The Mining Magazine, Vol. 75, No. 1

i ne mining magazine

V O L . L X X V . L O N D O N , J U L Y , 1946.

P R I C E O N E S H I L L I N G

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y N O R W /jy PORTUGAL

ROMANIA SPAIN

* * * * *

a:

PtRU

F I J I I S L A N D S

PHILIPPINE ISLANDS

C ^ s " lA S T '« ■ » «

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that the Symons Cone is without equal for fine crushing operations. This is evidenced by its use in practically every industry in every country throughout the world where ores, rock, gravel, slag and similar materials are produced in quantity. Users amongst a ll nations agree that the Cone delivers a fin e r product in g re a te r capacity at lo w e r cost than w as ever possible w ith any type of reduction crushing equipment.

NORDBERG MFG. CO

B r o o k H o u s e , P a rk L a n e , L o n d o n , W . l Te le ph o ne : M a y fa ir 3067/8 Te legram s: N o r d b e rg , A u d le y, Lon d on f^IHlNZF

O

S Y M O N S CONE C R US HE R S

T H E M IN IN G M AGAZINE

'ENGLISH ELECTRIC

' —

T H E ENGLISH ELECTRIC C O M P A N Y L IM IT E D

London Office: QUEEN'S HOUSE. K IN G S W A Y , L O N D O N . W .C .2

W O R K S : S T A F FO R D • PR E STO N • R U G B Y • B RAD FO R D • L IV E R P O O L

DIESEL ENGINES

FOR EVERY POW ER P U R P O S E

A medium-speed heavy-duty four-cycle engine. This ty p e o f Diesel engine is b u ilt in both n a tu ra lly aspirated and pressure-charged fo rm covering a range o f 165 B.H.P. to 660 B.H.P. at 600 R.P.M.

in 3 to 8 cylinders.

The engine illu s tra te d is an 8 c y lin d e r pressure-charged m odel developing 660 B.H.P. at 600 R.P.M.

Range o f* English E le c tr ic ’ Diesel Engines— 165 B .H .P . to 3,500 B .H .P .

I H E M IN IN G MAGAZINE

One of a number of Heavy Duty Sledgers being manufactured by Fraser and Chalmers.

F. and C. Heavy Duty Sledgers are d esign ed to crush run-of-mine ore, capacities 200/800 tons per hour. These are m assive m achines—equipped with automatic lubrication and water cooled bearings—

specially d esig n ed to m eet the dem and for large outputs required by mines and quarries.

FRASER & CHALMERS ENGINEERING WORKS

E F U T H . K E N T . L O N D O N O F F I C E : M A G N E T H C K iS E . K IN G S W A V

1 — 1

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T H E M IN IN G M AGAZINE

Made in sizes to crush fro m 20 to 200 tons an h o u r. •

W IT H A GYRASPHERE CRUSHER

If you could use a crusher th a t is capable of producing big tonnages of minus product, at really e x tra ­ ord in arily low operating and maintenance cost, you should w r ite us fo r particulars of the Pegson-Telsmith Gyrasphere, which is earning excellent profits for many o f th e forem ost undertakings in tw o hem i­

spheres. The large feed opening o f th e gyrasphere, combined w ith th e spherical crushing surface, gives you unobstructed and unlim ited choke feed. Th ere is continuous flow o f m aterial ov er th e spherical crushing head. A utom atic force feed lubrication is

given to efficiently sealed bearings, w h ilst cut steel drive gears, running in oil, give sm ooth, qu iet opera­

tio n. The manganese steel crushing members w ear evenly and assure th e m axim um nu m ber of crushing pinches at various angles o f th ru st. A djustm ents are all clear of th e crushing zone. Th e gyrasphere is th e finest equipm ent in its field. It gives you faster o u tp u t at very decidedly lo w e r cost. W r it e us if you are interested. Y o u r le tte r w ill bring you th e very fullest details of this im proved developm ent in m odern crushing equipm ent.

PEGSON LTD.

Iddesleigh House, Caxton S t., W estm in ster, London, S .W . I

W o rk s : C o a lv ille , Leicester.

P h one : A b b e y 2373

C ru sh in g C o sts

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T H E M IN IN G MAGAZINE

W O V E N W IR E S C R E E N S

Manufactured fro m specially toughened steel to resist abrasion and fra c tu re , “ H arco ” Screens last longer. Let us quote you fo r Screens th a t w ill reduce y o u r maintenance costs and give you increased o u tp u t w ith tro u b le -fre e service.

Catalogue M269 sent on request.

g a h a r v e y & C c .( lo n d o n ) L td .

WOOLWICH ROAD. LONDON S.E.7.

T H E M IN IN G M AGAZINE

R .E .A ./8 S

A 3

R E C E N T R O S S C R U S H I N G P L A N T S 900 T o n s p e r H o u r fo r —

A p p le b y -F ro d in g h a m S teel C o L t d . U n ite d S teel C o m p a n ies, L td . 200 T o n s p e r H o u r f o r —

T h e L a n c a s h ire S teel C o rp n ., L td . 4 0 0 T o n s p e r H o u r f o r —

T h e O xfo rd sh ire Iro n sto n e Co., L td .

j ^ L S specialists in crusher plan t equipm ent for th irty years, ROSS E N G IN E E R S

have been required to deal with difficult m aterials in every q u a rte r of the globe, and the point has now been reached where ROSS E N G IN E E R S can always show th a t economical handling of the m ost difficult and sticky m aterial is no longer a problem. The invariable experience of users of ROSS m ethods is th a t their sticky m aterial which defied any previous kind of mechanical handling, passes easily through ROSS Crusher P lants w ith factory-like precision. Those w ith Crusher P lan t troubles are urged to cease accepting these as ‘ p a rt of th e d ay ’s w o rk ’ and, instead, to eliminate this continuous inefficiency through substituting existing handling methods by ROSS m ethods. In this connection why not get the expert opinion of ROSS EN G IN E E R S on your crushing plan t and equipm ent ? I t would be worth your while to- do th is; you would be following the exam ple of m any who have benefited im m easurably by taking the advice of this Company who possess a knowledge of the subject th a t is unchallenged anywhere. ROSS E N G IN E E R S undertake all the work connected w ith Crushing P lants, from the initial studies of site and m aterial to the handing over of the p lant in operation. ROSS E N G IN E E R S design, supply, erect and, operate ; and ROSS Crushing P lan t E xperts, together w ith their Specialists in Concrete, Structural, and Electrical Engineering, have produced some of the w orld’s largest plants.

