著者

佐々木 久郎 ディンディウェ チャールズ 安達 毅

出版者

The Mining and Materials Processing Institute of Japan

雑誌

資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)

巻号頁・発行日

vol.117, no.7, pp.604-612, 2001-07-25

参考文献数

17

被引用文献数

1

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In this paper, a new concept for final pit shape in open pit design, Best Positive Inverted Truncated Cone (BPITC) algorithm, is presented for feasibility study and basic scheduling. Five mineral deposit models were used for eventual surface mine design optimization. Initially, geological reserve models were simulated by the utilization of GSLIB using randomly and regularly spaced drill hole data. Effects of varying anisotropy on the obtained metal quantities in reserves were also investigated. The BPITC was successfully applied to 100-times simulated deposit data set using Geostatistical simulation code GSLIB. The optimization results by BPITC were compared with those obtained by Positive Moving Cone (PMC) and Dynamic Cone (DC) based algorithms for the same mineral deposit models. The obtained results indicate that BPITC is superior to all the other optimizers. Concequently, the frequency distribution curves of profits and pit incremental feature by BPITC give effective information on mineral project decision-making and mining sequencing respectively.<BR>The conclusions from this study are summarized as follows:<BR>1. It was proved that for any type of deposit, the usage of correct anisotropic factors used in GSLIB lead to correct evaluation of reserves.<BR>2. All the profits / benefits computed for all the five model deposits show that a newly developed scheme named as BPITC can always indicate optimal solutions for final pit designs.<BR>3. Conclusively, the frequency distribution curves of profits and pit incremental feature by BPITC give effective information on mineral project decision-making and mining sequencing, respectively.

著者

西山 孝 安達 毅

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.109, no.6, pp.473-477, 1993-06-25 (Released:2011-01-27)

参考文献数

7

被引用文献数

2

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World production of widely used metals grew rapidly until the early 1970's, as expressed in The Limits to Growth (Meadows et al., 1972), but then metal demand dropped sharply after 1973. Growth rates in production of each metal varied year by year or among metals.The difference between supply-demand forecast and actual production during last 20 years was examined. Different patterns between the two for 16 metals were classified into four groups.(1) The actual production of Co, Cr and Pt exceeded the projected trend that had been predicted in 1970.(2) Iron accounts for more than 95% of all metals consumed. A significant proportion of Mn, Ni, W, Mo, Cr and Co produced is used in the steel industry. This group, composed of iron and related metals other than Co and Cr, shows a similar pattern.(3) Growth rates of production of Cu, Zn, Ag, and Al continued to be low during the last 20 years, but the rates are not negative.(4) Growth rates of production of Pb, Au, Sn and Hg are negative or zero. Large differences between actual production and predicted consumption prevailed during the 1970-1990 period.When the lifetime of these metals calculated in 1970 are compared with those in 1990, static indices of Au, Hg, Ag, Sn, Zn and Pb which fall in the range of 10-30 year, have not changed very much. No tendency toward depletion of the resources has been found under the present condition. New reserves have been discovered in the last 20 years. A basic question in the long-term supply is how long the present situation continue.