IN THIS SECTION
Arrow Salient highlights
Arrow Strategic intent
Arrow Introduction
Arrow Governance
Arrow Group operations at a glance
Arrow Group Mineral Resource and Mineral Reserve Overview
Arrow Assessment and reporting criteria
Arrow Modifying factors
Arrow Exploration expenditure
Arrow Mineral Resource and Mineral Reserve statement
Arrow Mineral Resource and Mineral Reserve per operation
Arrow Mineral Resource and Mineral Reserve depletion and growth
Arrow South Africa Region
Arrow West Africa Region
Arrow Australasia Region
Arrow South America Region
  Growth Projects
  Arrow Arctic Platinum Project
  Arrow West Wits Tailings Processing Project
Arrow Competent Persons
Arrow Abbreviations
Arrow Glossary
   
Click to HIDE this navigation
Click to SHOW this navigation

Glossary

  TERM   DEFINITION
  Block Width   The average width at which it is estimated a block of ore will be mined.
  Cut-off Grade   The lowest grade of mineralised rock which determines as to whether or not it is economic to recover its gold content by further concentration.
  Dilution   Waste or material below the cut-off grade that contaminates the ore during the course of mining operations and thereby reduces the average grade mined.
  Gold Equivalent Ounces   A quantity of metal (such as copper) converted to an amount of gold in ounces, based on accepted gold and other metal prices i.e. The accepted total value of the metal based on its weight and value thereof divided by the accepted value of one troy ounce of gold.
  Indicated Mineral Resource   That part of a Mineral Resource for which tonnage, densities, shape, physical characteristics, grade and mineral content can be estimated with a reasonable level of confidence. It is based on information from exploration, sampling and testing of material gathered from locations such as outcrops, trenches, pits, workings and drill holes. The locations are too widely or inappropriately spaced to confirm geological and/or grade continuity but are spaced closely enough for continuity to be assumed.
  Inferred Mineral Resource   That part of a Mineral Resource for which tonnage, grade and mineral content can be estimated with a low level of confidence. It is inferred from geological evidence and sampling and assumed but not verified geologically or through analysis of grade continuity. It is based on information gathered through appropriate techniques from locations such as outcrops, trenches, pits, workings and drill holes that may be limited or of uncertain quality and reliability.
  Kriging efficiency(KE)   Provides a measure of the reliability of block evaluations.
  Life of Mine (LoM)   Number of years that an operation is planning to mine and treat ore and is derived from the current mining plan.
  Measured Mineral Resource   That part of a Mineral Resource for which tonnage, densities, shape, physical characteristics, grade and mineral content can be estimated with a high level of confidence. It is based on detailed and reliable information from exploration, sampling and testing of material from locations such as outcrops, trenches, pits, workings and drill holes. The locations are spaced closely enough to confirm geological and grade continuity.
  Mill Width   Calculated width expressing the relationship between the total reef area excavated and the total mill tons milled from underground sources.
  Mine Call Factor   The ratio expressed as a percentage which the specific product accounted for in “recovery plus residue” bears to the corresponding product “called for” by the mine’s measuring and evaluation methods.
  Mineral Reserve
(Reserve)
  The economically mineable material derived from a Measured and/or Indicated Mineral Resource. It is inclusive of diluting and contaminating materials and allows for losses that that are expected to occur when the material is mined. Appropriate assessments to a minimum of a Pre-Feasibility Study for a project and a LoM Plan for an operation must have been completed, including consideration of, and modification by, realistically assumed mining, metallurgical, economic, marketing, legal, environmental, social and governmental factors (the modifying factors). Such modifying factors must be disclosed.
  Mineral Resource (Resource)   A concentration or occurrence of material of economic interest in or on the earth’s crust in such form, quality and quantity that there are reasonable and realistic prospects for eventual economic extraction. The location, quantity, grade, continuity and other geological characteristics of a Mineral Resource are known, or estimated from specific geological evidence, sampling and knowledge interpreted from an appropriately constrained and portrayed geological model. Mineral Resources are subdivided, and must be so reported, in order of increasing confidence in respect of geoscientific evidence, into Inferred, Indicated and Measured categories.
  Paylimit   The value at which it is estimated that ore can be mined at break-even.
  Plant Recovery Factor   The ratio expressed as a percentage, of the mass of the specific mineral product actually recovered from ore treated at the plant to its total specific mineral content before treatment.
  Probable Mineral Reserve   Economically mineable material derived from a Measured or Indicated Mineral Resource or both. It is estimated with a lower level of confidence than a Proved Mineral Reserve. It includes diluting and contaminating materials and allows for losses that are expected to occur when the material is mined. Appropriate assessments to a minimum of a Pre-Feasibility Study for a project or a LoM Plan for an operation must have been carried out, including consideration of, and modification by, realistic assumed mining, metallurgical, economic, marketing, legal, environmental, social and governmental factors. Such modifying factors must be disclosed.
  Proved Mineral Reserve   Economically mineable material derived from a Measured Mineral Resource. It is estimated with a high level of confidence. It includes diluting and contaminating materials and allows for losses that are expected to occur when the material is mined. Appropriate assessments to a minimum of a Pre-Feasibility Study for a project or a LoM Plan for an operation must have been carried out, including consideration of, and modification by, realistic assumed mining, metallurgical, economic, marketing, legal, environmental, social and governmental factors. Such modifying factors must be disclosed.
  Tonnage Discrepancy   Difference between the tonnage hoisted as ore and that accounted for by the plant measuring methods. Discrepancy is referred to as a shortfall when the calculated tonnage is less than the tonnage accounted for by the plant, or an excess when the opposite occurs.
  Ton(s)   Metric ton(s) = 1,000 kilograms.
  Uraninite   A strongly radioactive, brownish-black mineral, UO2, forming the chief ore of uranium (U3O8) and containing variable amounts of radium, lead, thorium and other elements as impurities.