Wartime Address :

R O S S E N G IN E E R S L I M I T E D , 1 1 , W A L P O L E R O A D , S U R B IT O N , S U R R E Y . Telephone: Elmbridge 2345.

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T H E M IN IN G MAGAZINE

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 th e B T H C o m p a n y : A U S T R A L I A . S y d n e y :

A u stra lia n G e n e r a l E le ctric P ro p rie ta ry L td ., G . P . O . Box 2517.

M e lb o u rn e : A u s tra lia n G e n ­ e ra l E le c tric P ro p rie ta ry L td ., G . P . O . Box 5 3 8 -F .

N E W Z E A L A N D . W e llin g ­ ton : N a tio n a l E le ctric a l &

E n g in e erin g C o ., L td ., P .O . B ox 1055.

I N D I A . C a lc u tta : A sso c ia te d E le ctric a l Indus­

tries (In d ia) L t d ., P . O . Box 271.

B om bay : A sso c ia te d E le c ­ trical In d u strie s (In d ia ) L td ., P . O . B o x 4 8 4 .

C H I N A . S h an g h ai : Inniss &

R id d le (C h in a) L td ., 4 3 , Y u en M in g Y u e n R o a d .

H o n g K ong : Inniss & R id d le (C hina) L td ., 1st F lo o r D a v id H o u se , 6 7 - 6 9 , D e s V o e u x R o a d C e n tra l.

R H O D E S I A . B u la w a y o : Johnson & F le tc h e r L td ., P .O .

B ox 224. .

S O U T H A F R I C A . Jo h an n esbu rg : W ilso n & H e r d L td .. P . O . Box 7733.

C a p e to w n : W ilso n & H e r d , E n g in eerin g ( P ty .) , L td . P . O . Box 1459.

W E S T A F R I C A .

Seko n d i, G o ld C o ast C olony : T h e W e s t A fric a n E le ctric a l C o ., P . O . Box 8 .

K E N Y A . U G A N D A . T A N ­ G A N Y I K A .

N airo b i : R . G . V e rn o n & Co., P .O . Box 124.

N a iro b i : British E a s t A fric a C o rp o ratio n (1939) L td ., P . O . Box 182.

D a r-es-S a la a m : L e h m a n n ’s (A frica) L td . (for lam ps only), P .O . Box 163.

a n d o th e r s t h r o u g h o u t th e w o r ld .

B T H

^W 1 L L E S D E N

THE BRITISH THOMSON-HOUSTON COMPANY LIM ITED . W ILLESDEN. ENGLAND. A36I8

M E T A L - E N C L O S E D A I R - B R E A K

SWITCHGEAR

C L A S S AG1 U P T O 6 6 0 V O L T S A .C .

Out-of-balance current from core­

balance transform er blows a S T R IK E R - PIN FU SE,* which trips and locks out the sw itch. Sim ple and rapid replace­

ment of fuse.

C O M b f.

* Licensed under Patents Nos. 563060 and 563849.

T H E M IN IN G M AGAZINE

A TYPICAL CROSSLEY - PREMIER HORIZONTAL ENCLOSED

MULTI-CYLINDER DIESEL ENGINE Sizes up to 4,000 B.H.P.

CROSSLEY-PREMIER ENGINES LTD.

S A N D I A C R E , Nr . N O T T I N G H A M

T H E M IN IN G MAGAZINE

L E T O U R EXPER IEN C E H E L P Y O U

gT LTD

T R A FFO R D PA R K M A N C H ESTER 17.

Photograph bu The illu stra tio n sh o w s th e 1 2 5 0 /2 5 0 0 h .p.

Scotsman^" E le c tric S k ip W inding P la n t a t C o m rie C o l l i e r y , F i f e C o a l C o . , w h i c h u s e s M e tro v ic k E le c tric a l E q u ip m e n t.

T H E REID REPORT SAYS—

1Skip W inding should be much more w idely

T H E O N L Y T W O ELECTRIC C O A L SKIP W IN D E R S O PER A TIN G IN GREAT B R ITA IN UTILISE

METROVICK EQUIPMENT

C XM502

T H E M IN IN G M AGAZINE

* ) I 1 I

> v n >

THERMAL LINKAGE

SAVES LAUNDRY 237 . OF COAL BILL

L A U N D R Y ’S B IG E C O N O M Y

B E F O R E Thermal Linkage

— A laundry, in two sections ( with separate boiler plants), one each side o f a road, used 5,550 lb. o f steam p e r hour and consumed 41 tons o f coal weekly.

A F T E R Thermal Linkage The Laundry maintained the same output on a reduced coal consumption o f only 311 tons per week. Replacement o f a condemned boiler was also rendered unnecessary, saving

£ 6 ,000 o f new plant.

M E T H O D • One boiler equipped to supply a further 3,000 lbs. o f steam per hour, and coupled by a 6-in. steam main across street to steam range previously f e d by separate boiler plant. Steam-driven feed pump in sta lled ; exhaust returned to hot water tank. Turbine fan, exhausting to hot tank, added fo r supplying fo rced draught to boiler. H ot waste gases

I H o r e p l a n t s , o f a l l t y p e s , a c l o p t p r o v e d p r o d u c t i o n - e c o n o m y t e c h n i q u e

Therm al Linkage saves fuel. Therm al Linkage cuts production costs. Therm al Linkage increases output.

