1 i i e M i n i n g M a g a z i n e
VOL. L X X V No. 4. LON D O N , O C T O B E R , 1946.
o n e p sr h i l l.n gO v e r 1 0 , 0 0 0 R u s t o n - B u c y r u s e x c a v a t i n g m achines o f all types and sizes w ith b u ck et capaci
ties fro m J to 10 cubic yards, have been success
fu lly installed th ro u g h o u t th e w o r ld .
R U S T O N - B U C Y R U S L T D . E X C A V A T O R S P E C I A L I S T S L I N C O L N
T he s p e e d , lo w air consu m ption p e r foot d rilled an d r u g g e d n e s s of <p Drifters c o m b in ed with th e u n iq ue ad v a n ta g e of the <p “ M otorfeed ” form s an un usually stron g com bination m aking for outstand in g drillin g perform an ce. Their o p era tio n is e a s y b e c a u se the ste e l is run dow n
autom atically w h ile the o p e r a to r 's tim e and e n e r g y ar e fr e e d . . . fast b e c a u s e full u s e can b e m a d e of th e <p D rifter’s c a p a c ity right to the e n d of the w o rk in g d a y . . . safe b e c a u s e the fatigue elem en t is su bstantially r e d u c e d . Full inform ation w ill g la d ly b e p r o v id e d .
A IR C O M P R E S S O R S • P N E U M A T I C T O O L S . E L E C T R I C T O O L S . D I E S E L E N G I N E S - V A C U U M P U M P S C O N T R A C T O R S ’ E Q U I P M E N T • R O C K D R I L L S . D I A M O N D D R I L L S . O I L W E L L T O O L S
C P26
~ * - T H E MINING MAGAZINE
One of a number of Heavy Duty Sledgers being manufactured by Fraser and Chalmers.
F. and C. Heavy Duty Sledgers are d esig n ed to crush run-of-mine ore, capacities 200/800 tons per hour. These are m assive m achines—eq u ip p ed with automatic lubrication and water cooled bearings—
specially d esig n ed to m eet the dem and for large outputs required by m ines and quarries.
FRASER & CHALMERS ENGINEERING WORKS
Ep t l T H , K E N T . l o n d o k o f f i c e: m a g n e th o u s e,k i h c s w a y
M . S. 3 d / J R
TRYING IT OUT
T h e w o r ld ’s store o f scien tific k n o w led g e is still in su fficien t to forecast w ith m ath em atical certain ty the b eh aviou r o f m aterials u nder all co n d itio n s. O ften , h ow ever, w e are a b le to su ggest th e m o st p rom isin g m aterial for trial. S o m e tim es, to o , the probab le c o n d itio n s can be sim u la ted in our research la b o ra to ries w ith m ore sp eed an d p recision than in a fu ll scale test.
THE MOND NICKEL COMPANY LTD
G R O S V E N O R H O U S E PA R K L A N E L O N D O N W1
4
T H E M INING MAGAZINE
for
Screening an d G ra d in g R eq u irem en t
“ H A R C O ” Perforated Steel Screen Plates ensure the highest standard of performance under the heaviest duty. They save main
tenance charges and reduce production costs— let us quote you for Screens that will give you a larger and more profitable output with
T R O U B LE -FR E E SER V IC E
Catalogue M450 sent on request.
G.A.HARVEY & C o . ( l o n d o n ) L t d .
W O O L W IC H ROAD. LONDON. S .E .7
‘R U B B E R N E W S ’
F R O M T H E B.T.R. — SIL V E R T O W N G R O U P
MANUFACTURERS OF TYRES ' HOSE ■ BELTING ■ LININGS ■ MOULDINGS ■ CO VE R IN G S
BTR-Silver towtt
SERVICE TO INDUSTRY É
Power Transmission
P R O D U C T I O N Engineers know the extent o f industry’s debt to the transm ission belt.
O rdinary folk may reflect th at no single developm ent has done more to increase the volum e and lower the cost o f consum er goods.
Long lines o f m achines are now driven by the same pow er unit through transm ission belts, m ulti
plying by m any times the o u tp u t capacity o f sim ilar m achines forty or fifty years ago. T hroughout t h a t tim e , B .T .R .-S ilv e rto w n engineers have solved knotty problem s and provided new and better belts to satisfy dem ands for higher speeds; for greater flexi
bility, tensile strength and en d u r
an ce; for resistance to climatic
changes, acid and chem ical fumes, oil, etc.
The variety o f types, sizes an d special grades now supplied is surprisingly great, ranging from the tiny circular belt driving a dom estic vacuum cleaner to flat belts 50" wide, tran sm ittin g nearly a th ousand horse-pow er an d m oving at 5000 ft. per m inute.
THE B.T.R. — SILVERTOWN GROUP
B .T .R . High Test Belting, ‘ V Belts, Fan Belts, e tc .; Silvertown ‘S u p erflex'
& Anti-static B eltin g ; Palmer H igh-Speed Cord Belts, etc.
H E R G A H O U S E , V I N C E N T S Q U A R E , L O N D O N , S . W . l
6
T H E M INING MAGAZINE
In the years that lie ahead, efficiency in B ritain ’s mines,factories and workshops will largely depend upon the design and q u a l i t y o f th e
p l a n t a n d machinery used, j
Robey of Lincoln who have been making industrial plant for nearly a century will, by keeping their manufactures up-to- , date, continue to
; contribute to in-
% dustrial efficiency.
fiOBEY & CO LTD. LINCOLN. London O ffices: Commonwealth Bank Chambers.did Jewry E.C.2.
7
AIR COMPRESSORS
R eciprocating and Turbo types up to 20,000 cubic feet per minute, inclu d in g special designs for pressures up to 400 atmospheres —
Motor driven air compressors installed at a Copper Mine.
O U T S T A N D I N G R E L I A B I L I T Y - L O W O P E R A T I N G C O S T S — M any “ B & M ” compressors are running with unimpaired efficiency after 25 years* service.
BELLISS & MORCOM L
B IR M IN G H A M 16, E N G L A N D
O th e r m anufactures
STEAM ENGINES STEAM TURBINES CONDENSING PLANTS
O IL ENGINES ■ "A R C A " REGULATORS • PNEUMATIC HOSE C O U PLIN G S
T H E M INING MAGAZINE
F L A M E P R O O F
CONTACTOR STARTERS
DIRECT-ON-LINE fo r m o to r s u p to 10 H o rs e p o w e r a t 4 0 0 / 5 5 0 v o lts.
