lähtevarude

Lähtevarude is a term used in some Nordic and Baltic language contexts to denote the portion of natural resources that can be economically extracted and produced under current technology and market conditions. It identifies the recoverable part of resources that exists in the ground, distinguishing it from broader resource estimates that may not be economically viable to mine or extract at present.

Reserves are typically classified by confidence and economic viability into categories such as proved (proven) reserves, probable reserves, and possible reserves. The exact definitions vary by country and organization, but the general idea is to separate what can be extracted under prevailing prices and technology from resources that would require higher prices, additional technology, or further exploration.

Assessments rely on geological surveys and energy agencies. Quantities are reported in units such as barrels of oil equivalent, tonnes, or cubic meters. A common shorthand is the reserves-to-production ratio (R/P), indicating how many years current lähtevarude would last at current production rates. These figures are inherently uncertain and subject to revision as new data becomes available.

Lähtevarude numbers influence energy security, investment, taxation, and long-term planning. They change with new discoveries, technological advances, price shifts, and policy developments. Sustainable planning thus requires considering uncertainties and scenario analysis, especially for non-renewable energy sources and critical minerals. Common examples include fossil fuels—oil, natural gas, and coal—and mineral resources such as copper, iron ore, and uranium, all of which are regularly updated by national authorities and international organizations.