oreinnivåer

Oreinnivåer, in Norwegian mining geology, refer to discrete levels within an ore deposit where mineralization is concentrated. The term is used to describe vertical segmentation of ore bodies for mapping, sampling, and planning. Levels may correspond to geological features such as vein zones, breccia pods, or stratigraphic units, and serve as practical units for describing ore continuity and grade distribution.

Identification and mapping: Oreinnivåer are identified through drilling and core logging, downhole surveys, and geological modeling. Data are organized into level sections that list thickness, indicated ore grade, and expected tonnage per level. Grading is expressed in standard units such as percent for base metals or grams per tonne (g/t) for precious metals.

Application to mining: The level-based approach supports mine planning, reserve estimation, and grade control. By knowing how grade and tonnage vary between levels, planners can optimize extraction sequencing, determine cut-off grades, and design ventilation and ore transport paths. It also aids reporting and economic evaluation by presenting the deposit in a series of manageable units.

Limitations: Oreinnivåer reflect a practical representation of a complex, three-dimensional ore body. Grades can vary within a level, and levels can merge or split due to structural or lithological changes. The exact definition and scope of the term may vary between projects, and it is primarily a descriptive concept used in Norwegian-language literature and practice.

In research and industry practice, oreinnivåer are often integrated into geostatistical models and block models to generate reserve estimates and to support decision making.