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适用范围：In preparing this glossary the object has been to standardize and to co-ordinate the technical terms in current use in mining in the United Kingdom. Although the majority of the terms are necessarily concerned with coal mining, account has been taken of certain terms used in other forms of mining and of quarrying. During the long period which has elapsed since the publication of the last authoritative mining glossary<up*>, many new terms have come into use. The need for the present glossary has arisen from the widely varying interpretation and use of such new terms, and the prevalent use of more than one synonym, some purely local in origin, to indicate specific meanings. The glossary will initially be issued in a number of sections, according to subject matter, and will include terms relevant to the following fields of mining: Planning and Surveying; Ventilation; Boring and Exploration; Drainage; Geology; Drilling and Blasting; Electrical Engineering and Lighting; Winning and Working; Transport; Shafts and Associated Equipment; Strata Control. The following factors have governed the selection and definition of terms: (1) Where two or more terms are in use the term which is favoured is given first and printed in heavy type. It is hoped that such preferred terms will gradually displace the non-preferred terms. Where the use of any term is considered to be undesirable it is marked ' deprecated'. (2) Taking a broad view of the various sections of this glossary, only terms which have a specific meaning in mining have been included and, generally, where a technical term has an accepted meaning in other fields of engineering it has been omitted; the few exceptions are terms which are of particular and fundamental importance in mining. (3) Purely local terms are not defined, but those of sufficient importance are included as non-preferred terms alongside the preferred synonyms. (4) Obsolete terms are excluded. note: * ' A glossary of the mining and mineral industry ' by A. H. Fay, U.S. Bureau of Mines, Washington, 1920.