Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (1): 106-112.doi: 10.13278/j.cnki.jjuese.201701110

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Discussion on the Block Size Setting During Geostatistics Reserves Estimation

Zhang Yankai1,2, Li Keqing1,2, Yang Shihai3, Li Di4, Gong Mingshan5   

  1. 1. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines/University of Science and Technology Beijing, Ministry of Education, Beijing 100083, China;
    2. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    3. Mining Funds Department of Shandong Gold(Beijing) Industrial Investment Co., Ltd, Beijing 100029, China;
    4. Changchun Gold Design Institute, Changchun 130000, China;
    5. Metal Project Department, China Railway Resources Group Co. Ltd, Beijing 100039, China
  • Received:2016-03-18 Online:2017-01-26 Published:2017-01-26
  • Supported by:
    Supported byNational High-Tech Research & Development Program(2012AA062200)

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Abstract: Resources and reserves estimation play an important role in different stages such as mineral exploration, mining design, production, management and so on. Geostatistics method has many advantages over traditional method in reserves estimation and is becoming more and more widely used. Reasonable setting of block size has a great influence on reserve estimation results, however, in practice, block size is usually defined on the basis of personal experience or subjective judgment, which is a lack of scientific support. In this study, after summarizing predecessors' work and experience, block size selection for reserves estimation was studied for the stages of exploration and production respectively. According to the characteristics of different stages, the relationships between block size and grade, reserves, estimation variance, selective mining unit were discussed for each stage and advices on reasonable block size selection were provided. Moreover, a large molybdenum deposit was used as engineering background to undertake in-depth analysis and experiments. It is concluded that block size selection not only affects grade variation and ore volume calculation but also the economic and technical evaluation of mining. Block size of 15 m×15 m×15 m is recommended for the reserve estimation of this deposit.

Key words: block size, estimation variance, grade-ton curve, selective mining unit, geostatistics, reserves estimation

CLC Number: 

  • P624.7
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