Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Environmental impacts of cemented mine waste backfill.

Authors
Levens-RL; Marcy-AD; Boldt-CMK
Source
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9599, 1996 Jan; :1-22
NIOSHTIC No.
20023323
Abstract
Researchers at the U. S. Bureau of Mines conducted investigations to evaluate the potential for ground water contamination by mine waste used as backfill. Samples of cemented waste backfill and water discharging from drillholes and seeps were collected to use in chemical analyses and laboratory tests to determine the physical and chemical factors that control release of heavy metals to ground water. Greater water retention by cemented backfill (as compared to uncemented sandfill) reduces the surface area exposed to oxidation, which in turn reduces the amount of acid produced. The acid is neutralized by the cement and minerals contained in the backfill. The grain-size distribution of tailings used for backfill affects the structural integrity of cemented backfill under attack by acidic water; breakdown of the backfill structure releases neutralizing materials faster. Backfilled stopes in rock with low hydraulic conductivities will constitute preferential flow paths after mine flooding; however, the rate of flow through backfill will be much slower than when the stope is partially saturated during mine operation. Considering all factors, acid generation and release of metal ions from cemented backfill should be less than in uncemented sandfill.
Keywords
Mining-industry; Underground-mining; Water-sampling; Mine-waste; Environmental-contamination; Environmental-hazards; Environmental-pollution; Heavy-metals
CAS No.
7439-95-4; 7440-23-5; 7440-09-7; 6834-92-0; 471-34-1
Publication Date
19960101
Document Type
Report of Investigations
Fiscal Year
1996
NTIS Accession No.
PB96-140173
NTIS Price
A03
Identifying No.
RI-9599
ISSN
1066-5552
NIOSH Division
SRC
Priority Area
Other Occupational Concerns
Source Name
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9599
State
WA
TOP