Information Circular 8462: Gold Placer Mining: Placer Evaluation and Dredge Selection

Details

• Personal Author:
  Bennett, H. J. ; Dare, W. L. ; Romanowitz, C. M.
• Description:
  This report deals with the factors which should be considered in evaluating a placer deposit and selecting a dredging system for mineral recovery. Overall dredging feasibility and the design of dredging systems are reviewed. Excavation methods, each with its advantages and disadvantages, are compared. Direct operating costs, both original and updated, of gold dredges with bucket capacities of 6 to 18 cubic feet are included. Costs vary with digging depth, changes in environmental conditions, and physical characteristics of the placer, all of which affect excavation rate and recovery. The costs, updated with appropriate indexes, should be used only as guidelines to evaluate potential dredging projects with similar characteristics. The relation of direct dredging costs to annual production is graphically illustrated by a family of curved envelopes that span dredge sizes from 2 1/2 to 18 cubic feet. A curve fitted to the data expresses the relation of direct costs to annual production. [Description provided by NIOSH]
• Subjects:
  Metals Mining Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Information Circular
• Publisher:
  Bureau of Mines
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  California ; Colorado ; OSHA Region 8 ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  60 pdf pages
• NIOSHTIC Number:
  nn:10009344
• NTIS Accession Number:
  PB-228658
• Citation:
  Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 8462, 1970 Jan; :1-56
• Federal Fiscal Year:
  1970
• Peer Reviewed:
  False
• Source Full Name:
  Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 8462
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a11645bc67836131e09ba7317d6849a9b31f4cda57274792fc0ec94480dbe4e58b501948e7861a26d8a7513b5ef035a593979a8ad052773f13f75f176dc3b56c
• Download URL:
  https://stacks.cdc.gov/view/cdc/206231/cdc_206231_DS1.pdf
• File Type:
  [PDF - 2.85 MB ]