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    Intangible asset valuation methods. Traditionally, intangible assets are valued through methods that can be categorized as follows: Costbased: value is determined based on how much the asset cost to create. This method is highly imprecise for data, because data is often created as an intermediate product of other business processes.

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    In 1902, Kuhn described a method that is a variation of the thermite reaction for the reduction of silicon from silicon oxide. In this process a primary reaction provides the activation energy to initiate the secondary reduction reaction.

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  • USGS Minerals Information: Map Data

    The locations of 1,879 coal mines and facilities, 8 uranium mines, and 1,965 mines and processing plants for 74 types of nonfuel minerals and materials are shown with symbols on both a large multicolored lithologic map and eight smaller maps.

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    This aerial photograph shows a typical frac sand mining operation. The picture is numbered in the order steps occur, from start to finish. Each step is described below. While individual mine operations may handle various steps slightly differently, the basic order remains the same.

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