lähtekavandina

Lähtekavandina is a term used in Estonian-language geology and mining literature to denote ore deposits that are considered the primary or original source of metals in a mining district. The word is formed from Estonian components meaning “source” and “deposit,” and the exact formulation of its usage can vary between authors and regions. It is not universally standardized, and its meaning is largely defined by context within geological studies.

In practice, lähtekavandina refers to ore bodies that are linked to the initial mineralizing event responsible for concentrated metal concentrations in an area. These deposits are typically discussed as the main sources tapped during the early phases of exploration and mining, and they are often contrasted with secondary or redistributed concentrations formed by later geological processes such as weathering, hydrothermal remobilization, or placer deposition. The classification hinges on geological origin, timing, and association with primary mineralizing events rather than on extractive value alone.

Identification of sources labeled as lähtekavandina relies on a combination of petrographic examination, geochemical and isotopic analyses, and the study of alteration halos and host rock context. Proponents emphasize a link between these deposits and a defined genesis pathway, while critics note that the boundaries between “primary” and “secondary” sources can be fluid in complex mineral districts.

See also: ore deposit, mineral genesis, hydrothermal ore deposits, ore metallurgy.

References to lähtekavandina appear primarily in Estonian geological glossaries and research articles on regional mineral resources; readers are advised to consult local geological surveys and peer-reviewed geology literature for specific definitions in different contexts.