Those are the three proved reasons why progressive factories everywhere are adopting Therm al Linkage.

Therm al Linkage means integrating your various heat-using processes and, as far as possible, operating them as a single co-ordinated heat-using unit.

Instead o f being independently supplied to several separate points o f consum ption and the surplus going to waste, heat is circulated and re-circulated from point to point so long as there is w ork for it to do.

U R G E N T A C T IO N NEEDED

Fuel efficiency and im proved production will remain a pressing need. H ow m uch could your existing plant benefit from the application o f these prin­

ciples ? N o scheme o f reconstruction or plant conversion should commence w ithout Therm al Linkage being considered.

f o r g e n e r a l i n f o r m a t i o n

see Fuel Efficiency Bulletin N o. 21 (The C onstruction of a Factory H eat Balance).

f o r s p e c i f i c a d v i c e

and guidance contact your Regional Office o f the M inistry o f Fuel and Power.

from the locom otive boiler pu t through the redundant boiler, now used as hot water storage calorifier. Several further refine­

ments in steam-using plant carried out.

Incoming town water raised in tempera­

ture by 15°F. b y using dirty hot wash water in simple heat interchanger. For complete details see “ Fuel Efficiency News," December, 1945.

I S S U E D B Y T H E M I N I S T R Y OF FUEL

10

A N D P O W E R

T H E M IN IN G MAGAZINE

¿ U f U U l '

Is lie s t i l l a w orking m ach ine ?

N o !

The w e ig h t o f his body is to o great fo r his legs to w ithstand, body w e ig h t having increased d is p ro p o rtio n a te ly to bone stre n g th . Y o u r machines have often to w ith sta n d constantly magnified stresses. Make sure th e ir steel bones are stro n g enough by using Edgar A llen steel castings fo r the vital parts.

Edgar A lle n steel castings are made by th re e d iffe re n t processes, in ten d iffe re n t steels, and in w e ig h t fro m a few ounces up to 20 tons. The process is chosen to su it th e steel, and the steel is chosen to su it th e job.

i f W rite fo r the Edgar Allen Steel Foundry Book

A L L E N & CO, L IM IT E D .

IM PER IA L STEEL W O R K S:-SH EFFIELD .9

1 1

T H E M IN IN G M AGAZINE

1

■ L e t’s clear away th e old idea th a t its cost is excessive. T hat was re la tiv e ly tru e years ago when a m edium size b it hand-set w ith carbons cost a p p ro x i­

m ately £700. B ut now mechanically-set b o rtz bits cost ro u g h ly 1 /5 0 o f th a t sum. A lso th e y c u t much faster. This has resulted in a rapid advance in d r ill

design, w ith emphasis on high speed, pressure c o n tro ls and g re a te r p o w e r.

The c o m b in a tio n o f b o rtz bits and Longyear d rills g re a tly reduces y o u r in itia l in ve stm e n t and low ers th e cost per fo o t o f y o u r d rillin g . M odern core d rillin g is w e ll w ith in reach o f y o u r pocket book. C o n sid e r fo r exam ple—

The LONGYEAR Porta. H ere is a lig h t prospecting model at lo w cost. B o rtz bits are used, so th a t means a d d ition a l saving. C o m p le te , th e d r ill weighs 250 lb. and is easily carried by tw o men. This makes it ideal fo r shallow d rillin g fro m surface to depths o f 100 ft. recovering a § in. core. The P orta has an air-cooled p e tro l m o to r o f h.p.

The enclosed d rillin g head is a screw feed typ e pro d u cin g b it ro ta tin g speeds up to 1,250 r.p.m . The Longyear P orta is co n fid e n tly recom m ended fo r y o u r shallow core d r ill prospecting. W r ite fo r in fo rm a tio n .

(ANADIAN LONGYEAR, LIMITED, North Bay, Ontario, Canada

L O N D O N REPRESENTATIVE

A U S T I N H O Y A N D 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 s e n ta tiv e s in O s lo , N o r w a y ; H e ls in k i, F in la n d ; Johannesburg, S . A . ; P e rth ,

W e s te r n A u s t r a lia ; W e llin g to n , N e w Z e a la n d .

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T H E M IN IN G MAGAZINE

U N IF O R M IT Y

The constant uniform ity of Bear Brand Xanthates is one of the outstanding characteristics of these widely accepted flotation reagents.

Users know th a t any single drum or carload of drums can be depended upon to show the same quality as previous or subsequent shipments.

Z3— P o ta s s iu m E th y l X a n t h a t e Z4— S o d iu m E th y l X a n t h a t e Z 5 *— P o ta s s iu m A m y l X a n t h a t e Z 6 * — P o ta s s iu m P e n t a s o l A m y l X a n t h a t e Z8— P o ta s s iu m S e c o n d a r y B u ty l X a n t h a t e Z9— P o t a s s iu m I s o p r o p y l X a n t h a t e Z10— P o ta s s iu m H e x y l X a n t h a t e

* F r o m S h a r p i e s A m y l A l c o h o l

p io n e e r pro du cers o f X a n th a te s fo r m e ta llu rg ic a l use

C H E M I C A L S I N D I S P E N S A B L E T O I N D U S T R Y G R E A T W E S T E R N D I V I S I O N

THE D O W C H E M I C A L C O M P A N Y

S A N F R A N C ISC O C A L IF O R N IA , U. S . A .

T H E M IN IN G M AGAZINE

S M O O T H

P ro d u c tio n s m o o th as th e g lid in g c o n ta c t b e t w e e n iv o ry a n d g r e e n b a i z e d e p e n d s l a r g e l y u p o n th e e ffic ie n t lu b r ic a t io n o f p l a n t a n d m a c h in e r y . T E C A L E M IT A u t o m a t i c M e c h a n i c a l m e th o d s en s u re this effic ie n c y .

