Kopparcores

Kopparcores are cylindrical rock samples obtained by core drilling in copper-bearing deposits as part of mineral exploration and evaluation. The term blends the Swedish koppar for copper with the English core, reflecting its use in Scandinavian contexts to describe core samples that reveal subsurface ore characteristics.

Extraction and handling: Kopparcores are produced using diamond-tipped drill bits that preserve rock integrity. Core diameters typically range from about 5 to 10 centimeters and can extend for several meters per drill hole. After retrieval, cores are marked, logged, and sealed in core boxes. Subsamples are taken at defined intervals for laboratory analysis, while the remaining material supports geological logging.

Composition and variation: Kopparcores commonly contain copper sulfide minerals such as chalcopyrite and bornite, sometimes accompanied by copper oxides and sulfates, depending on the host rock and alteration history. The cores reveal mineral zoning, grain size, and the presence of accessory minerals, all of which influence metallurgical tests and ore grade estimation.

Use and significance: The primary purpose of kopparcores is to determine copper grade, distribution, and metallurgical characteristics beneath the surface. They inform resource estimation, mine planning, and processing design, helping to assess project viability and guide decisions on further drilling and development.

Quality control and environment: Standard QA/QC procedures apply to sampling and assays, and drill sites require environmental and safety controls, including handling of drill cuttings, groundwater management, and rehabilitation after drilling.

See also: core sample, diamond drill, copper ore, mineral exploration.