S T A R T E R , w i t h m e c h a n i c a l l y a n d e l e c t r i c a l l y i n t e r l o c k e d i s o l a t o r , f o r m o t o r s u p t o 1 0 H o r s e p o w e r .
C o v e r cannot be rem o ved unless iso la to r is open.
Is olator:—
In sep arate fla m ep ro o f cham ber.
S ta r te r can be exam ined w ith isolato r open in p erfect safety, and complies with Coal Mines D ra ft Regulation 14 (Hi).
Conform to
S T A R T E R ( w it h o u t I s o la t o r ) f o r m o t o r s u p t o 7 ; H o r s e p o w e r .
Flameproof Reversing Starters up to 6 Horsepower at 4 0 0 /5 5 0 volts.
Flam eproof Star-delta Starters up to /5 Horsepower at 4 0 0 /5 5 0 volts.
BSS.229/1940
B T H
T H E B R IT IS H T H O M S O N -H O U S TO N C O M P A N Y L IM IT E D . R U G B Y . E N C L A N D
A 3501
P r in c ip a l O v e r s e a s R e p r e s e n t a ti v e s fo r T h e B T H C o m p a n y : A U S T R A L I A . Sydney:
Australian G eneral Electric Proprietary Ltd., G .P .O . Box 2517.
M elbourne : Australian G en eral Electric Proprietary L td., G .P .O . Box 538-F.
E W Z E A L A N D . W elling
ton : National Electrical &
Engineering Co., Ltd., P .O . Box 1055.
C H I N A . Shanghai : Inniss &
Riddle (China) Ltd., 43, Yuen Ming Yuen Road.
Hong Kong : Inniss & R iddle (China) Ltd., 1st Floor David House, 67-69, Des V oeux Road Central.
IN D IA . C alcutta:
Associated Electrical Indus
tries (India) L td ., P .O . Box 271.
Bombay : Associated Elec
trical Industries (India) L td., P .O .B o x 484.
R H O D E S I A . B ulawayo:
Johnson & Fletcher Ltd., P .O . Box 224.
S O U T H A F R I C A . Johannesburg : Wilson & H erd Ltd.. P .O . Box 7733.
C apetown : Wilson & H erd, Engineering (P ty .), Ltd. P .O . Box 1459.
W E S T A F R I C A .
Sekondi, Gold Coast Colony : T h e W est African Electrical Co.. P .O . Box 8.
K E N Y A , U G A N D A . T A N G A N Y IK A .
N airo b i: R. G. V ernon & Co., P .O . Box 124.
N a iro b i: British East Africa Corporation (1939) Ltd., P .O . Box 182.
D ar-es-Salaam : Lehmann's (Africa) Ltd. (for lamps only), P .O . Box 163.
a n d o th e r s th r o u g h o u t th e w o r ld .
8-CYLINDER TYPE E.P.V. B L A C K S T O N E O I L E N G I N E
This unit is one of the famous Blackstone range, running at 600 r.p.m . and provides dependable and econom ical pow er.
A ll w o rk in g parts are to ta lly enclosed and at the same tim e easily accessible.
Supplied in sizes 2 to 8 cylinders, 80 to 320 B .H .P .
A ll Blackstone Engines em body the Listard process (Van der H o rs t p atents) chrom e hardened c ylin d e r liners.
B L A C K S T O N E A N D CO . LTD. • ST A M FO R D • E N G L A N D
10
t h e m i n i n g m a g a z i n e
T H E "R E ID * R E P O R T S A Y S -
T h e Koepe system of w in ding should be investigated T H E O N L Y T H R E E K O E P E W IN D E R S
O P E R A T IN G IN G R E A T B R IT A IN U T IL IS E
M E T R O V IC K E Q U IP M E N T
The illustration shows a M etrovick 750/1500 H P. Electric Koepe W inder installed at M urton C o llie ry - South Hetton Coal Co. Ltd.
l e t o u r
E X P E R IE N C E H E L P Y O U
T R A F F O R D P A R K ••• M A N C H E S T E R 17.
C /M 602
11
PIPED
m i n
V A L V E S
will positively S E A L IT
F re e d o m fro m leak s, b e c a u s e e v e r y v a l v e i s
“ L u b risea ld ” ; long life, b ecau se m e ta l-to -m e ta l c o n ta c t is p re v e n te d ; q u ick an d c e rta in o p e ra tio n u n d e r th e m o st difficult c o n d itio n s— th ese are th e q u a litie s t h a t m ak e “ A udco ” th e m o s t e co n o m ical of all v a lv e s w h en co rresp o n d in g p e rfo rm a n ce an d re p la c e m e n t co sts are c o m p ared .
A typical “ Audco installation at a N orth Country Coke Oven P lant, handling coke oven gas a t 30 lbs.
per square inch pressure.
a Y f X T T * " T i T T T T I T T ' I T ToT l i d .
N E W P O R T , S H R O P S H I R E , E N G L A N D • T E L E P H O N E : N E W P O R T 3 2 4 5
M - w . 47
12
T H E MINING MAGAZINE
Co m p lete 1945 b ib lio g ra p h y o f a v a ila b le m aterial on the flotation process is listed in the sixteenth annual supplem ent to the Flotation In d e x — now r e a d y . O b ta in this authoritative com pilation. M a n y o f the publications listed a r e o f unusual interest. If you lack a n y or all o f the consecutive annual additions o ffe re d , including the orig inal list p u b lished in 1931, p le a s e request the missing ones, or the entire set.
Im p o r t a n t In fo r m a t io n on F lo t a t io n
R e a d y . . . a n d y o u r s for the a s k in g
Flotation Fundamentals . . . a comprehensive handbook
S im p ly f i l l in th e c o u p o n , a n d m a il.
G re a t Western Division, The Dow Chemical Company | (Dept. C) 310 Sansome St., San Francisco 4, Calif.
□ Send without charge the 16th Annual Additions . for the Flotation Index.
O Send without charge the complete Flotation Index I (16 annual compilations).
1~~| Send without charge a copy of "Flotation Funda- i mentals."
N am e--- I
Address--- I
Firm N am e !
