The Mining Magazine, Vol. 75, No. 6

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1 h e M î n i n g w l a g a z m e

VOL. L X X V . No.

6

. LO NDO N, DECEM BER, 1946. ONEPSH?LLING

H A R D I N l i b ■ Ml I I S

Sectional View

34 SIZES ACTUALLY INSTALLED AND IN USE

1 ton a day to 1200 tons a day capacity

H ardinge M ills are operating th ro u g h o u t th e w orld, grinding a larger proportion o f m inerals th a n any other make o f mill.

N o fewer th a n 34 sizes are actually installed and in use, grinding felspar, ores, m inerals and synthetic com pounds.

H ardinge M ills are designed for w et o r dry dustless grinding, th e size o f the finished pro d u ct ranging from 10 m esh to 9 5 % — 10 M .U .

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

ft in. ft. in. ft. in.

3X 8 6X 22 8X 30

3X 18 6X 36 8X 36

3X 28 6X 48 8X 48

44^X ¹³ ⁶^X ⁵⁴ ⁸^X ⁵⁴

44^X ¹⁶ ⁶^X ⁷² ⁸^X ⁶⁰

44^X ²⁴ ⁷^X ²² ⁸^X ⁷²

44^X ³⁶ ⁷^X ³⁶ ¹⁰^X ³⁶

5X 22 7X 48 10X 43

5X 36 7X 54 10X 60

5X 48 7X 60 10X 72

6X 16 8X 22 10X 84

10X 96

INTERNATIONAL Ü ) COMBUSTION LT_D

NINETEEN WOBURN PLACE, LONDON, W.C.I

^{C 2 2}

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T H E M I N I N G M A G A Z I N E

T h ere’s certainly no hot air about this ( j ) C om pressor in the vitally important com pression stages . . . the two stage system

and efficient intercooler ensure that no p o w er-red u cin g tem peratures are built up.

This intercooler, se rv e d b y a high-efficiency fan, en ab les air to b e d eliv ered to the high p ressu re cylinder only a few d e g r e e s above the intake temperature . . . and the final disch arge

is approximately 200° F. low er than from a sin gle stage machine at 100 pounds p ressu re.

AIR COM PRESSORS ■ PNEUMATIC TOOLS ■ ELECTRIC TOOLS ■ DIESEL ENGINES ■ VACUUM

PUMPS • C O N TR A C TO R S’ EQUIPMENT • ROCK DRILLS • DIAMOND DRILLS • OIL W ELL TOOLS

CP 14

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T h is H e a v y M edia S ep a ra tio n p ro cess w ill tr e a t o res o f : IR O N , ZINC, S IL V E R -L E A D , M A G N E SIT E , F L U O R S P A R , T IN , G A R N E T ,

E t c ., E tc .

M a n y m illio n to n s o f o r e , m e ta llic a n d n o n - m e ta llic , a r e a t p r e s e n t b e in g t r e a t e d b y th is p ro c e ss.

B y a r r a n g e m e n t w ith C y a n a m id P ro d u c ts , L t d ., a P ilo t T e s t U n i t is a v a ila b le a t o u r w o rk s , th e te s t re s u lts f r o m w h ic h c a n r e a d ily b e c o n v e r te d in to a fu ll s c a le p l a n t d e s ig n .

T h e t r e a t m e n t o f p r o d u c ts f ro m H e a v y M e d ia S e p a r a t i o n c a n , i f n e c e s s a ry , b e f o llo w e d b y f r o th f lo ta tio n , c y a n id a tio n , o r b y o th e r o r e d re ssin g m e th o d s .

O u r w o r ld w id e e x p e r ie n c e in th e t r e a t m e n t o f o r e is a t y o u r d isp o s a l.

F R A SER & C H A L M E R S ENGINEERING WORKS

Proprietors : The General Electric Co. Ltd.

ERITH , KEN T.

l o n d o n o f f i c e : m a g n e t h o u s e , k i n g s w a y

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T H E M I N I N G M A G A Z IN E

M . S .3 e/R

ANSWERED ALREADY

I t o fte n h a p p e n s t h a t o u r a d v ic e is s o u g h t o n q u e s tio n s t h a t h a v e b e e n a n s w e re d in a d v a n c e , a n d w e h a v e o n ly t o s e n d o u r e n q u ir e r o n e o f th e n u m e ro u s te c h n ic a l p u b lic a tio n s w h ic h w e h a v e issu e d d u rin g th e p a s t fifte en y e a rs. O f c o u rs e , m a n y o th e r p ro b le m s n e v e r re a c h u s b e c a u s e o u r p u b lic a tio n s a re a lr e a d y a t h a n d . Y o u to o c a n h a v e th e a n s w e r o n y o u r sh elv es.

THE M O N D NICKEL C O M PANY LTD

GR OSVENOR HO USE PARK LAN E L O N D O N W1

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Harco

WOVEN WIRE SCREENS

Manufactured from specially toughened steel to resist abrasion and fracture, “ H a rco ” Screens last longer. Let us quote you for Screens that will reduce your maintenance costs and give you increased output with trouble-free service.

Catalogue M269 sent on request.

GA II ARVE Y & Co ( l o n d o n ) L td .

WOOLWICH ROAD, LONDON S.E.7.

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‘R U B B E R N E W S ’

F R O M THE B . T . R . —S I L V E R T O W N G R O U P

M ANUFACTURERS O F TYRES ■ HOSE ■ BELTING ■ LINING S MOULDINGS ■ CO VERING S

B T R - S t l v c r t o w n ||

SERVICE TO INDUSTRY II

Transport

W hether you travel by road, rail, sea or air, B .T.R . - Silvertown - Palm er products make valuable contributions to comfort, safety and speed.

O n c a r s , b u s e s , lo r r ie s a n d b i c y c l e s , B . T . R . G i l t - e d g e d and Palm er tyres are obvious examples. Less noticeable are the B .T .R . fan and dynamo belts, radiator connections and body components (such as rubber engine m ount- A ings) which have done so S m uch to im- / prove the mod-

~3 ern vehicle.

For railways, the Silvertown Com pany provides prim ary b att

eries to operate signals, hose which is a vital c o m p o n e n t o f t h e W estinghouse brake system and train-lighting belts.

On aircraft, Palm er equipm ent has made “ happy landings ” for more than thirty years ; at sea, every ship contains ru b b er and ebonite products— including m any d e v e l o p e d i n t h e t e n f a c tories o f the

B.T.R./Silver

town Group.

T ru ly , trans

p o rt depends on rubber!