T h e R a d ia l Pum p illu s tr a te d is o n e o f a series d e s i g n e d to m e e t m ost o f the lu b r ic a t in g r e q u ir e m e n t s o f In dustry.

T e c a l e m i T

A U T O M A T I C M E C H A N I C A L L U B R I C A T I O N

TECALEMIT LIMITED, Great West Rd., Brentford, Middx.

Hydraulic S M echanical, Designing S Manufacturing Engineers

'P hone: EALing 6 6 6 1 (16 lines) t . i3b

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T H E M IN IN G MAGAZINE

Producer of the W o r ld ’s W idest Line of M ajor Industrial Equipment . . . over 1,600 Different Products th at Further Good Living !

ALLIS-C H ALM ER S M A N U F A C T U R IN G C O M P A N Y offer products of quality and in teg rity as the builders o f the w o rld ’s widest range of m ajor industrial equipm ent. For Allis-Chalmers builds complete power generation, distribution and control equipm ent— pumps— m otors— V -b e lt drives— crushing, cement and mining equipm ent— flo ur— milling, food and chemical processing equipm ent— in all, over 1,600 different products th at aid industry and fu rth e r good living ! Y o u r enquiries for information o r litera tu re w ill receive prom pt atten tion from —

O ne o f three 8 by 12-fo o t A llis - C h a lm ers R o d M ills perfo rm in g im p o rta n t ore-grinding operations in w o rld -fa m o u s iron ore concen­

tra tio n plant. A l lis - C h a lm e r s builds rod m ills in d ia m eters fro m 3 to 9& fe e t— in lengths fro m 1 to l l tim es the diam eter. R o d m ills are available in overflow, d ia ­ phragm , end, a n d centre peripheral discharge types. For correct eq u ip ­ m en t th a t m ea n s greater produc­

tion . . . better, fa ste r, cheaper, call on A llis -C h a lm e r s — w o rld ’s largest builder o f a ll ty p es o f g rin d ­ in g m ills.

ALLIS-CHALMERS

MANUFACTURING COMPANY,

T O T T O N , S O U T H A M P T O N

T e l e p h o n e : T O T T O N 8 1 4 6 1 .

T H E M IN IN G M AGAZINE

Jo r the purchase o f

ORES, CONCENTRATES

& MINING BYPRODUCTS

containing precious metals

73/83 HATTON GARDEN, LON DON, E.C.I.

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T H E M IN IN G MAGAZINE

H A It III \ t; I U I I I S

34 SIZES ACTUALLY INSTALLED AND IN USE f t. in. ft. in. f t in.

3X 8 6X 22 8 X 30

3 X 18 6X 36 8 X 36

3X 28 6X 48 8 X 48

4 * X 13 6X 54 8 X 54

X 16 6X 72 8 X 60

4* ^X 24 7X 22 8 X 72

4L X 36 7 X 36 10X 36

5X 22 7X 48 10X 48 5X 36 7X 54 10X 60 5X 48 7X 60 10X 72 6X 16 8X 22 10X 84 10X 96 Illustration shows an

8 f t. x 60 in. Hardinge M ill with oil-immersed gears : capacity 1000

tons a day.

Hardinge Mills are operating throughout the world, grinding a larger proportion of minerals than any other make of

m ill.

No fewer than 34 sizes are actually installed and in use, grinding felspar, ores, minerals and synthetic compounds.

Hardinge Mills are designed for wet or dry dustless grinding, the size o f the finished product ranging from

10 mesh to 95% — 10 M .U .

The Technical Staff of International Combustion Ltd. are always ready to bring their exceptional experience to any grinding problem.

1 ton a day to 1200 tons a day capacity

Sectional View

I N T E R N A T I O M L ® C O M B U S T I O N L ™

NINETEEN WOBURN PLACE, LONDON, W .C .I ci*

T H E M IN IN G M AGAZINE

G U A R D I A

o f

T H E P I T S

Because F E R O D O contributed to the British war effort the Lion ’s share o f all Friction Materials used on land, in the air and on and under the sea, the Lion has become symbolic

o f their products.

Always

F E R O D O Friction Linings provide great holding power and withstand arduous duty for long periods, thus obviating frequent renewals o f Winder and Haulage Brakes. T h ey cut costs and ensure safety, specify

E E R ® B ®

F R I C T I O N L I N I N G S

F E R O D O L I M I T E D . C H A P E L - E N - L E - F R I T H iREIlRlloTBBil

18

T H E M IN IN G MAGAZINE

S h o t-b la st h o se

This is just one of many hoses made by Dunlop

for all purposes. It has high abrasive resistance,

resists the action of oil and is not affected by heat.

O btainable from your usual factor o r wholesaler.

DUNLOP

D U N L O P R U B B E R C O . L T D .. G E N E R A L R U B B E R G O O D S D I V . , M A N C H E S T E R , I 46/GRG/I6A

T H E M IN IN G M AGAZINE

NISSEN

STAMP MILLS

T H IS im proved g ra vity stamp is made w ith falling weights o f 2,000 and 800 pounds, fo r norm al m ill and prospecting requirem ents respectively.

Designed and constructed by

HE AH. WRIGHTSON

& CO . LTD.

S T O C K T O N FORGE, S T O C K T O N -O N -T E E S

ORE

MINING

A N D

T R E A T M E N T P L A N T

U n d erground L oading S ta tio n s.

M ine S h aft G uides and S etts.

M ine Skips, C ages and S a fety H ooks.

M ine H ead fram es an d S h eaves.

M ine and M ill O re B in s and G ates.

M ill B u ild in g s and C h im n ey s.

Jaw C rushers and C ru sh in g R olls.

N issen S ta m p s and G rin d in g P an s.

A m a lg a m a tin g T ab les and B a rrels.

F ixed, R otary and S haking S creen s.

Selectro V ibrating S creen s.

B elt C onveyors and E levators.

