Sampling Gold Ore by Diamond-Drilling in the Homestake Mine, Lead, South Dakota

Details

• Personal Author:
  Koch GS Jr. ; Link RF
• Description:
  Several methods of calculating ore grades by diamond-drill sampling in the Homestake mine, Lead, S. Dak., Have been evaluated by statistical analyses of assay data. The natural distribution of gold particles, partly masked through sampling and assaying procedures, is probably lognormal. As a consequence of the gold particles being clustered rather than randomly distributed within the ore bodies, (1) more mine samples are needed to obtain a specified precision of mean grade than the number predicted by the standard-error-of-the-mean law; (2) the variance of gold values is not inversely proportional to sample volume, and, therefore, small- diameter drill core yields samples nearly as good as larger diameter core; and (3) sampling at 5-foot intervals provides nearly as good results as sampling at shorter intervals. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Conference Publications ; Case Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DRC - Denver Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-35
• NIOSHTIC Number:
  nn:10008747
• NTIS Accession Number:
  PB200046
• Citation:
  NTIS: PB 200 046 :1-35
• Federal Fiscal Year:
  1971
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5a62cc144ff15a90b95b044cb7acdf7e1dee261a6b71319a8c8890984b72a37b7801828dddaf1a0c473b9fe4d2221aee5837475ccb71fd48772fa3b4f0d80003
• Download URL:
  https://stacks.cdc.gov/view/cdc/237869/cdc_237869_DS1.pdf
• File Type:
  [PDF - 13.53 MB ]