THE B .T .R .- SILVERTOWN GROUP

British Tyre & Rubber Co. L td .; The India Rubber, Gutta Percha & Telegraph Works Co. L td .; The Palmer Tyre Ltd.

HE RGA HOUSE, V I N C E N T SQUARE, L O N D O N , S . W. l

6

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F o r H a u l a g e in

MINES £

QUARRIES

All round operation is th e k e y n o te of th e R u s to n O il En g in e d Loco. Under the most arduous conditions the

Ruston machine has proved its ability to give satisfaction, whether it be on the surface or for underground use, for narrow or standard gauges.

The Loco is made entirely by Ruston— there being no divided responsibility.

A sk fo r d e s c rip tiv e C a ta lo g u e.

FLAM EPR O O F MINE L O C O

All gauges 1 ft. 6 in. to 3ft. 6 in.

I . C . E . a p p ro v a l N o . I o f the B r itis h M in e s D e p t.

RUSTON OIL ENGINED LOCOS

R U S T O N & H O R N S B Y L T D . L I N C O L N

A sso cia ted w ith D A V E Y . P A X M A N & CO.. L T D .. C O L C H E S T E R

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BsM' OIL ENGINE

DRIVEN COMPRESSORS

IN S T A L L E D B Y M A N Y M IN IN G C O M P A N IE S T O E N S U R E A C O N T I N U O U S A N D E C O N O M IC A L

S U P P L Y O F C O M P R E S S E D A IR

“ B & M ” oil engine driven air compressor.

Other manufactures Steam Engines.

Steam Turbines.

Condensing Plants.

Turbo Compressors.

“ Area " Regulators.

Pneumatic Hose Couplings.

BELLISS & MORCOM L

B IR M IN G H A M 16, E N G L A N D

8

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; ctric WINDING y EQUIPMENT

A .C . E Q U IP M E N T at a S C O T T IS H C O L L IE R Y

Designed fo r winding 305 long tons per hour from a depth o f 1,845 ft.

M o to r : 1.950/3.900 H .P.

423 r.p.m. 6.600 volts.

C o n tro l : Reversing Contactors

Liquid C o n tro lle r

W A R D -L E O N A R D E Q U IP M E N T

S O U T H A F R IC A N G O L D M IN E Designed fo r winding 225 short tonsr per hour from a depth of 6.000 ft.

M o to r: 2.938/7.345 H P.

200 r.p.m.

Flywheel M otor G en e ra to r Set w ith B T H com m utator type

slip regulator.

B T H

B T H p r o d u c ts in clu d e a ll h in d s o f ele ctric p la n t fo r service A B O V E or B E L O W G R O U N D

R U G B Y

T H E B R I T I S H T H O M S O N - H O U S T O N C O M P A N Y L I M I T E D . R U G B Y , E N G L A N D .

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 . S y d n e y :

A u stra lia n G e n e ra 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 . B ox 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.

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

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

H o n g K ong : Inniss & R id d le (C h in a) 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.

I N D I A . C a lc u tta :

A sso ciated E le ctric a l Indus

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

B om bay : A sso c ia te d E le c trical In d u stries (In d ia ) L td ., P . O . B o x 4 84.

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 o x 224.

S O U T H A F R I C A . Jo h an n esb u 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 .

S ekondi, G o ld C oast C o lon y : 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 a i r o b i : R . G . V e rn o n & C o..

P .O . B ox 124.

N a i r o b i : B ritish E a s t A fric a C o rp o ratio n (1939) L td .. P . O . B ox 182.

D a r-es-S a la a m : L e h m a n n s (A frica) L td . (for lam p s 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 .

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, o t

u n f a il in g s w

s o

W rite for particulars of Blackstone horizontal and vertical oil engines.

' ■ W t

Æ ?A'

'k jÉ S

sgm

BLACKSTONE AND CO LTD S T A M F O R D ENGLAND

10

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y M etrovickX

f th ru sto rs l [operating main' 1 and au x iliary i t b ra k e s (M«h a i

^ h h a n d w h e e l c u t a u i a y M

t o s h o w I

f h r . l t f n r \ I

A A 1X5 h p \ M e tr o v ic k 1 m o t o r d r i v i n g , a m a n - r id in g j h a u la g e Ak

Increased safety with consequent increased output is assured in this Beckett & Anderson

man-riding haulage, through automatic

control by main and auxiliary brakes. Each brake is operated by a F L A M E P R O O F electro-hydraulic thrustor which applies the necessary pressure smoothly, rapidly and w ith full reliability.

The main driving motor is a M etrovick 125 h.p., 2,200 v.[type F W machine. It is a Slipring Induction motor with totally- enclosed fan-cooled enclosure certified as fully F LA M EP R O O F .

ELECTRICAL ~ ^ CO.. LTD .

T R A F F O R D P A R K - M A N C H E S T E R 17

11 ^J/M602

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THOS FIRTH ^t JOHN BRO W N LTD S H E F F I E L D

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BEAR

SAN FRANCISCO S e a ttle

Y ears of ex trem e ly div ersified o p e r ating e x p e rie n c e hav e conclusively d em o n stra ted that optim um e co nom ic an d m etallurgical results a re a ch iev e d b y the use of Bear Brand Xanthates.

Time an d e x p e rie n c e h av e d em o n stra te d the u n iv ersal adaptability of th ese outstanding re a g e n ts to the successful flotation treatm ent of p ractically all su lp h id e ores, as w ell as som e o xydized o re s an d certain o re s containing native metal.

E xtrem es in climatic conditions do not a d v erse ly affect the quality and usefulness of B ear B rand Xanthates.

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 IC A L C O M P A N Y

C A LIFO RN IA Los Angeles

p i o n e e r p r o d u c e r s o f X a n t h a t e s f o r m e t a l l u r g i c a l use

DOW

C H E M IC A L S IN D IS P E N S A B L E TO IN D U S T R Y A N D A G R IC U L T U R E

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THERMAL LINKAGE

GUTS BOTTLE WASHING FUEL COSTS BY 50%

In m any plants the heat in spent process liquors which was form erly w asted is now being success

fully recovered, thus effecting substantial savings o f fuel.

The simplicity o f the m ethod o f recovering waste heat is show n by the experience o f a firm w ith a bottle-w ashing plan t requiring a supply o f w ater a t 140°F.

Originally the h o t w ater was o btained by passing m ains w ater through a calorifier where it was heated by a steam supply. B oth the condensate from the steam and the h o t dirty w ater were allowed to run to waste. (See D iagram

“ Before.”)

The first step was to replace the steam supply

to the calorifier by a closed circuit h o t w ater supply, thus returning the cooler w ater to the boiler and reducing considerably the fuel re

quirem ents.

