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Geomechanics of reinforced cemented backfill in an underhand stope at the Lucky Friday Mine, Mullan, Idaho.

Williams TJ; Denton DK; Larson MK; Rains RL; Seymour JB; Tesarik DR
Spokane, WA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2001-138, (RI 9655), 2001 Jul; :1-18
Because backfill has occasionally collapsed into an active working area, posing a hazard to miners, engineers from the Spokane Research Laboratory of the National Institute for Occupational Safety and Health and Hecla Mining Company installed instruments in a cemented, backfilled, stope-ramp intersection at Hecla's Lucky Friday Mine, Mullan, Idaho. The purpose was to measure stress and strain changes in the backfill and reinforcing members during undercut mining. The instruments were monitored for 6 months while three successive cuts were mined below the intersection. Readings showed induced loads up to 3450 kPa (500psi) in the backfill as stope walls converged 2.5 to 12 cm (1 to 5 in.). The backfill then deformed against the top and bottom plates of the 2-m- (6-ft-) long vertical rock bolts installed as reinforcement, producing loads to 177 kN (40,000 lb) on the rock bolts. We hypothesize that a compressive zone was created in the backfill that allowed the backfill to remain stable as long as the compressive zones from adjacent rock bolts overlapped. This hypothesis is presented in graphical form. Of particular interest was the effect of loading on trusses installed to augment the vertical rock bolts and wire mesh typically installed in backfill. Data from the instruments indicate that wall closure perpendicular to the vein induced loads in truss legs parallel to the vein and in the rock bolt driven through the center of the truss, but, because they are designed to function under tension, truss legs perpendicular to the vein supplied insignificant support as a result of compressional forces from wall closure. Based on this study, use of trusses was discontinued, and an alternative support system of wood beams and posts was installed as needed to ensure the safety of miners working beneath the backfill in stope-ramp intersections.
Mining-industry; Mining-equipment; Mine-workers; Miners; Accident-prevention; Engineering-controls; Safety-practices; Safety-engineering
Publication Date
Document Type
Report of Investigations; Numbered Publication
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
DHHS (NIOSH) Publication No. 2001-138; RI-9655
NIOSH Division
Priority Area
Other Occupational Concerns
Source Name
National Institute for Occupational Safety and Health
Page last reviewed: July 16, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division