Log and D ru m O re W ashers.

Ore and P u lp F eed ers and S a m p lers.

B all, Rod and T ube M ills.

Akins C lassifiers and D ew a terers.

T hickeners and D ia p h ra g m P u m p s.

A gitators and C on d ition ers.

P ach u ca and C yanide Tanks.

Z inc-D ust P recip ita tio n E q u ip m en t.

D ru m and D isc V acuum F ilters.

M orse-W einig F lo ta tio n E q u ip m en t.

Lowden and R u ggles-C oles D ry ers.

Skinner R oastin g F u rn aces.

HEAD, WEIGHTSON

& C o . L td .

STOCKTON F0R6T - STOCKTON-ON-TEES

20 26-W

T H E M IN IN G MAGAZINE

j- • ■ - ■

• 8 0 0 S e r i e s ' '

f W B f Ü S Î f J1S

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COM-

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oiidReagents^B i t i a U p p U c a t , o „ e

„ i d i c a t t v e f 1 ° flo la tio n w h e r e i n n o n - s n l p h e c o n o m i e » h s e le c tiv e r e a fC "aae6 are r e q u ir e d to

e f f e c t i v e P * o c e e r a l l i e s - treatlow-vahte>

C&Stttt GU« 5KH0S

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f e e d

CYANAMID PRODUCTS Ltd Berkhamsted, Herts.

1 — 3

T H E M IN IN G M AGAZINE

What Precipitation Process is " S T A N D A R D P R A C TIC E”

T h is machine has a w ide field o f application, from river dredging and catchment w ork to stripping of overburden.

J ib lengths : T h e se vary according to the task involved. A special w ide-outreach jib is supplied for river work.

S ta b ility : R ocking tendencies in ­ evitable with dragline w ork are counteracted by hook rollers and an am ple tail weight.

W id e tracks : L ig h t ground pressure is essential when w orking on soft yielding earth ; the cater­

pillars are designed for the p u r­

pose.

T H O M A S S M IT H & S O N S (R O D L E Y ) LTD ., R O D L E Y , LEEDS SPECIALISTS IN TH E DESIGN AND M ANUFACTURE OF CRANES AND EXCAVATO RS

Amongst Cyanide Operators

Used in cyanide mills throughout the world^—

★ CANADA ★ COID COAST ★ FIJI ISLANDS

★ r m iiF r iN is ★ s o u t h Af r ic a * k o m a

* AUSTRALASIA * tAFXKO * SOUTH A AURIC A

* UNITID STATES * CENTRAL AMERICA * EAST AFRICA

T h e M errill-C ro w e P ro cess and equipment is unexcelled fo r effecting maximum recovery o f g o ld and silver from cyanide solution at minimum cost o f operation . T h e staff o f thoroughly experienced M errill engineers p rovid e consultation services for your specific problem s. Investigate fully today. Litera­

ture, estimates and en gin eerin g service available on request.

MERRILL C ^ompany

5 8 2 M A R K E T S T R E E T

S A N F R A N C I S C O 4, C A L I F O R N I A

I N C A N A D A .3 0 2 BAY STREET, TORONTO, ONT.

SMITH ^{C H A * m a m} d £ x a u > a t ô iâ

22

T H E M IN IN G MAGAZINE

, F r a s e r & C h a lm e r s

WINDING PLANT

A G.E.C.-Fraser & Chalmers 1,350 h.p. direct current Ward-Leonard electric w inder in a South A frican mine.

M ining men in all lands kn o w th e outstanding efficiency and safety o f G.E.C.- Fraser & Chalm ers W in d in g Plant (steam and e le ctric). Countless m illio n s o f tons o f m inerals have been hauled by th e w ide va rie ty o f installations o f th is plant, many at ve ry deep pits and in vo lvin g heavy loads. Sim plified c o n tro l methods and w e ll tested safety devices have c o n trib u te d much to a tim e -p ro ve n re lia b ility .

Manufacturers

T H E G E N E R A L ELEC TR IC CO . LTD.

Head O ff ic e : M A G N E T H O U S E , K IN G S W A Y , L O N D O N , W .C . 2 Branches th ro ug hou t G reat Britain and in all principal markets of the w orld

T H E M IN IN G M AGAZINE

IN MODERN MINING^)

T he greater use of

EXPLOSIVES P O W E R )

can help to make good the gaps in man power.

We shall be pleased to give technical service and advice on all blasting problems.

IMPERIAL CHEMICAL INDUSTRIES LTD.

LONDON, S.W .l.

S E EKIN G R E C O V E R Y . .

. . . AND ^FINDING IT I

Given the Gold o r Tin in ample areas th ere is no cheaper o r m ore efficient method of recover­

ing it than by the Alluvial Dredge. It can go deep, it bites hard, it surfaces w ith full loads.

Its endless chain of buckets gives perpetually reliable service. It gathers, sifts and saves in its elaborate treatm e n t plant the precious metal deposits, disposing of the rejected m aterial just w here you wish it. Further interesting details w ill be readily made available to you.

ALLUVIAL DREDGES Ltd.

55/61 MOORGATE LONDON

TELEPHONE : M O N A R C H 5 I0 I MooLJLM A I

T A Y l Da? l E ° T pany L im ite<h R enfrew , Scotland T A Y LO R W H A R T O N Iro n and Steel Com pany, H igh Brid

N.J.. U.S.A.

Y U B A M anufacturing Com pany, San Francisco, U.S.A.

24

T H E M IN IN G MAGAZINE

In the years th at lie ahead, efficiency in Robey of Lincoln who have been making

| B ritain ’s mines, factories and workshops industrial plant for nearly a century w ill, w ill largely depend upon the design and by keeping th e ir manufactures up-to- q u a l i t y o f t h e

p l a n t a n d machinery used.

date, continue to contribute to in­

dustrial efficiency.

• - ..