Next, filtering arrangem ents were installed fo r the water leaving the w ashing m achines. This dirty w ater was passed th rough a settling tan k and finally afilter,th eclean w aterb ein g p u m p ed b ac k th rough the calorifier into the tan k feeding the w ashing machines. (See D iagram “ A fter.” ) T he sm all a m o u n t o f m ake-up w ater required was negligible and it was found possible to m aintain a tem perature a t the calorifier inlet o f 100°F.

R esults : Fuel requirem ents reduced by 50% . W ater wastage elim inated.

r^-r^---1---- 1---- 1

m a in s

UPPLY 1---j ^ ---1

TO WASTE -HOT D / R T V W A T E R

T R A P TO W A S T E

f~ ^ * I I I W ASHIN C MACHINE

|

makeup r m

PUT WASTE HEAT TO WORK IN YOUR PLANT

H ave you investigated the econom ies you could effect in y our plan t by applying the principles o f T herm al Linkage ? I f you are undertaking a reconstruction o r plan t conversion scheme see th at T herm al Linkage is fully considered. In your own interests you should go in to the m atter now.

Substantial savings may be possible fo r a relatively trifling capital outlay. F o r general inform ation see F uel Efficiency Bulletin N o. 21 (The C onstruction o f a F a cto ry H e at Balance). F o r specific advice c onsult in your R egion the Office o f the M inistry o f Fuel and Power.

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

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T H E M I N IN G M A G A Z IN E

Producer of the W o rld ’s W id est Line of Major Industrial Equipment . . . over 1,600 Different Products that Further Good Living !

G ia n t ore crushers like th is 54 -inch A llis -C h a lm e r s Sup erio r M e C u lly G yra to ry s p e e d - u p p r im a ry a n d secondary reduction o f ores a ll over the world. T hese crushers have greater feed area a n d considerably greater ca p a city th a n conventional jau> typ e crushers, are low in o perat

ing a n d m a in ten a n ce cost. A v a ila b le in both p rim a ry a n d fine reduction ty p es in sizes fro m 2 to 60-inch receiving openings.

A LLIS - C H A LM E R 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 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 equipment— 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 ! Y ou r enquiries for information o r literature will receive prompt attention from—

ALLIS-CHALMERS

MANUFACTURING COM PANY,

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 3161/2.

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ISIS |WW U9A* 0 f ^ H g s * a n i » . -

I N V E S T I G A T I O N ■ E Q U I P M E N T » S E R V I C E sHiBr xssg' ¿k %i: .. . ■< ^■■ ■*:' swsls ass W

E N G I N E E R S

A B F O R D H O U S E , W I L T O N R O A D , L O N D O N , S . W . I 16

S E T T L IN G C L A R IF Y IN G F IL T E R IN G

I N V E S T I G A T I O N

E Q U I P M E N T

Careful testwork for which our laboratory has been specially developed enables the most suit

able type of equipment to be installed at a minimum cost. Adequate testwork and sound machine design— these are two factors which we recognise as supremely important — and the third, equally essential :—

SERVI CE : — by Engineers with long specialised e x p e rie n ce .

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i / A group of mines carried out extensive tests under normal

conditions w ith d rill steels of th e same com position made by tw o large m anufacturers, one of w hom was Edgar A llen & C o. Lim ited.

T he tests w e re extended o v e r tw o months to obtain decisive results.

Stag Brand mining drill steel gave an average of k in. per drill g reater penetration than the o th e r steel of identical com position.

★ S T A G M I M I N G D R I L L S T E E L S

(solid o r hollow in all the usual standard sections)

are made by Edgar Allen & Co. Limited, by the metal core process, with its admitted advantages.

To Edgar Allen & Co., Limited.

Imperial Steel W orks, Sheffield, 9.

Please post your

M IN IN G D R ILL STEEL B O O K to

M.M.

ED G A R ALLEÏV & CO, LIM ITED.

IM P E R IA L S T E E L W O R K S :- S H E F F IE L D .9

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"| " H E plant illustrated is Installed in the Essendon Pumping Station of the Barnet D istrict Gas and W a t e r Company, and comprises an Allen combined two-stage borehole pump and a five-stage force pump, driven through bevel speed increasing gears by an Allen 4-cylinder engine, having a 12-hour rating of 200 b.h.p. at 300 r.p.m.

O w ing to shortage of staff to carry out normal maintenance this engine completed a 50 W E E K S ’ N O N - S T O P R U N from 24th February, 1945, to the 10th February, 1946, and was at w o rk again after a short interval for decarbonising and the usual routine inspection, which revealed negligible w ear and no necessity for replacements.

W e are indebted to the Directors of the Barnet District Gas and W a t e r Company for permission to use this information.

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DUNLOP

D U N L O P Face belts delivering to G ate belt at the M anchester C o llie ry C o m p an y's W o rk in g s

D U N L O P R U B B E R CO. LTD.. G E N E R A L R U BBE R G O O D S D IVISIO N. C A M BR ID G E STREET, M A N C H ESTER London : Clerkenw ell House, Clerkenw ell Green E .C .I. Birm ingham : Dunlop House, Livery Street, 3.

L iverp o o l: 24 Cornhill, Park Lane, I. Glasgow : 48-60 and 70-78, N o rth W allace St., C.4.

46/GRG/27A

-2 19

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C H I M E S

Up to 250,000 gallons

per hour

Pegson-Marlow portable pumps are made in sizes to deliver in almost any hourly capacity from 1,500 gallons per hour. They combine the ad

vantages of centrifugal pumping w ith the ability to prime themselves dependably.

There is no 20 per cent, loss through re

circulation. Pegson-Marlow pumps will

handle w ater containing up to 25 per cent, of solids. They keep going efficiently delivering th e ir rated capacity w here other types have failed. W e claim that they w ill d eliver more w ater than any comparable pump. W it h a Pegson-Marlow

portable pump you are in a position to move w ater quicker and at less expense. W r it e now for facts and figures which prove these claims to the full.

Ask any questions you like about these—

the simplest, most efficient pumps on the market.

P EG SO N Ltd.

Iddesleigh House, Caxton St., W estm inster, London, S .W . I.

Phone : A b b ey 2373.

W o r k s : C o a lv ille , Leicestersh ire.

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\ j j j a p i f m i m T

. . . have been executed by parts of the w orld ; their s is at your disposal.

CONTRACTORS FOR

• Diamond Core Drilling

• Blast Hole Drilling

• Cement Injection

• W a te r Drilling

• Geophysical Surveys

.

