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首页> 美国政府科技报告 >Systems Model of World Mineral Production:Zinc as a Case Example.
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Systems Model of World Mineral Production:Zinc as a Case Example.

机译：世界矿产生产系统模型：以锌为例。

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The United States imports much of its mineral requirements,and the volume of this trade is expected to increase in the future. A forecasting system that could indicate worldwide future production and supply patterns would help in economic and strategic planning and in analysis of policies that may affect these mineral supplies. The optimization model developed in this study is flexible in use,allows for complete sensitivity analysis,and is particularly suited for policy analysis. Zinc was selected as the mineral commodity used to demonstrate and test the model. Supply functions for 30producing regions were separately calculated for mines/mills,smelters/refineries,and scrap. Separate transportation matrices were determined for each product class,allowing a flow of products between any regions within the system. Tariffs were separately determined for each product entering each region. A set of upper bounds constraints was developed for each possible route. A series of solutions of the zinc system were calculated for 1974-75, 1980, 1985,and 1990. The model proved easy to use and to interpret and provided realistic simulations of the zinc production system. The basic model is readily modified to consider other mineral systems,including iron ore and nickel. The existing model was designed to operate on the Burroughs B6700computer,using the GAMMA/TEMPO program description and mathematical programming software systems.

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