Position.--- .--- I
I---1
Flotation from the beginnin g — from bulk oil through the froth method and X anthates ; elem en tary prin
ciples o f Froth Flotation, and a b ro a d , cle a rly discussed treatm ent o f m odern processes and r e a g e n ts — these and other re la te d subjects, includ
ing uses and application s o f B e a r Brand Xanthates, a r e co v e re d in the n e w ly issued booklet, “ Flotation Fundam entals.“ Your co p y is r e a d y and will be m ailed upon request.
B E A f U f R A N D X A N TH A TES
G R E A T WESTERN DIVISION
THE D O W CHEM ICAL C O M PA N Y
S a n F ra n c is c o 4 • C a lif o r n ia , U . S. A .
13
COAL SAVED at yearly rate of 2000 TONS
BY THERMAL LINKAGE
v \ ' ' I i I I /
,
O H S ) :
I I l I t V x
C o sts do w n , o u tp u t U P . W a r o r n o w ar, fuel shortage o r n o t, th o se are every P ro d u ctio n M a n a g e r’s aims.
T H E R M A L L IN K A G E ca n p ro v id e th e solution, a t a tim e w hen we need every to n o f fuel we can save an d every o u n ce o f ex tra p ro d u ctio n we can get. T H E R M A L L IN K A G E gets these results b y co -o rd in atin g y o u r various heat- using processes as far as possible into a single unit.
H e at is circu lated a n d re-circulated fro m p o in t to p o in t till its usefulness is ex hausted b y w ork a n d n o t by w aste.
R ead below w h at T H E R M A L L IN K A G E d id fo r a P a p er M ill, then send fo r F u el Efficiency B ulletin N o . 21 (The C o n stru c tio n o f a F acto ry H e at B alance) o r c o n tact y o u r R egional Office o f th e M in istry o f F uel an d P o w e r fo r assistance a n d advice.
H O W IT W A S DONE
Û Û Û
_*_J Z ~ L -
- H * 1 K
— j
M
O O aH a 1 h =*D - H < » K
L — =33 S
1 1
h
flMMÛ Ù Ù
B E F O R E T h e rm al L inkage. B oilers supplied steam to three back pressure engines. N o économ iser installed and o u tlet flue gas tem p eratu re 850°F. B oiler feed pum p ex hausted to atm o sp h ere. C o n d en sate ran to w aste from ev a p o ra to rs an d size p o t. Live steam used fo r space heating.
D u e to the absence o f a co rrect steam tra p p in g system, 37 p er ce n t o f the retu rn was uncondensed steam . The dryer, d riv en by tw o steam engines, was unable to tak e all the e x h au st an d som e 1400 lb. o f steam per h o u r was blow n to atm o sp h ere. T he d ryer was g ro u p tra p p ed (only two tra p s fo r 15 cylinders).
T t R T h erm al Linkage. T he in sta lla tio n o f an econom iser an d o th e r im provem ents en ab led p la n t to run o n tw o boilers instead o f three. E x h a u st fro m feed p u m p used to h eat boiler feed w ater. F lash steam collected fro m ev a p o ra to rs an d p u t to use, a n d co n d e n sate collected in a lagged sto rag e ta n k fo r use in digesters. S u rp lu s steam provided by these an d o th e r im p ro v em en ts utilized to o p erate size p o t an d provide space heating. D rying cylinders individually trap p ed , resulting, am o n g o th e r things, in reduc
tio n in pow er req u ired by d ryer. N o t o n ly w as th e re a to tal saving o f 31 % coal b u t also a saving o f 33% m ak e-u p w ater F o r com plete details o f ab o v e case see “ Fuel Efficiency N ew s ” N o v em b er 1945.
I S S U E D B Y T H E M I N I S T R Y O F F U E L A N D P O W E R
14
T H E MINING MAGAZINE
P ro d u c e r of th e W o r l d ’s W id e s t L in e of M a jo r In d u strial E q u ip m e n t . . . o v e r 1,600 D iffe re n t Pro d u cts th a t F u rth e r G ood Livin g !
From 2,200 fe e t below the surface, this A llis - C halm ers b y-cylin d ro } conical-balanced, single drum hoist raises 1 0 tons o f limestone every 12 0 seconds in w h a t is probably the deepest limestone p la n t in the world. A llis - C halm ers builds hoists ranging in size fr o m m edium to the largest b u ilt— has them operating on slopes a n d over sh a fts extending more th a n a m ile deep. C om pletely electric
a lly d rive n a n d controlled w ith la test sa fety fea tu res. A lso check A - C lig h tw eig h t cages an d skips— th e y increase p a y lo a d ca p a c ity.
A LLIS-CHALM ERS M A N U F A C T U R IN G C O M P A N Y offer products of quality and integrity as the builders of the w o rld ’s widest range of major industrial equipment.
For Allis-Chalmers builds complete power generation, distribution and control equip
ment— pumps— motors— V-belt drives— crushing, cement and mining equipment—
flour— milling, food and chemical processing equipment— in all, over 1,600 different products that aid industry and further good living ! Your enquiries for information or literature will receive prompt attention from—
ALLIS-CHALMERS
MANUFACTURING CO M PAN Y,
T O T T O N , S O U T H A M P T O N
T e le p h o n e : T O T T O N 3141/2.
15
16
T H E M INING MAGAZINE
OPEN
LETTER FROM A MANAGER
— “ The other day I went through the --- mine. They were in trouble. The plant was composed of machines bought here, there and everywhere. Price seemed to have been the main consideration. The result, as might have been expected, was like a badly blended team. The individual machines, the items of equipment, were in themselves, perhaps, reasonably good, but they had not been designed to work together, particu
larly on this job. Result, hold-ups all along ; technical men from all over the country arguing who was to blame, each putting it on to the other’s machine. It would have been far better if they had let a specialist firm supply the entire plant from start _ to finish . . . .”
E D G A R A L L E N & C O . L I M I T E D a re m an u factu rers of com p lete plant for crushing, d rying , g rinding, calcinin g, m ixing, classifying, p ulverizing , etc. T h e y m a n u fa ctu re a w id e range of m achines capable of handling m any d ifferen t m a te ria ls.
A n e x p e rim e n ta l p lant is ava ilab le at the w o rk s fo r tests on c u s to m e r’s m aterials.