^-> .7

the Craelius Company in all ecialised technical experience

SUPPLIERS OF . . .

• Diamond Core Drilling Equipment

• Diamond Bits

• Hard Metal Bits

• Pressure Grouting Equipment

• Percussion Rigs

• Bore-hole Pumps

• Geophysical Survey Equipment

Craelius

CRAELIUS COMPANY LTD., 12,

Telephone : Grosvenor 1378/9.

IGES STREET, LONDON, W. 1

Telegrams : Craelius, London.

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6 b Various Drill Models— Longyear core drills are manufactured in a variety of sizes and capacities for either surface or underground drilling. For surface work, drills are mounted on a steel frame and usually powered by petrol or Diesel engines. Capacities range from 100 ft. to 8,500 ft. for the largest

model. Underground models are

mounted on either single or double columns for setting up in drifts or raises.

They are either air or electrically driven. Selection may be made from a number of models ranging in capacity from 100 ft. to 900 ft.

These are all fast, fully powered drills of modern design. Prices are definitely within your reach.

The L O N G Y E A R Prospector—

For Shallow Drilling from Surface

If your job calls for 300-ft. holes, the petrol-driven Prospector is recommended for your purpose. It is light, compact, mounted on a steel frame and easily moved in the field. W ith o u t the drilling head the drill can be carried by two men or it can be “ knocked down ” in a few minutes. You will find it useful in sinking standpipe, fishtailing, or core drilling to moderate depths.

There is a spool hoist and a 3-speed transmission.

High bit speeds permit the use of bortz bits which reduce drilling costs. W rite for further information.

CANADIAN LONGYEAR, LIM ITED, North Bay, Ontario, Canada

L O N D O N R E P R E S E N T A T IV E

AU STIN H O Y AND C O M P A N Y, L IM IT E D , 39, St. James Place, S.W . I

O th e r rep resen tatives in O slo , N o r w a y ; H e ls in k i, Finland ; Johannesburg, S .A . ; P e rth , W e s te r n A u s tr a lia ; W e llin g to n , N e w Z ealan d .

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The illustration shows an installa

tion of 4-54 in.

high-weir A kin s Classifiers in South Africa.

'Akins CLASSIFIERS'"

These machines, operating in America, Africa, Australia, Spain, and other countries, have given such superior performance that mill managements throughout the mining world are turning to Akins Classifiers for economic classification. In large or small plants the Akins ensures reduction in operating costs, increased tonnage, and improved classification. Send for our Catalogue and examine some of the evidence for yourself.

WE A LS O M A N U FA C TU R E NISSEN STAM P MILLS, BALL AND TUBE MILLS, DRYERS, ETC.

H EA D , W RIG H TSO N eC?L™

S T O C K T O N F O R G E , ST O C K T O N - O N -T EES

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■]!

::

|f 2

£ C2 m

S t P A U L 'S C A T H E D R A L 6V S/A C H RISTO PH ER M E * FOUNDATION STONE LA ID I S I S COMPLETED IN TH E YEAR 1710

I e c a l e m i Y

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

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 r s

GREAT WEST RD., BRENTFORD, MIDDLESEX P H O N E : E A L IN G 6661 (16 lines)

I n t h e fie ld o t A r c h i t e c t u r e S t. P a u l s w a s

u n d o u b t e d l y V i r e n s M a s t e r p i e c e

I n t h e E n g i n e e r i n g f ie ld o f t o d a y t h 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 i c a l P u m p — o n e o f a s e r i e s

d e s ig n e d t o m e e t a l l t h e l u b r i c a t i n g r e q u i r e =

m e n t s o f i n d u s t r y — c a n j u s t i f i a b l y b e d e s i g n a t e d ,

i n i t s o w n s p h e r e , a M a s t e r p i e c e o f e n g i n e e r i n g

i n g e n u i t y a n d c r a f t s m a n s h i p .

24 -4

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REDUCE t h o s e c r

I W COSTS. . .

Next time you mstal a se c o n d ary Æ ^ h p ,

machine that will give you a l o n g X T f (r k? ° Ut for ^ Economy in maintenance c o s t s / L d ! r * Service-

and premature w e ar— these rÆnts breakdow ns

Of hard cash as the ton-years Be on the safe side and spe reduction of all hard materia withstand severe punishmeni a reputation for keeping ha

6— 4

juouim 25

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‘ ' ( /

4 Ÿ 0 M

D o yo u k n o w w hat Birtley can d o ? They have the m en a n d the facilities fo r fabrication o f all kinds; sheet metal and plate work of every description; precision-machined small parts and com

ponents; plastics moulds and machinery manufacture; design and manufacture o f complete coal cleaning and materials handling plant. Ample capacity for weldings and fabrication. F o r sm all jo b s o r big jo b s (to y o u r design o r to o u r design) send y o u r enquiries to B IR T L E Y .

T H E B I R T L E Y C O M P A N Y L I M I T E D • B I R T L E Y • C O . D U R H A M 1 06

m/s

IT BEARS THE HALL-MARK O F HIGH-CLASS MATERIALS AND G O O D WORKMANSHIP.

N A T I O N A L GAS A ND OIL E N G I N E CQ. LT D

A S H T O N - U N D E R - L Y N E L A N C A S H I R E

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DREDGES BY YUBA

Y U B A ’S entire engineering staff and plant facilities are now available for the design and construction of alluvial mining dredges. Backed by almost 40 years’ continuous field and manufacturing experience, the Y U B A organization provides a full consulting service in design, construction and maintenance of alluvial dredges.

If you have an alluvial dredging problem— C O N S U L T Y U B A — w rite for detailed information. O ur service is at your disposal.

v u b r mnnuFncTURinc to.

351 C a lif o rn ia St., San Francisco, C a lifo rn ia A G E N T S :

n i l U U I f l l DREDGES I TD.

5 5-6 1 M o o r g a t o , L o n d o n E. C. 2

Temporary Address :— Renfrew, Scotland.

EPEk d ib ilii

ROPEWAYS

62, L O N D O N W A L L

LIMITED

FOUNDED 139/

T elep h o n e N o. : C lerkenw ell 1 4 4 2 /3 .

L O N D O N , E .C .2

T e le g ra m s : R o p ew a y s, L o n d o n .

1 8 9 1 - 1 9 4 6

W e have completed

55 ^YEARS

Unbroken Experience and Progress in all Systems of

AERIAL ROPEWAYS

V I E W O F M O N O C A B L E R O P E W A Y I N B O L I V I A L E N G T H — 8 ,o o o m e tre s

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A S T R A IG H T F O R W A R D E N G IN E E R IN G J O B !

