the economic cut-off. The concept is aligned with, but distinct from, the standard notion of economic cut-off grades and reserve categorization.