Send your problem to :
E D G A R A L E E Si & CO M PANY, EÏP
IM P E R IA L S T E E L W O R K S:- SH EFF IELD -9
17 M .M .
Products include:—
D IE S E L E N G IN E S
•
S T E A M T U R B IN E S S T E A M E N G IN E S H E L I C A L G E A R IN G
•
C O N D E N S IN G P L A N T D E -A E R A T O R S C E N T R IF U G A L PU M PS
•
T U R B IN E P U M P S A X I A L F L O W PU M PS
D .C . G E N E R A T O R S D .C. M O T O R S C O N T R O L G E A R S W IT C H B O A R D S
W . H. A L L E N — the name that is backed by over 65 years’ specialised experience in mechanical, hydraulic and electrical machinery, conforming to the latest scientific and technical developments and maintaining a world-wide reputation for quality and reliability.
W e specialise in the design and construction of complete power generating plant and pumping machinery installations for industry and public services.
B E D F O RD E N G L A N D
18
v
T H E M INING MAGAZINE
" a">eiefci n j
D U N L O P RUBBER CO. LTD. (G EN E R A L RUBBER G O O D S D IVISIO N ) W O R K S A N D HEAD O F F IC E : C A M B R ID G E STREET, M AN CHESTER
LONDON : Clerfcanwell Houie, Clerkenwell Green. E.C.1 * BIRMINGHAM: Dunlop House, Livery Street. • * LIVERPOOL: M Cornhill, Park Lana, 1 * GLASGOW: «-4 0 and 70-7« North Wallace Sir
Finer Crushing w i t h
a PEG SO N -TELSM ITH G Y R A S P H E R E
This machine is the very latest expression of modern crushing practice. It is earning an international reputa
tion among great concerns, whose repeat orders are an earnest of the outstanding efficiency of the gyra- sphere, which is built in sizes capable of handling from 20 to 200 tons per hour. Though designed for finer crushing than the ordinary secondary equipment, you w ill find the gyrasphere just as efficient on the larger sizes forming the normal output of second
ary crushers. The large feed opening, combined w ith the spherical crushing surface, gives an unobstructed
and unlimited choke feed. C u t steel drive gears, roller thrust bearings, automatic force feed lubrica
tion, piston ring dust seals and manganese steel wearing parts all contribute to low operational and
maintenance costs. A ll adjustments are outside
the machine apd easily accessible w hilst it is in
operation. The gyrasphere unquestionably does
more than other secondary crushers and does it decidedly cheaper. It w ill pay you to know all about it. Inquiry commits you to nothing, so w rite now asking any questions you like.
PEGSO N LTD .
Iddesleigh H o u se , C a x to n S t ., W e s t m in s t e r , Lo n d o n , S . W . I
W o r k s : C o a lv ille , L e ic e s te r.
P h o n e : A b b e y 2373
20
T H E M INING MAGAZINE
a re ro b u st in co n stru c tio n a n d e x p r e s s ly s u ite d to in d u stria l u sa g e , a n d have a high d e g re e o f a c c u ra c y w h ich is w e ll m a in ta in e d th ro u g h o u t th e life o f th e in s tru m e n t.
They a re u se d fo r m e a su re m e n t o f th e flo w o f ste a m , w a te r, g a s , o il, o r any o th e r flu id , w h a te v e r the q u a n tity o r pressure.
They p ro v id e a p e rm a n e n t re c o rd o f flo w and a lso , i f d e s ir e d , a c le a r in d ica tio n o f the flo w p a ss e d a t any g iven m om en t.
The to ta l flo w is r e g is te re d on a co u n te r. R e c o rd s m a y be k e p t fo r re fe re n c e and w ill sh o w v a ria tio n s betw een d iffe r e n t s h ifts o r p e r m it c h e c k in g o f ste a m co n su m p tio n o v e r p a r tic u la r p e rio d s.
Shunc m eter typ e R S / C fo r steam o r air.
KENT K.M. METERS
G E O R G E K E N T LTD ., L U T O N A N D L O N D O N
4—3 21
trend as a guide to drifting, raising, and stoping. Also, to “ pick up ” an ore body or vein cut off by faults or dikes.
(3) Drill geological structures favourable for oil accumulation. Cores reveal key horizons, saturation and porosity of oil sands. (4) Test foundation sites for buildings, dams, bridges, and hydro
electric installations.
H e r e ’s A n o th e r M o d e l—
T h e L O N G Y E A R W o lv e r in e
Mounted on double column, the W olverine is your best buy for underground drilling. The cost is low. It combines large capacity, up to 800 ft. of |-in. core, with extra power and light weight. It is easily moved into limited working spaces. Either an air or electric motor is available. A high-speed screw feed drilling head pro
duces bit speeds up to 2,400 r.p.m.
W ith it you can drill holes at any angle ; determine the location and limits of mineralized areas ; secure core and sludge samples for analysis, thus proving up your ore values. W rite for further information.
CANADIAN LONGYEAR, LIMITED, North Bay, Ontario, Canada
L O N D O N R E P R E S E N T A T IV E
A U S T IN H O Y AND C O M P A N Y , L I M I T E D , 39, St. James Place, S.W . I O t h e r re p re se n ta tiv e s in O s lo , N o rw a y ; H e ls in k i, F in la n d ; Jo h a n n e sb u rg , S .A . ; P e rth ,
W e s t e r n A u s t r a l i a ; W e llin g t o n , N e w Z e a la n d . 4 « W h a t is it Used For— It is used
to : (1) Prospect mineral lands from surface and locate new ore bodies.
Tonnage estimates can be made from data secured. Grade of ore is deter
mined by analysis of recovered samples.
(2) Drill underground to define the limits of an ore body and determine its
T H E .MINING MAGAZINE
Single deck, Open type, Selectro Screen.
The Selectro Vibrating Screen is a positive eccentric type machine which can be readily adjusted as to stroke without dismantling or special tools. The vibrator, which includes a fully floating shaft and two compound eccentrics operating as simple ones, is completely enclosed for safety and cleanliness, and all moving parts work in a continuous oil-bath.
The tilt of the screen may be altered during operation, and the screen cloths can be easily and quickly changed. The screening angle is main
tained by live rubber stabilizers mounted on self- centering arms and live rubber shoes eliminate vibration to or from surrounding machinery. The screen is made with one, two, or three decks, and in the open or enclosed types.
H e a d , W rig h ts o n also m an u factu re :—
H e a d fra m e s, S k ip s, and Cages.
W in d in g Sheaves.
H u m b le Safety H o oks.
M ill B ins and Buildings.
Jaw C ru sh e rs.
C ru sh in g R o lls.
N issen Stam p M ills.
