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Defintions

General information
Definicje

Solid mineral commodities

  • D – inferred resources – mineral deposit boundaries, geological feature and anticipated resources are evaluated on the basis of available geological data, in particular from isolated excavations or natural outcrops, geological interpretation of geophysical measurements. The admissible error of average deposit parameters and deposit resources estimation may exceed 40%.

  • C2 – inferred resources - mineral deposit boundaries are evaluated on the basis of available data from isolated excavations, natural outcrops, interpolation or extrapolation of geophysical measurements; main structural and geological features and tectonics are recognized; geological-mining conditions of exploitation are preliminary evaluated; quality of mineral commodity is evaluated on the basis of regular sampling in the full range of commodity usage. The admissible error of average deposit parameters and deposit resources estimation can not exceed 40%.

  • C1 – indicated resources - mineral deposit boundaries are evaluated on the basis of available data from exploratory excavations, natural outcrops or interpolation or extrapolation of geophysical measurements; the grade of deposit exploration allows to prepare the prefeasibility study of economic mining, including the detailed delineation of structural and geological features, tectonics and quality of mineral commodity in the deposit, geological-mining conditions of exploitation, and allows to asses the influence of the intended exploitation on environment. The admissible error of average deposit parameters and deposit resources estimation can not exceed 30%.

  • B – measured resources - mineral deposit boundaries are delineated in details on the basis of the specially carried out exploratory excavations or geophysical measurements, the delineation of structural and geological features, correlation of strata, main tectonics features has to be unambiguous, quality and technological properties of mineral commodity should be confirmed by the sampling results in pilot-scale tests or commercial scale. The degree of the deposit exploration is sufficient enough to elaborate the mine management plan. The admissible error of average deposit parameters and deposit resources estimation can not exceed 20%.

  • A – measured resources – mineral deposit is explored to the extend which allows the current planning and carrying out the exploitation with the maximum possible rate of resources absorption; the delineation of structural and geological features, tectonics, resources on the basis of the opening-out, preparing and mining excavations, the type, quality and technological properties of mineral commodity on the basis of regular excavations sampling and data from the current production is required. The degree of the deposit exploration is sufficient enough to elaborate the mine management plan. The admissible error of average deposit parameters and deposit resources estimation in particular blocks can not exceed 10%.

According to the Regulation of the Minister of the Environment (number of Polish act: Dz. U. poz. 987)

Hydrocarbons

  • C – inferred resources - hydrocarbons field boundaries are delineated on the basis of geophysical measurements and geological interpretation; such data allow to plan other works which are necessary to continue field exploration or its exploitation, when there is gas, oil or methane flow from at least one well in the amount of economic value or, in the case of the multi-horizontal fields, when the hydrocarbons saturation of gas and oil horizons is known on the basis of the drilling geophysics logging with gas, oil or methane flow from at least one well in the amount of economic value. The admissible error of average field parameters and field resources estimation can not exceed 50%.

  • B – indicated resources – the result of geological works carrying out are the basis to define the field geological structure, field boundaries and reservoir parameters of oil bearing and gas bearing formations as well as their variability in details; such data allow to plan other works which are necessary to continue field exploration or its exploitation, when there is gas, oil or methane flow from at least one well in the amount of economic value. The admissible error of average field parameters and field resources estimation can not exceed 35%.

  • A – measured resources – data for category B are defined on the basis of exploitation results. The admissible error of average field parameters and resources estimate is up to 20%.

According to the Regulation of the Minister of the Environment (number of Polish act: poz. 968)