Mining Glossary: A Friendly Guide to Mining

Assay: A test conducted to determine the composition and value of a mineral sample.

Cut-off Grade: The minimum grade at which a unit of ore will be mined to achieve a specific objective.

Deposit: A concentration of mineral matter that is of economic interest.

Drilling: The process of creating holes in the earth to explore for minerals.

Exploration: The search for mineral deposits through geological surveys, drilling, sampling, and other methods.

Feasibility Study: An assessment of the practicality and economic viability of a proposed mining project.

Grade: The concentration of a valuable mineral within ore, expressed as a percentage or in grams per tonne (g/t).

Heap Leaching: An industrial process used to extract precious metals, copper, uranium, and other compounds from ore via a series of chemical reactions that absorb specific minerals and re-separate them after their division from other earth materials.

Indicated Resource: The part of a mineral resource for which quantity, grade or quality, densities, shape, and physical characteristics can be estimated with a reasonable level of confidence.

Inferred Resource: An estimate of mineral resources based on limited geological evidence and sampling.

Measured Resource: The part of a mineral resource for which quantity, grade or quality, densities, shape, and physical characteristics are so well established that they can be estimated with confidence.

Metallurgy: The science and technology of extracting metals from their ores and refining them.

Mineral Reserve: The economically mineable part of a measured or indicated mineral resource.

Ore: A naturally occurring solid material from which a metal or valuable mineral can be profitably extracted.

Porphory Deposit: A porphyry deposit is a significant mineral deposit that typically contains disseminated metals such as copper, molybdenum, and gold. These deposits form in large, hydrothermally altered, intrusive igneous rocks called porphyritic rocks. The metal content is generally spread throughout the rock in small amounts, but because of the vast size of these deposits, they can be economically viable to mine.

Prospecting: The initial search for mineral deposits, often involving fieldwork and geological surveys.

Reclamation: The process of restoring land that has been mined to a natural or economically usable state.

Sampling: The process of taking a small portion of a mineral deposit to analyze its composition.

Smelting: The process of extracting metal from its ore by heating and melting.

Tailings: The materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore.

Vein: A distinct sheet-like body of crystallized minerals within a rock.

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