R o ta ry and Sh akin g Screen s.
B elt C o n vey o rs and Ele vato rs.
B a ll, Rod, and T u b e M ills.
A k in s C lassifie rs.
T h ick e n e rs and A g ita to rs.
R o ta ry V a cu u m F ilte rs . Flo tatio n Equ ipm en t.
Low den D ry e rs.
Ruggles-Coles D ry e rs.
HEAD,WRIGHTSON
A N D C O M P A N Y L I M I T E D
S T O C K T O N F O R G E , S T O C K T O N - O N - T E E S
S I P A U L 'S C A T H E D R A L 6 q SIR CHRISTOPHER M E N FOUNDATION STONE LAID 1675 COMPLETED IN THE YEAR 1710
T e c a l e m i 'T'
A UTOM ATIC M ECH A N ICA L LUBRICATION
H y d r a u l i c & M e c h a n i c a l , D e s i g n i n g &
M a n u f a c t u r i n g E n g i n e e rs GREAT W E S T RD„ BRENTFORD, M IDDLESEX
P H O N E : E A L IN G 6661 (16 lines)
In th e field of A r c h it e c tu r e S t. P a u l s w a s u n d o u b te d ly W r e n ’s M a s te r p i e c e
In th e E n g in e e rin g field o f to d a y th e T E C A L E M I T
" B r e n t f o r d " M e c h a n ic a l P u m p — o n e o f a series d e s ig n e d to m e e t a ll th e lu b r ic a tin g re q u ir e ^ m e n ts of i n d u s tr y — c a n ju s tif ia b ly b e d e s ig n a te d , in its o w n s p h e r e , a M a s te r p ie c e of e n g in e e rin g in g e n u ity a n d c r a f t s m a n s h ip .
24
T H E M INING MAGAZINE
m
„ M e t THOSS CWS®W C0S,S
j
-A P R 0 D U C T O F T H E
BROOK
T E L E P H O N E .
HOUS E • P ARK L A N E • L ON D ON W. 1
M A Y F A I R 3 0 6 7 / 6 T £ L [ C H A M S : N 0 R 0 B E R C . A U 0 L E Y. L O N D O N
I
H e a d O f f i I a n d W o r k s : M I L W A U K E E • W I S C O N S I N • U - S ' A
4—4 25
fo r the purchase o f
ORES, CONCENTRATES
& MINING BY-PRODUCTS
containing precious metals
73/83 HATTON GARDEN, LONDON,E.C.I.
26
T H E M INING MAGAZINE
T H D S . F I R T H
- tJ O H N B R O W N LTD. ,
27
SHEFFIELD
Us H lliiiill
“ My 4 b.h.p. National gas engine No. 1241 has been in regular use since 1891. It is driving my farm machinery — grist mill, chaff cutter, etc. Repairs have been negligible and I readily express my great satisfaction with it's long and efficient service.”
Extract o f letter from M r. H. C. Haldane, Clarke H all, Wakefield.
IT BEARS THE HALL-MARK O F HIGH-CLASS MATERIALS AND GOOD WORKMANSHIP.
N A TIO N A L GAS AND OIL EN GIN E CO.LTD
ASHTON -U N D E R -LY N E L A N C A S H I R E
C o n tin u o u s C o rin g on t h e C o u n te r f lu s h p r o c e s s as p io n e e re d b y W e r f C o n ra d is n o w r e v o lu tio n is in g th e u su a l co rin g p r a c t ic e f o r o il p ro s p e c tin g w o r k .
Full information for counterflush coring outfits and tools by the agents :
T
h eP
r o s p e c t i n g a n dD
r i l l i n gE
q u i p m e n tC
o r p o r a t i o n, L
t d.
3 1 , R E G E N T S T R E E T , L O N D O N , S . W . 1
28
T H E MINING MAGAZINE
PROTECTION from CORROSION
A N D R E R U B B E R
Sáfe'
A N D R E R U B B E R
L IN IN G is m o st d u rab le . T h e g ra d e o f ru b b e r is ch o sen a c c o rd in g to th e d u ty , th e b o n d is n o n -th e rm o p la stic , an d th e ad h esio n n o rm a lly exceed s th e stre n g th o f th e ru b b e r itself. W e sp ecialise in lin in g cu sto m e rs’ tan k s, co n tain ers, an d o th er v essels, p ip e w o rk , valves an d ch utes. M ay w e q u o te y o u ?
F o r fu ll d e ta ils o f A n d re ru b b e r b o n d e d - to -m c ta l, p lea se r e q u e s t o u r c o m p re h e n siv e tre a tis e “ E la sto m e ric E n g in e e r in g ,”
g la d ly su p p lie d to re s p o n s ib le e x e cu tiv es.
T h re e acres of Specialised Ru b b er Technology
KINGSTON-BY-PASS, SURBITON, SURREY
T E L E P H O N E E L M B R I D G E 6 5 8 0 / 3
T E L E G R A M S A N D R E , S U R B I T O N
: : : : : : 29
T A S /A R 33
W ORTHINGTON-SIMPSON
T yp e " A T ” T w o Stage A ir Cooled.
O T H E R P R O D U C T S
High Lift Centrifugal Pumps, Vacuum Pumps, Boiler Feed
Pumps, Surface Condensing
Plants, etc., etc. Type " D A " T w o -
Stage W a t e r Co oled
Send your Enq uiries to
W O R T H I N G T O N - S I M P S O N , LTD., N E W A R K -
l l l
ON - T R E N T .
D e n v e r “ S u b A ” F lo t a
t io n c ells possess t h e c o r r e c t fu n d a m e n ta l p r in c ip le s so e s se n tia l fo r high r e c o v e r y and p r o d u c t io n o f b est g ra d e c o n c e n tr a t e . B e c a u s e o f t h e ir r e lia b ilit y and a d a p ta t io n t o all k in d s o f f lo t a tio n p ro b le m s , o v e r 20,000 D e n v e r “ S u b A ” m a c h in e s a re in use t h r o u g h o u t th e w o r ld t r e a t in g m e ta llic and n o n - m e ta llic m in e ra ls as w e ll as re c la im in g w h e a t , r u b b e r and w a s te p a p e r.
W r i t e f o r f lo t a tio n C a ta lo g u e F. 11. B.
DENVER"“
S a lis b u r y H o u se , London W a ll, L O N D O N , E .C . 2 .