F o r fu ll d e ta ils of A n d r e ru b b e r b o n d e d -to -m e ta l. p le a se re q u e s t o u r c o m p r e h e n s i v e t r e a t i s e ,

“ E l a s t o m e r i c E n g i n e e r i n g , ” g la d ly su p p lie d to re s p o n sib le e x e c u tiv e s .

T h r e e A c r e s o f S p e c ia lis e d R u b b e r T e c h n o lo g y

TAS/AR39

29

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Denver “ Sub A ” Flotation cells possess the correct fundamental principles so essential for high recovery and production of best grade con

centrate. Because of th e ir reliability and adaptation to all kinds of flotation problems, over 20,000 Denver “ Sub A ” machines are in use throughout the world, treating metallic and non-metallic minerals as well as reclaiming wheat, rubber and waste paper.

W rite for flotation Catalogue F.l I. B.

¿ttíU íci i t i ¿ 'tictuL i /ta fip ć cz. A&UtAi&t. eu tcícu ea itíU vi'

D E N V E R E Q U I P M E N T C O . , L T D .

S A L I S B U R Y H O U S E • L O N D O N , E C 2 , E N G L A N D

■ D E N V E R 1 7 . C O L O R A D O : P. O. Boi 5 2 1 1 T ORON T O. ONTA RI O 45 Ricbnond Strict W. L 0 N 0 0N . EC2. E N E LA N D : Salisbury H o i s t

■ NEW YORK CITY 1. N T : 4114 Eiipln Stiti Rltft V ANCO UVE R. I C : 305 Crodit Fiicier Bldf. J OH AN NE SB UR G, 1 A FR I C A : I Yillife Road Belicoso 1 : 1123 Bell Bldf., 307 N. M i c l i m MEXICO. 0 F.: Edificio Pedro di Santo. Soote 7 RI CHMOND. A USTRAL I A: 530 Victoria Stroet

3

G O L D S IL V E R C O P P E R C O A L

F L U O R S P A R T U N G S T E N

WORTHINGTON-SIMPSON AIR COMPRESSORS

High Lift Centrifugal Pumps, Vacuum Pumps, Boiler Feed

Pumps, Surface Condensing

Plants, etc., etc.

Send your Enquiries t o :

W O R T H I N G T O N - S I M P S O N , LTD., HlMrfllll

N E W A R K - O N - T R E N T

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This w in d e r is in o p e ra tio n in Bestwood Associated Collieries, near Nottingham . Many sim ilar in stal

lations are giving satisfaction in various parts of the w o rld .

A d v t. o f T h e G en era l E le c t r ic C o . L t d ., M a g n e t H o u se, K in g s w a y , London, W .C . 2 .

31

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H i e ^ r j D A V I E S M A G A I T W O R K S I

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 489.

S A N D E R S O N E R O S

fr N E W B O D L D L ™

NEW HALL ROAD SH EFFIEL D

Makers of Quality Steels and Tools since 1776

For continuity of output and econom y in production cost, specify " C O L O R A D O ” when next ordering mining steel or tools.

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A rc w e ld e d s te e l construction is finding in crea sin g application in m od ern structural and civil e n g in e e r in g w ork s . . . W e ld e d s te e l p r o v id e s m axim um stren gth , rigidity and resista n ce to corrosion . . . W e ld e d d e s ig n for bu ilt-u p m em b ers r e d u c e s fabrication costs . . . W e ld e d rigid joints m ean sh allow g ir d e r s and m o re c e ilin g h eigh t, sle n d e r colum ns and m ore floor a rea . . . W e ld e d roofs g iv e clea r u ninterrupted s p a c e s and g rea ter useful h eigh t. Structural m em b ers can b e built up to any d e s ir e d sh a p e b y arc w e ld in g . S p ecial req u irem en ts m ay b e m et in the m ost efficient m anner.

Illustration (1): W e ld e d tw o -h in g e d arch fram e b u ild in g in co u rse of erectio n . Span 107 ft., H eight 37 ft., Length of b u ild in g 600 ft. Illustration (2): Sun b a lco n ies 35 ft. in d iam eter su p p o rted on w e ld e d can tilev ers.

Q uasi-A rc S e rv ice is at your d isp o sa l for e x p e r ie n c e d practical a d v ic e on the application of arc w e ld in g to structural ste e lw o r k .

R P I I I 9 C

33

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HUDSON <AST STeEL _WHEELS

M A D E I N

O U R OW N STEEL FO U N D R Y

A Iso M akers o f

COMPLETE WHEELS AND AXLES

Q uick 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 tre e t, S . W . I. ’P h o n e : W h ite h a ll 7127.

WINDERS OF ALL SIZES

W IT H D R U M S U P T O 14' 0" D IA 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

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P R O D U C T S OF

" R . O . S T O K E S A C o ., L t d . 7 THE HALKYN JIG

18 in. x 96 in. Halkyn Jig with 3-Compartment Tray.

The Halkyn Jig has been developed as an advance on most mineral jigs where moderately coarse ¿in . to 1£in. material is being treated for a mineral concentrate. A low water con

sumption has been secured and floor space for a given capacity is a minimum. The material is conveyed over the moving screen by a positive variable forward movement every stroke.

R. O. STOKES & CO. LTD.

Mechanical and Metallurgical Engineers

538/540, S A L IS B U R Y H O U SE, LO N D O N , E.C.2

Telephone : MANsion House 1611. Telegrams : Rostoke, Phone, London.

Cables : Rostoke, London.

35

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K . & B .

ACCESSORY FLOTATION EQUIPMENT

1. Conditioners.

2. W et R eagent Feeders.

3. Dry R eagent Feeders.

4. R eagent Emulsifiers.

K N A P P 6 BATES LIM ITED

10, GATE STREET, KINGSWAY, LONDON, W.C. 2

T elep h o n e : CHA 6770. C ab les : FLOWSHEET, LONDON.

5360 9 cu. yard Electric Stripping Shovel

R A N S O M E S & R A P IE R , LTD., IP S W IC H • L O N D O N • E N G L A N D

3 6

B U I L D E R S

A L L SIZES I to 11 Cu. Yd.

INCLUDING

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

t z u m ï M

—

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

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Photograph by c o u rtesy o f B r itish 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 fine balances and Weights have been made in London fo r ju st on 100 years. M ay we send you our latest specifications?

37

T A S /O R /2 4 4

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T H E M I N IN G M A G A Z I N E

Ropes for shipping ; ropes for mining ; ropes for engineering ; ropes for agriculture ; ropes for fishing ; ropes for excavating ; ropes for transport. Ropes for ever/ 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 M I T E D

M A N U F A C T U R E R S O F W IR E ROPE, W IR E , H EM P C O R D A G E & C A N V A S

H ea d O ffice :

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

38

1887 ^...

