Bulletin of the American Institute of Mining Engineers
Stopers For Any Ground There's some stoper that is " the best stoper " for each particu- lar kind of ground . Unless you find that " best stoper " for your ground , you're going to be working at a disad- vantage - not getting all out ...
The Outlaws of Mesquite
... Stoper came up with a lunge and dove for Marty , who stepped into a chair and tripped . Before he could regain his balance , Stoper was on him with a smashing volley of punches . Mahan staggered and Yannell was all over him , his face ...
Mine and Quarry
... Stoper , hand rotated ; Fig . 3 , the DT - 42 Dry Rotating Stoper : and Fig . 4 illustrates the Sullivan Class DT - 42 Stoper with Auto- matic Rotation and Water Attachment . It will thus be seen that it is possible to furnish a stoper ...
The Bureau of Mines Noise-control Research Program
... stoper " ) drills and machine- mounted electric rotary drills . Stoper drills are by far the loudest machines used in coal mines today , com- monly producing noise levels of about 120 dBA ( fig . 3 ) . Because Federal regula- tions do ...
The Collected Short Stories of Louis L'Amour, Volume 5
... Stoper weighed well over two hundred and Mahan scaled close to the one- ninety mark . Both were in excellent shape . Stoper roared in close and grabbed Marty . They went to the floor . Stabbing at Mahan's eyes with his thumbs ...
The Copper Queen Practical Mining Course
... Stoper Drifter Drifter Plugger Plugger Drifter Stoper Stoper Drifter - Stoper Stoper Stoper Stoper Plugger 80 90 8 R n machine pressure ( Ibs . per sq . in . ) on Air pr 60 50 70 Pluggers a $ 175 f . o . b . 66 MINING MACHINES , STEEL ...
Canadian Mining Journal
... stoper weighing 80 pounds or less . Some dry stopers are readily convertible into hand rotated wet stopers at a cost of $ 50 to $ 75 per stoper and this type is giving good satisfaction in at least one large mine . The first cost of the ...
Laboratory Wear Testing Capabilities of the Bureau of Mines
... stoper " ) drills and machine- mounted electric rotary drills . Stoper drills are by far the loudest machines used in coal mines today , com- monly producing noise levels of about 120 dBA ( fig . 3 ) . Because Federal regula- tions do ...
Engineering and Mining Journal
... stoper drill , some of which have probably been sent to various mines for test purposes . When a machine of this type is finally standardized with the automatic rotation feature it will probably be provided with one of the standard ...
Papers and Discussions
... STOPER STOPER B STOPER D STOPER A STOPER F STOPER C STOPER J STOPER B STOPER D STOPER C STOPER E STOPER F STOPER J STOPER C STOPER B STOPER E STOPER D STOPER A STOPER H STOPER F AVERAGE TOTAL UNITS PER STOPER JANUARY FEBRUARY MARCH ...
Intermountain Industry and Engineering
... stoper , hand rota- tion , direct feed , dry , solid steet . DT - 44 Light - weight stoper , hand rota- tion , direct feed , with water attachment and hollow steel . rota- DT - 44 Light - weight stoper , hand tion , with reverse feed ...
Papers Presented Before the Symposium on Underground Mining
... stoper drill for quieter operation . To date , six prototype noise controlled stoper drills have been manufactured and are being field tested in working mines . What follows is a discussion of the results of Bureau research to ...
Handbook of Rock Excavation, Methods and Cost
... Stoper Stoper DA21 DF21 Stoping Stoping Stoper DG21 Stoping Air jet Stoper DC21 Stoping 7. Length of feed , in . 24 12-24 12 12 12 12 146 38 84 83 89 86 212 24 -11/16 round hexagon cruciform cruciform cruciform 134 7/8 1 1 1 hollow ...
The Mexican Mining Journal
... STOPER that had been in CONTINUOUS SERVICE 300 SHIFTS , and a competitor's stoper that had been IN SERVICE ONLY 24 SHIFTS , the following results were obtained : THE LEYNER STOPER , WORKING 39 SHIFTS AGAINST ITS COMPETITOR'S 46 ...
Details of Practical Mining
... Stoper ( By G. E. Wolcott ) .- The stoper has , through the requirements of the leaser and small operator , been adapted to drifting . In the case of the leaser , low equipment expense is imperative . It is this fact rather than any ...
Mining and Scientific Press
... stoper , on the other hand , the preparations for drilling are simple . As a rule , a stoper can be rigged up and set to work 30 to 40 minutes earlier than a big drill . One dis- advantage of the stoper , when used for shrinkage stoping ...
Mining Library: Details of practical mining, [c1916
... Stoper ( By G. E. Wolcott ) . -The stoper has , through the requirements of the leaser and small operator , been adapted to drifting . In the case of the leaser , low equipment expense is imperative . It is this fact rather than any ...
Keystone Metal Quarry Catalog
... stoper with automatic rotation , and an all - purpose , hand - rotated drill in dry and wet types . DETAILS OF ... Stoper ( light ) .. S - 1 * Mine 10 2 76-1 62 87 - EMC Stoper . S - 2 + Mine 10-12 2 1 12 87 - EMC Stoper R - 2 ...
Manufacturers Record
... stoper . NEW STOPER IN COPPER MINE . a This latest product of the company is valve drill and the valve and the piston mo- tion follow the design of the DW - 64 drifter . This valve mo- τιση gives a powerful piston blow , with sharp ...
Sweet's Engineering Catalogue
... Stoper Drill . Differs from A - 3 Sinker only in style of top and bottom head used , with the addition of a telescope air feed . For work in stopes , or drilling up - holes ( Fig . 3 ) . A - 5 Drifter Drill . Same construction as A - 4 ...