Telephone— M O N a ic h 3 7 5 0 . C a b le— " D eco lon ." London.
T H E MINING MAGAZINE
i Q r t e r i e s
. . .Linking all the complicated activities of the modern coal mine, run the arteries of power. On their toughness and fitness for purpose depends always the efficient operation of the mine— and sometimes the very lives of the men who labour at the face. The experience and manufacturing capacity of Pirelli-General has long been devoted to the production of many specialised mining cables, including those for :
* C O A L C U T T E R S
* C O N V E Y O R S L O A D E R S - k L IG H T IN G
* S H O T F IR IN G
* C A P LA M P S
* S IG N A L L IN G -*■ T E L E P H O N E S
.
C^t,0A/I R E L L I G J E N E Ra I
Advt. o f The G en eral E le c tr ic Co., L td ., M agnet H ouse, K in g sw a y, W .C .2 31
C u rre n t, A .C . and D .C . (0 to 10 amps.) V oltage, A .C . and D .C . (0 to 1000 v.) Resistance (up to 40 megohms) C ap a city (0 to 20 mfds.) A udio-frequency
P o w e r O u tp u t (0 to 2 w atts) D ecib els ( — 25 Db.
to -l- 16 D b .)
The AvoM eter is one of a useful range of “ Avo ” electrical testing instrum ents which are m aintaining the
“ Avo ” re p u ta tio n for an unexcelled sta n d ard of accuracy and depend
ab ility — in fact, a stan d ard by which other in stru m en ts are judged.
S o le P r o p r i e t o r s a n d M a n u f a c t u r e r s : —
A u t o m a t ic C o il W in d e r & E le c t r ic a l E q u ip m e n t
T
JL H E M o d e l 7 U n i v e r s a l A v o M e t e r is t h e w o r l d ’s m o s t w i d e l y u s e d c o m b i n a t i o n e l e c t r i c a l m e a s u r i n g i n s t r u m e n t . I t p r o v i d e s 5 0 r a n g e s o f r e a d i n g s a n d is g u a r a n t e e d a c c u r a t e t o B .S . f i r s t - g r a d e l i m i t s o n D .C . a n d A .C . f r o m 2 5 c / s t o 2 K c / s . I t is s e l f - c o n t a i n e d , c o m p a c t a n d p o r t a b l e , s i m p l e t o o p e r a t e , a n d a l m o s t i m p o s s i b l e to d a m a g e e l e c t r i c a l l y . I t is p r o t e c t e d b y a n a u t o m a t i c c u t - o u t a g a i n s t d a m a g e t h r o u g h s e v e r e o v e r l o a d , a n d is p r o v i d e d w i t h a u t o m a t i c c o m p e n s a t i o n f o r v a r i a t i o n s i n a m b i e n t t e m p e r a t u r e .v
>. L t d ., W in d e r House, D ouglas St., Lo n d on , S .W . I 'P h o n e : V ic t o r i a 3 4 0 4 - 9
DAVIES MAGAI T WORKS 17“
W A R E , H E R T F O R D S H I R E . T e le p h o n e : W a r e 48».
3 2 M .M . 12 ©
T H E MINING MAGAZINE
C ra eliu s
XH-50
C O R E D R I L L
Drilling depth : 2,000 ft.
Three bit speeds.
C ore s up to 4f in.
Hydraulic feed.
Hydraulic chuck.
CRAELIUS COMPANY, LTD.
12, C LA R G ES STREET, LO N D O N , W . I
t e l e g r a m! * G R O S V E N O R 1378/9
! C R A E L IU S , LO N D O N
A g e n ts f o r
T H E S W E D IS H D IA M O N D R O C K D R IL L IN G C O M P A N Y
HUDSON CAST STEEL WHEELS
M A D E I N
O U R O W N STEEL FO U N D R Y
A Iso M akers o f
COM PLETE WHEELS AND AXLES
Q u ick D eliveries
ROBERT HUDSON L td . LEEDS
L O N D O N O F F I C E : 21, T o th ill S t r e e t , S .W . I. ’P h o n e : W h ite h a ll 7127.
WINDERS OF ALL SIZES
W I T H D R U M S U P T O 14' 0" D I A M E T E R
300/460 H.P. D O U B L E D R U M E L E C T R IC W I N D E R
U S K S I D E E N G I N E E R I N G C O . L T D N E W P O R T , MON., E N G L A N D
T E L E P H O N E : N E W P O R T 3921 T E L E G R A M S : U S K S I O E , N E W P O R T
34
T H E M INING MAGAZINE
Q R O D U C T S OF
■ K . O. ST O K E S A Co., L td.
6 THE VERTICAL PUMP
The Stokes Vertical Pump—an example of the modern rubber-lined centrifugal pump— is available in a number of types and sizes up to 4 in.
It entirely dispenses w ith the use of glands, thus eliminating almost the whole cause of troubles usually en
countered when pumping abrasive pulps
and slurries. *
For thick sand suspensions at dilutions of 1:1 w ater to solids, Stokes pumps have given excellent service with w ear
ing parts lasting 8 months, working 24 hours per day.
Acid liquors can be handled w ithout any fear of the liquid coming into contact w ith metal.
4 in . T yp e YR Pum p.
R. O. STOKES & CO. LTD.
M echanical and M etallurgical En g ineers
538/540, S A L IS B U R Y H O U SE, LO N D O N , E.C.2
T e lep h o n e : M A N sio n H o u se 1611. T e le g ra m s : R o sto k e , P hon e, London .
C a b le s : R o sto k e , London.
35
K. & B. Sub-A Flotation M ach in e
1. P o s itiv e P u lp S u c tio n on F e e d In le t.
2 . A ir S h e a re d in to b u b b le s b e fo re in tr o d u c e d in to p u lp .
3 . D iff e r e n t ta n k d e s ig n to s u it f lo ta tio n re q u ir e m e n t.
4 . P a r ts e a s ily a n d q u ic k ly r e p la c e d .
KNAPPS BATES LIMITED
10, GATE STREET, KINGSWAY, LONDON, W.C. 2
T elep h o n e : CHA 6770. C ables : FLOWSHEET, LONDON.
Sizes I to 20 cu. yd.
BUILDERS OF EUROPE'S LARGEST EXCAVATORS
f f x r z n i f V V/150 W a lk in g D r a g lin e s t r ip p in g o v e r
b u rd e n .
