By Friedrich-Wilhelm Wellmer
This absolutely up-to-date textbook is meant for the commercial geologist who bargains with the assessment of deposits at an early level of improvement. It bargains principles for speedy and simple calculations in keeping with the appliance of approximate information. It presents either the scholar and the geologist within the box with a whole algorithm and strategies permitting them to accomplish a short preliminary review of the deposit with out the help of experts or desktops – no matter if he's left to his personal assets. All principles for calculations are illustrated with examples, and blunders and pitfalls the authors encountered in the course of their careers are pointed out.
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Extra info for Economic Evaluations in Exploration
Experience shows this to be half the distance between drill holes, but seldom more than 50 m. The resources beyond this limit should be considered as belonging to the possible category. 3 Reserve Calculations on the Basis of Plan Maps lethe drilling is done in mountainous or residential areas or if it shows strong side deflections, it will result in irregularly spaced intersections. In such cases, it is not advisable to work with sections but rather use plan maps for inclined tabular deposits or palinspastic maps for folded deposits.
Iron ore, tungsten, and antimony concentrates or "yellow cake"3, U 30 8 , the end product of uranium mines. These quotations are supplied by the price lists of the weekly "Metal Bulletin" or the "Engineering and Mining Journal". Generally these prices are quoted in "units", with I unit (l u) being 1% of the metal in the concentrate (see Chap. 6). From this the net smelterreturn of the mine can easily be derived. 1. Example. 35 $/u. 40 $/t iron ore. b. mine (free on board, see Chap. 1) freight costs have to be subtracted.
E. the metal price, and cover all other assumptions by one factor. These factors are listed in Table VII. In combination with the recovery in the beneficiation process this is a very simple way to calculate the value of the ore. The range of values in Table VII indicates the range within which mine returns fluctuate due to market changes. The overall capacities of mines and smelters worldwide are seldom really in balance. In a buyer's market, when there is an abundance of concentrates and the buyer (the smelter) determines the market the lower values apply; in a seller's market, when concentrates are scarce and the mine determines the market, the higher values apply.