1. Proved reserves are such quantities of mineral deposits, at a specific date, as analysis of geological engineering data demonstrates with reasonable certainty to be recoverable in the future under the same economic and operational conditions. 2. Probable (indicated) reserves are the estimated quantity and grade of a mineralized body for which sufficient information on continuity, extent, grade, operating and capital costs, etc. is available on the basis of a study indicating an economically viable operation at long-term forecast average mining prices. 3. Established (demonstrated) resources are the sum of (1) and (2). 4. Possible (inferred) resources are resources for which quantitative estimates are based largely on broad knowledge of the geological character of the deposit and for which there are few, if any, samples of measurements.