R O B E Y

J U L » ^

*

mjniml w

R0BEY & CO LTD.UMCOLN, London O ffices: Commonwealth Bank Chambers.Old Jewry E.C.2.

T H E M IN IN G M AGAZINE

OUR OWN STEEL FOUNDRY

A Iso M akers o f

COMPLETE WHEELS AND AXLES

Q u ick D eliveries

HUDSON

M A D E I N

C A S T ST EEL W H E E L S

ROBERT HUDSON L td .

RALETRUX HOUSE

M E A D O W LANE

LEEDS

L O N D O N O F F IC E : 21, T o th ill S tre e t, S .W . I. 'P h o n e : W h ite h a ll 7127.

T 1

26

T H E M IN IN G MAGAZINE

T HOS. FI RTH t J O H N B R O W N LTD., SHEFFIELD

T H E M IN IN G M AGAZINE

F R O M B I R T L E Y T O B E R L I N

Wetded ta

(/ ic t c f a /

T h e v ic to r y ‘ l i n e - u p ’ a i B e r l i n

D aim ler Scout and A rm o u red C ars with Bodies, T urrets an d Chassis fab ricated by B IR T LE Y —

‘ Good enough f o r Churchill ’ played th eir full p a rt in securing V IC T O R Y and provide one exam ple o f the high-quality w orkm anship you can expect from the accum ulated skill an d experience now available to serve the requirem ents o f PE A C E .

< © >

HUB OF THE NORTH EAST

T H E B I R T L E Y C O. L I M I T E D B i r t l e y • Co. Du r h a m

______________________' __________________________________ B .IO O

Ropes fo r shipping ; ropes fo r m ining ; ropes fo r eng in e ering ; ropes fo r a g ric u ltu re ; ropes fo r fishing ; ropes fo r excavating ; ropes fo r tra n s p o rt. Ropes fo r every conceivable purpose fro m m ig h ty hawser to hum ble clothes line, including th e fittin g s and to o ls fo r th e ir m ost e ffic ie n t use.

This abridged lis t gives some idea o f the scope o f th e a c tiv itie s o f B ritish Ropes L im ite d . In addi­

tio n , we make tw in e s and cords, canvas and ta rpa u lin s and w ire o f all descriptions. It is safe t o say th a t w h a te ve r y o u r business, B ritish Ropes L im ite d can serve

B R I T I S H R O P E S LI MI TED

M A N U FA C TU R E R S OF W IR E ROPE, W IR E , HEMP C O R D A G E & C A N V A S

H e a d O ffice :

D O N C A S T E R E N G L A N D

28

T H E M INING MAGAZINE

Huntington,

Héberlein Coltd metallurgical consultants and contractors

L e f t : H e rre s h o ff

Roasting Furnaces

■ K \ \ \ | V

\

^{S \ L e f t :}

\ I X \ I V ^ V

MmA

IRfc 4 Sink and Float

■ y \ ¥ \ \ \ \ % ' V t S a G ra v ity M - V \ \ \ a * m. n S

M

C o n c e n tra tio n

BOlMaPneBt 'i c 'F' V M V Below +

S ep arators ^ S l D w ig h t Lloyd

S ep arators ■ » . « » W # S in tering Plants

114, C R O M W E L L R O A D , L O N D O N , S . W . 7.

T H E M IN IN G MAGAZINE

O f c o u r s e y o u d o n ’t h a v e to t a k e u s to o l i t e r a l l y , b u t w e a s s u r e o u r i n n u m e r a b l e f r ie n d s t h a t w e are p r e s s in g o n w ith t h e p r o d u c t i o n o f a ll t h e w e l l- k n o w n 46 A v o ” T e s tin g I n s t r u m e n t s w ith a v ie w to s p e e d in g u p d e liv e ry d a te s a s t i m e g o e s o n .

M e a n w h ile w e h a v e n o t n e g le c te d t o u s e t h e a d v a n c e s p e rfe c te d d u r i n g t h e w a r y e a r s , a n d th e s e v e r a l n e w I n s t r u m e n t s s c h e d u le d fo r e a r ly p r o d u c tio n w ill m e a s u r e u p to t h e t r a d i t i o n a l 44 A v o ” s t a n d a r d s o f a c c u r a c y a n d re lia b ility .

G c i t i n g D o w n

The 50-ra n g e M o d e l 7 U n iv e rs a l A vo M e te r is the le a d e r o f the w o rld -fa m e d ra n e e o f “ Avo ” E le c tric a l M e a s u rin g In s tru m e n ts w h ic h a re a p p re c ia te d fo r th e ir co m p act p o r ta b ility , d e p e n d a b ility , a nd a s te a d fa st a ccu ra cy w h ic h is o fte n used as a s ta n d a rd by w h ic h o th e r in s tru m e n ts a re ju d g e d . F ully d e s c rip tiv e p a m p h le t a v a ila b le on a p p lic a tio n . Sole P ro prieto rs and M a n u fa c tu re rs :—

A u t o m a t ic C o il W in d e r & E l e c t r i c a l E q u ip m e n t C o . L t d . , W in d e r H o u se , D o u g la s St., Lo n d o n , S .W . I ’Phone : V ic to ria 3 4 0 4 - 3

W rig h ts ' have been constructors o f the rig h t rope fo r th e job fo r a great nu m b er o f years.

F u r c h e r pa| p cu lars of Steel R op es fo r any p u r p o s e , o r advice on special c o n s tru c tio n s w ill b £ glad ly giv e n on ap p lica tio n to W r ig h t s ’ T e ch n ic a l D e p a rtm e n t.