R A N S O M E S & R A P I E R , L T D . . I P S W I C H & L O N D O N . E N G L A N D
SHOVELS
TRENCHERS
SKIMMERS
DRAGLINES
GRABS
T H E MINING MAGAZINE
L. O E R T L IN G , L T D .
n o , G L O U C E ST E R PLA CE, LONDON, W. i.
(Near Baker Street Station.) ’Phone : WELbeck 2273.
P hotograph by c o u rtesy o f B ritish A lum inium Co. Ltd .
N otable sw eetness in action characterises the w hole range o f O ertling P recision B alan ces—m aking for great reliab ility and quicker, m ore accurate resu lts, obtained w ith a m in im u m o f fatigue.
Oertling fin e balances and Weights have been made in London fo r ju st on too years. M a y vce send yo u
our latest specifications?
37
TA S /O R /244
Ropes for shipping ; ropes for mining ; ropes for engineering ; ropes for agriculture ; ropes for fishing ; ropes for excavating ; ropes for transport. Ropes for every conceivable purpose from mighty hawser to humble clothes line, including the fittings and tools for their most efficient use.
This abridged list gives some idea of the scope of the activities of British Ropes Limited. In addi
tion, we make twines and cords, canvas and tarpaulins and wire of all descriptions. It is safe to say that whatever your business, British Ropes Limited can serve you.
B R I T I S H R O P E S L I MI T E D
M A N U F A C T U R E R S O F W IR E RO PE, W IR E , H EM P C O R D A G E & C A N V A S
Head Office :
D O N C A S T E R E N G L A N D
B .R .I9
1887 l ■ I
THE CYANIDE PROCESS WAS FIRST USED
FOR GOLD EXTRACTION
and, after nearly 60 years, like
"
Cassel B ra n d " H igh G rade
Sodium C y an id e it is still u n sur
passed as the m eans of reco v erin g g old from refractory ores.
“CASSEL” BRAND
CYANIDE
I M P E R I A L C H E M I C A L INDU STR IES LIM ITE D
L O N D O N , S .W .l
38
M G I I 7
T H E M INING MAGAZINE
The H A R D IN G E B A LL M ILL with
mm h
T h e illu stra tio n sh o w s a 1 0 ' x 72" H a rd in g e M ill w ith a to ta lly en c lo s e d gear case, th e gears b ein g im m ersed in o il. T h is u n it has a ca p a city o f 1,200 to n s a day.
h a r d i n g e m i l l s are n ow grind in g a bigger proportion o f the w orld ’s m inerals than any other m ake o f m ill.
T hey are reliable under the severest conditions.
T hey are designed for wet or dry (dustless) grinding o f minerals such as silica, sillimanite, felspar, anthracite, coke, carborundum, and cast iron alloys, synthetic com pounds, etc., the finished products ranging from 10 mesh to 90% minus 10 microns.
The Technical S ta f f o f International Combustion L td . are always ready to bring their exceptional experience to any industrial grinding problem.
INTERNATIONAL IS) COMBUSTION I™
N I N E T E E N W O B U R N PLACE. LONDON, W . C . ! 39
C I 9
C R U S H I N G P L A N T F O R P R O V I D I N G F E E D F O R
LI ME KI LNS.
E Q U I P P E D W I T H
5 5 " x 3 6 " B R E A K E R , P A N F E E D E R A N D L I V E R O L L G R I Z Z L E Y .
A L L W E A R I N G P A R T S IN “ E R A ” M A N G A N E S E S T E E L .
H A D F I E L D S L T D . , E A S T H E C L A W O R K S , S H E F F I E L D , E N G L A N D .
40 N o . 3 0 4 8
The Mining Magazine
Pu b l i s h e d o n th e 1 5 t h o f e a c h m o n t h a t Sa l i s b u r y Ho u s e, Lo n d o n, E.C. 2 , f o r Mi n i n g Pu b l i c a t i o n s, Lt d.
Editor : F. Hi g h a m, A .R .S.M ., M .Sc., Assoc.Inst.M.M.
Manager : S t . J. R. C. S h e p h e r d , A .R .S.M ., D .I.C ., F.G .S. Chairman : H. E. F e r n , O.B.E., J.P
T e le p h o n e : M O N a r c h 9 4 16 . T e le g ra p h ic A d d re ss : Oligoclase. C o d e s : M c N e ill, b o th E d itio n s , & B e n tle y.
Br a n c h Of f i c e, N e w Y o rk : A m e r. I n s t. M . & M .E . Su b s c r i p t i o n! i ? « ? e r 5n n u m ’ in c lu d in g p o stag e .
\. U .S .A ., $3 p e r a n n u m , in c lu d in g po stag e.
Vol. L X X V . No. 4. L O N D O N , O C T O B E R , 1946.
P R I C E O N E S H I L L I N GC O N T E N T S
P A G E
Ed i t o r i a l
Notes ... 206
A dvisory Council for Scientific and In d u stria l Research ; L ite ratu re on Mine S afety ; R.S.M. R egister ; Silver Coinage ; In te rn atio n a l Technical Congress in P aris;
In stitu tio n Visit to Billingham.
The F u tu re of Tin ... 207
An exam ination of th e p resen t position.
B ritish G u ia n a ... 208
A ttention is called to a recen t Im perial In s titu te lecture.
Mo n t h l y R e v i e w ... 2 0 9 Ne w Co m p a n i e s Re g i s t e r e d... 2 1 2 Di v i d e n d s De c l a r e d... 2 1 2 Me t a l Pr i c e s ... 2 1 2 Ar t i c l e s
Diam ond Drilling from a Decked R aft S. V . Griffith 213
A n arrangem ent for testin g piers o r steep banks.
T an talite in W estern A u stra lia 217
An account of th e W odgina deposits.
Some Ancient Gold W orkings in E gypt R. F. St. G. Lethbridge 219
A lt b u sm an ’s holiday ’ ’ th a t brought a glimpse of th e p ast.
H azards to H ealth : H eavy Lifting W. Schweisheimer 227
A w arning against over-exertion. .
Or e Dr e s s i n g No t e s... 2 2 8 Cyanide R egeneration ; D u st in Mills ; Canadian Tin ;
Copper-Lead F lo ta tio n ; A m algam ation Reviewed.
Le t t e r t o t h e Ed i t o r
" M ining Efficiency " . . . . R . B . A llw right 232 En g i n e e r i n g Lo g... 2 3 3 Bo o k Re v i e w .
