STATISTICAL ANALYSIS OF BOREHOLE SAMPLE DATA FROM THE LIWU COPPER MINE, SICHUAN, SOUTHWESTERN CHINA

• Yang Zhaoping

  Metallogenetic Prospect Division, Chinese Academy of Geological Sciences

• Li Zijin

  China University of Geosciences at Wuhan

• Zhang Shuangquan

  China University of Geosciences at Beijing

Bibliographic Information

Other Title

• Statistical Analysis of Borehole Sample

Abstract

A knowledge of statistical analysis plays an essential, role in expressing varied characteristics in quantity and revealing informations about ore deposits genesis. In this regard, we have applied some statistical methods to grade of orebodies in the Liwu copper deposit in order to establish the characteristics of grades for a metallogenetic model. Three data sets were analyzed. Data set 1 contains assays of orebodies A₁A₂B₁B₂ from the upper mineralized zone, data set 2 contains assays of orebodies B₃B₄B₅CD from the middle zone, and data set 3 contains assays of orebodies E₁E₂E₃E₄ from the lower zone.<BR>The frequency distributions of grade data suggest that all distributions are highly skewed and theoretically close to the lognormal. This trend of grade for the deposit strikingly indicates a main metallization phase, slightly superimposed by the later metallizing process. Meanwhile, the statistical characteristics indicate clearly that the middle mineralized zone represents the most profitable section of this deposit. The statistical tests concerning grade variances and means manifest that orebodies from the three zones were formed from the same mineralization process, rather than different ones developed by some previous researchers. Consequently, three zones are different sections of a mineralized zone, which strongly agrees with a recent structural viewpoint that orebodies of the Liwu copper deposit are controlled by one homocline recumbent fold. The grade model analysis shows that there is a strong similarity between the Liwu copper deposit and Besshi massive sulfide copper deposits.

Journal

• Geoinformatics

  Geoinformatics 7 (1-2), 29-35, 1996

  Japan Society of Geoinformatics

Keywords

• Frequency distribution
• Statistical characteristics
• Statistical test
• Grade model

Details

• CRID: 1390282679416177152
• NII Article ID: 10004560123
• NII Book ID: AN0036643X
• DOI: 10.6010/geoinformatics1990.7.1-2_29
• ISSN: 1347541X
• ISSN: 0388502X
• NDL BIB ID: 4002916
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4002916
• Web Site: https://www.jstage.jst.go.jp/article/geoinformatics1990/7/1-2/7_1-2_29/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed