Complex and multifactor models of ore deposits - Geology...

Complex and multifactorial models of ore deposits

Such models are compiled on the basis of forecasting and prospecting, exploratory signs, reflecting the patterns of ore deposits in geological, geophysical, mineralogical-geochemical fields. The presence of a large information base on explored deposits of minerals allows creating their models as benchmarks for the main industrial types. To develop on their basis new methods of assessment. The main task of such developments is to ensure the comparison of each newly evaluated object with the model-benchmark by the basic counting characteristics; determination of the degree of similarity on a quantitative basis; correction of the location of excavations as the results are obtained and the calculation of resources and reserves by computer programs. Determination of the gradients of changes in the morphology of ore bodies and the content of useful components should serve as a basis for the rational placement of prospecting and exploration workings. In the field models, information (a collection of counting parameters), functional (logical methods of model formation) and technological elements are combined. They are combinations of system and software methods.

The modeling of mineral deposits becomes an integral part of the overall geological exploration process, it is performed from early to final stages and stages. At each stage, the models should be compared with the standards, the reliability of the constructions should be compared, and the basic and specific models should be adjusted. A set of studies on the geological and economic assessment of the facility is being carried out. Under geological and economic assessment, the field model acts as the main end result of the geological exploration process. Relationships stocks-condition in a multivariate expression form the basis of such models. In fact, they represent a particular case of multifactor models, but they determine the qualitative characteristics of the final product of the geological prospecting process.

The two-level modeling system includes geological models of the ore field and specific structural-material, mineralogical-geochemical models of ore deposits. They are compiled on the analysis of regional prediction criteria, the degree of representativeness of reference objects. Models of ore deposits are based on local characteristics, the types of their connections on a quantitative basis. In the first case, the forecast resources for P2 category are calculated, and in the second case - resources of category P1 and stocks C2.

Forecast-Search Models - are systematized generalized descriptions of deposits in the form of a set of differentiated co-ordinated criteria and attributes. Such models allow choosing rational complexes of geological, geophysical, geochemical forecasting and search criteria and attributes for different types of deposits. This makes it possible to optimize the costs of producing the corresponding forecast and prospecting work to identify the forecast resources of categories P2 and P1 and partially C2 stocks.

Detailed models are created for estimating works - parametric, morphometric, concentration, gradient-vector.

Parametric models view the geological space adjacent to the ore bodies. The super-ore, ore, and ore zones are distinguished as levels of a single ore-magmatic or ore-metasomatic column. For example, in the podrudnom space, the actual pond, podrude flank and podruznye peripheral parts are shown. The ore-bearing part is divided into the actual ore and flank parts. Such models reflect quantitative indicators of geochemical, geophysical anomalies that fix ore-bearing structures and ore bodies. Parametric models are used for forecasting, searching for industrial deposits and for optimizing the geometry and density of prospecting and estimating observations.

Morphometric models are based on the ability to compare the linear characteristics (geometric parameters) of ore bodies: length, width, power with the identification of certain morphological types. Isopachite plans or images of ore bodies in isohypes of confining surfaces are used. Such models are designed to predict the possible extent of ore bodies at single intersections with excavations, and, consequently, to optimize the location of the projected profiles. Modeling allows sometimes to reveal the nature and linear characteristics of ore-bearing structures, and also to estimate the expected scales of ore bodies from limited information. All this will make it possible to optimize the estimated production and the number of boreholes.

Gradient-vector models in graphical form reflect the distribution of the capacities of ore deposits and metal contents. They make it possible to identify the directions and intensity of changes in these chemical elements in ore bodies and in the surrounding mineralized space. The types of models considered are closely related to the morphometric and concentration models. The initial data for constructing such models are isopachite plans, isoconcentrate (isograms) of ore bodies, as well as sections with isoconcentrates of the main and accompanying components.

Additional information on geological forecasting methods can be obtained from the author's textbook "Modeling of ore-bearing areas and mineral deposits. Tomsk: publishing house TPU, 2008 & quot ;. Typical examples of geological, geological, genetic, physico-geological, statistical, geological-mathematical, geochemical, physico-chemical, isotope-geochemical, thermobarometric models of ore fields, deposits and ore-forming processes are given in the manual.

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