H a rris o n ’s " E x am in atio n , B oring, an d V alu atio n of A lluvial a n d K in d re d Ore D ep o sits ’’ ... ...H . H . W atson 237
Ne w s Le t t e r s
V a n c o u v e r... 2 3 8
R esident E n g in e e rs ; M ineral P ro d u c tio n ; Atlin » P o rtla n d C a n a l; V ancouver ; Omineca ; Cariboo ; Similkam een ; Osoyoos • Nelson ; Yukon ; Alaska.
Toronto ... 241 Gold Production ; Porcupine ; K irkland Lake : N orth-
W estern O n ta r io ; M anitoba ; Quebec.
Melbourne ... 2 4 3 Broken Hill P ro p rietary ; Re-soiling of Dredged Areas ;
Zeehan Silver-Lead Field ; W estern A ustralian Gold O u tp u t; Gold a t M ount M onger; M orning S ta r ; O ra B anda A m algam ated.
Pe r s o n a l... 2 4 6 Tr a d e Pa r a g r a p h s ... 2 4 7 L o n g y ear G opher D rill... 248 D avid B row n G e a rs... 248 R u sto n O il-Engined L o co m o tiv es... 250 Me t a l Ma r k e t s ... 251 St a t i s t i c s o f Pr o d u c t i o n ... 2 5 3 Pr i c e s o f Ch e m i c a l s... 2 5 5 Sh a r e Qu o t a t i o n s... 2 5 6 Mi n i n g Di g e s t
Mill R e c o r d e r s ... H . E . T . H a u lta in 257 G round C ontrol in D eep Mines
C. J . Irvin g 259 T im ag am i L ake, O n tario
W . W . Moorhouse 262 M ining an d M illing a t K ing Isla n d Scheelite 265 M ica in I d a h o ... G. C. Reed 267 V erm iculite in S o u th A f r ic a ... 269 Re c e n t Pa t e n t s Pu b l i s h e d... 2 7 0 Ne w Bo o k s, Pa m p h l e t s, e t c... 2 7 0 Se l e c t e d In d e x
t o Cu r r e n t Li t e r a t u r e 271
4—5 205
L
AST m o n th it was sta te d th a t Lord R iverdale was retiring from th e position of chairm an of th e A dvisory Council for Scientific a n d In d u strial R esearch after nine years. H e is to be succeeded b y Mr. Geoffrey H eyw orth, chairm an of Lever Bros, and U nilever, L td.U
S E F U L L Y collated inform ation relating to h ealth and safety in th e m ineral a n d allied industries is contained in a recent p ublication 1 of th e U nited S tates B ureau of Mines. This is a bibliography of all B ureau publications dealing w ith these m atters an d it should enable those interested in ed ucational cam paigns connected w ith safety m a tte rs to have a com plete range of A m erican literatu re a t th e ir com m and.T
H E R oyal School of Mines (Old Students) A ssociation is engaged in th e compilation of a new R egister and in th is con
nexion old stu d en ts are being served w ith a form asking for p articu lars of th e ir career.
A ny p a st “ Mines ” m an who has n o t yet received such a com m unication is asked to w rite to th e H onorary Secretary of th e A ssociation, Dr. J. H. W atson, a t th e R oyal M int, London, E.C. 3, while those who have received a form and have not y e t com pleted it are requested to do so as soon as possible.
to em phasize th e im p o rta n t p a rt to be played b y engineers and oth er technicians in th e period of post-w ar reconstruction an d to stress th e necessity for collaboration betw een individuals from th e different nations, th e delegates adopted th e following resolution :
“ To establish an in tern atio n a l organization u nder th e nam e of ' W orld/ E ngineering Conference ’ co n stitu ted u n d er th e F rench Law of J u ly 1, 1901, continuing from th e date of its legal establishm ent th e existing organization now know n as ‘ In te rn atio n al Technical Congress The principal objects of th e Conference are, it is sta te d :— (a) To prepare for th e establishm ent of th e future W orld Engineering F ederation ; (b) to assure, if need be, th e holding of fu tu re In te r
natio n al Engineering Congresses, an d (c) to establish co n tact especially w ith th é U nited N ations Econom ic and Social Council and w ith th e E ducational, Scientific, an d C ultural O rganization (UNESCO).
I
T was recently announced by th e T reasury th a t a Bill is to be introduced in to th e c u rren t session of P arliam en t th a t will provide for th e gradual su b stitu tio n of cupro-nickel alloy for silver in B ritish coinage. This course of action is considered to have been d ictated prim arily to repay w ithin five years of th e end of the war- em ergency period m ore th a n 300,000,000 oz.of silver advanced under Lend-Lease b y the U n ite d States. I t is also felt th a t th e ful
film ent of th is obligation will rem ove one of th e elem ents th a t still stands in th e w?ay of a free m ark et in silver.
A
R IS IN G o u t of an In tern atio n al Technical Congress held in Paris from Septem ber 16 to 21, th e object of which was1 D a v e n p o r t , S . J . Mines.
W a sh in g to n : B u reau of
T 7 IS IT IN G th e B illingham an h y d rite mine V last m o n th a p a rty of m em bers of the In stitu tio n of Mining an d M etallurgy spent a very interesting d ay and was afforded an insight into p a r t of th e v a st w orks of Im perial Chemical Industries, L td . To the Septem ber Bulletin of th e In stitu tio n Mr. G.
E lan d S tew art contributes a sh o rt descrip
tion of th e m ine, w hich supplies th e raw m aterial for processes tu rn in g o u t sulphuric acid and am m onium sulphate. T he an h y d rite is won from a deposit 20 ft. thick, occurring in Perm o-Triassic beds, and delivered in crushed form to b o th th e acid and sulphate plants. In th e first-nam ed it is kiln-roasted w ith ash an d sand to produce cem ent clinker, th e S 0 2 evolved being oxidized to S 0 3 in th e presence of a platinum cataly st. In th e sulphate p la n t sy n th etic am m onia liquor is carb o n ated an d caused to react w ith ground an h y d rite, producing am m onium sulphate in solution an d precipi
ta te d chalk. L abour shortages an d rising costs necessitate a m odernization of th e u n d er
ground layout a t B illingham th a t it is hoped shortly to p u t in hand. There is no d o u b t th a t such visits are of g reat value to th e m em bers b o th on in stru ctio n al an d social grounds and it is certainly to be hoped th a t others m ay be arranged.
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