W R I G H T S' R O P E S

L I M I T E D B I R M I N G H A M - 9

M A K E R S OF S TE F. L R O P E S . H E MP R O P E • C O R D A G E a T W I N E

30

T H E M INING MAGAZINE

M A T H E R & P L A T T LTD

L m d s L n ~ f y p e a n d ’ j ^ r f i o r i u a n c e

T H E M IN IN G MAGAZINE

— ]

SPECIALISED EQUIPMENT

FOR SUCCESSFUL ALLUVIAL DREDGING

For nearly 40 years Y U B A has specialised in th e design and c o n stru ctio n o f dredges fo r th e M in in g In d u s try . E xperience gained fro m th e o p e ra tio n o f Y U B A Dredges in th e m in in g fields o f th e w o rld is used by Y U B A ’S Engineering Staff w hen designing a new dredge o r re-designing an old dredge fo r d iffe re n t co n d itio n s . Every u n it is designed to best s u it the p ro p e rty to be dredged and th e gravel to be handled.

Bring y o u r dredging problem to e x p e rts in th e Y U B A O rganisa­

tio n and draw upon th e ir unequalled specialised experience w ith all types o f alluvial dredges.

vubr mnnuFHCiuRinc co.

351 C a lif o r n ia S t., S an F ra n c is c o , C a lif o r n ia

A G E N T S :

m t U V I R L DREDGES ITD.

5 5 - 6 1 M o o r g a t o , L o n d o n E. C. 2 C A B L E S —Yubom on

T em porary Address :— R enfrew , Scotland.

V " ^ROPE

DRIVES

FR A N K

WIGGLESWORTH ENGINEERS a co LTD'

SHI PLEY Y O R K S

, P h o n e : S H IP L E Y 16 6 6/7 /8

T E X R O P E D R IV E to “ Hardinge Ball M ill w ith _

air separation. G ram s : C L U T C H S H IP L E Y

Grinding and classifying coal 9 8 -6 % -1 0 0 mesh.

fo . R E L I A B I L I T Y

SPECIFY

W IGGLESWORTH — "TE XR O PE1' V ^DRIVES

32

T H E M IN IN G MAGAZINE

¿P* ^{a ï} Û

K O E B E L IT E D I A B O R

IMPREGNATED

A N D O THER TYPES

CRAELIUS C O M PA N Y , Ltd.

12, CLARGES STREET, L O N D O N , W . I

T E L E P H O N E : G R O S V E N O R 1 3 7 8 9 T E L E G R A M S : C R A E L IU S , L O N D O N

A g e n t s f o r

T H E S W E D IS H D I A M O N D R O C K D R IL L IN G C O M P A N Y

T H E M IN IN G M AGAZINE

S T A N D A R D D U M P Y L E V E L

C A M B E R W E L L , L O N D O N , S . E . 5

E ST D. 1857.

B U I L D E R S O F E U R O P E ’ S L A R G E S T E X C A V A T O R S

A LL SIZES i to 11 Cu. Yd.

IN C L U D IN G

W A L K I N G D R A G L I N E S

C 9 Q 2 S Q I 5360 9 cu. yard Electric Stripping Shovel

RANSO M ES & RAPIER, LTD ., IP S W IC H • L O N D O N • E N G L A N D

34

T H E M IN IN G MAGAZINE

T o the left is shown a 3-W Diesel Walking Dragline with 90 foot boom and 2 J yard bucket. In the background is a 24-RB Diesel Dragline. Both are stripping coal on an opencast working.

R U S T O N - B U C Y R U S L T D . , L I N C O L N

E x c a v a t o r S p e c i a l i s t s

T H E M IN IN G M AGAZINE

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

N o . 3 0 8 6

, # I t B D l ^

i he Mining Magazine

P u b l i s h e d on the 1 5th o f each m o n th a t S a l i s b u r y H o u s e , L o n d o n , E .C . 2, for M i n i n g P u b l i c a t i o n s , L t d .

Editor : F . H ig h a m , A .R .S .M ., M .S c ., A sso c.In st.M .M .

M anager: 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 eleph o n e : M O N a r c h 9 4 16 . T eleg ra p h ic A ddress : O ligoclase. Codes : M c N e ill, both E dition s, & B e n tle y.

Br a n c h Of f i c e N e w Y o rk : A m er. In st. M . & M . E . Su b s c r i p t i o n/ ! ?sc P e r annum , including postage.

I U . S .A ., $ 3 p e r a n n u m , in c lu d in g p o sta g e .

Vol. L X X V . No. 1. L O N D O N , J U L Y , 1946.

P R I C E O N E S H I L L I N G

C 0 N T

P A G E

Ed i t o r i a l

N otes ... 2

Canadian Mining Taxation ; Metal Mining in Great Britain ; Revised Metal Prices ; Birthday Honours ; Mining in Southern Rhodesia.

B ritish Coal R eserv es... 3

A recent Fuel Research Survey Paper is reviewed.

E m pire M ineral R esources... 4

Attention is called to discussions at the recent Empire Scientific Conference.

Mo n t h l y Re v i e w... 5 Di v i d e n d s De c l a r e d ... 8 Ar t i c l e s

In d u strial Training

J . B . Richardson 9 A summary of its war-time use, of its development and

aims, and a brief review of its application to metal mining.

G ravim eter Test in a B ritish Oilfield 21

An account of a recent demonstration of the use of the Norgaard instrument.

%

P recipitation of Gold by th e Merrill-

Crowe P r o c e s s

J . G. V ivian 26

Some operating hints.

Or e- Dr e s s i n g No t e s ... 29 War-Time Progress ; Home-Made Clarifier ; Unblocking a

Jam m ed Crusher; Chance Sand Flotation ; A New Technique ?

En g i n e e r i n g Lo g... 32 Ne w s Le t t e r s

Johannesburg ... 35

St. Helena Flotation ; Union’s Coal Industry ; Chrysotile Asbestos ; Miners Strike.

V a n c o u v e r ... 38

Mine Labour ; Slccan ; Nelson ; BeaverdeU : Omineca • Atlin ; Portland C anal; Cariboo; Albemi : Nanaimo; Lillooet.

1

— 4

E N T S

Toronto

Gold Production.