T H E C Y A N I D E P R O C E S S WAS F I R S T USED

FOR GOLD E X T R A C T I O N

and, after n e a r l y 60 years, like

" Cassel B r a n d " H ig h G ra de Sodium C y a n i d e it is still u n s u r

passed as the m ean s of r e c o v e r in g g o ld from refracto ry ores.

“ CASSEL” BRAND

CYANIDE

I M P E R I A L C H E M I C A L I N D U S T R I E S L I M I T E D

L O N D O N , S . W .l

M G II7

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I N I G H T

year in and year out Robey plants are giving reliable service

This is the direct result of the enterprise and initiative exercised by Robey of Lincoln throughout many years experience in the manufacture o f :—

D IE S E L E N G IN E S S T EA M E N G IN E S

B O IL E R S

M IN IN G P L A N T

R O A D A N D Q U A R R Y P L A N T A IR C O M P R E S S O R S

F IB R E M A C H IN E R Y C A S T IN G S O F A L L S IZ E S

R OB E Y E- CO LTD LINCOLN

Lo n d o n O ffice Commonwealth Bank Chambers 10, Old J e w r y E.C .2 .

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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

L I M E K I L N S . E Q U I P P E D W I T H

5 5 " x 36" 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 B

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The Mining Magazine

Pu b l i s h e d on the 1 5 th o f each m o n th at Sa l i s b u r y Ho u s e, Lo n d o n, E .C . 2, fo r Mi n i n g Pu b l i c a t i o n s, Lt d.

E d ito r : F . H i g 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 . Chairm an : H . E. F e r n , O .B .E ., J . P . T e le p h o n e : M O M arch 9416- T e le g r a p h ic A d d re s s : Oligoclase. C o d es : M c N e ill, b o th E d itio n s , & B e n tle y . B r a n c h O ffic e , N ew Y o rk : A m er. In s t. M . & M .E . S u b s c rip tio n

{

ï î ~ Çer a n n u m , in c lu d in g p o stag e.

t U .S .A ., §3 per annum , including postage.

Vol. L X X V . No. 6. L O N D O N , D E C E M B E R , 1946.

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

c o

Ed i t o r i a l

N o tes ...

S ubscription Price of th e Magazine ; Coal N ationaliza

tion ; “ W orld L ist of Scientific P erio d icals” ; Colonial Mining P o lic y ; E lectro n Ju b ile e ; Mining Costs ; P resident-E lect of th e In stitu tio n of Mining an d M etallurgy.

R eco v ery in M a l a y a ...

Review of a rece n t Mines D ep artm en t M emorandum.

C opper S up p lies ...

Tw o rece n t statem e n ts on copper supplies are discussed.

Mo n t h l y Re v i e w ... ...

Ne w Co m p a n i e s Re g i s t e r e d...

Di v i d e n d s De c l a r e d...

Me t a l Pr i c e s ...

Ar t i c l e s

W a r-T im e In v e n tio n s

S. T. Madeley

A review of th e w ork facing th e Royal Commission on A wards to Inventors.

C olom bian S u rv e y . . . . N . W . Wilson

(Concluded fro m the November issue, p . 292.)

M iner’s Anaemia

W . Schweisheimer

A discussion of th e incidence an d prevention of hook

w orm diseases.

T h e T h re e -P o in t P ro b lem

E . A . Eveleigh-Smith

A solution less tedious th a n others in common use.

Or e Dr e s s i n g No t e s...

B reaking Coal to Size ; F lo tatio n Cell Design s Screens vs. C lassifiers; T he Plug Cock.

En g i n e e r i n g Lo g ...

Ne w s Le t t e r s

R e d ru th ...

S hortage of L ab o u r ; S outh C rofty ; E a st P o o l; B asset Mine D um ps ; C astle-an-D inas ; New Consols.

6-5

N T E N T S

\

p a g e p a g e

V a n c o u v e r... 370 o i q Canadian Institute Western Meeting ; Atlin ; Portland Canal; Skeena; Albemi ; Victoria; Clinton;

Quesnel; Omineca ; Osoyoos ; Greenwood ; Slocan ; Golden ; Yukon Territory.

T o ro n to ... 373 Gold Production ; Porcupine ; Kirkland Lake ; North- , Western Ontario ; Manitoba ; Quebec.

4 M elbourne ... 374 Aberfoyle Tin ; Broken Hill South ; Zinc Corporation ;

“J 4 4 North Broken Hill ; Mining at Tennant Creek;

Deborah Gold Mine.

OAr. P e r s o n a l ... 3 7 7 3 4 5

„ Tr a d e Pa r a g r a p h s ... 3 7 8 G .E .C . I n d u c tio n M o to r ... 378 3 4 8 B a s tia n a n d A llen E le c tric B o ile rs... 378

2^ M o n ro M u le d o z e r ... 379 F a c to r y L ig h tin g . . ... 380 H a d fie ld s M a n g a n e se -S te e l W h e e ls... 381 N e lso n E le c tric -A rc S tu d W e l d i n g ... 382

3 4 9 M e t a l M a r k e t s ... 3 8 3 St a t i s t i c s o f Pr o d u c t i o n ... 3 8 5 Pr i c e s o f Ch e m i c a l s... 3 8 7 Sh a r e Qu o t a t i o n s ... 3 8 8 M i n i n g D i g e s t

3 5 7 O ra n g e F re e S ta te G o ld . . . . A . F ro st et al. 389 C o n c re te S h a f t L in in g s . . E . G . P . R a y n e r 391 D ra g C lassifiers in t h e B r ita n n ia M ill

W . G. H a tc h 394 3 5 9 O p e n - P it C o p p e r fro m N e w M exico

L . A . L u th e r 396 D u s t fro m L e y n e r D rills

3 6 0 r j C ra ig a n d T . M . W a te rla n d 399 B la s tin g S w itc h e s

M . S . P eterson a n d F . E . C ash 401

3 6 4 R e c e n t P a t e n t s P u b l i s h e d ... 4 0 2 Ne w Bo o k s, Pa m p h l e t s, e t c... 4 0 2

3 6 7 S e l e c t e d I n d e x

t o Cu r r e n t Li t e r a t u r e 4 0 3 341

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EDITORIAL

F

O R som e tim e p a s t th e cost of p ro d u c in g T h e M i n i n g M a g a z i n e h a s b ee n s te a d ily risin g a n d , as re a d e rs w ill p ro b a b ly b e aw are, p r in tin g o p e ra tiv e s re c e n tly se cu red a n a d d itio n a l w age in c re ase a n d re d u c e d w o rk in g h o u rs. I n con seq u en ce th e p ro p rie to rs now find i t n ec essary to ta k e a s te p long co n sid ered b u t p re v io u sly a v o id e d — t h a t is, to raise th e su b sc rip tio n ra te . W ith th e J a n u a r y issue, th e re fo re , th is is to b e in c re a se d fro m 12s. to 16s., p o s t free to a n y p a r t of th e w orld, w hile th e new p rice p e r co p y is to b e Is. 6d.

