Difference between revisions of "Lucky Friday Mine"

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1- SME. (1998). Techniques in Underground Mining. Society for Mining, Metallurgy, and Exploration Inc.
 
1- SME. (1998). Techniques in Underground Mining. Society for Mining, Metallurgy, and Exploration Inc.
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[[Category:2011]]

Revision as of 11:06, 5 April 2011

Mine Overview

The Lucky Friday mine was a cut and fill operation located in Mullan, Soshone County, Idaho. Using a slice cut and fill method with timber and hydraulic sand fill it achieved a 167,829 tonnes annual production. The ore body was 396 to 488m long on the stick and 1421m on the dip, averaging a width of 2.3m and an average dip of 70⁰. The characteristic of the ore was fairly strong and the foot wall and hanging wall were highly fracture and sheared, considered being very weak. The reason for which chose cut and fill was chosen is because the slusher happen to be the most efficient mucking technique for a narrow , steeply or body where high selectivity is essential.

Table1: Relevant Statistics about the Lucky Friday mine

Annual production

167,829 tonnes

Depth (average)

1296 meters

Size of ore body

396-488m long, 1421m dip, 2.3 m width, dip 70⁰

Characteristic of the ore

Strong

Characteristic of hanging wall

Weak

Size of stope

~680 tonnes per stope

Productivity

12.1 per miner shift hour, 13,608 t per month

Mine access

Shaft

Number of employees

95 underground production, 38 maintenance, 120 as hoister, sander, nipper, cager...


Mining Method Overview

Lucky Friday used a conventional stoping cycle that consisted of sampling, drilling, blasting, mucking, rockway for extraction, backfilling loading and hauling ground support and stope ventilation. The reason for which chose cut and fill was chosen is because the slusher happen to be the most efficient mucking technique for a narrow , steeply or body where high selectivity is essential.

Table 2: select data for the lucky Friday mine design

Sampling

Channel sampling

Drilling

Percussion drills. Back stopping round 0.9-1.8m. breast stopping round 1.5m to 4m

Blasting

aqua gel slurry

Mucking

14.9kW (20hp) electric double drum slusher

Rockway for extraction

1.2 meter diameter rockway raised with the stope and encased in the sand fill

Backfilling

Hydraulic sand(Classified mill tailing) fill (65% solid)

Loading and hauling

Side dump cars pulled by 5.4 tonnes battery locomotive on rail

Ground support

Timber stull and post sets, stull only, or rockbolts with plates

Stope ventilation

2830-5664 L/s auxiliary axial flow fan


References

1- SME. (1998). Techniques in Underground Mining. Society for Mining, Metallurgy, and Exploration Inc.