mineral deposit modelsfor mongolia- u s g s（矿床modelsfor蒙古- u g年代）.doc

Preliminary Description of Mineral Deposit Models (Types) for Mongolia By Gunchin Dejidmaa (Institute of Geology and Mineral Resources, Mongolian Academy of Sciences, Ulaanbaatar) Dangindorjiin Dorjgotov (Institute of Geology and Mineral Resources, Mongolian Academy of Sciences, Ulaanbaatar) Ochir Gerel (Mongolian Technical University, Ulaanbaatar) Ayurzana Gotovsuren (Monrud Co, Ltd., Mineral Exploration and Mining Company) Sodov Ariunbileg (Institute of Geology and Mineral Resources, Mongolian Academy of Sciences, Ulaanbaatar) INTRODUCTION This report provides a preliminary description of the major mineral deposit models (types) for Mongolia. This preliminary description is being compiled as part of a project on the Mineral Resources, Metallogenesis, and Tectonics of Eastern and Southern Siberia, Mongolia, Northeast China, South Korea, and Japan. For additional information on the project, please refer to the companion project summary by Nokleberg (this volume). In future publications of the project, the descriptions of mineral deposit models will be expanded. CLASSIFICATION OF MINERAL DEPOSITS Metalliferous and selected non-metalliferous lode and placer deposits in this report are classified into various models, or types, described below. This classification was derived mainly from the mineral deposit types of Eckstrand (1984), Cox and Singer (1986), Nokleberg and others (1987, 1993, 1994a, b, 1997), cited references for specific models, and unpublished data of the Mongolian authors. The mineral deposit types used in this report consist of both descriptive and genetic information that is systematically arranged to describe the essential properties of a class of mineral deposits. Some types are descriptive (empirical), in which instance the various attributes are recognized as essential, even though their relationships are unknown. An example of a descriptive mineral deposit type is the basaltic Cu type in which the empirical datum of a geologi