R

E P L Y I N G to a q u e stio n in th e H o u se of C om m ons la s t m o n th th e M in ister of F u e l a n d P ow er, Mr. S hinw ell, a n n o u n c e d t h a t th e p rim a ry v e s tin g d a te for th e tr a n s ference of th e coal m ines to n a tio n a l ow ner

sh ip w o u ld b e J a n u a r y 1 n e x t.

A

C T IV E p re p a ra tio n s a re being m ad e, it is a n n o u n c ed , for th e issue of a th ir d e d itio n of th e “ W o rld L is t of S cientific P erio d ic als T h e la s t e d itio n of th is w ork, issu ed in 1934 a n d cov erin g th e y e a rs 1900-1933, is now o u t of p r in t. L ib ra ria n s are b ein g ask ed to c o -o p e ra te b y sen d in g p a rtic u la rs to : T h e S e c re ta ry , W o rld L ist of S cientific P erio d icals, c /o T h e Zoological S o cie ty of L o n d o n , R e g e n t’s P a rk , L on d o n , N .W . 8, fro m w h ich office f u rth e r in fo rm a tio n m a y b e o b ta in e d .

A

S we go to press d e ta ils h a v e becom e a v a ila b le re g a rd in g a M em o ran d u m on C olonial M ining P o lic y issu ed b y th e C olonial Office. I t is h o p e d to m a k e f u rth e r referen ce to th is m a tte r in a s u b se q u e n t issue ; here i t m u s t suffice to s a y t h a t th e p rin cip les ex p re ssed in th e M e m o ra n d u m seem to be fra m e d to en su re t h a t local G o v ern m e n ts receive m a x im u m b en efit fro m m in e rals o cc u rrin g w ith in th e ir te rrito rie s, w ith o u t d isreg a rd in g th e n ec e ssity for efficient e x p lo ita tio n of u n its of econom ic size.

E

L E C T R O N IC S is beco m in g an e v e ry d a y w o rd in a p p lie d science th e se d ay s, w hen m e a su rin g devices u sin g electro n ic c o n tro l are finding th e ir p lace in cou n tless processes. D u rin g th e w a r th e d e v e lo p m e n t

of th e science h a s b ee n re m a rk a b le a n d th e m o re n o ta b le since it is n o t y e t 50 y e a rs ago t h a t th e elec tro n w as d isc o v ered b y S ir Jo se p h T ho m so n . N e x t y e a r, h o w ev e r, will see th e 5 0 th a n n iv e rs a ry of th is fa r- re a c h in g d isc o v e ry a n d to m a rk th e ju b ilee , a n d to d e m o n s tra te th e tre m e n d o u s influence su c h a n a d v a n c e in p u re p h y sic s m a y h a v e on th e life of th e c o m m u n ity , th e I n s titu t e of P h y sic s a n d th e P h y sic a l S o c ie ty a re jo in tly a rra n g in g a series of m e e tin g s a n d o th e r fu n c tio n s to ta k e p la c e o n S e p te m b e r 25 a n d 26, 1947, in L o n d o n . A sp e cia l e x h ib itio n , w h ich is to re m a in o pen to th e p u b lic for s e v e ra l w eeks, w ill b e h e ld a t th e S cience M useum , S o u th K e n sin g to n , a n d w ill show th e d e v e lo p m e n t of th e v a s t ra n g e of m o d e rn in d u s tria l e q u ip m e n t from its e a rlie s t e x p e ri

m e n ta l origins.

S

P E A K IN G a t th e re c e n t a n n u a l m e etin g of th e C o n so lid ated G old F ield s of S o u th A frica, th e c h a irm a n , Mr. R o b e rt A n n a n , to o k n o te of th e effect of risin g la b o u r co sts on th e R a n d , w here, h e sa id , la b o u r now ab s o rb e d a b o u t 3 5 % o f th e v a lu e of th e p r o d u c t— t h a t is, a b o u t d o u b le th e av e rag e r a tio for m a n u fa c tu rin g in d u s try . W hile, h e said , d ire c t co m p a riso n w ith o th e r m in in g fields h a d to b e m a d e w ith c a u tio n i t w as re m a rk a b le h ow little v a ria tio n th e re w as in th is ra tio , irre sp e c tiv e of lo c a lity o r of th e ty p e of la b o u r em p lo y ed . M a n u fa c tu rin g in d u s try w as h ig h ly m e ch a n iz e d , th e raw m a te ria l bein g b ro u g h t to th e f a c to ry a n d a n asse m b ly lin e f re q u e n tly b rin g in g th e w o rk to th e w o rk e r. In m in in g , how ever, c o n d itio n s w ere, M r. A n n a n sa id , ju s t th e rev e rse . T h e ra w m a te ria l la y f a r u n d e r

g ro u n d , m e n a n d m a te r ia l h a d to b e tr a n s p o rte d long d ista n c e s to th e w o rk in g places th r o u g h o p en in g s m a d e for th e p u rp o se a n d m a c h in e ry h a d c o n s ta n tly to be m o v e d to k eep u p w ith th e w o rk in g face as it r e tr e a te d . T h e re w as, in co n seq u en ce, a lim it to th e a m o u n t of m e c h a n iz a tio n w hich w as eco n o m ically p ossible. H e th o u g h t it sh o u ld b e w id ely rea lize d t h a t m e c h a n iz a tio n w as n o t a cu re -a ll a n d t h a t m in in g , w h a te v e r th e p ro d u c t, m u s t alw a y s d ep e n d on m a n u a l la b o u r to a fa r g r e a te r deg ree th a n w a s th e case w ith m a n y o th e r fo rm s of in d u s try . I n m in in g co sts th e o u tp u t p e r m a n -sh ift w as th e v ita l fa c to r.

