ME home
 
  SME FaceBook SME Twitter SME LinkedIn RSS Feed

Subscriber or
SME Member Log On

WEB-ONLY CONTENT

Go to SME eNEWS

MINING INDUSTRY EVENTS

WM2E 2017 Energy Tech Expo  - Exhibit
Dec 14, 2017 - Dec 16, 2017
George Fox Conference  - Conference
Jan 24, 2018
2018 SME Annual Conference & Expo  - Conference
Feb 25, 2018 - Feb 28, 2018
Mongolia Mining 2018  - Conference
Apr 4, 2018 - Apr 6, 2018

METAL PRICES


Au
Ag
Pt
Pd
Ni
Cu
Al
Pb

AGGREGATES
AND MINERALS
MARKETPLACE


http://aggregatesmineralsmarketplace.com
The Mining Engineering, SME and NSSGA
Online Buyers Directory Site
The Online Global Mining and Minerals Library Site
November 2014
Volume 66    Issue 11

Rehabilitation of Hecla’s Lucky Friday silver shaft

Mining Engineering, 2014, Vol. 66, No. 11, pp. 31-31
Berberick, D.; Strickland, B.


PREVIEW:

Hecla’s Lucky Friday Mine is a deep, underground producer of silver, lead and zinc in the Coeur d’Alene mining district of northern Idaho. Main access into, and production from, the mine is via the Silver Shaft, a 5.5-m (18-ft) diameter, concrete lined shaft sunk by J.S. Redpath to an original depth of 1,890 m (6,200 ft) in the early 1980s. The shaft is divided into four compartments (Fig. 1), with sets made of 225 mm x 175 mm (9 in. x 7 in.) hollow structural section (HSS) steel buntons and 150-mm x 150-mm (6-in. x 6-in.) HSS dividers spaced every 4.5 m (15 ft) down the length of the shaft.

Two skip compartments on the east side of the shaft are equipped with 125-mm x 150-mm (5-in. x 6-in.) HSS steel guides and 9-t (10-st) skips with three deck trailer cages for men and materials. The west side of the shaft is divided into a manway, and a fourth compartment that was originally designed for a service cage. Shaft services consist of a 250-mm (10-in.) a compressed air line and 150-mm (6-in.) sandfill line along the south side of the shaft, and 250-mm (10-in.) discharge (gray) water and 150 mm (6 in.) fresh water lines on the north wall. The mine’s primary 13.8 kV power lines, as well as communication lines are located on the west wall of the shaft.  



Please login to access this article.

OR

If you are not an SME member, you can join SME by clicking the button below.