. Transactions. The Le Roi Mine. 413 requiring a heavy machine. Many contractors prefer the Rand, as itis hghter and more easily handled. Rand repairs, however, ran for atime as high as $ a month per machine. Of the 36 drills now inthe mine thirty are Sullivans, and the total repair biil is about $ month. A 375 lb. Sullivan with a 3^ piston, rating 12 , seemsto meet Le Rois needs. The steel is in the form of starters, four, five,six, seven, and eight foot lengths. The bit is of ribbed steel welded to. ^^-gagyjL ?S^M ^^^W- Flc. IX.—Ore Bins at the Le Roi .Mine. a shank. Ten to t
. Transactions. The Le Roi Mine. 413 requiring a heavy machine. Many contractors prefer the Rand, as itis hghter and more easily handled. Rand repairs, however, ran for atime as high as $ a month per machine. Of the 36 drills now inthe mine thirty are Sullivans, and the total repair biil is about $ month. A 375 lb. Sullivan with a 3^ piston, rating 12 , seemsto meet Le Rois needs. The steel is in the form of starters, four, five,six, seven, and eight foot lengths. The bit is of ribbed steel welded to. ^^-gagyjL ?S^M ^^^W- Flc. IX.—Ore Bins at the Le Roi .Mine. a shank. Ten to twenty drills are dulled per shift. Two nippers lookafter the drill suj)ply. Drilling starts with the morning shift at machine men bar down any dangerous rock, level the muck pile,and set up the bar, wedge and it in a position best adapted toreach the rock. Ihe machine set up, drilling commences, and con-tinues during morning and afternoon shift. At 11 drilling isstopped, the machine taken down, and ever)thing left ready for blast-ing- 414 The Canadian Mumig Institute. THE CONTRACT SYSTEM. Rossland mine managers in 1900 became dissatisfied with theresults of day labor in drilling and introduced a system by are two methods of payment, per foot of hole drilled, and perfoot of advance. Usually in the stopes payment is per foot of holedrilled, the result of morning and afternoon drilling being measured bythe blasting crew when it comes on at eleven. From 27 to 2iZ cents ispa
Size: 1853px × 1348px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
