By Alastair J. Sinclair
Utilized Mineral stock Estimation provides a accomplished utilized method of the estimation of mineral resources/reserves with specific emphasis at the geological foundation of such estimations, the necessity for and upkeep of a top quality assay information base, the sensible use of complete exploratory info review, and the significance of a entire geostatistical method of the estimation technique. sensible difficulties and genuine facts are used all through as illustrations. each one bankruptcy ends with a precis of sensible matters, a couple of workouts and a brief checklist of references for supplementary learn. This textbook is appropriate for any college or mining institution that provides senior undergraduate and graduate pupil classes on mineral resource/reserve estimation.
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Additional resources for Applied Mineral Inventory Estimation
The need for blending of high-Fe and low-Fe sphalerite to maintain an acceptably low Fe content to a Zn concentrate). In some parts of a mineral deposit, deleterious minerals (deﬁned in a smelter contract) may be so abundant as to classify some blocks as waste, even though the average metal content is above cutoff grade. 9 Factors to be quantiﬁed in estimating costs related to shipment of concentrates Commodity market or publication that determines prices to be used Date and time for period for ﬁxing the price Currency used for price determination and payment Method and time of payment Weights and measures used and any abbreviations Approximate contents of the concentrates Estimated production and amount of notice for increase/ decrease Regularity of shipments and identiﬁcation by lot/car Types of rail car/vessel acceptable for shipment Title, risk, and insurance in transit Weighting and sampling procedures Limits of error and umpire laboratories Metals paid for and deductions Smelting charges for wet concentrates Metal price escalation/deescalation clause Penalties for impurities Added costs for smelter environmental controls Added costs for labor, fuel, and electricity Force majeure for both mine and smelter Means and requirements for communications between parties Assignment of contract to successive owners of mine and smelter Country/province where disputes will be settled Road freight Rail freight Ocean freight Loading and wharfage Shipping representative Insurance Treatment Reﬁning Marketing Duty Sales commission Other items and distinction between wet and dry concentrates is essential.
Sampling error 2. Analytical error (including subsampling error) 3. Estimation (extension) error, that is, the error made in extending the grade of samples to a particular volume of mineralized rock 4. Bulk density (the all-too-common assumption that bulk density of mineralization remains constant throughout a deposit) 5. Geologic error, that is, errors in the assumptions of ore continuity and the geometry of a deposit 6. Mining method not adapted to the geometry of the deposit, that is, selectivity of ore and waste that is not optimal 7.
4: A SYSTEMATIC APPROACH TO MINERAL INVENTORY ESTIMATION Mineral inventory estimation is a complex undertaking that requires a range of professional expertise. In cases in which reserves (as opposed to resources) are being estimated, a large team of professionals might be required (cf. Champigny, 1989). Geologic, mining, and milling engineers normally are involved, as well as experts in mineral economics, ﬁnancing, and any number of specialized ﬁelds that might be pertinent to a particular deposit or the local infrastructure re- 15 quired to mine a deposit.