342

(43)

D E C E M B E R , 1946 343

A

1 th e m e e tin g of th e I n s titu tio n of M ining a n d M e tallu rg y la s t m o n th it w as a n n o u n c e d t h a t P ro fesso r W . R . Jo n e s h a d b een elec ted p re sid e n t for th e 1947-8 session. D r. Jo n e s, w ho occupies th e U n iv e rsity of L o n d o n C h air in M ining G eology a t th e Im p e ria l College of Science a n d T echn o lo g y , is th e D ean of th e R o y a l School of M ines a n d a v ic e-p re sid e n t of th e M ineralogical S ociety. T ra in e d a t th e R o y a l College of Science a n d th e R o y a l School of M ines h e w as for th e th re e y e a rs en d e d 1915 Chief A s s is ta n t G eologist to th e F e d e ra te d M alay S ta te s a n d th e S tra its S e ttle m e n ts.

In th e p e rio d of a c u te w o lfra m sh o rta g e in th e 1914-18 w a r he w as m a n a g in g d ire c to r in B u rm a of th e H ig h S p eed A lloys M ining C om pany, a c o m b in a tio n of 26 of th e chief B ritish ste e l m a n u fa c tu re rs fo rm ed to p u rch a se a n d o p e ra te w o lfram m ines. F ro m 1920 to 1926 h e w as en g ag ed in c o n su ltin g p ra c tic e a n d v isite d m in in g fields in v ario u s p a r ts of th e w orld. I p 1926, how ever, he rejo in ed th e geological sta ff of th e R o y a l School of M ines a n d w as la te r a p p o in te d to th e C h air he now occupies, follow ing th e r e tire m e n t of P ro fesso r C. G. Cullis. P rofessor Jo n e s is th e a u th o r of “ T infields of th e W o rld ” a n d n u m e ro u s o th e r scientific p u b li

ca tio n s a n d w ill long b e rem e m b e re d for his research es in to th e m in e ra l c o n te n t of silicotic lungs. H e is a d v ise r to th e B o a rd of T ra d e on c e rta in m in in g in d u strie s, c h a irm a n of th e C hina-C lay W o rk in g P a r ty , a n d a m e m b er of th e M inerals D ev e lo p m e n t C o m m ittee re c e n tly a p p o in te d b y th e M in istry of F u el a n d Pow er.

R ecovery in Malaya

P rogress to w a rd s th e r e h a b ilita tio n of th e g re a t in d u strie s of M alay a— ru b b e r a n d tin — is being a n x io u sly s tu d ie d in th is c o u n try . In a w o rld p a in fu lly reco v erin g from a d e v a s ta tin g w a r B rita in , sh o rn of m o st of h e r foreign in v e stm e n ts, sacrificed no less to th e A llied cause th a n to h er ow n, b a d ly needs A m eric an c u rre n c y to p ro v id e th e m e an s for h e r ow n re su sc ita tio n . I n th is connexion M a lay a can p ro v id e r a p id h elp w hile a c tin g as a “ d o lla r fa c to ry ” , I t is th u s im p e ra tiv e t h a t ev e ry m e an s be p ro v id ed , as far as is possible, to a id M alay an rec o v ery a n d re p o rts e m a n a tin g from th e F a r E a s t c o n tin u e to be w a tc h e d for evidence t h a t th e sw ing b a c k to

p re -w a r v irility re m a in s u n h a m p e re d . In a re c e n t issue of T i n 1 a m e m o ra n d u m on th e w ork of th e M alay an Mines D e p a rtm e n t b y M r. A. B ean , Chief In sp e c to r of M ines, is rev iew ed a n d som e of th e evidence of progress m a d e in rev iv in g th e tin in d u s try it p re se n ts m ig h t w ell be considered here.

I t is a p p a re n t in th e lig h t of th is m e m o ra n d u m t h a t th e tin -m in in g in d u s try of M a lay a w as in a d ep lo ra b le co n d itio n a t th e tim e of lib e ratio n . M achinery, in clu d in g dredges, o p e ra te d b y th e J a p a n e s e h a d been ru n to a s ta n d s till a n d m u c h of th e rem a in d e r d e s tro y e d o r looted, w hile m a n y Chinese m ines re m a in e d flooded d u rin g th e e n tire o cc u p atio n . B y th e e n d of 1945, it is sta te d , o n ly 45 C hinese m ines a n d no E u ro p e a n com p an ies w ere o p era tin g . W hen th e Civil G o v ern m e n t resu m e d c o n tro l in A pril, 1946, th e se figures h a d been in c re ase d to 63 C hinese m ines a n d 10 E u ro p e a n a n d been fu rth e r im p ro v e d to 144 a n d 22 resp e ctiv ely b y J u n e 30 la st. A ccording to figures issued b y th e S ta tis tic a l Office of th e In te rn a tio n a l T in R esearch a n d D ev e lo p m e n t Council th e n u m b e r of dredges a t w ork on S ep te m b er 30 h a d risen to 14, w ith 24 being re h a b ilita te d , a n d a to ta l of 181 m ines w ere a t w ork, th e 3,052 to n s of tin in ore p ro d u ce d in th e six m o n th s from J a n u a r y to J u n e bein g m a tc h e d b y 2,378 to n s for th e S ep te m b er q u a rte r.

In sp ite of th is g re a tly im p ro v e d position th e Chief In s p e c to r’s m e m o ran d u m show s th a t g re a t difficulties h av e still to be o v e r

com e, th e m a in fac to rs im peding m ore ra p id progress being th e h ig h cost of m a teria ls, food, a n d wages th a t resu lts from a g en e ral sh o rta g e of supplies. I t is p le a sa n t to n o te , how ever, t h a t essen tial p a r ts are now rea ch in g M alaya in g re a te r vo lu m e a n d th a t in fu tu re th e re will be less call on th e Ja p a n e se d u m p s now u n d e r th e c o n tro l of th e C u sto d ian s of E n e m y P ro p e rty , a lth o u g h th e se h a v e p ro v e d of in e stim ab le v alu e in re s ta rtin g b o th E u ro p e a n a n d Chinese p ro p ertie s. I t is com forting, indeed, th a t in th e view of Mr. B ean, p ro sp ec ts for th e re su m p tio n of p ro d u c tio n are b rig h te n in g a n d it is e v id e n t t h a t th e Mines D e p a rtm e n t, forced to u n d e rta k e a g re a t deal of w ork a d d itio n a l to its n o rm a l d u tie s, h as p la y ed no sm a ll p a r t in en gineering th e rec o v ery m a d e to d a te . I t can be n o te d , for in stan ce, t h a t th e D e p a rtm e n t ac ts as te ch n ic a l ad v isers to th e C hinese T in Mines L oans C om m ittee, w hich is assistin g m a n y o p e ra to rs

1 N ovem ber, 1946.