Melbourne

... 42 Mining at Yam pi Sound ; King Island Scheelite ; Western

Australian Gold Production ; Victorian Gold Pro­

duction ; Control of Coal Mining ; Coal at Blair Atholl ; Victorian Brown Coal ; Aluminium in Australia.

Pe r s o n a l ... 4 4 Tr a d e Pa r a g r a p h s ... 4 5 Jo h n so n M a tth e y E x h ib itio n ... 46 Me t a l Ma r k e t s ... 4 7 St a t i s t i c s o f Pr o d u c t i o n ... 4 9 Pr i c e s o f Ch e m i c a l s... 51 Sh a r e Qu o t a t i o n s... 52 Mi n i n g Di g e s t

U n ited S ta te s B a ry te s

C. L . H arness and F . M . B arsigian 53 G old Fineness in P o rtu g u ese E a s t A frica

L . L . Colin 56 G eophysical P ro sp ectin g . . . . H . Lundherg 59 E lectro m eta llu rg y in E a s te rn C anada

W . M . Goodwin 60 O re Changes in D e p t h . E . L . Bruce 62 C o n cen tratio n of U-235 R . R. W isner 63 C hrom ite A ssociations . . . . T. P . Thayer 64 B.C. M ineral I n d u s try ... H . Sargent 65 Oregon B a u x i t e ... F . W . Libbey et al 66 R e c e n t P a t e n t s P u b l i s h e d ... 66 N e w B o o k s , P a m p h l e t s , e t c ... 66 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 67

EDITORIAL

A D E P L E T IO N allowance of 50% for ta x purposes on all operating mines, in Canada, together w ith exem ption from corporation ta x for new mines for a three- year period, are th e recom m endations of the Senate Com m ittee on N atu ral Resources which has been studying th e economic value of th e m ining in d u stry in th e Dominion.

I T has been common knowledge for some tim e th a t th e Governm ent intends to set up a com m ittee of inquiry into the m etalliferous mining industry in this country.

M atters were advanced a stage fu rth er on Ju ly 9 when, in answer to a question in the House of Commons, it was sta te d on behalf of th e M inister of Fuel and Power th a t Lord W estwood h ad accepted an in vitation to act as chairm an and th a t th e M inister hoped shortly to announce th e full constitution of th e com m ittee and its term s of reference.

Lord Westwood, who hails from N orthum ­ berland, has a long experience of industrial and labour questions.

F U R T H E R rises in th e prices of three base m etals were announced last m onth by th e M inistry of Supply effective J u ly 1 . It will be recalled th a t as recently as April last changes were m ade in th e prices then ruling for copper, lead, zinc, and zinc products. In the Control of Non-Ferrous Metals (No. 24) Order, 1946, the m axim um prices are respectively increased as follows : Copper by £12 per ton ; copper rods by

£12 10 s. ; lead by £10 ; zinc by £10 ; zinc sheets by £ 10 , and zinc oxide by

£8 10s. On this occasion th e M inistry have stated their reasons for th e adjustm ents as being m ade " in order to bring th e selling prices of copper, lead, and zinc in th e U.K.

more closely into line w ith current purchase costs.” Additional rem arks by our Metal M arkets’ correspondent will be found else­

where in this issue.

I N the B irthday Honours list published last m onth appear a num ber of nam es of interest to mining men. K nighthoods are aw arded to Dr. W. T. Griffiths, chairm an and m anaging director of th e Mond Nickel Co., L td., to Dr. C. C. Paterson, D irector of the Research L aboratories of th e General Electric Ct|., L td., and to Mr. A. J. G. Sm out, a

director of Im perial Chemical In d u stries, L td., and a Member of Council of th e In s titu ­ tion of Mining and M etallurgy. Among aw ards in In d ia are th e C.S.I. to Mr. J . B.

H arrison, D ep u ty Coal Commissioner an d Chief Mining Engineer, R ailw ay B oard, and th e C .I.E. to Mr. H . Crookshank, S uper­

intending Geologist, Geological Survey of India. In th e Dominions and Colonies lists the O.B.E. goes to Mr. B. Lightfoot, D irector of th e Geological Survey of S outhern Rhodesia, and Mr. F. B. Higgins, Chief Inspector of Mines, Gold Coast, while Mr.

N. A. Middlemas, D irector of Surveys, L an d Officer, and Commissioner of Mines, U ganda, receives th e C.M.G. A nother recipient of th e O.B.E. is Mr. H. E. Fern, chairm an of Mining Publications, L td ., who has been associated w ith

Th e Mi n i n g Ma g a z i n e

since its inception in 1909.

S P E A K IN G a t th e annual m eeting of the Cham ber of Mines of R hodesia held in Bulaw ayo recently Mr. B. W. D urham , th e president, suggested th a t th e G overnm ent mining settlem ent scheme for ex-Service men would unquestionably play an im p o rtan t p a rt in arresting th e decline in th e Colony’s m ining industry. Mr. D u rh am said of 94 m ines being re-opened under th e scheme it appeared th a t production was certain on 29, probable on 29, an d possible on 33.

Only three mines h ad been abandoned after exploratory work. The results were, con­

sidered extrem ely satisfacto ry a n d th e prospects distin ctly encouraging, p a rti­

cularly as nearly all th e ex-Service men placed under th e scheme h a d show n th e m ­ selves enthusiastic, energetic, and capable.

W ith regard to th e position of th e in d u stry th e president suggested th a t progress would be retarded, especially in respect of the introduction of capital for opening u p new ventures of any size, u n til th e G overnm ent policy in regard to ta x a tio n an d o th er m a tte rs had been clearly and definitely outlined, so th a t investors and operating companies m ight know w here th e y stood.

If th e new G overnm ent g ran ted th e relief th a t th e position dem anded he h a d no fear for th e gold-m ining in d u stry and was con­

fident th a t oth er large m ines would come

into production to replace those w hich by

th e n a tu re of m ining were approaching th e ir

end.